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Android提高第十九篇之 多方向 抽屉

2011-03-22

摘自blog.csdn.net/hellogv        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~~~andro

摘自blog.csdn.net/hellogv

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/https://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 panels 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!

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