Android实现从相册截图的功能

private

static 
final 
String IMAGE_FILE_LOCATION = "file:///sdcard/temp.jpg";//temp
 file

Uri
 imageUri = Uri.parse(IMAGE_FILE_LOCATION);//The
 Uri to store the big bitmap

Intent
 intent = new

Intent(Intent.ACTION_GET_CONTENT, null);

intent.setType("image/*");

intent.putExtra("crop",
"true");

intent.putExtra("aspectX",
2);

intent.putExtra("aspectY",
1);

intent.putExtra("outputX",
600);

intent.putExtra("outputY",
300);

intent.putExtra("scale",
true);

intent.putExtra("return-data",
false);

intent.putExtra(MediaStore.EXTRA_OUTPUT,
 imageUri);

intent.putExtra("outputFormat",
 Bitmap.CompressFormat.JPEG.toString());

intent.putExtra("noFaceDetection",
true);
//
 no face detection

startActivityForResult(intent,
 CHOOSE_BIG_PICTURE);

Intent
 intent = new

Intent(Intent.ACTION_GET_CONTENT, null);

intent.setType("image/*");

intent.putExtra("crop",
"true");

intent.putExtra("aspectX",
2);

intent.putExtra("aspectY",
1);

intent.putExtra("outputX",
200);

intent.putExtra("outputY",
100);

intent.putExtra("scale",
true);

intent.putExtra("return-data",
true);

intent.putExtra("outputFormat",
 Bitmap.CompressFormat.JPEG.toString());

intent.putExtra("noFaceDetection",
true);
//
 no face detection

startActivityForResult(intent,
 CHOOSE_SMALL_PICTURE);

switch

(requestCode) {

case

CHOOSE_BIG_PICTURE:

  Log.d(TAG,
"CHOOSE_BIG_PICTURE:
 data = " 
+ data);//it
 seems to be null

  if(imageUri
 != null){

    Bitmap
 bitmap = decodeUriAsBitmap(imageUri);//decode
 bitmap

    imageView.setImageBitmap(bitmap);

  }

  break;

case

CHOOSE_SMALL_PICTURE:

  if(data
 != null){

    Bitmap
 bitmap = data.getParcelableExtra("data");

    imageView.setImageBitmap(bitmap);

  }else{

    Log.e(TAG,
"CHOOSE_SMALL_PICTURE:
 data = " 
+ data);

  }

  break;

default:

  break;

}


private

Bitmap decodeUriAsBitmap(Uri uri){

  Bitmap
 bitmap = null;

  try

{

    bitmap
 = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));

  }
catch

(FileNotFoundException e) {

    e.printStackTrace();

    return

null;

  }

  return

bitmap;

}