Bitmap的简单特效处理

来源：互联网发布：谷歌拼音输入法linux 编辑：程序博客网时间：2024/05/16 16:13
public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                //这个对象是只读的        Bitmap bmSrc = BitmapFactory.decodeFile("sdcard/photo3.jpg");                //创建图片副本        //1.在内存中创建一个与原图一模一样大小的bitmap对象，创建与原图大小一致的白纸        Bitmap bmCopy = Bitmap.createBitmap(bmSrc.getWidth(), bmSrc.getHeight(), bmSrc.getConfig());                //2.创建画笔对象        Paint paint = new Paint();                //3.创建画板对象，把白纸铺在画板上        Canvas canvas = new Canvas(bmCopy);                //4.开始作画，把原图的内容绘制在白纸上        Matrix mt = new Matrix();                //平移//        mt.setTranslate(20, 40);        //缩放        //sx：水平方向的缩放比例        //sy：竖直方向的缩放比例//        mt.setScale(0.5f, 0.5f);//        mt.setScale(0.5f, 0.5f, bmCopy.getWidth() / 2, bmCopy.getHeight() / 2);        //旋转//        mt.setRotate(45, bmCopy.getWidth() / 2, bmCopy.getHeight() / 2);                //镜面//        mt.setScale(-1, 1);//        mt.postTranslate(bmCopy.getWidth(), 0);        //倒影        mt.setScale(1, -1);        mt.postTranslate(0, bmCopy.getHeight());        canvas.drawBitmap(bmSrc, mt, paint);                ImageView iv_src = (ImageView) findViewById(R.id.iv_src);        ImageView iv_copy = (ImageView) findViewById(R.id.iv_copy);        iv_src.setImageBitmap(bmSrc);        iv_copy.setImageBitmap(bmCopy);    }    }
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