Question

我有一些关于拖放的问题。该过程运行拖放运行完美。我正在开发一个应用程序，用户可以从罐子中拖放糖果。当ACTION_DROP检测到jar布局时，它将增加值（max为10），当糖果落入机架时，该值将减小。 enter image description here

问题在于，当我将甜点放在同一布局上时，它会不断增加/减少，直到该值达到其最大/最小数量。我该怎么做才能避免这个问题？

class MyDragListener implements OnDragListener {


    @Override
    public boolean onDrag(View v, DragEvent event) { 
        View view = (View) event.getLocalState();
        switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            // do nothing
            break;
        case DragEvent.ACTION_DRAG_ENTERED:
            // v.setBackgroundDrawable(enterShape);
            view.setVisibility(View.VISIBLE);

            break;
        case DragEvent.ACTION_DRAG_EXITED:
            // v.setBackgroundDrawable(answerShape);
            // v.setBackgroundDrawable(normalShape);
            view.setVisibility(View.VISIBLE);
            break;
        case DragEvent.ACTION_DROP:
            // // Dropped, reassign View to ViewGroup
            ViewGroup owner = (ViewGroup) view.getParent();

            Log.i("drop", "Id First :" + view.getId());
            Log.i("drop", "Id Second :" + v.getId());
            Log.i("value", "Value :" + view.getContentDescription());

            owner.removeView(view);

            if(v.getId()==R.id.jaroval)
            {
                RelativeLayout container = (RelativeLayout) v;
                container.addView(view);
                view.setVisibility(View.VISIBLE);
                value++;
                sound();
            }
            else{
                GridLayout container = (GridLayout) v;
                container.addView(view);
                view.setVisibility(View.VISIBLE);
                value--;
                sound();
            }
            break;
        case DragEvent.ACTION_DRAG_ENDED:
            // v.setBackgroundDrawable(answerShape);
            // v.setBackgroundDrawable(normalShape);
            view.setVisibility(View.VISIBLE);
        default:
            break;
        }

        return true;
    }

Answer 1

使用此示例代码 activity_mail.xml

<RelativeLayout xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/center"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<LinearLayout
    android:id="@+id/pinkLayout"
    android:layout_width="fill_parent"
    android:layout_height="210dp"
    android:background="#FF8989"
    android:orientation="vertical" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/dragtext" />
</LinearLayout>

<LinearLayout
    android:id="@+id/yellowLayout"
    android:layout_width="fill_parent"
    android:layout_height="250dp"
    android:layout_marginTop="210dp"
    android:background="#FFCC00"
    android:orientation="vertical" >
</LinearLayout>

2 - ; MainActivity.java

@SuppressLint（＆＃34; NewApi＆＃34）公共类MainActivity扩展Activity实现OnTouchListener， OnDragListener { private static final String LOGCAT = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    findViewById(R.id.textView1).setOnTouchListener(this);
    findViewById(R.id.pinkLayout).setOnDragListener(this);
    findViewById(R.id.yellowLayout).setOnDragListener(this);
}

@SuppressLint("NewApi")
public boolean onTouch(View view, MotionEvent motionEvent) {
    if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
        DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
        view.startDrag(null, shadowBuilder, view, 0);
        view.setVisibility(View.INVISIBLE);
        return true;
    } else {
        return false;
    }
}

public boolean onDrag(View layoutview, DragEvent dragevent) {
    int action = dragevent.getAction();
    switch (action) {
    case DragEvent.ACTION_DRAG_STARTED:
        Log.e(LOGCAT, "Drag event started");
        break;
    case DragEvent.ACTION_DRAG_ENTERED:
        Log.e(LOGCAT, "Drag event entered into " + layoutview.toString());
        break;
    case DragEvent.ACTION_DRAG_EXITED:
        Log.e(LOGCAT, "Drag event exited from " + layoutview.toString());
        break;
    case DragEvent.ACTION_DROP:
        Log.e(LOGCAT, "Dropped");
        View view = (View) dragevent.getLocalState();
        ViewGroup owner = (ViewGroup) view.getParent();
        owner.removeView(view);
        LinearLayout container = (LinearLayout) layoutview;
        container.addView(view);
        view.setVisibility(View.VISIBLE);
        break;
    case DragEvent.ACTION_DRAG_ENDED:
        Log.e(LOGCAT, "Drag ended");
        break;
    default:
        break;
    }
    return true;
}

}

在此示例中，首先删除DragEvent.ACTION_DROP条件实际视图，并将新视图添加到父视图，然后再显示该视图。因此，您将在侧面gridview中复制新视图，并从甜视图布局中删除。

我希望您能理解这个示例并轻松实现您的代码。

如何限制特定目标上的相同图像

1 个答案: