I have an ImageView and I need to getImageResource() based on user GPS position. There are 6 images and as the distance between 2 points decrease I replace the image with a new resource.
I'm testing the app on the Galaxy S4 and the problem is that after a very small random number of loading the app crashes because of OutOfMemory.
Is there a good way to cache the images? (Maybe I need to load them by using an AsyncTask)
The images are 400x400px png- 24 bit with transparency.
Thank you
Try using this:
public static Bitmap decodeSampledBitmapFromResource(String uri,
int reqWidth, int reqHeight, int orientation) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(uri, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth,
reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
Bitmap decodeFile = BitmapFactory.decodeFile(uri, options);
int rotate = 0;
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_270:
rotate = 270;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotate = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_90:
rotate = 90;
break;
}
Matrix matrix = new Matrix();
// matrix.postScale(scaleWidth, scaleHeight);
matrix.postRotate(rotate);
Bitmap rotatedBitmap = Bitmap.createBitmap(decodeFile, 0, 0,
decodeFile.getWidth(), decodeFile.getHeight(), matrix, true);
return rotatedBitmap;
}
private static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float) height / (float) reqHeight);
} else {
inSampleSize = Math.round((float) width / (float) reqWidth);
}
}
return inSampleSize;
}
Galaxy S4 most likely works with the xxhdpi drawables, so you putting everything in mdpi will have the system scale up your images to match S4's dpi level, hence the OutOfMemory error. Try scaling and placing drawables in their respective folders depending on the dpi (including xhdpi and xxhdpi) and after that maybe optimize your code.
