Android ListView OnTouchListener不能正常工作

Question

我在片段中创建了自定义列表视图。现在我想从左到右滑动。我为此创建了一个监听器类。但是听众不为我工作。

下面是监听器类：

public class SwipeDetector implements OnTouchListener { 

public static enum Action { 
    LR, // Left to Right 
    RL, // Right to Left 
    TB, // Top to bottom 
    BT, // Bottom to Top 
    None // when no action was detected 
} 

private static final String logTag = "SwipeDetector"; 
private static final int MIN_DISTANCE = 100; 
private static final int HORIZONTAL_MIN_DISTANCE = 40; 
private static final int VERTICAL_MIN_DISTANCE = 80; 
private float downX, downY, upX, upY; 
private Action mSwipeDetected = Action.None; 

public boolean swipeDetected() { 
    return mSwipeDetected != Action.None; 
} 

public Action getAction() { 
    return mSwipeDetected; 
} 

public boolean onTouch(View v, MotionEvent event) { 
    switch (event.getAction()) { 
     case MotionEvent.ACTION_DOWN: { 
      downX = event.getX(); 
      downY = event.getY(); 
      mSwipeDetected = Action.None; 
      return false; // allow other events like Click to be processed 
     } 
     case MotionEvent.ACTION_MOVE: { 
      upX = event.getX(); 
      upY = event.getY(); 

      float deltaX = downX - upX; 
      float deltaY = downY - upY; 

      // horizontal swipe detection 
      if (Math.abs(deltaX) > HORIZONTAL_MIN_DISTANCE) { 
       // left or right 
       if (deltaX < 0) { 
        Log.i(logTag, "Swipe Left to Right"); 
        mSwipeDetected = Action.LR; 
        return true; 
       } 
       if (deltaX > 0) { 
        Log.i(logTag, "Swipe Right to Left"); 
        mSwipeDetected = Action.RL; 
        return true; 
       } 
      } else 

      // vertical swipe detection 
      if (Math.abs(deltaY) > VERTICAL_MIN_DISTANCE) { 
       // top or down 
       if (deltaY < 0) { 
        Log.i(logTag, "Swipe Top to Bottom"); 
        mSwipeDetected = Action.TB; 
        return false; 
       } 
       if (deltaY > 0) { 
        Log.i(logTag, "Swipe Bottom to Top"); 
        mSwipeDetected = Action.BT; 
        return false; 
       } 
      } 
      return true; 
     } 
    } 
    return false; 
} 
} 

这里是片段：

public class FragmentOne extends Fragment implements OnClickListener { 

Button addItem; 
List<String> Testing; 
ArrayAdapter<String> productAdapter; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    // addChildFragOne(); 
    // addChildFragTwo(); 
    View RootView = inflater.inflate(R.layout.fragment_one_layout, container, false); 
    ListView productsList = (ListView) RootView.findViewById(R.id.listView1); 

    Testing = new ArrayList<String>(); 
    Testing.add("Hey"); 
    Testing.add("Hey"); 
    Testing.add("Hey"); 
    Testing.add("Hey"); 
    productAdapter = new ArrayAdapter(getActivity(), R.layout.product_item, R.id.textView2, Testing); 
    productsList.setAdapter(productAdapter); 

    addItem = (Button) RootView.findViewById(R.id.button1); 
    addItem.setOnClickListener(this); 

    final SwipeDetector swipeDetector = new SwipeDetector(); 

    productsList.setOnTouchListener(swipeDetector); 
    productsList.setOnItemClickListener(new OnItemClickListener() { 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      if (swipeDetector.swipeDetected()) { 
       // do the onSwipe action 
       Toast.makeText(getContext(), "Text!", Toast.LENGTH_SHORT).show(); 
       Testing.remove(position); 
       productAdapter.notifyDataSetChanged(); 
      } else { 
       // do the onItemClick action 
      } 
     } 
    }); 

    return RootView; 

} 


} 

为什么OnTouchListener不工作？请帮忙。谢谢

Answer 1

您的setOnItemClickListener与OnTouchListener冲突。在运行时你只能使用一个，所以在你的情况下，我认为你应该使用setOnItemClickListener的OnTouchListener instea（而不是setOnItemClickListener）。

示例代码，你可以在这里阅读use OnTouchListener instea of ItemClickListener