package cc.testimageviewbounds;import android.os.Bundle;
import android.app.Activity;
/*** Demo描述:* 给ImageView添加边框的两种实现方式* * 方式一:* 利用自定义的shape-->即此处的imageviewboundshape.xml* 且为ImageView设置background,即代码:* android:background="@drawable/imageviewboundshape"* * 方式二:* 自定义ImageView**/
public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);}
}

<?xml version="1.0" encoding="utf-8"?><!-- 定义矩形rectangle -->
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle"  ><!-- 设置边框的大小和颜色 --><stroke android:width="3dip" android:color="#ff0000" /> <!-- 设置矩形内的颜色,此处为透明色 --><solid android:color="@android:color/transparent"/><!-- 定义圆角弧度 --><cornersandroid:bottomLeftRadius="4dp"android:bottomRightRadius="4dp"android:topLeftRadius="4dp"android:topRightRadius="4dp"/></shape>

package cc.testimageviewbounds;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.ImageView;public class ImageViewSubClass extends ImageView {public ImageViewSubClass(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}public ImageViewSubClass(Context context, AttributeSet attrs) {super(context, attrs);}public ImageViewSubClass(Context context) {super(context);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);//获取控件需要重新绘制的区域Rect rect=canvas.getClipBounds();rect.bottom--;rect.right--;Paint paint=new Paint();paint.setColor(Color.RED);paint.setStyle(Paint.Style.STROKE);paint.setStrokeWidth(3);canvas.drawRect(rect, paint);}}

<RelativeLayout 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"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="给ImageView添加边框的两种方式"android:layout_centerHorizontal="true"android:layout_marginTop="65dip"/><ImageViewandroid:id="@+id/firstImageView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/ic_launcher"android:layout_centerHorizontal="true"android:layout_marginTop="150dip"android:background="@drawable/imageviewboundshape"/><cc.testimageviewbounds.ImageViewSubClassandroid:id="@+id/secondImageView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@drawable/ic_launcher"android:layout_centerHorizontal="true"android:layout_marginTop="250dip"/></RelativeLayout>