图片简易处理

package com.example.copy;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.os.Bundle;
import android.widget.ImageView;
public class MainActivity extends Activity {

   /**
      1. 加载原图
      2. 笔
      3. 纸
      4. 板
      5. 作画
    */

   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      ImageView iv = (ImageView) findViewById(R.id.iv_copy);     
      Bitmap srcBmp = BitmapFactory.decodeResource(getResources(), R.drawable.last_year);
      Paint paint = new Paint();
      Bitmap copyBmp = Bitmap.createBitmap(srcBmp.getWidth(), srcBmp.getHeight(), srcBmp.getConfig());
      //把白纸铺在画板上
      Canvas canvas = new Canvas(copyBmp);
      Matrix matrix = new Matrix();
     // 平移
      // matrix.setTranslate(-copyBmp.getWidth()/2, 0);
      // 缩放
//    matrix.setScale(0.5f,0.5f);
//    matrix.setScale(0.5f,0.5f, copyBmp.getWidth()/2, copyBmp.getHeight()/2);
      // 旋转
//    matrix.setRotate(45);
//    matrix.setRotate(90,copyBmp.getWidth()/2, copyBmp.getHeight()/2);
      // 镜面
//    matrix.setScale(-1, 1);
//    matrix.setTranslate(copyBmp.getWidth(), 0);
      //叠加显示效果
//    matrix.postTranslate(copyBmp.getWidth(), 0);
      // 倒影
      matrix.setScale(1, -1);
      matrix.postTranslate(0, copyBmp.getHeight());
      canvas.drawBitmap(srcBmp, matrix, paint);
      iv.setImageBitmap(copyBmp);
   }
}