Android中复制图片的实例代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="@dimen/activity_vertical_margin"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  android:orientation="vertical"
  tools:context=".MainActivity" >
 <ImageView
   android:id="@+id/iv_one"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"/>
 <ImageView
   android:id="@+id/iv_two"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"/>
</LinearLayout>

public class MainActivity extends Activity {
  private ImageView ivOne;
  private ImageView ivTwo;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //1.获取图片控件
    ivOne = (ImageView) findViewById(R.id.iv_one);
    ivTwo = (ImageView) findViewById(R.id.iv_two);
    //2.把tomcat.png 转换成bitmap 然后显示到iv_src 
    Bitmap srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.tomcat);
    //3.将原图放置在第一个控件中
    ivOne.setImageBitmap(srcBitmap);
    //4.创建原图模板
    Bitmap copybitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());
    //5.想作画 需要一个画布  以copybitmap为模板 
    Canvas canvas = new Canvas(copybitmap);
    //6.创建一个画笔 
    Paint paint = new Paint();
    //7.开始作画  srcBitmap参考原图去画
    canvas.drawBitmap(srcBitmap, new Matrix(), paint);
    for (int i = 0; i < 10; i++) {
      //[一次修改多个像素]
      copybitmap.setPixel(20+i,30, Color.RED);
    }
    //8.把copybitmap显示到ivTwo上
    ivTwo.setImageBitmap(copybitmap);    
  }
}