Question

我有一个自定义视图的课程。其中一种方法是

    @Override
public void onDraw(Canvas  canvas) {     
        Paint  paint = new Paint (); 
        Bitmap wrench = BitmapFactory.decodeResource(getResources(), R.drawable.wrench);
        canvas.drawColor(Color .BLACK);
        for(int i = 0; i < 4; i++) {
            for(int j = 0; j < 4; j++) {
                int left = canvas.getWidth()/2 - wrench.getWidth()*2 + j*wrench.getWidth();
                int top = 0  + i*wrench.getHeight();
                canvas.drawBitmap(wrench, left, top, null);

                regions = new ArrayList<Region>();
                Region reg = new Region(left, top, left + wrench.getWidth(), top + wrench.getHeight());
                regions.add(reg);
       //                    int right = left + wrench.getWidth();
       //                    int bottom  = top + wrench.getHeight();
       //                    Log.d("REGION", left + "," + top + "," + right  + "," + bottom);
            }
        }
}

我的形状有8个区域。所以，在活动类

中

 playField = (PlayGameView) findViewById(R.id.play_field_surface_view);
    playField.setOnTouchListener(new View.OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
  //                if(playField.getRegions().contains(210, 10))  {
            ArrayList<Region> regions = playField.getRegions();
            for(Region region: regions ) {
                boolean condition = region.contains( (int)event.getX(), (int)event.getY());
                if(condition) {
                    Toast.makeText(PlayGameActivity.this, (int)event.getX() + " " + (int)event.getY(), 2000).show();
                }

            }

            return true;
        }
    });

但它不起作用！当我点击最后一个形状吐司被叫两次！但在其他形状上它被称为有时....帮助我^ _ ^

所以这段代码工作正常）

   @Override
public void onDraw(Canvas  canvas) {     
        Paint  paint = new Paint (); 
        Bitmap wrench = BitmapFactory.decodeResource(getResources(), R.drawable.wrench);
        canvas.drawColor(Color .BLACK);

        shapeWidth = wrench.getWidth();
        shapeHeight = wrench.getHeight();

        for(int i = 0; i < 4; i++) {
            for(int j = 0; j < 4; j++) {
                int left = canvas.getWidth()/2 - wrench.getWidth()*2 + j*wrench.getWidth();
                int top =  i*wrench.getHeight();
                canvas.drawBitmap(wrench, left, top, null);
                shapeLeft[j] = left;
                shapeTop[i] = top;
            }
        }

}


public ArrayList<Region>  getRegions() {
    regions = new ArrayList<Region>();

    for(int i = 0; i < 4; i++) {
        for(int j = 0; j < 4; j++) {
            Region reg = new Region(shapeLeft[j], shapeTop[i], shapeLeft[j] + shapeWidth, shapeTop[i] + shapeHeight);
            regions.add(reg);
//              int right = left + wrench.getWidth();
//              int bottom  = top + wrench.getHeight();
//              Log.d("REGION", left + "," + top + "," + right  + "," + bottom);
        }
    }

    return regions;
}

和

 playField = (PlayGameView) findViewById(R.id.play_field_surface_view);
    playField.setOnTouchListener(new View.OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
//              if(playField.getRegions().contains(210, 10))  {
            ArrayList<Region> regions = playField.getRegions();
            for(Region region: regions ) {
                if(event.getAction() == MotionEvent.ACTION_DOWN) {
                    boolean condition = region.contains( (int)event.getX(), (int)event.getY());
                    if(condition) {
                        Toast.makeText(PlayGameActivity.this, (int)event.getX() + " " + (int)event.getY(), 2000).show();
                    }
                }
            }

            return true;
        }
    });

Answer 1

仅对一个动作做出反应。在ACTION_DOWN方法中使用ACTION_UP或onTouch()，否则如果您遇到某个地区，则至少会被调用两次。

您还能指出on other shapes it called some times究竟意味着什么吗？

编辑：

您应该创建不在onDraw方法中的区域。在其他地方做（构造函数？）。

一个小小的tipp：如果你想看看你的地区是否正确，你应该在最后画出屏幕上的rects / regions，以便它们覆盖游乐场。如果您的地区位于正确的地方且尺寸合适，那么应该会给您一个视觉反馈。同时改变您正在绘制的区域的颜色，因为它可能有助于查看某些问题。

如果你这样做了，你能为它提供截图吗？

android canvas ontouchevent不起作用

1 个答案: