Android "多方向"抽屉
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Android "多方向"抽屉
z.net 发表于5年前
Android "多方向"抽屉
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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:

01 OnTouchListener touchListener = new OnTouchListener() {
02     int initX;
03     int initY;
04     boolean setInitialPosition;
05     public boolean onTouch(View v, MotionEvent event) {
06         if (mState == State.ANIMATING) {
07             // we are animating
08             return false;
09         }
10 //          Log.d(TAG, "state: " + mState + " x: " + event.getX() + " y: " + event.getY());
11         int action = event.getAction();
12         if (action == MotionEvent.ACTION_DOWN) {
13             if (mBringToFront) {
14                 bringToFront();
15             }
16             initX = 0;
17             initY = 0;
18             if (mContent.getVisibility() == GONE) {
19                 // since we may not know content dimensions we use factors here
20                 if (mOrientation == VERTICAL) {
21                     initY = mPosition == TOP? -1 : 1;
22                 } else {
23                     initX = mPosition == LEFT? -1 : 1;
24                 }
25             }
26             setInitialPosition = true;
27         } else {
28             if (setInitialPosition) {
29                 // now we know content dimensions, so we multiply factors...
30                 initX *= mContentWidth;
31                 initY *= mContentHeight;
32                 // ... and set initial panel's position
33                 mGestureListener.setScroll(initX, initY);
34                 setInitialPosition = false;
35                 // for offsetLocation we have to invert values
36                 initX = -initX;
37                 initY = -initY;
38             }
39             // offset every ACTION_MOVE & ACTION_UP event
40             event.offsetLocation(initX, initY);
41         }
42         if (!mGestureDetector.onTouchEvent(event)) {
43             if (action == MotionEvent.ACTION_UP) {
44                 // tup up after scrolling
45                 post(startAnimation);
46             }
47         }
48         return false;
49     }
50 };

替换为:

01 OnTouchListener touchListener = new OnTouchListener() {
02     float touchX, touchY;
03  
04     public boolean onTouch(View v, MotionEvent event) {
05         if (mState == State.ANIMATING) {
06             // we are animating
07             return false;
08         }
09  
10         int action = event.getAction();
11         if (action == MotionEvent.ACTION_DOWN) {
12             if (mBringToFront) {
13                 bringToFront();
14             }
15             touchX = event.getX();
16             touchY = event.getY();
17         }
18  
19         if (!mGestureDetector.onTouchEvent(event)) {
20             if (action == MotionEvent.ACTION_UP) {
21                 // tup up after scrolling
22                 int size = (int) (Math.abs(touchX - event.getX()) + Math
23                         .abs(touchY - event.getY()));
24  
25                 if (size == mContentWidth || size == mContentHeight) {
26                     mState = State.ABOUT_TO_ANIMATE;
27                     //Log.e("size", String.valueOf(size));
28                     //Log.e(String.valueOf(mContentWidth),String.valueOf(mContentHeight));
29                 }
30  
31                 post(startAnimation);
32             }
33         }
34         return false;
35     }
36 };

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!

原文出处:http://blog.csdn.net/hellogv/article/details/6264706

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