Android ImageView 加边框

直接看代码：

 1 package shadow.widget;
 2 
 3 import android.content.Context;
 4 import android.graphics.Canvas;
 5 import android.graphics.Color;
 6 import android.graphics.Paint;
 7 import android.graphics.Rect;
 8 import android.util.AttributeSet;
 9 import android.widget.ImageView;
10 
11 public class myImageView extends ImageView {
12 
13     private String namespace="http://shadow.com";
14     private int color;
15 
16     public myImageView(Context context, AttributeSet attrs) {
17         super(context, attrs);
18         // TODO Auto-generated constructor stub
19         color=Color.parseColor(attrs.getAttributeValue(namespace, "BorderColor"));
20     }
21 
22     /* (non-Javadoc)
23      * @see android.widget.ImageView#onDraw(android.graphics.Canvas)
24      */
25     @Override
26     protected void onDraw(Canvas canvas) {
27         // TODO Auto-generated method stub    
28         
29         super.onDraw(canvas);    
30         //画边框
31         Rect rec=canvas.getClipBounds();
32         rec.bottom--;
33         rec.right--;
34         Paint paint=new Paint();
35         paint.setColor(color);
36         paint.setStyle(Paint.Style.STROKE);
37         canvas.drawRect(rec, paint);
38     }

39 } 

 这里要注意的是super.onDraw(canvas);在前，否则边框可能会被图片所覆盖。

xml写法

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:shadow="http://shadow.com"
  android:background="@drawable/bg_newslist"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
      <RelativeLayout android:id="@id/LinerLayout01"
      android:layout_width="fill_parent" 
    android:layout_height="fill_parent"    >
          <shadow.widget.myImageView 
              android:id="@id/newsitemPicWithBorder"
              shadow:BorderColor="GRAY"
            android:layout_width="80px" 
            android:layout_height="60px"
            android:layout_alignParentRight="true"
            android:src="@drawable/image_loading"
            android:layout_centerInParent="true"
            android:layout_marginRight="3px"
        ></shadow.widget.myImageView>

</LinearLayout> 

设置边框颜色 shadow:BorderColor="GRAY" 

 

myImageView  imageView=(myImageView)findViewById(....);

imageView.set....//给imageView赋值