How To Handle Outofmemoryerror

In my application I have photos, videos, etc.. In the case of images, I have done scaling, but sometimes I get an OutOfMemoryError. How can I handle the error efficiently?

Solution 1:

Check that the image size is smaller than the available memory before attempting to load it. So the most efficient way to handle OutOfMemoryException is to architecture your application in such a way that it never attempts to load lots of data into memory in order to avoid the exception.

Solution 2:

There is a method in Activity which is called when the device is coming low of memory, but this can only be used to trigger cache files cleaning. This does not mean that your application process is coming out of memory.

You could also add a try catch block to catch Error or OutOfMemoryError, but this would be too late.

Handling large numbers of Bitmaps or large Bitmaps is really difficult in android applications. You'll find some tips on this subject in this article from Romain Guy.

You can also take care of loading bitmaps directly to the resolution you need by specifying a sample size in the BitmapFactory.options you provide to BitmapFactory.decode*() methods.

Solution 3:

I have started to try this routine which loads a jpeg into an ImageView and checks for Out of Memory and re-scales until it fits.

staticpublicboolean tryJpegRead(ImageView imageView, File fn){
 if (!fn.exists()){ 
     Log.d("ANDRO_ASYNC",String.format("missing file %s",fn.getAbsolutePath()));
     returnfalse;
 }
 BitmapFactory.Options o = new BitmapFactory.Options();
    for (int i = 1; i<10; i++){
        o.inSampleSize = i;
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(fn.getAbsolutePath(), o);
        int h = o.outHeight;
        int w = o.outWidth;
        Log.d("ANDRO_ASYNC",String.format("going in h=%d w=%d resample = %d",h,w,o.inSampleSize));
        o.inJustDecodeBounds = false;
        try{
            imageView.setImageBitmap(
                Bitmap.createScaledBitmap(
                        BitmapFactory.decodeFile(fn.getAbsolutePath(), o), 
                        w, 
                        h, 
                        true)); 
            returntrue; // only happens when there is no error
        }catch(OutOfMemoryError E){
            Log.d("ANDRO_ASYNC",String.format("catch Out Of Memory error"));
    //      E.printStackTrace();
            System.gc();
        }           
    }
    returnfalse;
}

Solution 4:

When dealing with OutOfMemory errors related to bitmap manipulation, checking the size of the decoded bitmap is the best and as far I know only option. Code follows:

publicstatic BitmapFactory.Options getBitmapOptionsWithoutDecoding(String url){
    BitmapFactory.Optionsopts=newBitmapFactory.Options();
    opts.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(url, opts);
    return opts;
}

publicstaticintgetBitmapSizeWithoutDecoding(String url){
    BitmapFactory.Optionsopts= getBitmapOptionsWithoutDecoding(url);
    return opts.outHeight*opts.outWidth*32/(1024*1024*8);
}

//ref:http://stackoverflow.com/questions/6073744/android-how-to-check-how-much-memory-is-remainingpublicstaticdoubleavailableMemoryMB(){
    doublemax= Runtime.getRuntime().maxMemory()/1024;
    Debug.MemoryInfomemoryInfo=newDebug.MemoryInfo();
    Debug.getMemoryInfo(memoryInfo);
    return (max - memoryInfo.getTotalPss())/1024;
}

publicstaticfinallongSAFETY_MEMORY_BUFFER=10;//MBpublicstaticbooleancanBitmapFitInMemory(String path){
    longsize= getBitmapSizeWithoutDecoding(path);
    Log.d(TAG, "image MB:"+size);
    return size <= availableMemoryMB() - SAFETY_MEMORY_BUFFER;
}

ref: http://developer.android.com/training/displaying-bitmaps/load-bitmap.html

Solution 5:

In case you have big images like backgrounds or similar, a easy way to prevent Out Of Memory , is to move images from drawable-xhdpi to drawable-nodpi , but take care, this will load the bitmap without any modification. The good way should be used BitmapFactory.options to fit your necessity