Android 滑动时更改listview行背景色

我需要实现这样一个特性。用户向左滑动listview的项目，另一个活动打开。当用户开始向左滑动时，listview项目的背景色应为绿色，当用户完成滑动时，新活动应打开，项目的背景色应为白色

我有SwipedTector类，可检测我的刷卡事件：

public class SwipeDetector implements View.OnTouchListener {

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

    private static final String logTag = "SwipeDetector";
    private static final int MIN_DISTANCE = 100;
    private static final float HORIZONTAL_MIN_DISTANCE = 5;
    private static final float VERTICAL_MIN_DISTANCE = 100;
    private float downX, downY, upX, upY ,  stopX, stopY;
    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.Start;
            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;
                        }
                    } 
                    Log.i("delta X", Float.toString(deltaX));
                    return true;
        }
        case MotionEvent.ACTION_UP:
        {

             stopX = event.getX();
             stopY = event.getY();
             float stopValue = upX-stopX;

             Log.i("StopX value",Float.toString(stopValue));
                 Log.i("StopX value",Float.toString(stopX));
                 Log.i("DownX value",Float.toString(downX));
                 Log.i("UpX value",Float.toString(upX));
               //
                 mSwipeDetected = Action.None;
             return false;
        }


        }
        return false;
    }
}

以及我如何在活动中使用它：

listView1.setOnItemClickListener(new OnItemClickListener() {
          public void onItemClick(AdapterView<?> parent, View view, int position, long id)
          {
                  if (swipeDetector.getAction()== swipeDetector.getAction().LR)
                  {
                      Log.i("start value", "it might be started");
                      view.setBackgroundColor(Color.GREEN);
                     Log.i("Swipe Action", getAction().toString());
                     Object listItem = listView1.getItemAtPosition(position);
                     Intent i = new Intent(getApplicationContext(),
                             InteractionsActivity.class);
                     startActivity(i);

                  } 
                  else if(!swipeDetector.swipeDetected())
                  {
                      Log.i("stop value", "it was stoped");
                        view.setBackgroundColor(Color.WHITE);
                  }
          }
      });

---

但是当注释行mSwipeDetected=Action.None时；在我的SwipedTector案例MotionEvent.ACTION\u UP:语句中，“活动”正确打开，但当我返回“活动”时，listview项的背景色仍为绿色，而Log.istop值则已停止；：在我的活动中，else if语句无法调用。当我取消注释它Log.istop value时，它被停止了；可以调用，但listview项的背景色保持为白色，并且新活动不会打开。我应该如何实现它？

当您打开活动时，不要执行startActivity，而是使用startActivityForResult执行。这意味着您将能够检测到其他活动何时完成，用户何时返回到此活动。然后可以将颜色设置回白色

请在此处查看其工作原理：