拖放（如果我拖动正确的图像，则选中该标记）

Question

如果我将countryTypical图像拖放到imageCountry [n9]中，则应用程序将选中标记图像设置在正确的countryTypical图像上。 如果拖动正确的countryTypical图像，并且拖动错误的countryTypical图像，也会发生这种情况。 我想更正错误。 非常感谢...

String[] countryNames = {
        "Italy", "France", "Spain", "Germany", "Belgium", "Portugal", "Switzerland", "Great Britain"
};

int[] countryImages = {
        R.drawable.italy,
        R.drawable.france,
        R.drawable.spain,...
};
int[] countryFlags = {
        R.drawable.italian_flag,
        R.drawable.french_flag,
        R.drawable.spanish_flag,....
};

在我的OnCreate中：

countryTypical1.setImageResource(countryFlags[n1]);
    countryTypical2.setImageResource(countryFlags[n2]);
    countryTypical3.setImageResource(countryFlags[n3]);
    countryTypical4.setImageResource(countryFlags[n4]);
    countryTypical5.setImageResource(countryFlags[n5]);
    countryTypical6.setImageResource(countryFlags[n6]);
    countryTypical7.setImageResource(countryFlags[n7]);
    countryTypical8.setImageResource(countryFlags[n8]);

    countryTypical1.setOnTouchListener(dragClick);
    countryTypical2.setOnTouchListener(dragClick);
    countryTypical3.setOnTouchListener(dragClick);
    countryTypical4.setOnTouchListener(dragClick);
    countryTypical5.setOnTouchListener(dragClick);
    countryTypical6.setOnTouchListener(dragClick);
    countryTypical7.setOnTouchListener(dragClick);
    countryTypical8.setOnTouchListener(dragClick);

    imageCountry.setOnDragListener(DropListener);

View.OnTouchListener dragClick = new View.OnTouchListener（）{

    public boolean onTouch(View view, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_MOVE) {
            DragShadow dragShadow = new DragShadow(view);

            ClipData dragData = ClipData.newPlainText("", "");
            view.startDrag(dragData, dragShadow, view,0);
            return true;
        }
        return true;
    }
};



private class DragShadow extends View.DragShadowBuilder{

    public DragShadow(View view) {
        super(view);
    }
    @Override
    public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) {
        View view = getView();
        int height = view.getHeight();
        int width = view.getWidth();

        shadowSize.set(width, height);
        shadowTouchPoint.set(width, height);
    }

    @Override
    public void onDrawShadow(Canvas canvas) {
        getView().draw(canvas);
    }
}


View.OnDragListener DropListener = new View.OnDragListener() {

    @Override
    public boolean onDrag(View view, DragEvent event) {
        assignDropTrue(countryTypical1, event, n1);
        assignDropTrue(countryTypical2, event, n2);
        assignDropTrue(countryTypical3, event, n3);
        assignDropTrue(countryTypical4, event, n4);
        assignDropTrue(countryTypical5, event, n5);
        assignDropTrue(countryTypical6, event, n6);
        assignDropTrue(countryTypical7, event, n7);
        assignDropTrue(countryTypical8, event, n8);
        return true;
    }

};



private void assignDropTrue(ImageView countryTypical, DragEvent event, int n1){
    if (n9 == n1){
        int dragEvent = event.getAction();
        switch (dragEvent) {
            case DragEvent.ACTION_DROP:
                countryTypical.setImageResource(R.drawable.vcheckmark);
        }}
}

Answer 1

我写了一个示例，目的只是为了让您对我提出的逻辑有一个想法（也就是未经测试）

View.OnDragListener DropListener = new View.OnDragListener() {
      @Override
      public boolean onDrag(View view, DragEvent event) {
          int action = event.getAction();
          View draggedView = (View) event.getLocalState();
          //view is the country where the flag was dropped, draggedView is the flag you dropped
          //below we check if the correct flag is dropped in the correct country

      switch (event.getAction()){
        case DragEvent.ACTION_DROP: 
          for (int i; i< countryImages.length(); i++){
               if (draggedView.getId() == countryFlags[i] && view.getId()== countryImages[i])
                   draggedView.setImageResource(R.drawable.vcheckmark); 

          }            
          break;
        default:
          break;
        }
        return true;
      }   
    };