解决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。有人已经封装好了该类，你只需引用就OK了。使用方法在你的Activity的oncreate()方法里调用AndroidBug5497Workaround.assistActivity(this);即可。注意：在setContentView(R.layout.xxx)之后调用。

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);  
    if(r.top==0){  
     r.top=statusBarH;//状态栏目的高度  
    }  
        return (r.bottom - r.top);  
    }  
   
}