实现带描边的圆角图片

Myth丶恋晨 2022-08-19 12:16 198阅读 0赞

1、布局文件

<?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/frameLayout1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
       
    </FrameLayout>

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);
    		}
        }
    }

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[Center]: /images/20220731/dbbdf3090f2e41e188e2943a9a48ec6f.png