图片的操作

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public class MainActivity extends Activity {
   private ImageView iv_1;
   private ImageView iv_2;

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

       iv_1 = (ImageView) findViewById(R.id.iv_1);
       iv_2 = (ImageView) findViewById(R.id.iv_2);

       //导入图片资源，该图片是只读的
       Bitmap map = BitmapFactory.decodeResource(getResources(),
               R.drawable.gif);
       iv_1.setImageBitmap(map);
       //创建一个可修改的
       Bitmap altermap = Bitmap.createBitmap(map.getWidth(),
               map.getHeight(), map.getConfig());
       //创建画布，绑定可修改的图版
       Canvas canvas = new Canvas(altermap);

       //对图片操作的矩阵
       Matrix matrix = new Matrix();
       //画笔
       Paint paint = new Paint();

       //图片的合成
       //paint.setXfermode(new PorterDuffXfermode(android.graphics.PorterDuff.Mode.MULTIPLY));
       paint.setColor(Color.BLACK);
       // 图片的缩放
       // matrix.setScale(2.0f, 1);

       // 图片的旋转
       // matrix.setRotate(180, map.getWidth()/2, map.getHeight()/2);

       //图片的平移
       //matrix.setTranslate(10, 10);

       //镜面效果
       // matrix.setScale(-1, 1);
       // matrix.postTranslate(map.getWidth(), 0);

       //倒影效果
       matrix.setScale(1, -1);
       matrix.postTranslate(0, map.getHeight());


       canvas.drawBitmap(map, matrix, paint);
       iv_2.setImageBitmap(altermap);
   }

}

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