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Asked: 2026-05-20T06:24:56+00:00

If I have a large bitmap file that would normally generate an Out of

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If I have a large bitmap file that would normally generate an “Out of memory” exception, how can I load it as tiles? e.g. I have a 10,000×10,000 image, I want to split it up into a 10×10 grid of 1,000×1,000 pixel tiles.

I’ve seen the function Bitmap.createBitmap(sourceBitmap, x, y, width, height) but it requires my large image as the source input.

How can I get a tile from my input image, without fully loading the input image?

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1 Answer

  1. Editorial Team

    Answer from Romain Guy in Is it possible to chop a bitmap to small pieces without loading the entire thing into memory?:

    Android 2.3.3 has a new API called
    android.graphics.BitmapRegionDecoder
    that lets you do exactly what you
    want.

    You would for instance do the
    following:

    BitmapRegionDecoder decoder = BitmapRegionDecoder.newInstance(myStream, false);  
Bitmap region = decoder.decodeRegion(new Rect(10, 10, 50, 50), null);

    Easy 🙂

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