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本文來自http://blog.csdn.net/hellogv/ ，引用必須註明出處！

       在android上要實現類似Launch的抽屜效果，大家一定首先會想起SlidingDrawer。SlidingDrawer是android官方控制元件之一，本文的主角不是它，而是

       這個Panel控制元件可以輕易實現不同方向的抽屜效果，比SlidingDrawer有更強的擴充套件性！

       在多次使用Panel的過程中，發現Panel有個bug，會間斷性出現“閃爍”，也就是在onTouchListener裡面的觸發ACTION_DOWN後，抽屜瞬間彈出然後瞬間回收(版本日期為Feb 3, 2009)。把原Panel的OnTouchListener，即以下程式碼：

 OnTouchListener touchListener = new OnTouchListener() {  int initX;  int initY;  boolean setInitialPosition;  public boolean onTouch(View v, MotionEvent event) {   if (mState == State.ANIMATING) {    // we are animating    return false;   }//   Log.d(TAG, "state: " + mState + " x: " + event.getX() + " y: " + event.getY());   int action = event.getAction();   if (action == MotionEvent.ACTION_DOWN) {    if (mBringToFront) {     bringToFront();    }    initX = 0;    initY = 0;    if (mContent.getVisibility() == GONE) {     // since we may not know content dimensions we use factors here     if (mOrientation == VERTICAL) {      initY = mPosition == TOP? -1 : 1;     } else {      initX = mPosition == LEFT? -1 : 1;     }    }    setInitialPosition = true;   } else {    if (setInitialPosition) {     // now we know content dimensions, so we multiply factors...     initX *= mContentWidth;     initY *= mContentHeight;     // ... and set initial panel's position     mGestureListener.setScroll(initX, initY);     setInitialPosition = false;     // for offsetLocation we have to invert values     initX = -initX;     initY = -initY;    }    // offset every ACTION_MOVE & ACTION_UP event     event.offsetLocation(initX, initY);   }   if (!mGestureDetector.onTouchEvent(event)) {    if (action == MotionEvent.ACTION_UP) {     // tup up after scrolling     post(startAnimation);    }   }   return false;  } };

替換為：

 OnTouchListener touchListener = new OnTouchListener() {  float touchX, touchY;  public boolean onTouch(View v, MotionEvent event) {   if (mState == State.ANIMATING) {    // we are animating    return false;   }   int action = event.getAction();   if (action == MotionEvent.ACTION_DOWN) {    if (mBringToFront) {     bringToFront();    }    touchX = event.getX();    touchY = event.getY();   }   if (!mGestureDetector.onTouchEvent(event)) {    if (action == MotionEvent.ACTION_UP) {     // tup up after scrolling     int size = (int) (Math.abs(touchX - event.getX()) + Math       .abs(touchY - event.getY()));     if (size == mContentWidth || size == mContentHeight) {      mState = State.ABOUT_TO_ANIMATE;      //Log.e("size", String.valueOf(size));      //Log.e(String.valueOf(mContentWidth),String.valueOf(mContentHeight));     }     post(startAnimation);    }   }   return false;  } };

即可修復這個bug，並且也同樣實現了OnClickListener的功能，可以把原Panel的OnClickListener給刪掉了！

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