解决安卓全屏“FLAG_FULLSCREEN”状态下“adjustResize”失效，全屏状态下WebView的输入框被软键盘挡住的问题

　　目前，5+SDK在全屏模式下问题比较多，比如webview的show和hide方法会概率性失效（调用后没反应）、软键盘挡住当前具有焦点的文本输入框等问题。
　　本篇文章的意图，希望官方看到后可以引入到5+SDK中，以便解决全屏模式下，软键盘盖住文本框的问题。
　　沿着这个问题的线索，可以追溯到：http://code.google.com/p/android/issues/detail?id=5497 ，安卓官方问题回馈帖，这个问题的代号为“5497” ，就这个问题帖的回复来看，该问题困惑了许多人数年之久，问题发布日期“Dec 16, 2009”，现在我在安卓4.4.2环境运行，这个问题依旧存在。在此推荐这其中的一个解决方法，来自：stackoverflow.com，实测有效。

[java] view plaincopy  
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);  
    }  
}  

在Activity/Fragment的onCreate()/onCreateView()里调用AndroidBug5497Workaround.assistActivity(Activity)；代码搬运，希望能够帮助到各位。

另见：
必须在setContentView()后面添加AndroidBug5497Workaround.assistActivity(this);

Based on yghm is workaround, I coded up a convenience class that allows me to solve the problem with a one-liner (after adding the new class to my source code of course). The one-liner is:  
     AndroidBug5497Workaround.assistActivity(this);  
And the implementation class is:  
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);  
    }  
}  
Hope this helps someone.