android头像设置

运行效果图：点击拍照或者图片库获取头像

但是在anroid4.4版本前后的写法有点不同，可能出现问题。

1、关于拍照调用Intent问题

在4.4版本前可以写成这样：

Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
intent.setType("image/*");
activity.startActivityForResult(intent, START_ALBUM_CODE);

或者：

Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
"image/*");
activity.startActivityForResult(intent, START_ALBUM_CODE);

但在4.4版本后就要写成这样了。

Intent intent = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*");
activity.startActivityForResult(intent, START_ALBUM_CODE);

2、拍照后保存到sd卡路径问题：

1、保存在sd卡中:sdcard/的路径下
Environment.getExternalStorageDirectory().getAbsolutePath();

2、保存到sd卡下面应用包中：getExternalFilesDir(“/photo”) + “”;这种保存方式可以使卸载应用时，同时也把文件删除，减少sd卡中缓存的垃圾文件。

getExternalFilesDir()：一般保存长久文件

getExternalCacheDir()：一般保存临时文件

它们的全路径：/storage/emulated/0/Android/data/包名/files/photo

3、头像设置的工作：

从图片库，或者拍照得到图片；
图片剪切
压缩保存图片到本地，并上传服务器
显示图片时，首先从本地得到。

4、关于图片压缩问题：

bitmap.compress(CompressFormat.JPEG, 70, fos);

0-100.
0 meaning compress for small size,
100 meaning compress for max quality.

quality为图像压缩比的值,0-100.0 意味着小尺寸压缩,100意味着高质量压缩
测试在一张比较小的图片下测试结果：

在保存图片为jpg的情况下：
值图片大小
0: ——1.34k 图片几乎没办法看，很模糊；
75:——6.67k
100:——24.8k
在保存图片为png的情况下
0: ——–39.38k
75: ——–39.38k
100：—— 39.38k
代码如下：

package com.example.photodemo;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.media.ThumbnailUtils;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;public class MainActivity extends Activity {private static final int PICK_REQUEST_CODE = 0;private static final int CAMERA_REQUEST_CODE = 1;private static final int ZOOM_REQUEST_CODE = 2;private static final String IMAGE_FILE_NAME = "photo.jpg";private ImageView iv_icon;private String[] items = new String[] { "拍照", "图片库" };public static final String TAG = "MainActivity";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);iv_icon = (ImageView) findViewById(R.id.iv_icon);// 首先判断本地中有没有保存图片：如果没有图片，显示默认图片；File file = getExternalFilesDir("/photo");String url = file + "/icon.png";Bitmap b = BitmapFactory.decodeFile(url);if (b != null) {iv_icon.setImageBitmap(b);}iv_icon.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubshowDialog();}});}private void showDialog() {// TODO Auto-generated method stubnew AlertDialog.Builder(this).setTitle("选择头像").setItems(items, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubswitch (which) {case 0:if (BitmapUtils.isSdcardExisting()) {Intent intent_camera = new Intent("android.media.action.IMAGE_CAPTURE");intent_camera.putExtra(MediaStore.EXTRA_OUTPUT,getImageUri());intent_camera.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);startActivityForResult(intent_camera,CAMERA_REQUEST_CODE);} else {Toast.makeText(MainActivity.this, "请插入sd卡",Toast.LENGTH_SHORT).show();}break;case 1:Intent intent_gallery = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);intent_gallery.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*");startActivityForResult(intent_gallery,PICK_REQUEST_CODE);break;}}}).show();}// 在从拍照或者图片啼选择后返回@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (resultCode != RESULT_OK) {return;} else {switch (requestCode) {case PICK_REQUEST_CODE:// 从图片啼选择图片后，直接返回的是uri，然后对通过uri取得图片，进行剪切；startPhotoZoom(data.getData());break;case CAMERA_REQUEST_CODE:// 首先判断sd卡是否挂载；if (BitmapUtils.isSdcardExisting()) {startPhotoZoom(getImageUri());} else {Toast.makeText(MainActivity.this, "未找到存储卡，无法存储照片！",Toast.LENGTH_LONG).show();}break;// 启动剪切图片；case ZOOM_REQUEST_CODE:if (data != null) {showImage(data);}break;}}super.onActivityResult(requestCode, resultCode, data);}// 对图片进行剪切；public void startPhotoZoom(Uri uri) {Intent intent = new Intent("com.android.camera.action.CROP");intent.setDataAndType(uri, "image/*");intent.putExtra("crop", "true");intent.putExtra("aspectX", 1);intent.putExtra("aspectY", 1);intent.putExtra("outputX", 150);intent.putExtra("outputY", 150);intent.putExtra("return-data", true);startActivityForResult(intent, ZOOM_REQUEST_CODE);}// 最张显示图片；但是在实际中，在进入activity中要判断sd卡中是否有图片，如果有图片要首先显示图片。// 把图片保存到本地，并且上传给服务器；private void showImage(Intent data) {Bundle extras = data.getExtras();if (extras != null) {Bitmap photo = extras.getParcelable("data");Bitmap photo_round = BitmapUtils.getRoundedCornerBitmap(photo,10.0f);// saveServer();保存到服务器；// saveSD();保存到sd卡;// 显示在界面中；BitmapUtils.saveToSDBitmap(MainActivity.this, "icon.png",photo_round);iv_icon.setImageBitmap(photo_round);}}private Uri getImageUri() {return Uri.fromFile(new File(Environment.getExternalStorageDirectory(),IMAGE_FILE_NAME));}
}

工具类代码

package com.example.photodemo;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.BitmapFactory;
import android.os.Environment;public class BitmapUtils {private static String sdState = Environment.getExternalStorageState();private static String path = Environment.getExternalStorageDirectory().toString();public static final String PHTOT_NAME = "/PHOTO";/*** 把图片保存到sd卡中，保存的路径为storage/PHOTO;* * @param bitmap* @param imageName*/public static void saveBitmap(Bitmap bitmap, String imageName) {File file;File PicName;if (sdState.equals(Environment.MEDIA_MOUNTED)) {// 获得sd卡根目录file = new File(path + PHTOT_NAME);if (!file.exists()) {file.mkdirs();}PicName = new File(file, imageName);try {if (!PicName.exists()) {PicName.createNewFile();}FileOutputStream fos = new FileOutputStream(PicName);if (PicName.getName().endsWith(".png")) {bitmap.compress(CompressFormat.PNG, 70, fos);} else if (PicName.getName().endsWith(".jpg")) {bitmap.compress(CompressFormat.JPEG, 70, fos);}fos.flush();fos.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}/*** 从sd卡中取出图片；* * @param imageName* @return*/public static Bitmap getBitmap(String imageName) {Bitmap bitmap = null;File imagePic;if (sdState.equals(Environment.MEDIA_MOUNTED)) {imagePic = new File(path + PHTOT_NAME, imageName);if (imagePic.exists()) {try {bitmap = BitmapFactory.decodeStream(new FileInputStream(imagePic));} catch (FileNotFoundException e) {// e.printStackTrace();}}}return bitmap;}/*** 删除sd卡上的图片；* * @param file*/public static void deleteFile(File file) {if (sdState.equals(Environment.MEDIA_MOUNTED)) {if (file.exists()) {if (file.isFile()) {file.delete();}// 如果它是一个目录else if (file.isDirectory()) {// 声明目录下所有的文件 files[];File files[] = file.listFiles();for (int i = 0; i < files.length; i++) { // 遍历目录下所有的文件deleteFile(files[i]); // 把每个文件 用这个方法进行迭代}}file.delete();}}}/*** 把文本保存到SDCard/Android/data/你的应用的包名/files/ 目录下，当卸载应用的时候删除；* * @param context* @param fileName* @param text*/public static void savetoSDText(Context context, String fileName,String text) {// TODO Auto-generated method stubFile file = context.getExternalFilesDir("/photo");try {FileOutputStream fos = new FileOutputStream(file + "/" + fileName);fos.write(text.getBytes());fos.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}/*** 把图片保存SDCard/Android/data/你的应用的包名/files/ 目录下 当卸载应用的时候删除* * @param context* @param fileName* @param bitmap*/public static void saveToSDBitmap(Context context, String fileName,Bitmap bitmap) {File file = context.getExternalFilesDir("/photo");try {FileOutputStream fos = new FileOutputStream(file + "/" + fileName);bitmap.compress(CompressFormat.PNG, 75, fos);fos.flush();fos.close();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO: handle exceptione.printStackTrace();}}/*** 得到圆角图片； bitmap:传入图片 roundPx :传入显示的圆角弧度，一般设置10.0就可以*/private static Bitmap output;public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {if (bitmap != null) {output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),Config.ARGB_8888);Canvas canvas = new Canvas(output);final int color = 0xff424242;final Paint paint = new Paint();final Rect rect = new Rect(0, 0, bitmap.getWidth(),bitmap.getHeight());final RectF rectF = new RectF(rect);paint.setAntiAlias(true);canvas.drawARGB(0, 0, 0, 0);paint.setColor(color);canvas.drawRoundRect(rectF, roundPx, roundPx, paint);paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));canvas.drawBitmap(bitmap, rect, rect, paint);}return output;}/*** * 判断sd卡是否可用；* * @return*/public static boolean isSdcardExisting() {final String state = Environment.getExternalStorageState();if (state.equals(Environment.MEDIA_MOUNTED)) {return true;} else {return false;}}
}

demo下载地址：http://download.csdn.net/detail/androidxiaogang/9284309