图片的操作

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);

}

}