系统相机 系统相册 裁剪【示例】

public class MainActivity extends ListActivity {
   public static final String fileSavePath = Environment.getExternalStorageDirectory().getPath() + File.separator;
   public static final String tempFileSavePath = fileSavePath + "temp.png";
   public static final String tempCropFileSavePath = fileSavePath + "temp_crop.png";
   public static final int REQUEST_CODE_0 = 1100;
   public static final int REQUEST_CODE_1 = 1101;
   public static final int REQUEST_CODE_11 = 1111;
   public static final int REQUEST_CODE_12 = 1112;
   public static final int REQUEST_CODE_4 = 1104;
   public static final int REQUEST_CODE_5 = 1105;
   private TextView tv;
   private ImageView iv;
   private boolean isCrop;
   private boolean isSaveToUri;

   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      String[] array = {"使用相机拍照并获取返回的照片\n注意返回的并非原图，照片会自动被压缩", //
            "使用相机拍照并将照片保存在指定的位置\n注意这时在指定位置保存的是原图",//
            "调用系统图库APP的裁剪图片功能，将图片裁剪为指定大小\n将裁剪后的图片通过onActivityResult返回",//
            "调用系统图库APP的裁剪图片功能，将图片裁剪为指定大小\n将裁剪后的照片保存在指定的位置",//
            "从系统图库APP中获取图片，这里获取的是原图",//
            "从系统图库APP中获取图片，并将照片裁剪为指定大小\n将裁剪后的图片通过onActivityResult返回",//
            "从系统图库APP中获取图片，并将照片裁剪为指定大小\n将裁剪后的照片保存在指定的位置",};
      for (int i = 0; i < array.length; i++) {
         array[i] = i + "、" + array[i];
      }
      iv = new ImageView(this);
      //iv.setScaleType(ImageView.ScaleType.CENTER_CROP);
      getListView().addFooterView(iv);
      tv = new TextView(this);
      tv.setTextColor(Color.BLUE);
      getListView().addFooterView(tv);
      setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, new ArrayList<String>(Arrays.asList(array))));
   }

   @Override
   protected void onListItemClick(ListView l, View v, int position, long id) {
      switch (position) {
         case 0:
         case 1:
         case 2:
         case 3:
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//调用系统相机拍照
            if (position == 0) startActivityForResult(intent, REQUEST_CODE_0);
            else {//将返回的数据保存到指定位置
               isCrop = (position >= 2);//裁剪
               isSaveToUri = (position == 3);
               intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(tempFileSavePath)));
               startActivityForResult(intent, REQUEST_CODE_1);
            }
            break;
         case 4:
         case 5:
         case 6:
            isCrop = (position >= 5);//裁剪
            Intent intent2 = new Intent(Intent.ACTION_PICK);
            intent2.setType("image/*");
            if (position == 4) startActivityForResult(intent2, REQUEST_CODE_4);
            else {
               isSaveToUri = (position == 6);
               startActivityForResult(intent2, REQUEST_CODE_5);
            }
            break;
      }
   }

   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
      if (resultCode == RESULT_CANCELED) {//0
         Toast.makeText(this, "结果码：" + requestCode + "   RESULT_CANCELED", Toast.LENGTH_SHORT).show();
         return;
      } else if (resultCode == RESULT_OK) {//-1
         Toast.makeText(this, "结果码：" + requestCode + "   RESULT_OK", Toast.LENGTH_SHORT).show();
      }
      //
      //*******************************************************************************************************************
      //
      switch (requestCode) {
         case REQUEST_CODE_0:// 注意，返回的并非原图，照片会自动被压缩！
            Bitmap bitmap = (Bitmap) data.getExtras().get("data");
            if (bitmap != null) {
               tv.append("返回的Bitmap的尺寸为" + bitmap.getWidth() + " * " + bitmap.getHeight() + "\n");
               iv.setImageBitmap(bitmap);
            }
            break;
         case REQUEST_CODE_1://注意，这里返回的data为null，这时在指定位置保存的是原图
            tv.append("已将Bitmap保存到指定位置，此时 data == null : " + (data == null) + "\n");
            Bitmap bitmap1 = BitmapFactory.decodeFile(tempFileSavePath);
            if (bitmap1 != null) {
               iv.setImageBitmap(bitmap1);
               tv.append("裁剪前的Bitmap的尺寸为" + bitmap1.getWidth() + " * " + bitmap1.getHeight() + "\n");
               if (isCrop) {
                  Uri fromUri = Uri.fromFile(new File(tempFileSavePath));
                  if (!isSaveToUri) cropImage(this, REQUEST_CODE_11, fromUri);
                  else {
                     Uri toUri = Uri.fromFile(new File(tempCropFileSavePath));
                     cropImage(this, REQUEST_CODE_12, fromUri, toUri);
                  }
               }
            }
            break;
         //
         //*******************************************************************************************************************
         //
         case REQUEST_CODE_4:
         case REQUEST_CODE_5:
            try {
               Uri fromUri = data.getData();
               Bitmap bitmap4 = MediaStore.Images.Media.getBitmap(getContentResolver(), fromUri);
               if (bitmap4 != null) {
                  tv.append("返回的Bitmap的尺寸为" + bitmap4.getWidth() + " * " + bitmap4.getHeight() + "\n");
                  if (!isCrop) iv.setImageBitmap(bitmap4);
                  else {
                     if (!isSaveToUri) cropImage(this, REQUEST_CODE_11, fromUri);
                     else {
                        Uri toUri = Uri.fromFile(new File(tempCropFileSavePath));
                        cropImage(this, REQUEST_CODE_12, fromUri, toUri);
                     }
                  }
               }
            } catch (IOException e) {
               e.printStackTrace();
            }
            break;
         //
         //*******************************************************************************************************************
         //
         case REQUEST_CODE_11: // 将裁剪后的图片通过onActivityResult中的Intent返回
            Bitmap bitmap5 = (Bitmap) data.getParcelableExtra("data");
            if (bitmap5 != null) {
               tv.append("裁剪后的Bitmap的尺寸为" + bitmap5.getWidth() + " * " + bitmap5.getHeight() + "\n");
               iv.setImageBitmap(bitmap5);
            }
            break;
         case REQUEST_CODE_12: //将裁剪后的图片通过指定的Uri返回
            try {
               Uri tempCropFileUri = Uri.fromFile(new File(tempCropFileSavePath));
               Bitmap bitmap6 = MediaStore.Images.Media.getBitmap(getContentResolver(), tempCropFileUri);
               tv.append("指定Uri后裁剪后的尺寸为" + bitmap6.getWidth() + " * " + bitmap6.getHeight() + "\n");
               iv.setImageBitmap(bitmap6);
            } catch (IOException e) {
               e.printStackTrace();
            }
            break;
      }
   }

   /**
    * 调用系统图库APP的裁剪图片功能，将指定Uri中的图片裁剪为指定大小
    */
   public static void cropImage(Activity activity, int requestCode, Uri fromUri) {
      cropImage(activity, requestCode, fromUri, 144, 144, null);
   }

   /**
    * 将裁剪后的照片保存在指定的位置
    */
   public static void cropImage(Activity activity, int requestCode, Uri fromUri, Uri toUri) {
      cropImage(activity, requestCode, fromUri, 144, 144, toUri);
   }

   /**
    * 调用系统图库APP的裁剪图片功能，将指定图片裁剪为指定大小
    */
   public static void cropImage(Activity activity, int requestCode, Uri fromUri, int desWidth, int desHeight, Uri toUri) {
      if (fromUri == null) return;
      //指定action是使用系统图库裁剪图片
      Intent intent = new Intent("com.android.camera.action.CROP");
      intent.setDataAndType(fromUri, "image/*");
      //设置在开启的Intent中，显示的VIEW可裁剪
      intent.putExtra("crop", "true");
      //设置裁剪比例及裁剪图片的具体宽高
      intent.putExtra("aspectX", 1);
      intent.putExtra("aspectY", 1);
      intent.putExtra("outputX", desWidth);
      intent.putExtra("outputY", desHeight);
      //设置是否允许拉伸
      intent.putExtra("scale", true);
      intent.putExtra("scaleUpIfNeeded", true);
      //设置输出格式
      intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
      //设置是否需要人脸识别，默认不需要设置
      intent.putExtra("noFaceDetection", true);
      //设置是否返回数据
      if (toUri == null) {
         //如果设置为true，那么便不会在给定的uri中获取到裁剪的图片，这里是将数据返回到了onActivityResult中的intent中了
         intent.putExtra("return-data", true);
      } else {
         //如果要在给定的uri中返回图片，则必须设置为false。注意：要防止裁减前图片的uri与保存时图片的uri相同
         intent.putExtra("return-data", false);
         intent.putExtra(MediaStore.EXTRA_OUTPUT, toUri);
      }
      activity.startActivityForResult(intent, requestCode);
   }
}