How to load large images in Android and avoiding the out of memory error?

android, bitmap, out-of-memory

Solution

You can use another bitmap-config to heavily decrease the size of the images. The default is RGB-config ARGB8888 which means four 8-bit channels are used (red, green, blue, alhpa). Alpha is transparency of the bitmap. This occupy a lot of memory - imagesize X 4. So if the imagesize is 4 megapixel 16 megabytes will immidiately be allocated on the heap - quickly exhausting the memory.

Instead - use RGB_565 which to some extent deteriorate the quality - but to compensate this you can dither the images.

So - to your method decodeSampledBitmapFromResource - add the following snippets:

 options.inPreferredConfig = Config.RGB_565;
 options.inDither = true;

In your code:

 public static Bitmap decodeSampledBitmapFromResource(Resources res, String resId, int    reqWidth, int reqHeight) {

 // First decode with inJustDecodeBounds=true to check dimensions
 final BitmapFactory.Options options = new BitmapFactory.Options();
 options.inJustDecodeBounds = true;
 BitmapFactory.decodeFile(resId, options);

 // Calculate inSampleSize
 options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

 // Decode bitmap with inSampleSize set
 options.inJustDecodeBounds = false;
 options.inPreferredConfig = Config.RGB_565;
 options.inDither = true;
 return BitmapFactory.decodeFile(resId, options);
 }

References:

http://developer.android.com/reference/android/graphics/Bitmap.Config.html#ARGB_8888

Problem

I'm working on an app that uses large images (1390 × 870 : 150kb - 50kb). I'm adding images as I tap a trigger/ImageView. At a certain point I'm getting an out of memory error: ``` java.lang.OutOfMemoryError E/AndroidRuntime(23369): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method) E/AndroidRuntime(23369): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:613) E/AndroidRuntime(23369): at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:378) ``` To resize the image I'm doing this: ``` Bitmap productIndex = null; final String imageLoc = IMAGE_LOCATION; InputStream imageStream; try { imageStream = new FileInputStream(imageLoc); productIndex = decodeSampledBitmapFromResource(getResources(), imageLoc, 400, 400); productIV.setImageBitmap(productIndex); } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } public static Bitmap decodeSampledBitmapFromResource(Resources res, String resId, int reqWidth, int reqHeight) { // First decode with inJustDecodeBounds=true to check dimensions final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(resId, options); // Calculate inSampleSize options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); // Decode bitmap with inSampleSize set options.inJustDecodeBounds = false; return BitmapFactory.decodeFile(resId, options); } public 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) { final int halfHeight = height / 3; final int halfWidth = width / 3; // Calculate the largest inSampleSize value that is a power of 2 and keeps both // height and width larger than the requested height and width. while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { inSampleSize *= 2; } } return inSampleSize; } ``` I got this way of resizing to save space from the Android Docs: Loading Large Bitmaps Efficiently According to the log this like is the culprit in the `decodeSampledBitmapFromResource` method : ``` return BitmapFactory.decodeFile(resId, options); ``` ----- edit ----- Here is how I'm adding each item to the FrameLayout. ``` for(int ps=0;ps<productSplit.size();ps++){ //split each product by the equals sign List<String> productItem = Arrays.asList(productSplit.get(ps).split("=")); String tempCarID = productItem.get(0); tempCarID = tempCarID.replace(" ", ""); if(String.valueOf(carID).equals(tempCarID)){ ImageView productIV = new ImageView(Configurator.this); LayoutParams productParams = new LayoutParams( LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); productIV.setId(Integer.parseInt(partIdsList.get(x))); productIV.setLayoutParams(productParams); final String imageLoc = productItem.get(2); InputStream imageStream; try { imageStream = new FileInputStream(imageLoc); productIndex = decodeSampledBitmapFromResource(getResources(), imageLoc, 400, 400); productIV.setImageBitmap(productIndex); } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } productLayers.addView(productIV); } } ```

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