沿手指滑動列表視圖中的項目

Question

我想滑動ExpandablelistView中的項目並將其推離屏幕。我現在可以做到這一點，但是當我的滑動手勢結束時這個動作會執行，並且當您滑動電子郵件時，我希望它像我的手指一樣移動。 （我也喜歡透明度隨着翻譯的增加而增加） 您能幫我提供一些建議或教程鏈接嗎？

我具有延伸BaseExpandableAdapter，用於檢測滑動手勢和一個mainActivity

MainActivity類別

public class MainActivity extends Activity implements OnScrollListener{ 
    ExpandableListView lv1; 
    private CustomListAdapter cla; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     lv1 = (ExpandableListView) findViewById(R.id.list); 
     final SwipeDetector swipeDetector = new SwipeDetector(); 
     lv1.setOnTouchListener(swipeDetector); 
     cla = new CustomListAdapter(this); 
     addData(); 
     lv1.setAdapter(cla); 
     lv1.setOnScrollListener(this); 
     lv1.setOnChildClickListener(new OnChildClickListener() { 
      @Override 
      public boolean onChildClick(ExpandableListView parent, View v, 
        int groupPosition, int childPosition, long id) { 
       Object o = cla.getGroup(groupPosition); 
       MatchResult m =((trnmSeparator) o).getMatches().get(childPosition); 
       //int type = (Integer) rowType.get(position); 
       if (swipeDetector.swipeDetected()){ 
        // do the onSwipe action 
        //Toast.makeText(MainActivity.this, "SWIPE :" + " " + m , Toast.LENGTH_SHORT).show(); 
        float dest = 0; 
        v = v.findViewById(R.id.match); 
        float place = v.getX(); 
        if (swipeDetector.getAction() == Action.LR){ 
         if (place == 0) dest = v.getWidth(); 
         else if (place > 0) dest = v.getWidth(); 
         else if (place < 0) dest = 0; 
        } 
        else if (swipeDetector.getAction() == Action.RL){ 
         if (place == 0) dest = -v.getWidth(); 
         else if (place > 0) dest = 0; 
         else if (place < 0) dest = -v.getWidth(); 
        } 
        ObjectAnimator oa = ObjectAnimator.ofFloat(v, "x", dest); 
        oa.setDuration(700); 
        oa.start(); 
        Log.v("view type", v.toString()); 
        return false; 
       } else { 
        // do the onItemClick action 
        Toast.makeText(MainActivity.this, "Selected :" + " " + m, Toast.LENGTH_SHORT).show(); 
        return true; 
       } 
      } 
     }); 

     lv1.setOnGroupClickListener(new OnGroupClickListener() { 

      @Override 
      public boolean onGroupClick(ExpandableListView parent, View v, 
        int groupPosition, long id) { 
       if (swipeDetector.swipeDetected()){ 
        // do the onSwipe action 
        Object o = lv1.getItemAtPosition(groupPosition); 
        Toast.makeText(MainActivity.this, "SWIPE :" + " " + o , Toast.LENGTH_SHORT).show(); 
        return true; 
       } 
       if (lv1.isGroupExpanded(groupPosition)){ 
        Object o = cla.getGroup(groupPosition); 
        Log.v("type", o.getClass().toString()); 
        for (int i = 0; i < ((trnmSeparator) o).getMatches().size(); i++){ 
         lv1.getChildAt(i).setX(0f); 
        } 
       } 
       return false; 
      } 
     }); 

     lv1.setOnItemLongClickListener(new OnItemLongClickListener() { 
      @Override 
      public boolean onItemLongClick(AdapterView<?> arg0, View arg1, 
        int arg2, long arg3) { 
       Toast.makeText(MainActivity.this, "Long Press" + lv1.getItemAtPosition(arg2), Toast.LENGTH_SHORT).show(); 
       return false; 
      } 
     }); 
    } 

    @Override 
    public void onScroll(AbsListView view, int firstVisibleItem, 
      int visibleItemCount, int totalItemCount) { 
     // TODO Auto-generated method stub 
     boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount; //maybe add a padding 
     if(loadMore) { 
      addData(); 
      //cla.count += visibleItemCount; // or any other amount 
      cla.notifyDataSetChanged(); 
     } 
    } 
} 

和我的滑動檢測器

package com.example.jadidtar; 

import android.util.Log; 
import android.view.MotionEvent; 
import android.view.View; 

public class SwipeDetector implements View.OnTouchListener { 
    public static enum Action { 
     LR, // Left to Right 
     RL, // Right to Left 
     None // when no action was detected 
    } 

    private static final String logTag = "SwipeDetector"; 
    private static final int HORIZONTAL_MIN_DISTANCE = 100; 
    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) { 
         mSwipeDetected = Action.LR; 
         return true; 
        } 
        if (deltaX > 0) { 
         mSwipeDetected = Action.RL; 
         return true; 
        } 
       } 
       return false; 
      } 
     } 
     return false; 
    } 
} 

Answer 1

這裏一類的適配器是的一部分代碼，即時通訊使用做你想要的一樣。它的（的LinearLayout）對象使用onTouchListner（至極是我的列表視圖行）：

VelocityTracker _VelocityTracker; 
int _slop; 

ViewConfiguration vc = ViewConfiguration.get(context); 
_slop = vc.getScaledTouchSlop(); 

[.........code ......] 

_dividerRow.setOnTouchListener(new MyGestureListener() 
       ); 


class MyGestureListener implements OnTouchListener{ 
     private PointF _init; 
     @Override 
     public boolean onTouch(View v, MotionEvent event) { 

      switch(event.getAction()) 
      { 
      case MotionEvent.ACTION_DOWN : 
       _init = new PointF(event.getRawX(), event.getRawY()); 
       if(!(v == null)) 
       { 
        _VelocityTracker = VelocityTracker.obtain(); 
        _VelocityTracker.addMovement(event); 
       } 

       break; 

      case MotionEvent.ACTION_UP : 
       break; 

      case MotionEvent.ACTION_MOVE : 
       if(event.getX() > 0) 
       { 
         _VelocityTracker.addMovement(event); 
         float diffX = event.getRawX() - _init.x; 
         float diffY = event.getRawY() - _init.y; 

         if (Math.abs(diffX) > _slop && Math.abs(diffX) > Math.abs(diffY)) { 
          _swipping = true; 
          ((ViewGroup) v).requestDisallowInterceptTouchEvent(true); 

          MotionEvent cancelEvent = MotionEvent.obtain(event); 
          cancelEvent.setAction(MotionEvent.ACTION_CANCEL | (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT)); 
          v.onTouchEvent(cancelEvent); 
         } 

         if(_swipping == true) 
         { 

          ViewHelper.setTranslationX(v, diffX); 
         } 
        } 

       break; 
      } 
      return false; 
     } 
    } 

希望它可以幫助