Android提高第十九篇之"多方向"抽屉[转]

在android上要实现类似Launch的抽屉效果，大家一定首先会想起SlidingDrawer。SlidingDrawer是android官方控件之一，本文的主角不是它，而是民间的控件工具集合~~~android-misc-widgets。android-misc-widgets里面包含几个widget：Panel、SmoothButton、Switcher、VirtualKeyboard,还有一些动画特效，本文主要介绍抽屉容器Panel的用法。android-misc-widgets的google工程地址：-widgets/http://code.google.com/p/android-misc，工程代码中Panel的演示效果如下：

这个Panel控件可以轻易实现不同方向的抽屉效果，比SlidingDrawer有更强的扩展性！

在多次使用Panel的过程中，发现Panel有个bug，会间断性出现“闪烁”，也就是在onTouchListener里面的触发ACTION_DOWN后，抽屉瞬间弹出然后瞬间回收(版本日期为Feb 3, 2009)。把原Panel的OnTouchListener，即以下代码：

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;      }  };

替换为：

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;      }  };

即可修复这个bug，并且也同样实现了OnClickListener的功能，可以把原Panel的OnClickListener给删掉了！

本文来自http://blog.csdn.net/hellogv/article/details/6264706

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