一、解析
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1、首先定義兩張圖片：
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm3);
第二張根據第一張生成
Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());

2、以生成的第二張圖片做畫板
Canvas canvas = new Canvas(modBm);

3、建立矩陣，並水平平移
matrix.setScale(-1, 1);
matrix.postTranslate(bm.getWidth(), 0);

4、使用矩陣繪製映象圖片
canvas.drawBitmap(bm, matrix, paint);

5、最後設定到imageview裡

二、原始碼

/**
 * 鏡子效果
 * @author chen.lin
 *
 */
public class MirrorImageActivity extends Activity {

    private ImageView imageView1;
    private ImageView imageView2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super
 
.onCreate(savedInstanceState);
        setContentView(R.layout.activity_image_rotate);
        initViews();
    }

    private void initViews() {
        imageView1 = (ImageView) findViewById(R.id.imageView1);
        imageView2 = (ImageView) findViewById(R.id.imageView2);

        Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm3);
        imageView1.setImageBitmap(bm);

        Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
        Canvas canvas = new
 
 Canvas(modBm);
        Paint paint = new Paint();
        paint.setColor(Color.BLACK);
        paint.setAntiAlias(true);
        Matrix matrix = new Matrix();
        //matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
        //matrix.setTranslate(20, 20);
        //鏡子效果
        matrix.setScale(-1, 1);
        matrix.postTranslate(bm.getWidth(), 0);

        canvas.drawBitmap(bm, matrix, paint);
        imageView2.setImageBitmap(modBm);
    }
}

佈局檔案：
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