After a few days struggling to avoid all OutOfMemory errors that I was getting with different devices, I create this:
private Bitmap getDownsampledBitmap(Context ctx, Uri uri, int targetWidth, int targetHeight) {
Bitmap bitmap = null;
try {
BitmapFactory.Options outDimens = getBitmapDimensions(uri);
int sampleSize = calculateSampleSize(outDimens.outWidth, outDimens.outHeight, targetWidth, targetHeight);
bitmap = downsampleBitmap(uri, sampleSize);
} catch (Exception e) {
//handle the exception(s)
}
return bitmap;
}
private BitmapFactory.Options getBitmapDimensions(Uri uri) throws FileNotFoundException, IOException {
BitmapFactory.Options outDimens = new BitmapFactory.Options();
outDimens.inJustDecodeBounds = true; // the decoder will return null (no bitmap)
InputStream is= getContentResolver().openInputStream(uri);
// if Options requested only the size will be returned
BitmapFactory.decodeStream(is, null, outDimens);
is.close();
return outDimens;
}
private int calculateSampleSize(int width, int height, int targetWidth, int targetHeight) {
int inSampleSize = 1;
if (height > targetHeight || width > targetWidth) {
// Calculate ratios of height and width to requested height and
// width
final int heightRatio = Math.round((float) height
/ (float) targetHeight);
final int widthRatio = Math.round((float) width / (float) targetWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
private Bitmap downsampleBitmap(Uri uri, int sampleSize) throws FileNotFoundException, IOException {
Bitmap resizedBitmap;
BitmapFactory.Options outBitmap = new BitmapFactory.Options();
outBitmap.inJustDecodeBounds = false; // the decoder will return a bitmap
outBitmap.inSampleSize = sampleSize;
InputStream is = getContentResolver().openInputStream(uri);
resizedBitmap = BitmapFactory.decodeStream(is, null, outBitmap);
is.close();
return resizedBitmap;
}
This method works with all devices I tested, but I think the quality can be better using other process that I'm not aware.
I hope my code can help other developers in the same situation. I also appreciate if a senior developer can help, giving a suggestion about other process to avoid lose (less) quality in the process.