android - 将圆角添加到自定义视图

Question

我对 Android 很陌生，我正在尝试在自定义视图（使用画布）上绘制。我有一些线条和直角。关键是，我现在想给整个视图添加圆角，但这效果不佳，因为我正在视图上绘图，而我的绘图位于圆角上方，这些圆角是通过资源添加的。是否有可能添加覆盖整个视图的圆角？

最好的问候，感谢您的帮助！

Answer 1

我不确定你的要求。但是您可以使用以下内容并进行相同的修改

activity_main.xml

<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"
android:id="@+id/rl"
android:background="@drawable/bkg" //set background
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
</RelativeLayout>

bkg.xml

 <?xml version="1.0" encoding="UTF-8"?> 
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle"> 
 <solid android:color="#10EB0A"/>    //set color
 <stroke android:width="3dp"         // set border  
 android:color="#0FECFF" />          //set border color 
 <padding android:left="5dp"         //set padding
 android:top="5dp" 
 android:right="5dp"
 android:bottom="5dp"/> 
 <corners android:bottomRightRadius="20dp" //set radius
 android:bottomLeftRadius="20dp" 
 android:topLeftRadius="20dp"
 android:topRightRadius="20dp"/> 
 </shape> 

MainActivity.java

    public class MainActivity extends Activity {

RelativeLayout rl;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    rl = (RelativeLayout) findViewById(R.id.rl);
    CustomView cv = new CustomView(this);
    rl.addView(cv);  //add custom view to the relative layout
} 

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
class CustomView extends View
{
    Bitmap bmp;
    PaintDrawable mDrawable;

    public CustomView(Context context) {
        super(context); 
        bmp = BitmapFactory.decodeResource(context.getResources(),R.drawable.ic_launcher);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);

        canvas.drawBitmap(bmp, 200, 200, null);
    }   
       }
  }

快照

Answer 2

    public class RoundCornerView extends View{
    public RoundCornerView(Context context) {
        super(context);
    }

    public RoundCornerView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public RoundCornerView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    protected void onDraw(android.graphics.Canvas canvas)
    {
        Paint paint = new Paint();

        paint.setAlpha(255);
        canvas.translate(0, 30);
        paint.setColor(Color.BLUE);
        Path mPath = new Path();
        mPath.addRoundRect(new RectF(0, 0, 100,100),20,20, Path.Direction.CCW);
        canvas.clipPath(mPath, Region.Op.INTERSECT);
        paint.setColor(Color.GREEN);
        paint.setAntiAlias(true);
        canvas.drawRect(0, 0, 120,120,paint);

    }
}

尝试使用剪辑路径，但就像 3.0 之后的旁注一样，您需要在清单中关闭 hardwareAccelerated

安卓：硬件加速=“假”

有解决方案，创建后将在此处作为补充发布