android imageview设置边框 android ImageView 添加边框

有两种方法可以给ImageView添加边框，一种是通过xml文件配置shape.另一种是重写ImageView的ondraw方法，这里用第二中方法：

packageorg.example.image.widgets;

importandroid.content.Context;

importandroid.graphics.Canvas;

importandroid.graphics.Paint;

importandroid.graphics.Rect;

importandroid.widget.ImageView;

publicclassMyImageViewextendsImageView{

//边框颜色

privateintborderColor;

//边框宽度

privateintborderWidth;

publicMyImageView(Contextcontext){

super(context);

}

//设置边框颜色

publicvoidsetBorderColor(intborderColor){

this.borderColor=borderColor;

}

//设置边框宽度

publicvoidsetBorderWidth(intborderWidth){

this.borderWidth=borderWidth;

}

//重写绘图方法

@Override

protectedvoidonDraw(Canvascanvas){

super.onDraw(canvas);

//画边框

Rectrect=canvas.getClipBounds();

rect.bottom--;

rect.right--;

Paintpaint=newPaint();

paint.setColor(borderColor);

paint.setStyle(Paint.Style.STROKE);

paint.setStrokeWidth(borderWidth);

canvas.drawRect(rect,paint);

}

}