如何设置通过 onDraw 绘制的自定义视图的尺寸和位置？-解网

问：

我通过扩展 .此类实现构造函数和方法。有了这些，就可以正确绘制视图。但是，它的尺寸是其父级的尺寸。我尝试添加 and 方法（在下面的代码中注释），但随后不再绘制自定义视图......ViewonDrawonMeasureonLayout

我的最终目标是能够在同一视图中绘制多个自定义视图，并能够为每个视图附加一个。如何解决此问题？FrameLayoutSimpleOnGestureListener

public class ScArc extends View {
RectF oval = new RectF();
Path path = new Path();
Paint paint = new Paint();
float left = 0;
float top = 0;
float right = 0;
float bottom = 0;
float startAngle = 0;
float sweepAngle;

public ScArc(Context context, float X1, float Y1, float X2, float Y2, ScMain.Azimuth azimuth, int sweepAngle,
             String strokeWidthName, String strokeColorName, int idx, boolean isForcingChain) {
    super(context);

    ...
    
    oval.set(left, top, right, bottom);
    path.addArc(oval, startAngle, sweepAngle);

    this.setClickable(true);
    this.setEnabled(true);
}

@Override
public void onDraw(Canvas canvas) {
    canvas.drawPath(path, paint);
}

//    @Override
//    public boolean onTouchEvent (MotionEvent event) {
//        if (((event.getSource() == SOURCE_MOUSE) || (event.getSource() == SOURCE_TOUCHPAD))
//                && (event.getAction() == MotionEvent.ACTION_DOWN)
//                && event.isButtonPressed(MotionEvent.BUTTON_SECONDARY)) {
//    
//            int tag = (int) this.getTag();
//            drawnStrongLinks.remove(drawnStrongLinks.indexOf(tag));
//    
//            FrameLayout drawingFrame = (FrameLayout) this.getParent();
//            drawingFrame.removeView(this);
//        }
//        return true;
//    }

//    @Override
//    protected void onLayout (boolean changed, int left, int top, int right, int bottom) {
//        super.onLayout(changed, (int) oval.left, (int) oval.top, (int) oval.right, (int) oval.bottom);
//    }

//    @Override
//    protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec) {
//        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//        this.setMeasuredDimension((int) (oval.right - oval.left), (int) (oval.bottom - oval.top));
//    }

}

Java Android OnDraw

 @Override
 public boolean onDown(MotionEvent event) {
     if (((event.getSource() == SOURCE_MOUSE) || (event.getSource() == SOURCE_TOUCHPAD))
             && (event.isButtonPressed(MotionEvent.BUTTON_SECONDARY))) {
         FrameLayout drawingFrame = SCFrame.findViewById(R.id.drawingFrame);
         if (drawingFrame.getChildCount() > 0) {
             alignmentSquare = SCFrame.findViewById(R.id.alignmentSquare);
             RectF touchZone = new RectF();
             touchZone.set((float) (event.getX() - alignmentSquare.getWidth() - 0.5 * textViewWidth),
                         (float) (event.getY() - alignmentSquare.getHeight() - 0.5 * textViewHeight),
                         (float) (event.getX() - alignmentSquare.getWidth() + 0.5 * textViewWidth),
                         (float) (event.getY() - alignmentSquare.getHeight() + 0.5 * textViewHeight));
             int tag = -1;
             for (int i = 0; i < drawingFrame.getChildCount(); i++) {
                 View v = drawingFrame.getChildAt(i);
                 if ((v instanceof ScArc) && touchZone.intersect(((ScArc) v).oval)) {
                     tag = (int) v.getTag();
                     break;
                 }
             }

         ...
         }
     }
 }

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如何设置通过 onDraw 绘制的自定义视图的尺寸和位置？

How can I set the dimension and position of a custom view drawn via onDraw?

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