/**
* Decodes a bitmap from a file containing it minimizing the memory use, known that the bitmap
* will be drawn in a surface of reqWidth x reqHeight
*
* @param srcPath Absolute path to the file containing the image.
* @param reqWidth Width of the surface where the Bitmap will be drawn on, in pixels.
* @param reqHeight Height of the surface where the Bitmap will be drawn on, in pixels.
* @return
*/
public static Bitmap decodeSampledBitmapFromFile(String srcPath, int reqWidth, int reqHeight) {
// set desired options that will affect the size of the bitmap
final Options options = new Options();
options.inScaled = true;
options.inPurgeable = true;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
options.inPreferQualityOverSpeed = false;
}
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) {
options.inMutable = false;
}
// make a false load of the bitmap to get its dimensions
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(srcPath, options);
// calculate factor to subsample the bitmap
options.inSampleSize = calculateSampleFactor(options, reqWidth, reqHeight);
// decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(srcPath, options);
}
@TargetApi(10)
private void copyOptions10(Options srcOptions, Options destOptions) {
destOptions.inPreferQualityOverSpeed = srcOptions.inPreferQualityOverSpeed;
}