android canvas ontouchevent 不工作

Question

我的自定義視圖有一個 class。 其中一種方法是

    @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);
            }
        }
}

我的形狀有 8 個區域。 所以，在活動 class

 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。 當我點擊最后一個形狀時，吐司被調用了兩次。 但在其他形狀上它有時被稱為....幫助我^_^

所以這段代碼工作正常）

   @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

只對一個動作做出反應。 在你的onTouch()方法中使用ACTION_DOWN或ACTION_UP ，否則如果你點擊一個區域，它至少會被調用兩次。

您能否也請說明on other shapes it called some times確切含義？

編輯：

您應該創建不在 onDraw 方法內的區域。 在其他地方做（構造函數？）。

一個小技巧：如果你想看看你的區域是否正確，你應該在最后在屏幕上繪制矩形/區域，以便它們覆蓋操場。 如果您的區域位於正確的位置並且具有正確的大小，那應該會給您視覺反饋。 還要更改您正在繪制的區域的顏色，因為這可能有助於發現一些問題。

如果你這樣做了，你能提供一個截圖嗎？