Android便签开发源码

Android 便签开发源码

首先我们来看一下app截图：

因为代码比较多，这里我把主要的代码贴出来，
源码链接：https://download.csdn.net/download/qq_40748996/11202859
GitHub：https://github.com/bbcode1/Notepad
程序结构图

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:fitsSystemWindows="true"tools:context="com.example.notes_2.MainActivity"><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"><android.support.design.widget.AppBarLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:theme="@style/AppTheme.AppBarOverlay"android:id="@+id/aaa"><android.support.v7.widget.Toolbarandroid:id="@+id/toolbar"android:layout_width="match_parent"android:layout_height="?attr/actionBarSize"android:background="?attr/colorPrimary"app:popupTheme="@style/AppTheme.PopupOverlay" /></android.support.design.widget.AppBarLayout><ListViewandroid:layout_below="@+id/aaa"android:id="@+id/listview_title"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1"></ListView><android.support.design.widget.FloatingActionButtonandroid:id="@+id/fab"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="bottom|end"android:src="@android:drawable/ic_menu_add"android:layout_marginLeft="@dimen/fab_margin"android:layout_marginRight="@dimen/fab_margin"android:layout_alignBottom="@+id/listview_title"android:layout_centerHorizontal="true" /></RelativeLayout>
</android.support.design.widget.CoordinatorLayout>

content.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><LinearLayoutandroid:orientation="horizontal"android:layout_width="fill_parent"android:layout_height="wrap_content"android:background="@color/colorPrimary"><Buttonandroid:id="@+id/btn_ok"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="完成"android:background="@color/colorPrimary"/><TextClockandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center"android:format12Hour="yyyy年dd月MM日 HH:mm"/><Buttonandroid:id="@+id/btn_cancle"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="取消"android:background="@color/colorPrimary"/></LinearLayout><EditTextandroid:id="@+id/et_content"android:layout_width="fill_parent"android:layout_height="match_parent"android:hint="Type something here"/></LinearLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"app:layout_behavior="@string/appbar_scrolling_view_behavior"tools:context="com.example.notes_2.MainActivity"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:paddingLeft="10sp"android:paddingRight="10sp"android:id="@+id/time" /><TextViewandroid:id="@+id/content"android:layout_below="@+id/time"android:layout_width="wrap_content"android:layout_height="wrap_content"android:singleLine="true"android:ellipsize="end"android:paddingLeft="10sp"android:paddingRight="10sp"android:paddingTop="15sp"android:paddingBottom="15sp" />
</RelativeLayout>

modify.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><LinearLayoutandroid:orientation="horizontal"android:layout_width="fill_parent"android:layout_height="wrap_content"android:background="@color/colorPrimary"><Buttonandroid:id="@+id/btn_update"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="保存"android:background="@color/colorPrimary"/><TextClockandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="1"android:format12Hour="yyyy年dd月MM日 HH:mm"/><Buttonandroid:id="@+id/btn_back"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="返回"android:background="@color/colorPrimary"/><Buttonandroid:id="@+id/btn_delete"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="1"android:text="删除"android:background="@color/colorPrimary"/></LinearLayout><EditTextandroid:id="@+id/et_modify"android:layout_width="fill_parent"android:layout_height="match_parent"/></LinearLayout>

Content.java

package com.example.notes_2;import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;import java.sql.Time;
import java.text.SimpleDateFormat;
import java.util.Date;public class Content extends Activity implements View.OnClickListener {private Button okButton,cancleButton;private EditText contentWrite;private DBHelper dbHelper;private Cursor cursor;private int _id=0;private Time time;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.content);SimpleDateFormat   formatter=new SimpleDateFormat("yyyy年MM月dd日   HH:mm:ss");Date curDate =  new Date(System.currentTimeMillis());String string=formatter.format(curDate);Log.e("0",string);init();}private void init(){dbHelper=new DBHelper(this);cursor=dbHelper.select();okButton = (Button) findViewById(R.id.btn_ok);cancleButton = (Button) findViewById(R.id.btn_cancle);contentWrite = (EditText) findViewById(R.id.et_content);okButton.setOnClickListener(this);cancleButton.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btn_ok:addData() ;Intent intent = new Intent(this,MainActivity.class);startActivity(intent);finish();break;case R.id.btn_cancle:Intent intent1 = new Intent(this,MainActivity.class);startActivity(intent1);finish();break;}}private void addData(){if (contentWrite.getText().toString().equals("")){Toast.makeText(Content.this,"内容不能为空",Toast.LENGTH_SHORT).show();}else{dbHelper.insert(contentWrite.getText().toString());cursor.requery();contentWrite.setText("");_id=0;}}
}

DBHelper.java

package com.example.notes_2;import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;public class DBHelper extends SQLiteOpenHelper {private final static String DB_NAME="my.db";private final static int DB_VERSION=1;private final  static String TABLE_NAME="info";private final static String CONTENT="content";private final static String ID="_id";SQLiteDatabase database=getWritableDatabase();public DBHelper(Context context){super(context,DB_NAME,null,DB_VERSION);}@Overridepublic void onCreate(SQLiteDatabase database){database.execSQL("create table " + TABLE_NAME + "(" + ID + " integer primary key autoincrement," + CONTENT + " text)");}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}public long insert(String text){ContentValues contentValues=new ContentValues();contentValues.put("content",text);long row=database.insert(TABLE_NAME,null,contentValues);return row;}public void update(int _id,String text){ContentValues contentValues=new ContentValues();contentValues.put("content",text);database.update(TABLE_NAME,contentValues,ID+"=?",new String[]{Integer.toString(_id)});}public void delete(int _id){database.delete(TABLE_NAME, ID + "=?", new String[]{Integer.toString(_id)});}public Cursor select(){Cursor cursor=database.query(TABLE_NAME,null,null,null,null,null,null);return cursor;}
}

MainActivity.java

package com.example.notes_2;import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;public class MainActivity extends AppCompatActivity {private ListView listView;private Cursor cursor;private DBHelper dbHelper;private int _id=0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);dbHelper=new DBHelper(this);cursor=dbHelper.select();listView=(ListView)findViewById (R.id.listview_title);SimpleCursorAdapter adapter=new SimpleCursorAdapter(this,R.layout.list_item,cursor, new String[]{"content"},new int[]{R.id.content});listView.setAdapter(adapter);listView.invalidateViews();listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position, long id) {cursor.moveToPosition(position);_id=cursor.getInt(0);Intent intent=new Intent(MainActivity.this,Modify.class);intent.putExtra("id",_id);intent.putExtra("data",cursor.getString(1));//getString(1)显示cursor该列的内容startActivity(intent);finish();}});Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);setSupportActionBar(toolbar);FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);fab.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Intent intent = new Intent(MainActivity.this,Content.class);startActivity(intent);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.menu_main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();//noinspection SimplifiableIfStatementif (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}
}

Modify.java

package com.example.notes_2;import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;public class Modify extends Activity implements View.OnClickListener {private EditText et_show;private Button updateButton, deleteButton, backButton;private DBHelper dbHelper;private Cursor cursor;private int id;@Overrideprotected void onCreate(Bundle s) {super.onCreate(s);setContentView(R.layout.modify);init();}private void init() {et_show = (EditText) findViewById(R.id.et_modify);Intent intent = getIntent();String data = intent.getStringExtra("data");id = intent.getIntExtra("id", id);et_show.setText(data);dbHelper = new DBHelper(this);cursor = dbHelper.select();updateButton = (Button) findViewById(R.id.btn_update);deleteButton = (Button) findViewById(R.id.btn_delete);backButton = (Button) findViewById(R.id.btn_back);updateButton.setOnClickListener(this);deleteButton.setOnClickListener(this);backButton.setOnClickListener(this);}public void updateData() {if (id == 0) {Toast.makeText(Modify.this, "内容不能为空", Toast.LENGTH_SHORT).show();} else {dbHelper.update(id, et_show.getText().toString());cursor.requery();id = 0;}}public void deleteData(){if (id==0){Toast.makeText(Modify.this, "内容不能为空", Toast.LENGTH_SHORT).show();}else{dbHelper.delete(id);cursor.requery();id=0;}}@Overridepublic void onClick(View arg0) {switch (arg0.getId()) {case R.id.btn_update:updateData();Intent intent1 = new Intent(this,MainActivity.class);startActivity(intent1);finish();break;case R.id.btn_delete:deleteData();Intent intent = new Intent(this,MainActivity.class);startActivity(intent);finish();break;case R.id.btn_back:Intent intent2 = new Intent(this,MainActivity.class);startActivity(intent2);finish();break;}}
}

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