android中复制图片

activity_main.xml中的配置

<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>

 

MainActivity中代码：

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);        
    }
}