android 软键盘在全屏下设置adjustResize无效的问题

全屏模式下，即使将activity的windowSoftInputMode的属性设置为：adjustResize，在键盘显示时它未将Activity的Screen向上推动，所以你Activity的view的根树的尺寸是没有变化的。在这种情况下，你也就无法得知键盘的尺寸，对根view的作相应的推移。全屏下的键盘无法Resize的问题从2.1就已经存在了，直到现在google还未给予解决。
感谢Ricardo提供的轮子，他在stackoverflow找到了解决方案。有人已经封装好了该类，你只需引用就OK了
参考：http://stackoverflow.com/questions/7417123/android-how-to-adjust-layout-in-full-screen-mode-when-softkeyboard-is-visible/19494006#19494006

解决问题：例如聊天输入条（android:layout_alignParentBottom=”true”） 当软键盘弹出的时候 不浮起来
用 法： 在setContentView(R.layout.xxx);之后调用AndroidBug5497Workaround.assistActivity(this);

AndroidBug5497Workaround.java:

> import android.app.Activity; import android.graphics.Rect; import
> android.view.View; import android.view.ViewTreeObserver; import
> android.widget.FrameLayout;
> 
>   public class AndroidBug5497Workaround {
>     // For more information, see https://code.google.com/p/android/issues/detail?id=5497
>     // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.
> 
>     public static void assistActivity (Activity activity) {
>         new AndroidBug5497Workaround(activity);
>     }
> 
>     private View mChildOfContent;
>     private int usableHeightPrevious;
>     private FrameLayout.LayoutParams frameLayoutParams;
> 
>     private AndroidBug5497Workaround(Activity activity) {
>         FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
>         mChildOfContent = content.getChildAt(0);
>         mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new
> ViewTreeObserver.OnGlobalLayoutListener() {
>             public void onGlobalLayout() {
>                 possiblyResizeChildOfContent();
>             }
>         });
>         frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
>     }
> 
>     private void possiblyResizeChildOfContent() {
>         int usableHeightNow = computeUsableHeight();
>         if (usableHeightNow != usableHeightPrevious) {
>             int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
>             int heightDifference = usableHeightSansKeyboard - usableHeightNow;
>             if (heightDifference > (usableHeightSansKeyboard/4)) {
>                 // keyboard probably just became visible
>                 frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
>             } else {
>                 // keyboard probably just became hidden
>                 frameLayoutParams.height = usableHeightSansKeyboard;
>             }
>             mChildOfContent.requestLayout();
>             usableHeightPrevious = usableHeightNow;
>         }
>     }
> 
>     private int computeUsableHeight() {
>         Rect r = new Rect();
>         mChildOfContent.getWindowVisibleDisplayFrame(r);
>         return (r.bottom - r.top);
>     }
> 
> }