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);    
  }
}