Android——多功能记事本（Android Studio）

一，功能

拍照
添加画板
录音
书写转文字
添加图片

1，主页面

2，功能

二，实现

贴代码：

1，AndroidManifest.xml文件（添加权限）

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.llw.notes"><uses-sdkandroid:minSdkVersion="14"android:targetSdkVersion="21" /><uses-permission android:name="android.permission.CAMERA" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.RECORD_AUDIO" /><uses-feature android:name="android.hardware.camera" /><uses-featureandroid:name="android.hardware.camera.autofocus"android:required="false" /><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:requestLegacyExternalStorage="true"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/Theme.AppCompat.Light"><activityandroid:name=".ShowRecord"android:exported="true" ></activity><activityandroid:name=".ShowPicture"android:exported="true"></activity><activityandroid:name=".HandWriteActivity"android:exported="true" /><activityandroid:name=".ActivityRecord"android:exported="true" /><activityandroid:name=".PaintActivity"android:exported="true" /><activityandroid:name=".AddActivity"android:exported="true" ></activity><activityandroid:name=".MainActivity"android:exported="true"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

2，Activity文件

ActivityRecord

package com.llw.notes;import android.content.Intent;
import android.graphics.drawable.AnimationDrawable;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;public class ActivityRecord extends AppCompatActivity {private Button btn_record;private int isRecording = 0;private int isPlaying = 0;//语音保存路径private String FilePath = null;private Timer mTimer;private ImageView iv_microphone;private TextView tv_recordTime;private ImageView iv_record_wave_left,iv_record_wave_right;private AnimationDrawable ad_left,ad_right;//语音操作对象private MediaPlayer mPlayer = null;private MediaRecorder mRecorder = null;Button btn_save;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_record);//设置为全屏模式getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);ActionBar actionBar=getSupportActionBar();actionBar.hide();btn_save = findViewById(R.id.bt_save);btn_save.setOnClickListener(new ClickEvent());Button btn_back = (Button)findViewById(R.id.bt_back);btn_back.setOnClickListener(new ClickEvent());btn_record = (Button)findViewById(R.id.btn_record);btn_record.setOnClickListener(new ClickEvent());iv_microphone = (ImageView)findViewById(R.id.iv_microphone);iv_microphone.setOnClickListener(new ClickEvent());iv_record_wave_left = (ImageView)findViewById(R.id.iv_record_wave_left);iv_record_wave_right = (ImageView)findViewById(R.id.iv_record_wave_right);
//        ad_left = (AnimationDrawable)iv_record_wave_left.getBackground();
//        ad_left = (AnimationDrawable)iv_record_wave_left.getBackground();// 通过逐帧动画的资源文件获得AnimationDrawable示例iv_record_wave_left.setImageResource(R.drawable.record_wave_left);iv_record_wave_right.setImageResource(R.drawable.record_wave_right);ad_left=((AnimationDrawable) iv_record_wave_left.getDrawable());ad_right=((AnimationDrawable) iv_record_wave_right.getDrawable());tv_recordTime = (TextView)findViewById(R.id.tv_recordTime);}final Handler handler = new Handler(){public void handleMessage(Message msg) {switch(msg.what){case 1 :String time[] = tv_recordTime.getText().toString().split(":");int hour = Integer.parseInt(time[0]);int minute = Integer.parseInt(time[1]);int second = Integer.parseInt(time[2]);if(second < 59){second++;}else if(second == 59 && minute < 59){minute++;second = 0;}if(second == 59 && minute == 59 && hour < 98){hour++;minute = 0;second = 0;}time[0] = hour + "";time[1] = minute + "";time[2] = second + "";//调整格式显示到屏幕上if(second < 10)time[2] = "0" + second;if(minute < 10)time[1] = "0" + minute;if(hour < 10)time[0] = "0" + hour;//显示在TextView中tv_recordTime.setText(time[0]+":"+time[1]+":"+time[2]);break;}}};class ClickEvent implements View.OnClickListener {@Overridepublic void onClick(View v) {switch(v.getId()){//点击的是开始录音按钮case  R.id.btn_record ://开始录音if(isRecording == 0){//每一次调用录音，可以录音多次，至多满意为至，最后只将最后一次的录音文件保存，其他的删除if(FilePath != null){File oldFile = new File(FilePath);oldFile.delete();}//获得系统当前时间，并以该时间作为文件名SimpleDateFormat formatter   =   new   SimpleDateFormat   ("yyyyMMddHHmmss");Date curDate   =   new   Date(System.currentTimeMillis());//获取当前时间String   str   =   formatter.format(curDate);str = str + "record.amr";File dir = new File("/sdcard/notes/");File file = new File("/sdcard/notes/",str);if (!dir.exists()) {dir.mkdir();}else{if(file.exists()){file.delete();}}FilePath = dir.getPath() +"/"+ str;//计时器mTimer = new Timer();//将麦克图标设置成不可点击，iv_microphone.setClickable(false);//将显示的时间设置为00:00:00tv_recordTime.setText("00:00:00");//将按钮换成停止录音isRecording = 1;btn_record.setBackgroundResource(R.drawable.tabbar_record_stop);mRecorder = new MediaRecorder();mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);mRecorder.setOutputFile(FilePath);mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);try {mRecorder.prepare();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}mRecorder.start();mTimer.schedule(new TimerTask() {@Overridepublic void run() {Message message = new Message();message.what = 1;handler.sendMessage(message);}},1000, 1000);//播放动画ad_left.start();ad_right.start();}//停止录音else{//将按钮换成开始录音isRecording = 0;btn_record.setBackgroundResource(R.drawable.tabbar_record_start);mRecorder.stop();mTimer.cancel();mTimer = null;mRecorder.release();mRecorder = null;//将麦克图标设置成可点击，iv_microphone.setClickable(true);//停止动画ad_left.stop();ad_right.stop();Toast.makeText(ActivityRecord.this, "单击麦克图标试听，再次点击结束试听", Toast.LENGTH_LONG).show();}break;//如果单击的是麦克图标，则可以是进入试听模式，再次点击，停止播放case R.id.iv_microphone :if(FilePath == null)Toast.makeText(ActivityRecord.this, "没有录音广播可以播放，请先录音", Toast.LENGTH_LONG).show();else{//试听if(isPlaying == 0){isPlaying = 1;mPlayer = new MediaPlayer();tv_recordTime.setText("00:00:00");mTimer = new Timer();mPlayer.setOnCompletionListener(new MediaCompletion());try {mPlayer.setDataSource(FilePath);mPlayer.prepare();mPlayer.start();} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}mTimer.schedule(new TimerTask() {@Overridepublic void run() {Message message = new Message();message.what = 1;handler.sendMessage(message);}}, 1000,1000);//播放动画ad_left.start();ad_right.start();}//结束试听else{isPlaying = 0;mPlayer.stop();mPlayer.release();mPlayer = null;mTimer.cancel();mTimer = null;//停止动画ad_left.stop();ad_right.stop();}}break;//点击确定按钮case R.id.bt_save ://将最终的录音文件的路径返回Intent intent = getIntent();Bundle b = new Bundle();b.putString("audio", FilePath);intent.putExtras(b);setResult(RESULT_OK, intent);ActivityRecord.this.finish();break;case R.id.bt_back ://返回前将录音的文件删除if(FilePath != null){File oldFile = new File(FilePath);oldFile.delete();}ActivityRecord.this.finish();break;}}}class MediaCompletion implements MediaPlayer.OnCompletionListener {@Overridepublic void onCompletion(MediaPlayer mp) {mTimer.cancel();mTimer = null;isPlaying = 0;//停止动画ad_left.stop();ad_right.stop();Toast.makeText(ActivityRecord.this, "播放完毕", Toast.LENGTH_LONG).show();tv_recordTime.setText("00:00:00");}}
}

AddActivity

package com.llw.notes;import android.annotation.SuppressLint;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.text.Editable;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.ImageSpan;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;public class AddActivity extends AppCompatActivity {private GridView bottomMenu;private LineEditText et_Notes;private Button bt_back;private Button bt_save;private SQLiteDatabase db;private DatabaseOperation dop;Intent intent;String editModel = null;int item_Id;InputMethodManager imm;//底部按钮private int[] bottomItems = {R.drawable.tabbar_handwrite,R.drawable.tabbar_paint,R.drawable.tabbar_microphone,R.drawable.tabbar_photo,R.drawable.tabbar_camera,R.drawable.tabbar_appendix};//记录editText中的图片，用于单击时判断单击的是那一个图片private List<Map<String,String>> imgList = new ArrayList<Map<String,String>>();//配置底部菜单private void initBottomMenu(){ArrayList<Map<String,Object>> menus = new ArrayList<Map<String,Object>>();for(int i = 0;i < bottomItems.length;i++){Map<String,Object> item = new HashMap<String,Object>();item.put("image",bottomItems[i]);menus.add(item);}bottomMenu.setNumColumns(bottomItems.length);bottomMenu.setSelector(R.drawable.bottom_item);SimpleAdapter mAdapter = new SimpleAdapter(AddActivity.this, menus,R.layout.item_button, new String[]{"image"}, new int[]{R.id.item_image});bottomMenu.setAdapter(mAdapter);}private TextView tv_title;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_add);//设置为全屏模式getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);ActionBar actionBar=getSupportActionBar();actionBar.hide();et_Notes = (LineEditText)findViewById(R.id.et_note);et_Notes.setOnClickListener(new TextClickEvent());bottomMenu = (GridView)findViewById(R.id.bottomMenu);//配置菜单initBottomMenu();bottomMenu.setOnItemClickListener(new MenuClickEvent());bt_back = (Button)findViewById(R.id.bt_back);bt_back.setOnClickListener(new ClickEvent());bt_save = (Button)findViewById(R.id.bt_save);bt_save.setOnClickListener(new ClickEvent());//默认关闭软键盘,可以通过失去焦点设置//et_Notes.setFocusable(false);imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);imm.hideSoftInputFromWindow(et_Notes.getWindowToken(),0);dop = new DatabaseOperation(this,db);intent = getIntent();editModel = intent.getStringExtra("editModel");item_Id = intent.getIntExtra("noteId", 0);tv_title = (TextView)findViewById(R.id.tv_title);loadData();}//为EidtText设置监听器class TextClickEvent implements View.OnClickListener {@Overridepublic void onClick(View v) {Spanned s = et_Notes.getText();ImageSpan[] imageSpans;imageSpans = s.getSpans(0, s.length(), ImageSpan.class);int selectionStart = et_Notes.getSelectionStart();for(ImageSpan span : imageSpans){int start = s.getSpanStart(span);int end = s.getSpanEnd(span);//找到图片if(selectionStart >= start && selectionStart < end){//Bitmap bitmap = ((BitmapDrawable)span.getDrawable()).getBitmap();//查找当前单击的图片是哪一个图片//System.out.println(start+"-----------"+end);String path = null;for(int i = 0;i < imgList.size();i++){Map map = imgList.get(i);//找到了if(map.get("location").equals(start+"-"+end)){path = imgList.get(i).get("path");break;}}//接着判断当前图片是否是录音，如果为录音，则跳转到试听录音的Activity，如果不是，则跳转到查看图片的界面//录音，则跳转到试听录音的Activityif(path.substring(path.length()-3, path.length()).equals("amr")){Intent intent = new Intent(AddActivity.this,ShowRecord.class);intent.putExtra("audioPath", path);startActivity(intent);}//图片，则跳转到查看图片的界面else{//有两种方法，查看图片，第一种就是直接调用系统的图库查看图片，第二种是自定义Activity//调用系统图库查看图片/*Intent intent = new Intent(Intent.ACTION_VIEW);File file = new File(path);Uri uri = Uri.fromFile(file);intent.setDataAndType(uri, "image/*");*///使用自定义ActivityIntent intent = new Intent(AddActivity.this,ShowPicture.class);intent.putExtra("imgPath", path);startActivity(intent);}}else//如果单击的是空白出或文字，则获得焦点，即打开软键盘imm.showSoftInput(et_Notes, 0);}}}//加载数据private void loadData(){//如果是新增记事模式，则将editText清空if(editModel.equals("newAdd")){et_Notes.setText("");}//如果编辑的是已存在的记事，则将数据库的保存的数据取出，并显示在EditText中else if(editModel.equals("update")){tv_title.setText("编辑记事");dop.create_db();Cursor cursor = dop.query_db(item_Id);cursor.moveToFirst();//取出数据库中相应的字段内容@SuppressLint("Range") String context = cursor.getString(cursor.getColumnIndex("context"));//定义正则表达式，用于匹配路径Pattern p=Pattern.compile("/([^\\.]*)\\.\\w{3}");Matcher m=p.matcher(context);int startIndex = 0;while(m.find()){//取出路径前的文字if(m.start() > 0){et_Notes.append(context.substring(startIndex, m.start()));}SpannableString ss = new SpannableString(m.group().toString());//取出路径String path = m.group().toString();//取出路径的后缀String type = path.substring(path.length() - 3, path.length());Bitmap bm = null;Bitmap rbm = null;//判断附件的类型，如果是录音文件，则从资源文件中加载图片if(type.equals("amr")){bm = BitmapFactory.decodeResource(getResources(), R.drawable.record_icon);//缩放图片rbm = resize(bm,200);}else{//取出图片bm = BitmapFactory.decodeFile(m.group());//缩放图片rbm = resize(bm,480);}//为图片添加边框效果rbm = getBitmapHuaSeBianKuang(rbm);System.out.println(rbm.getWidth()+"-------"+rbm.getHeight());ImageSpan span = new ImageSpan(this, rbm);ss.setSpan(span,0, m.end() - m.start(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);et_Notes.append(ss);startIndex = m.end();//用List记录该录音的位置及所在路径，用于单击事件Map<String,String> map = new HashMap<String,String>();map.put("location", m.start()+"-"+m.end());map.put("path", path);imgList.add(map);}//将最后一个图片之后的文字添加在TextView中et_Notes.append(context.substring(startIndex,context.length()));dop.close_db();}}//等比例缩放图片private Bitmap resize(Bitmap bitmap,int S){int imgWidth = bitmap.getWidth();int imgHeight = bitmap.getHeight();double partion = imgWidth*1.0/imgHeight;double sqrtLength = Math.sqrt(partion*partion + 1);//新的缩略图大小double newImgW = S*(partion / sqrtLength);double newImgH = S*(1 / sqrtLength);float scaleW = (float) (newImgW/imgWidth);float scaleH = (float) (newImgH/imgHeight);Matrix mx = new Matrix();//坐标//对原图片进行缩放mx.postScale(scaleW, scaleH);bitmap = Bitmap.createBitmap(bitmap, 0, 0, imgWidth, imgHeight, mx, true);return bitmap;}//给图片加边框，并返回边框后的图片public Bitmap getBitmapHuaSeBianKuang(Bitmap bitmap) {float frameSize = 0.2f;Matrix matrix = new Matrix();// 用来做底图Bitmap bitmapbg = Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), Bitmap.Config.ARGB_8888);// 设置底图为画布Canvas canvas = new Canvas(bitmapbg);canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG| Paint.FILTER_BITMAP_FLAG));float scale_x = (bitmap.getWidth() - 2 * frameSize - 2) * 1f/ (bitmap.getWidth());float scale_y = (bitmap.getHeight() - 2 * frameSize - 2) * 1f/ (bitmap.getHeight());matrix.reset();matrix.postScale(scale_x, scale_y);// 对相片大小处理(减去边框的大小)bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),bitmap.getHeight(), matrix, true);Paint paint = new Paint();paint.setColor(Color.WHITE);paint.setStrokeWidth(1);paint.setStyle(Paint.Style.FILL);// 绘制底图边框canvas.drawRect(new Rect(0, 0, bitmapbg.getWidth(), bitmapbg.getHeight()),paint);// 绘制灰色边框paint.setColor(Color.BLUE);canvas.drawRect(new Rect((int) (frameSize), (int) (frameSize), bitmapbg.getWidth() - (int) (frameSize), bitmapbg.getHeight()- (int) (frameSize)), paint);canvas.drawBitmap(bitmap, frameSize + 1, frameSize + 1, paint);return bitmapbg;}//设置按钮监听器class ClickEvent implements View.OnClickListener {@Overridepublic void onClick(View v) {switch(v.getId()){case R.id.bt_back ://当前Activity结束，则返回上一个ActivityAddActivity.this.finish();break;//将记事添加到数据库中case R.id.bt_save ://取得EditText中的内容String context = et_Notes.getText().toString();if(context.isEmpty()){Toast.makeText(AddActivity.this, "记事为空!", Toast.LENGTH_LONG).show();}else{//取得当前时间SimpleDateFormat formatter   =   new   SimpleDateFormat   ("yyyy-MM-dd HH:mm");Date curDate   =   new   Date(System.currentTimeMillis());//获取当前时间String   time   =   formatter.format(curDate);//截取EditText中的前一部分作为标题，用于显示在主页列表中String title = (String) getTitle(context);//打开数据库dop.create_db();//判断是更新还是新增记事if(editModel.equals("newAdd")){//将记事插入到数据库中dop.insert_db(title,context,time);}//如果是编辑则更新记事即可else if(editModel.equals("update")){dop.update_db(title,context,time,item_Id);}dop.close_db();Intent intent=new Intent(AddActivity.this,MainActivity.class);startActivity(intent);//结束当前activityAddActivity.this.finish();}break;}}}//截取EditText中的前一部分作为标题，用于显示在主页列表中private String getTitle(String context){//定义正则表达式，用于匹配路径Pattern p=Pattern.compile("/([^\\.]*)\\.\\w{3}");Matcher m=p.matcher(context);StringBuffer strBuff = new StringBuffer();String title = "";int startIndex = 0;while(m.find()){//取出路径前的文字if(m.start() > 0){strBuff.append(context.substring(startIndex, m.start()));}//取出路径String path = m.group().toString();//取出路径的后缀String type = path.substring(path.length() - 3, path.length());//判断附件的类型if(type.equals("amr")){strBuff.append("[录音]");}else{strBuff.append("[图片]");}startIndex = m.end();//只取出前15个字作为标题if(strBuff.length() > 15){//统一将回车,等特殊字符换成空格title = strBuff.toString().replaceAll("\r|\n|\t", " ");return title;}}strBuff.append(context.substring(startIndex, context.length()));//统一将回车,等特殊字符换成空格title = strBuff.toString().replaceAll("\r|\n|\t", " ");return title;}//设置菜单项监听器class MenuClickEvent implements AdapterView.OnItemClickListener {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {Intent intent;switch(position){//手写case 0:intent = new Intent(AddActivity.this,HandWriteActivity.class);startActivityForResult(intent, 5);break;//绘图case 1:intent = new Intent(AddActivity.this,PaintActivity.class);startActivityForResult(intent, 3);break;//语音case 2:intent = new Intent(AddActivity.this,ActivityRecord.class);startActivityForResult(intent, 4);break;//照片case 3:intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*");startActivityForResult(intent, 1);break;//拍照case 4 ://调用系统拍照界面intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);//区分选择相片startActivityForResult(intent, 2);//附件case 5 :break;}}}//将图片等比例缩放到合适的大小并添加在EditText中void InsertBitmap(Bitmap bitmap,int S,String imgPath){bitmap = resize(bitmap,S);//添加边框效果bitmap = getBitmapHuaSeBianKuang(bitmap);//bitmap = addBigFrame(bitmap,R.drawable.line_age);final ImageSpan imageSpan = new ImageSpan(this,bitmap);SpannableString spannableString = new SpannableString(imgPath);spannableString.setSpan(imageSpan, 0, spannableString.length(), SpannableString.SPAN_MARK_MARK);//光标移到下一行//et_Notes.append("\n");Editable editable = et_Notes.getEditableText();int selectionIndex = et_Notes.getSelectionStart();spannableString.getSpans(0, spannableString.length(), ImageSpan.class);//将图片添加进EditText中editable.insert(selectionIndex, spannableString);//添加图片后自动空出两行et_Notes.append("\n");//用List记录该录音的位置及所在路径，用于单击事件Map<String,String> map = new HashMap<String,String>();map.put("location", selectionIndex+"-"+(selectionIndex+spannableString.length()));map.put("path", imgPath);imgList.add(map);}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if(resultCode == RESULT_OK){//取得数据Uri uri = data.getData();ContentResolver cr = AddActivity.this.getContentResolver();Bitmap bitmap = null;Bundle extras = null;//如果是选择照片if(requestCode == 1){// 这里开始的第二部分，获取图片的路径：String[] proj = {MediaStore.Images.Media.DATA};Cursor cursor = managedQuery(uri, proj, null, null, null);//按我个人理解 这个是获得用户选择的图片的索引值int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);cursor.moveToFirst();
//最后根据索引值获取图片路径String path = cursor.getString(column_index);System.out.println("pppppp:"+path);try {//将对象存入Bitmap中bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}//插入图片InsertBitmap(bitmap,480,path);}//如果选择的是拍照else if(requestCode == 2){System.out.println("-----fjwefowefwef");;try {if(uri != null)//这个方法是根据Uri获取Bitmap图片的静态方法bitmap = MediaStore.Images.Media.getBitmap(cr, uri);//这里是有些拍照后的图片是直接存放到Bundle中的所以我们可以从这里面获取Bitmap图片else{extras = data.getExtras();bitmap = extras.getParcelable("data");}//将拍的照片存入指定的文件夹下//获得系统当前时间，并以该时间作为文件名SimpleDateFormat   formatter   =   new   SimpleDateFormat   ("yyyyMMddHHmmss");Date   curDate   =   new   Date(System.currentTimeMillis());//获取当前时间String   str   =   formatter.format(curDate);String paintPath = "";str = str + "paint.png";File dir = new File("/sdcard/notes/");File file = new File("/sdcard/notes/",str);if (!dir.exists()) {dir.mkdir();}else{if(file.exists()){file.delete();}}FileOutputStream fos = new FileOutputStream(file);// 将 bitmap 压缩成其他格式的图片数据bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);fos.flush();fos.close();String path = "/sdcard/notes/" + str;//插入图片System.out.println("tttttttttt:"+path);InsertBitmap(bitmap,480,path);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}//返回的是绘图后的结果else if(requestCode == 3){extras = data.getExtras();String path = extras.getString("paintPath");//通过路径取出图片，放入bitmap中bitmap = BitmapFactory.decodeFile(path);//插入绘图文件InsertBitmap(bitmap,480,path);}//返回的是录音文件else if(requestCode == 4){extras = data.getExtras();String audioPath = extras.getString("audio");bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.record_microphone_icon);//插入录音图标InsertBitmap(bitmap,80,audioPath);}//返回的是手写文件else if(requestCode == 5){extras = data.getExtras();String path = extras.getString("handwritePath");//通过路径取出图片，放入bitmap中bitmap = BitmapFactory.decodeFile(path);//插入绘图文件InsertBitmap(bitmap,680,path);}}}
}

DatabaseOperation

package com.llw.notes;import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.widget.Toast;public class DatabaseOperation {private SQLiteDatabase db;private Context context;public DatabaseOperation(Context context,SQLiteDatabase db) {this.db = db;this.context = context;}//数据库的打开或创建public void create_db(){//创建或打开数据库db = SQLiteDatabase.openOrCreateDatabase(context.getFilesDir().toString()+"/mynotes.db3", null);db.execSQL("DROP TABLE IF EXISTS studentScore");if(db == null){Toast.makeText(context,"数据库创建不成功",Toast.LENGTH_LONG).show();}//Toast.makeText(context,"数据库创建成功",Toast.LENGTH_LONG).show();//创建表db.execSQL("create table if not exists notes(_id integer primary key autoincrement," +"title text," +"context text," +"time varchar(20))");}public void insert_db(String title,String text,String time){if(text.isEmpty()){Toast.makeText(context, "各字段不能为空", Toast.LENGTH_LONG).show();}else{db.execSQL("insert into notes(title,context,time) values('"+ title+"','"+ text+ "','"+time+"');");//Toast.makeText(context, "插入成功", Toast.LENGTH_LONG).show();}}public void update_db(String title,String text,String time,int item_ID){if( text.isEmpty()){Toast.makeText(context, "各字段不能为空", Toast.LENGTH_LONG).show();}else{//String sql = "update main set class1='" + class1 + "',class2='" + class2 + "',class3='" + class4 + "',class4='" + class4 + "'where days='" + days + "';";db.execSQL("update notes set context='"+text+ "',title='"+title+"',time='"+time+"'where _id='" + item_ID+"'");//Toast.makeText(context, "修改成功", Toast.LENGTH_LONG).show();}}public Cursor query_db(){Cursor cursor = db.rawQuery("select * from notes",null);return cursor;}public Cursor query_db(int item_ID){Cursor cursor = db.rawQuery("select * from notes where _id='"+item_ID+"';",null);return cursor;}public void delete_db(int item_ID){db.execSQL("delete from notes where _id='" + item_ID+"'");//Toast.makeText(context, "删除成功", Toast.LENGTH_LONG).show();}//关闭数据库public void close_db(){db.close();}
}

GetCutBitampLocation

package com.llw.notes;public class GetCutBitmapLocation {private float cutLeft = 0;private float cutTop = 0;private float cutRight = 0;private float cutBottom = 0;public void init(float x,float y){cutLeft = x;cutRight = x;cutTop = y;cutBottom = y;}//更新手写字的左右上下的位置public void setCutLeftAndRight(float x,float y){cutLeft = (x < cutLeft ? x : cutLeft);cutRight = (x > cutRight ? x : cutRight);cutTop = (y < cutTop ? y : cutTop);cutBottom = (y > cutBottom ? y : cutBottom);}//返回手写字的切割位置public float getCutLeft(){return cutLeft;}public float getCutTop(){return cutTop;}public float getCutRight(){return cutRight;}public float getCutBottom(){return cutBottom;}}

HandWriteActivity

package com.llw.notes;import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Matrix;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Editable;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ImageSpan;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.SimpleAdapter;import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;public class HandWriteActivity extends AppCompatActivity {private LinearLayout paintLayout;private GridView paint_bottomMenu;private LineEditText et_handwrite;private TouchView touchView;private ArrayList<CharSequence> deleteChar = new ArrayList<CharSequence>();//菜单资源private int[]  paintItems = {R.drawable.paint_pencil,R.drawable.paint_icon_color,R.drawable.paint_icon_back,R.drawable.paint_icon_forward,R.drawable.paint_icon_delete};private Button btn_save;private Button btn_back;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_hand_write);//设置为全屏模式getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);ActionBar actionBar=getSupportActionBar();actionBar.hide();paint_bottomMenu = (GridView)findViewById(R.id.paintBottomMenu);paint_bottomMenu.setOnItemClickListener(new MenuClickEvent());et_handwrite = (LineEditText)findViewById(R.id.et_handwrite);InitPaintMenu();touchView = (TouchView)findViewById(R.id.touch_view);touchView.setHandler(handler);btn_save = (Button)findViewById(R.id.bt_save);btn_back = (Button)findViewById(R.id.bt_back);btn_save.setOnClickListener(new ClickEvent());btn_back.setOnClickListener(new ClickEvent());}class ClickEvent implements View.OnClickListener {@Overridepublic void onClick(View v) {if(v == btn_save){//得到调用该Activity的Intent对象Intent intent = getIntent();Bundle b = new Bundle();String path = saveBitmap();b.putString("handwritePath", path);intent.putExtras(b);setResult(RESULT_OK, intent);HandWriteActivity.this.finish();}else if(v == btn_back){HandWriteActivity.this.finish();}}}//保存手写文件public String saveBitmap(){//获得系统当前时间，并以该时间作为文件名SimpleDateFormat formatter   =   new   SimpleDateFormat   ("yyyyMMddHHmmss");Date curDate   =   new   Date(System.currentTimeMillis());//获取当前时间String   str   =   formatter.format(curDate);String paintPath = "";str = str + "write.png";File dir = new File("/sdcard/notes/");File file = new File("/sdcard/notes/",str);if (!dir.exists()) {dir.mkdir();}else{if(file.exists()){file.delete();}}//将view转换成图片et_handwrite.setDrawingCacheEnabled(true);et_handwrite.setDrawingCacheBackgroundColor(Color.WHITE);Bitmap cutHandwriteBitmap = Bitmap.createBitmap(et_handwrite.getDrawingCache());et_handwrite.setDrawingCacheEnabled(false);try {//保存绘图文件路径paintPath = "/sdcard/notes/" + str;FileOutputStream out = new FileOutputStream(file);cutHandwriteBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);out.close();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return paintPath;}//配置绘图菜单public void InitPaintMenu(){ArrayList<Map<String,Object>> menus = new ArrayList<Map<String,Object>>();for(int i = 0;i < paintItems.length;i++){Map<String,Object> item = new HashMap<String,Object>();item.put("image",paintItems[i]);menus.add(item);}paint_bottomMenu.setNumColumns(paintItems.length);paint_bottomMenu.setSelector(R.drawable.bottom_item);SimpleAdapter mAdapter = new SimpleAdapter(HandWriteActivity.this, menus,R.layout.item_button, new String[]{"image"}, new int[]{R.id.item_image});paint_bottomMenu.setAdapter(mAdapter);}//处理界面Handler handler = new Handler(){@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);Bundle bundle = new Bundle();bundle = msg.getData();Bitmap myBitmap = bundle.getParcelable("bitmap");InsertToEditText(myBitmap);}};//将手写字插入到EditText中private void InsertToEditText(Bitmap mBitmap){int imgWidth = mBitmap.getWidth();int imgHeight = mBitmap.getHeight();//缩放比例float scaleW = (float) (160f/imgWidth);float scaleH = (float) (200f/imgHeight);Matrix mx = new Matrix();//对原图片进行缩放mx.postScale(scaleW, scaleH);mBitmap = Bitmap.createBitmap(mBitmap, 0, 0, imgWidth, imgHeight, mx, true);//将手写的字插入到edittext中SpannableString ss = new SpannableString("1");ImageSpan span = new ImageSpan(mBitmap, ImageSpan.ALIGN_BOTTOM);ss.setSpan(span, 0, 1, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);et_handwrite.append(ss);}//设置菜单项监听器class MenuClickEvent implements AdapterView.OnItemClickListener {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {switch(position){//画笔大小case 0:showPaintSizeDialog(view);break;//颜色case 1:showPaintColorDialog(view);break;//删除case 2:Editable editable = et_handwrite.getText();//找到最后一个手写字,并删除最后一个手写字int selectionEnd = et_handwrite.getSelectionEnd();System.out.println("end = "+ selectionEnd);if(selectionEnd < 1){et_handwrite.setText("");}else if(selectionEnd == 1){et_handwrite.setText("");CharSequence deleteCharSeq = editable.subSequence(0,1);deleteChar.add(deleteCharSeq);}else{System.out.println("delete");CharSequence charSeq = editable.subSequence(0, selectionEnd - 1);CharSequence deleteCharSeq = editable.subSequence(selectionEnd - 1,selectionEnd);et_handwrite.setText(charSeq);et_handwrite.setSelection(selectionEnd - 1);//将删除的字存储到列表中，以便恢复使用deleteChar.add(deleteCharSeq);}break;//恢复case 3://取出删除列表中的元素int length = deleteChar.size();if(length > 0){et_handwrite.append(deleteChar.get(deleteChar.size()-1));deleteChar.remove(deleteChar.size()-1);}break;//清空屏幕case 4 :if(et_handwrite.getSelectionEnd() > 0){AlertDialog.Builder builder = new AlertDialog.Builder(HandWriteActivity.this);builder.setTitle("您确定要清空所有吗？");builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {et_handwrite.setText("");dialog.cancel();}});builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.cancel();}});Dialog dialog = builder.create();dialog.show();}break;default :break;}}}private int select_handwrite_color_index = 0;private int select_handwrite_size_index = 0;//弹出画笔大小选项对话框public void showPaintSizeDialog(View parent){AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this,R.style.custom_dialog);alertDialogBuilder.setTitle("选择画笔大小：");alertDialogBuilder.setSingleChoiceItems(R.array.paintsize, select_handwrite_size_index, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {select_handwrite_size_index = which;touchView.selectHandWritetSize(which);dialog.dismiss();}});alertDialogBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});alertDialogBuilder.create().show();}//弹出画笔颜色选项对话框public void showPaintColorDialog(View parent){AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this,R.style.custom_dialog);alertDialogBuilder.setTitle("选择画笔颜色：");alertDialogBuilder.setSingleChoiceItems(R.array.paintcolor, select_handwrite_color_index, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {select_handwrite_color_index = which;touchView.selectHandWriteColor(which);dialog.dismiss();}});alertDialogBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});alertDialogBuilder.create().show();}
}

LineEditActivity

package com.llw.notes;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;public class LineEditText extends androidx.appcompat.widget.AppCompatEditText {private Rect mRect;private Paint mPaint;public LineEditText(Context context, AttributeSet attrs) {// TODO Auto-generated constructor stubsuper(context,attrs);mRect = new Rect();mPaint = new Paint();mPaint.setColor(Color.GRAY);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//得到EditText的总行数int lineCount = getLineCount();Rect r = mRect;Paint p = mPaint;//为每一行设置格式for(int i = 0; i < lineCount;i++){//取得每一行的基准Y坐标，并将每一行的界限值写到r中int baseline = getLineBounds(i, r);//设置每一行的文字带下划线canvas.drawLine(r.left, baseline+20, r.right, baseline+20, p);}}
}

MainActivity

package com.llw.notes;import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {private Button bt_add;private SQLiteDatabase db;private DatabaseOperation dop;private ListView lv_notes;private TextView tv_note_id;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//设置为全屏模式getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);ActionBar actionBar=getSupportActionBar();actionBar.hide();bt_add = (Button)findViewById(R.id.bt_add);bt_add.setOnClickListener(new ClickEvent());dop = new DatabaseOperation(this, db);lv_notes = (ListView)findViewById(R.id.lv_notes);
//显示记事列表showNotesList();
//为记事列表添加监听器lv_notes.setOnItemClickListener(new ItemClickEvent());lv_notes.setOnItemLongClickListener(new ItemLongClickEvent());}//记事列表长按监听器class ItemLongClickEvent implements AdapterView.OnItemLongClickListener {@Overridepublic boolean onItemLongClick(AdapterView<?> parent, View view,int position, long id) {tv_note_id = (TextView)view.findViewById(R.id.tv_note_id);int item_id = Integer.parseInt(tv_note_id.getText().toString());simpleList(item_id);return true;}}//简单列表对话框，用于选择操作public void simpleList(final int item_id){AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this,R.style.custom_dialog);alertDialogBuilder.setTitle("选择操作");alertDialogBuilder.setIcon(R.drawable.ic_launcher);alertDialogBuilder.setItems(R.array.itemOperation, new android.content.DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {switch(which){//编辑case 0 :Intent intent = new Intent(MainActivity.this,AddActivity.class);intent.putExtra("editModel", "update");intent.putExtra("noteId", item_id);startActivity(intent);break;//删除case 1 :dop.create_db();dop.delete_db(item_id);dop.close_db();//刷新列表显示lv_notes.invalidate();showNotesList();break;}}});alertDialogBuilder.create();alertDialogBuilder.show();}//显示记事列表private void showNotesList(){//创建或打开数据库dop.create_db();Cursor cursor = dop.query_db();SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,R.layout.note_item,cursor,new String[]{"_id","title","time"}, new int[]{R.id.tv_note_id,R.id.tv_note_title,R.id.tv_note_time});lv_notes.setAdapter(adapter);dop.close_db();}//记事列表单击监听器class ItemClickEvent implements AdapterView.OnItemClickListener {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {tv_note_id = (TextView)view.findViewById(R.id.tv_note_id);int item_id = Integer.parseInt(tv_note_id.getText().toString());Intent intent = new Intent(MainActivity.this,AddActivity.class);intent.putExtra("editModel", "update");intent.putExtra("noteId", item_id);startActivity(intent);finish();}}class ClickEvent implements View.OnClickListener {@Overridepublic void onClick(View v) {switch(v.getId()){case R.id.bt_add :Intent intent = new Intent(MainActivity.this,AddActivity.class);intent.putExtra("editModel", "newAdd");startActivity(intent);finish();}}}
}

PaintActivity

package com.llw.notes;import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ListView;
import android.widget.SimpleAdapter;import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;public class PaintActivity extends Activity {private PaintView paintView;private GridView paint_bottomMenu;private ListView lv_popWindow;//菜单资源private int[]  paintItems = {R.drawable.paint_more,R.drawable.paint_pencil,R.drawable.paint_icon_color,R.drawable.paint_icon_back,R.drawable.paint_icon_forward,R.drawable.paint_icon_delete};//画笔大小资源private int[] penceilSizes = {};private Button btn_save;private Button btn_back;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_paint);paint_bottomMenu = (GridView)findViewById(R.id.paintBottomMenu);paint_bottomMenu.setOnItemClickListener(new MenuClickEvent());paintView = (PaintView)findViewById(R.id.paint_layout);InitPaintMenu();btn_save = (Button)findViewById(R.id.bt_save);btn_back = (Button)findViewById(R.id.bt_back);btn_save.setOnClickListener(new ClickEvent());btn_back.setOnClickListener(new ClickEvent());}//配置绘图菜单public void InitPaintMenu(){ArrayList<Map<String,Object>> menus = new ArrayList<Map<String,Object>>();for(int i = 0;i < paintItems.length;i++){Map<String,Object> item = new HashMap<String,Object>();item.put("image",paintItems[i]);menus.add(item);}paint_bottomMenu.setNumColumns(paintItems.length);paint_bottomMenu.setSelector(R.drawable.bottom_item);SimpleAdapter mAdapter = new SimpleAdapter(PaintActivity.this, menus,R.layout.item_button, new String[]{"image"}, new int[]{R.id.item_image});paint_bottomMenu.setAdapter(mAdapter);}class ClickEvent implements OnClickListener{@Overridepublic void onClick(View v) {if(v == btn_save){//得到调用该Activity的Intent对象Intent intent = getIntent();Bundle b = new Bundle();String path = paintView.saveBitmap();b.putString("paintPath", path);intent.putExtras(b);setResult(RESULT_OK, intent);PaintActivity.this.finish();}else if(v == btn_back){PaintActivity.this.finish();}}}//设置菜单项监听器class MenuClickEvent implements OnItemClickListener{@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {Intent intent;switch(position){case 0:showMoreDialog(view);break;//画笔大小case 1:showPaintSizeDialog(view);break;//画笔颜色case 2:showPaintColorDialog(view);break;//撤销case 3:paintView.undo();break;//恢复case 4 :paintView.redo();break;//清空case 5 :AlertDialog.Builder builder = new AlertDialog.Builder(PaintActivity.this,R.style.custom_dialog);builder.setTitle("清空提示");builder.setMessage("您确定要清空所有吗？");builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {paintView.removeAllPaint();dialog.cancel();}});builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.cancel();}});Dialog dialog = builder.create();dialog.show();break;default :break;}}}//弹出画笔颜色选项对话框public void showPaintColorDialog(View parent){AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this,R.style.custom_dialog);alertDialogBuilder.setTitle("选择画笔颜色：");alertDialogBuilder.setSingleChoiceItems(R.array.paintcolor, select_paint_color_index, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {select_paint_color_index = which;paintView.selectPaintColor(which);dialog.dismiss();}});alertDialogBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});alertDialogBuilder.create().show();}//弹出画笔大小选项对话框public void showPaintSizeDialog(View parent){AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this,R.style.custom_dialog);alertDialogBuilder.setTitle("选择画笔大小：");alertDialogBuilder.setSingleChoiceItems(R.array.paintsize, select_paint_size_index, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {select_paint_size_index = which;paintView.selectPaintSize(which);dialog.dismiss();}});alertDialogBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});alertDialogBuilder.create().show();}private int select_paint_size_index = 0;private int select_paint_style_index = 0;private int select_paint_color_index = 0;//弹出选择画笔或橡皮擦的对话框public void showMoreDialog(View parent){AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this,R.style.custom_dialog);alertDialogBuilder.setTitle("选择画笔或橡皮擦：");alertDialogBuilder.setSingleChoiceItems(R.array.paintstyle, select_paint_style_index, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {select_paint_style_index = which;paintView.selectPaintStyle(which);dialog.dismiss();}});alertDialogBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});alertDialogBuilder.create().show();}
}

PaintView

package com.llw.notes;import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.View;import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;public class PaintView extends View  {private Canvas  mCanvas;private Path    mPath;private Paint   mBitmapPaint;private Bitmap  mBitmap;private Paint mPaint;private ArrayList<DrawPath> savePath;private ArrayList<DrawPath> deletePath;private DrawPath dp;private float mX, mY;private static final float TOUCH_TOLERANCE = 4;private int bitmapWidth;private int bitmapHeight;private int currentColor = Color.RED;private int currentSize = 5;private int currentStyle = 1;//设置画笔样式public void setPaintStyle(){mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setDither(true);mPaint.setStyle(Paint.Style.STROKE);mPaint.setStrokeJoin(Paint.Join.ROUND);mPaint.setStrokeCap(Paint.Cap.ROUND);mPaint.setStrokeWidth(currentSize);if(currentStyle == 1)mPaint.setColor(currentColor);else{mPaint.setColor(Color.WHITE);}}//初始化画布public void initCanvas(){setPaintStyle();mBitmapPaint = new Paint(Paint.DITHER_FLAG);//画布大小mBitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight,Bitmap.Config.RGB_565);mCanvas = new Canvas(mBitmap);  //所有mCanvas画的东西都被保存在了mBitmap中mCanvas.drawColor(Color.WHITE);mPath = new Path();mBitmapPaint = new Paint(Paint.DITHER_FLAG);}//画笔颜色private int[] paintColor = {Color.RED,Color.BLUE,Color.BLACK,Color.GREEN,Color.YELLOW,Color.CYAN,Color.LTGRAY};//设置画笔样式public void selectPaintStyle(int which){if(which == 0){currentStyle = 1;setPaintStyle();}//当选择的是橡皮擦时，设置颜色为白色if(which == 1){currentStyle = 2;setPaintStyle();mPaint.setStrokeWidth(20);}}//选择画笔大小public void selectPaintSize(int which){int size =Integer.parseInt(this.getResources().getStringArray(R.array.paintsize)[which]);currentSize = size;setPaintStyle();}//设置画笔颜色public void selectPaintColor(int which){currentColor = paintColor[which];setPaintStyle();}public PaintView(Context c) {super(c);//得到屏幕的分辨率DisplayMetrics dm = new DisplayMetrics();((Activity) c).getWindowManager().getDefaultDisplay().getMetrics(dm);bitmapWidth = dm.widthPixels;bitmapHeight = dm.heightPixels - 2 * 45;initCanvas();savePath = new ArrayList<DrawPath>();deletePath = new ArrayList<DrawPath>();}public PaintView(Context c, AttributeSet attrs) {super(c,attrs);//得到屏幕的分辨率DisplayMetrics dm = new DisplayMetrics();((Activity) c).getWindowManager().getDefaultDisplay().getMetrics(dm);bitmapWidth = dm.widthPixels;bitmapHeight = dm.heightPixels - 2 * 45;initCanvas();savePath = new ArrayList<DrawPath>();deletePath = new ArrayList<DrawPath>();}@Overrideprotected void onDraw(Canvas canvas) {canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);     //显示旧的画布if (mPath != null) {// 实时的显示canvas.drawPath(mPath, mPaint);}}//路径对象class DrawPath{Path path;Paint paint;}/*** 撤销的核心思想就是将画布清空，* 将保存下来的Path路径最后一个移除掉，* 重新将路径画在画布上面。*/public void undo(){System.out.println(savePath.size()+"--------------");if(savePath != null && savePath.size() > 0){//调用初始化画布函数以清空画布initCanvas();//将路径保存列表中的最后一个元素删除 ,并将其保存在路径删除列表中DrawPath drawPath = savePath.get(savePath.size() - 1);deletePath.add(drawPath);savePath.remove(savePath.size() - 1);//将路径保存列表中的路径重绘在画布上Iterator<DrawPath> iter = savePath.iterator();     //重复保存while (iter.hasNext()) {DrawPath dp = iter.next();mCanvas.drawPath(dp.path, dp.paint);}invalidate();// 刷新}}/*** 恢复的核心思想就是将撤销的路径保存到另外一个列表里面(栈)，* 然后从redo的列表里面取出最顶端对象，* 画在画布上面即可*/public void redo(){if(deletePath.size() > 0){//将删除的路径列表中的最后一个，也就是最顶端路径取出（栈）,并加入路径保存列表中DrawPath dp = deletePath.get(deletePath.size() - 1);savePath.add(dp);//将取出的路径重绘在画布上mCanvas.drawPath(dp.path, dp.paint);//将该路径从删除的路径列表中去除deletePath.remove(deletePath.size() - 1);invalidate();}}/** 清空的主要思想就是初始化画布* 将保存路径的两个List清空* */public void removeAllPaint(){//调用初始化画布函数以清空画布initCanvas();invalidate();//刷新savePath.clear();deletePath.clear();}/** 保存所绘图形* 返回绘图文件的存储路径* */public String saveBitmap(){//获得系统当前时间，并以该时间作为文件名SimpleDateFormat   formatter   =   new   SimpleDateFormat   ("yyyyMMddHHmmss");Date   curDate   =   new   Date(System.currentTimeMillis());//获取当前时间String   str   =   formatter.format(curDate);String paintPath = "";str = str + "paint.png";File dir = new File("/sdcard/notes/");File file = new File("/sdcard/notes/",str);if (!dir.exists()) {dir.mkdir();}else{if(file.exists()){file.delete();}}try {FileOutputStream out = new FileOutputStream(file);mBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);//压缩out.flush();out.close();//保存绘图文件路径paintPath = "/sdcard/notes/" + str;} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return paintPath;}private void touch_start(float x, float y) {mPath.reset();//清空pathmPath.moveTo(x, y);mX = x;mY = y;}private void touch_move(float x, float y) {float dx = Math.abs(x - mX);float dy = Math.abs(y - mY);if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {//mPath.quadTo(mX, mY, x, y);mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);//源代码是这样写的，可是我没有弄明白，为什么要这样？mX = x;mY = y;}}private void touch_up() {mPath.lineTo(mX, mY);mCanvas.drawPath(mPath, mPaint);savePath.add(dp);mPath = null;}@Overridepublic boolean onTouchEvent(MotionEvent event) {float x = event.getX();float y = event.getY();switch (event.getAction()) {case MotionEvent.ACTION_DOWN:mPath = new Path();dp = new DrawPath();dp.path = mPath;dp.paint = mPaint;touch_start(x, y);invalidate(); //清屏break;case MotionEvent.ACTION_MOVE:touch_move(x, y);invalidate();break;case MotionEvent.ACTION_UP:touch_up();invalidate();break;}return true;}}

ShowPicture

package com.llw.notes;import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.RectF;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;public class ShowPicture extends AppCompatActivity {private ImageView img;private Bitmap bm;private DisplayMetrics dm;private Matrix matrix = new Matrix();private Matrix savedMatrix = new Matrix();private PointF mid = new PointF();private PointF start = new PointF();private static int DRAG = 2;private static int ZOOM = 1;private static int NONE = 0;private int mode = 0;private float oldDist = 1f;private static float MINSCALER = 0.3f;private static float MAXSCALER = 3.0f;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_show_picture);//设置为全屏模式getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);ActionBar actionBar=getSupportActionBar();actionBar.hide();Button bt_back = (Button)findViewById(R.id.bt_back);bt_back.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {ShowPicture.this.finish();}});Button bt_del = (Button)findViewById(R.id.bt_save);bt_del.setBackgroundResource(R.drawable.paint_icon_delete);dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm); //获取分辨率img = (ImageView)findViewById(R.id.iv_showPic);Intent intent = this.getIntent();String imgPath = intent.getStringExtra("imgPath");bm = BitmapFactory.decodeFile(imgPath);//设置居中显示savedMatrix.setTranslate((dm.widthPixels - bm.getWidth())/2 , (dm.heightPixels - bm.getHeight()) / 2);img.setImageMatrix(savedMatrix);//绑定图片img.setImageBitmap(bm);//触摸事件img.setOnTouchListener(new TouchEvent());}//添加触摸事件，实现图片的手势缩放class TouchEvent implements View.OnTouchListener {@Overridepublic boolean onTouch(View view, MotionEvent event) {switch(event.getActionMasked()){//单击触控，用于拖动case MotionEvent.ACTION_DOWN :matrix.set(img.getImageMatrix());savedMatrix.set(matrix);start.set(event.getX(), event.getY());mode = DRAG;break;//多点触控，按下时case MotionEvent.ACTION_POINTER_DOWN :oldDist = getSpacing(event);savedMatrix.set(matrix);getMidPoint(mid,event);mode = ZOOM;break;//多点触控，抬起时case MotionEvent.ACTION_POINTER_UP :mode = NONE;break;case MotionEvent.ACTION_MOVE :if(mode == DRAG){matrix.set(savedMatrix);matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);}//缩放else if(mode == ZOOM){//取得多指移动的直径，如果大于10，则认为是缩放手势float newDist = getSpacing(event);if(newDist > 10){matrix.set(savedMatrix);float scale = newDist / oldDist;matrix.postScale(scale, scale,mid.x,mid.y);}}break;}img.setImageMatrix(matrix);controlScale();//setCenter();center();return true;}}//求距离private float getSpacing(MotionEvent event){float x = event.getX(0) - event.getX(1);float y = event.getY(0) - event.getY(1);return (float) Math.sqrt(x * x + y * y);}//求中点private void getMidPoint(PointF mid,MotionEvent event){float x = event.getX(0) + event.getX(1);float y = event.getY(0) + event.getY(1);mid.set(x / 2, y / 2);}//控制缩放比例private void controlScale(){float values[] = new float[9];matrix.getValues(values);if(mode == ZOOM){if(values[0] < MINSCALER)matrix.setScale(MINSCALER, MINSCALER);else if(values[0] > MAXSCALER)matrix.setScale(MAXSCALER, MAXSCALER);}}//自动居中  左右及上下都居中protected void center(){center(true,true);}private void center(boolean horizontal, boolean vertical){Matrix m = new Matrix();m.set(matrix);RectF rect = new RectF(0, 0, bm.getWidth(), bm.getHeight());m.mapRect(rect);float height = rect.height();float width = rect.width();float deltaX = 0, deltaY = 0;if (vertical){int screenHeight = dm.heightPixels;  //手机屏幕分辨率的高度//int screenHeight = 400;if (height < screenHeight){deltaY = (screenHeight - height)/2 - rect.top;}else if (rect.top > 0){deltaY = -rect.top;}else if (rect.bottom < screenHeight){deltaY = screenHeight - rect.bottom;}}if (horizontal){int screenWidth = dm.widthPixels;  //手机屏幕分辨率的宽度//int screenWidth = 400;if (width < screenWidth){deltaX = (screenWidth - width)/2 - rect.left;}else if (rect.left > 0){deltaX = -rect.left;}else if (rect.right < screenWidth){deltaX = screenWidth - rect.right;}}matrix.postTranslate(deltaX, deltaY);}}

ShowRecord

package com.llw.notes;import android.content.Intent;
import android.graphics.drawable.AnimationDrawable;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;public class ShowRecord extends AppCompatActivity {private String audioPath;private int isPlaying = 0;private AnimationDrawable ad_left,ad_right;private Timer mTimer;//语音操作对象private MediaPlayer mPlayer = null;private ImageView iv_record_wave_left,iv_record_wave_right,iv_microphone;private TextView tv_recordTime;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_show_record);//设置为全屏模式getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);ActionBar actionBar=getSupportActionBar();actionBar.hide();Button bt_back = (Button)findViewById(R.id.bt_back);bt_back.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {if(isPlaying == 1){mPlayer.stop();mPlayer.release();}ShowRecord.this.finish();}});Button bt_del = (Button)findViewById(R.id.bt_save);bt_del.setBackgroundResource(R.drawable.paint_icon_delete);iv_microphone = (ImageView)findViewById(R.id.iv_microphone);iv_microphone.setOnClickListener(new ClickEvent());Intent intent = this.getIntent();audioPath = intent.getStringExtra("audioPath");iv_record_wave_left = (ImageView)findViewById(R.id.iv_record_wave_left);iv_record_wave_right = (ImageView)findViewById(R.id.iv_record_wave_right);
//        ad_left = (AnimationDrawable)iv_record_wave_left.getBackground();
//        ad_left = (AnimationDrawable)iv_record_wave_left.getBackground();iv_record_wave_left.setImageResource(R.drawable.record_wave_left);iv_record_wave_right.setImageResource(R.drawable.record_wave_right);ad_left=((AnimationDrawable) iv_record_wave_left.getDrawable());ad_right=((AnimationDrawable) iv_record_wave_right.getDrawable());tv_recordTime = (TextView)findViewById(R.id.tv_recordTime);}final Handler handler = new Handler(){public void handleMessage(Message msg) {switch(msg.what){case 1 :String time[] = tv_recordTime.getText().toString().split(":");int hour = Integer.parseInt(time[0]);int minute = Integer.parseInt(time[1]);int second = Integer.parseInt(time[2]);if(second < 59){second++;}else if(second == 59 && minute < 59){minute++;second = 0;}if(second == 59 && minute == 59 && hour < 98){hour++;minute = 0;second = 0;}time[0] = hour + "";time[1] = minute + "";time[2] = second + "";//调整格式显示到屏幕上if(second < 10)time[2] = "0" + second;if(minute < 10)time[1] = "0" + minute;if(hour < 10)time[0] = "0" + hour;//显示在TextView中tv_recordTime.setText(time[0]+":"+time[1]+":"+time[2]);break;}}};class ClickEvent implements View.OnClickListener {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub//试听if(isPlaying == 0){isPlaying = 1;mPlayer = new MediaPlayer();tv_recordTime.setText("00:00:00");mTimer = new Timer();mPlayer.setOnCompletionListener(new MediaCompletion());try {mPlayer.setDataSource(audioPath);mPlayer.prepare();mPlayer.start();} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SecurityException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalStateException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}mTimer.schedule(new TimerTask() {@Overridepublic void run() {Message message = new Message();message.what = 1;handler.sendMessage(message);}}, 1000,1000);//播放动画ad_left.start();ad_right.start();}//结束试听else{isPlaying = 0;mPlayer.stop();mPlayer.release();mPlayer = null;mTimer.cancel();mTimer = null;//停止动画ad_left.stop();ad_right.stop();}}}class MediaCompletion implements MediaPlayer.OnCompletionListener {@Overridepublic void onCompletion(MediaPlayer mp) {mTimer.cancel();mTimer = null;isPlaying = 0;//停止动画ad_left.stop();ad_right.stop();Toast.makeText(ShowRecord.this, "播放完毕", Toast.LENGTH_SHORT).show();tv_recordTime.setText("00:00:00");}}}

TouchView

package com.llw.notes;import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;import java.util.Timer;
import java.util.TimerTask;public class TouchView extends View {private Bitmap mBitmap,myBitmap;private Canvas mCanvas;private Path mPath;private Paint mBitmapPaint;private Paint mPaint;private Handler bitmapHandler;GetCutBitmapLocation getCutBitmapLocation;private Timer timer;DisplayMetrics dm;private int w,h;private int currentColor = Color.RED;private int currentSize = 5;//画笔颜色private int[] paintColor = {Color.RED,Color.BLUE,Color.BLACK,Color.GREEN,Color.YELLOW,Color.CYAN,Color.LTGRAY};//设置画笔样式public void setPaintStyle(){mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setDither(true);mPaint.setStyle(Paint.Style.STROKE);mPaint.setStrokeJoin(Paint.Join.ROUND);mPaint.setStrokeCap(Paint.Cap.ROUND);mPaint.setStrokeWidth(currentSize);mPaint.setColor(currentColor);}//设置画笔的大小public void selectHandWritetSize(int which){int size =Integer.parseInt(this.getResources().getStringArray(R.array.paintsize)[which]);currentSize = size;setPaintStyle();}//设置画笔颜色public void selectHandWriteColor(int which){currentColor = paintColor[which];setPaintStyle();}public TouchView(Context context) {super(context);dm = new DisplayMetrics();((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(dm);w = dm.widthPixels;h = dm.heightPixels;initPaint();}public TouchView(Context context, AttributeSet attrs) {super(context,attrs);dm = new DisplayMetrics();((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(dm);w = dm.widthPixels;h = dm.heightPixels;initPaint();}//设置handlerpublic void setHandler(Handler mBitmapHandler){bitmapHandler = mBitmapHandler;}//初始化画笔，画布private void initPaint(){//设置画笔样式setPaintStyle();getCutBitmapLocation = new GetCutBitmapLocation();//画布大小mBitmap = Bitmap.createBitmap(w, h,Bitmap.Config.ARGB_8888);mCanvas = new Canvas(mBitmap);  //所有mCanvas画的东西都被保存在了mBitmap中mCanvas.drawColor(Color.TRANSPARENT);mPath = new Path();mBitmapPaint = new Paint(Paint.DITHER_FLAG);timer = new Timer(true);}/*** 处理屏幕显示*/Handler handler = new Handler(){public void handleMessage(Message msg) {switch (msg.what) {case 1:myBitmap = getCutBitmap(mBitmap);Message message = new Message();message.what=1;Bundle bundle = new Bundle();;bundle.putParcelable("bitmap",myBitmap);message.setData(bundle);bitmapHandler.sendMessage(message);RefershBitmap();break;}super.handleMessage(msg);}};/*** 发送消息给handler更新ACTIVITY*/TimerTask task = new TimerTask() {public void run() {Message message = new Message();message.what=1;Log.i("线程", "来了");handler.sendMessage(message);}};//切割画布中的字并返回public Bitmap getCutBitmap(Bitmap mBitmap){//得到手写字的四周位置，并向外延伸10pxfloat cutLeft = getCutBitmapLocation.getCutLeft() - 10;float cutTop = getCutBitmapLocation.getCutTop() - 10;float cutRight = getCutBitmapLocation.getCutRight() + 10;float cutBottom = getCutBitmapLocation.getCutBottom() + 10;cutLeft = (0 > cutLeft ? 0 : cutLeft);cutTop = (0 > cutTop ? 0 : cutTop);cutRight = (mBitmap.getWidth() < cutRight ? mBitmap.getWidth() : cutRight);cutBottom = (mBitmap.getHeight() < cutBottom ? mBitmap.getHeight() : cutBottom);//取得手写的的高度和宽度float cutWidth = cutRight - cutLeft;float cutHeight = cutBottom - cutTop;Bitmap cutBitmap = Bitmap.createBitmap(mBitmap, (int)cutLeft, (int)cutTop, (int)cutWidth, (int)cutHeight);if (myBitmap!=null ) {myBitmap.recycle();myBitmap= null;}return cutBitmap;}//刷新画布private void RefershBitmap(){initPaint();invalidate();if(task != null)task.cancel();}@Overrideprotected void onDraw(Canvas canvas) {canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);     //显示旧的画布canvas.drawPath(mPath, mPaint);  //画最后的path}private float mX, mY;private static final float TOUCH_TOLERANCE = 4;//手按下时private void touch_start(float x, float y) {mPath.reset();//清空pathmPath.moveTo(x, y);mX = x;mY = y;if(task != null)task.cancel();//取消之前的任务task = new TimerTask() {@Overridepublic void run() {Message message = new Message();message.what=1;Log.i("线程", "来了");handler.sendMessage(message);}};getCutBitmapLocation.setCutLeftAndRight(mX,mY);}//手移动时private void touch_move(float x, float y) {float dx = Math.abs(x - mX);float dy = Math.abs(y - mY);if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {mPath.quadTo(mX, mY, x, y);// mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);//源代码是这样写的，可是我没有弄明白，为什么要这样？mX = x;mY = y;if(task != null)task.cancel();//取消之前的任务task = new TimerTask() {@Overridepublic void run() {Message message = new Message();message.what=1;Log.i("线程", "来了");handler.sendMessage(message);}};getCutBitmapLocation.setCutLeftAndRight(mX,mY);}}//手抬起时private void touch_up() {//mPath.lineTo(mX, mY);mCanvas.drawPath(mPath, mPaint);mPath.reset();if (timer!=null) {if (task!=null) {task.cancel();task = new TimerTask() {public void run() {Message message = new Message();message.what = 1;handler.sendMessage(message);}};timer.schedule(task, 1000, 1000);               //2200秒后发送消息给handler更新Activity}}else {timer = new Timer(true);timer.schedule(task, 1000, 1000);                    //2200秒后发送消息给handler更新Activity}}//处理界面事件@Overridepublic boolean onTouchEvent(MotionEvent event) {float x = event.getX();float y = event.getY();switch (event.getAction()) {//down表示手势事件开始，up表示结束，move则代表着过程case MotionEvent.ACTION_DOWN:touch_start(x, y);invalidate(); //刷新break;case MotionEvent.ACTION_MOVE:touch_move(x, y);invalidate();break;case MotionEvent.ACTION_UP:touch_up();invalidate();break;}return true;}}

3,最后res中drawable文件layout文件values文件粘贴上去就行了

功能可以看代码注释，不会可以在评论区提问我会解答。
本程序大家供学习使用。
我把源代码发到github上方便大家看代码学习：
网址：https://github.com/Rockffer/notes/tree/master

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