实现带描边的圆角图片

1、布局文件

2、MainActivity

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FrameLayout ll = (FrameLayout)findViewById(R.id.frameLayout1);
        ll.addView(new MyView(this));
    }

    public class MyView extends View{
		public MyView(Context context) {
			super(context);
		}
		@Override
		protected void onDraw(Canvas canvas) {
			Paint paint = new Paint();//定义一个画笔
			paint.setAntiAlias(true);//使用抗锯齿功能
			Bitmap bitmap_bg = BitmapFactory.decodeResource(MainActivity.this.getResources(),
					R.drawable.background);
			canvas.drawBitmap(bitmap_bg, 0, 0, paint);//绘制背景
			RectF rect = new RectF(0, 0, 280, 180);
			canvas.translate(40, 20);//将画布在X轴上平移40像素，在Y轴上平移20像素
			//为图片添加描边
			paint.setStyle(Style.STROKE);//设置填充样式为描边
			paint.setColor(Color.BLACK);//设置颜色为褐色
			paint.setStrokeWidth(2);//设置笔触宽度为2像素
			canvas.drawRoundRect(rect, 10, 10, paint);//绘制一个描边的圆角矩形
			paint.setStyle(Style.FILL);//设置填充样式为填充
			Bitmap bm = BitmapFactory.decodeResource(MainActivity.this.getResources(),
					R.drawable.img02);
			//创建一个在水平方向上重复，在垂直方向上镜像的BitmapShader对象
			BitmapShader bs = new BitmapShader(bm, TileMode.REPEAT, TileMode.MIRROR);
			paint.setShader(bs);//设置渲染对象
			canvas.drawRoundRect(rect, 0, 0, paint);//绘制使用BitmapShader渲染的圆角矩形
			super.onDraw(canvas);
		}
    }
}