Java tutorial
//package com.java2s; //License from project: Apache License import android.graphics.Bitmap; import android.graphics.Matrix; public class Main { /** * reversal bitmap at left-right * * @param originalImage * @return the bitmap after reversal */ public static Bitmap createReversal(Bitmap originalImage) { int width = originalImage.getWidth(); int height = originalImage.getHeight(); Matrix matrix = new Matrix(); matrix.preScale(-1.0f, 1.0f); return Bitmap.createBitmap(originalImage, 0, 0, width, height, matrix, false); } }