Java tutorial
//package com.java2s; import java.io.ByteArrayInputStream; import java.io.InputStream; import android.graphics.Bitmap; public class Main { public static InputStream bitmapToInputStream(Bitmap bitmap) { int size = bitmap.getHeight() * bitmap.getRowBytes(); ByteBuffer buffer = ByteBuffer.allocate(size); bitmap.copyPixelsToBuffer(buffer); return new ByteArrayInputStream(buffer.array()); } }