Question

I am getting the error java.lang.OutOfMemoryError: bitmap size exceeds VM budget.

This occurs when creating a bitmap for the purpose of manually drawing a line graph.

width = display.getWidth() - 10;
height = width * 4 / 5;
Bitmap emptyBmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Bitmap charty = createMyGraphAndStuff(emptyBmap);

It looks like the total memory allocated was about 700 Kb, an unreasonable amount.

I’ve seen other solutions invoked when creating bitmaps from a file, but here I am generating one myself. How can I minimize its memory footprint?

Here’s some more code to give you a better idea of what it’s doing:

public Bitmap DrawTheGraphAndStuff(Bitmap bitmap, String[] scores)
{
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        drawTheGridLines(canvas);                                   

        plotTheDataPoints(canvas ,  scores ,  "the title" , 0 );    

        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;
}

Answer 1

when the OOM occur, give some advice:

1.need know the oom occur position, the log information is enough

2.the most time is the bitmap process, so you need know how much a image about used memory:

the formula: w * h * every pixel token memory in byte, if the Config is Config.ARGB_8888, every pixel token memory is 4bytes, if it is the Config.RGB_565, is 2bytes.

3.also, you need know the every app memory limits in your device:

   ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
   activityManager.getMemoryClass(); //return the memory size limit in MB

3.if the bitmap did not used again, try recyle() it

4.if began the bitmap process, the memory is almost the max memory limit, so use the adb shell dumpsys meminfo $pid to check the memory usage, also the ddms - allocation tracker is useful