AndroidBug5497Workaround

importandroid.app.Activity;

importandroid.content.Context;

importandroid.graphics.Rect;

importandroid.util.DisplayMetrics;

importandroid.view.Display;

importandroid.view.View;

importandroid.view.ViewTreeObserver;

importandroid.view.WindowManager;

importandroid.widget.FrameLayout;

importjava.lang.reflect.Method;

public class AndroidBug5497Workaround {

Contextcontext;

// 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 voidassistActivity (Activity activity,Context context) {

newAndroidBug5497Workaround(activity,context);

}

privateViewmChildOfContent;

private intusableHeightPrevious;

privateFrameLayout.LayoutParamsframeLayoutParams;

privateAndroidBug5497Workaround(Activity activity,Context context) {

this.context= context;

FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);

mChildOfContent= content.getChildAt(0);

mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(newViewTreeObserver.OnGlobalLayoutListener() {

public voidonGlobalLayout() {

possiblyResizeChildOfContent();

}

});

frameLayoutParams= (FrameLayout.LayoutParams)mChildOfContent.getLayoutParams();

}

private voidpossiblyResizeChildOfContent() {

intusableHeightNow = computeUsableHeight();

if(usableHeightNow !=usableHeightPrevious) {

intusableHeightSansKeyboard =mChildOfContent.getRootView().getHeight();

intheightDifference = usableHeightSansKeyboard - usableHeightNow;

if(heightDifference > (usableHeightSansKeyboard/4)) {

// keyboard probably just became visible

frameLayoutParams.height= usableHeightSansKeyboard - heightDifference;

}else{

// keyboard probably just became hidden

frameLayoutParams.height= usableHeightSansKeyboard-getBottomStatusHeight(context);

}

mChildOfContent.requestLayout();

usableHeightPrevious= usableHeightNow;

}

}

private intcomputeUsableHeight() {

Rect r =newRect();

mChildOfContent.getWindowVisibleDisplayFrame(r);

return(r.bottom);

}

public static intgetDpi(Context context){

intdpi =0;

WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);

Display display = windowManager.getDefaultDisplay();

DisplayMetrics displayMetrics =newDisplayMetrics();

@SuppressWarnings("rawtypes")

Class c;

try{

c = Class.forName("android.view.Display");

@SuppressWarnings("unchecked")

Method method = c.getMethod("getRealMetrics",DisplayMetrics.class);

method.invoke(display, displayMetrics);

dpi=displayMetrics.heightPixels;

}catch(Exception e){

e.printStackTrace();

}

returndpi;

}

/**

* 获取 虚拟按键的高度

*@paramcontext

*@return

*/

public static  intgetBottomStatusHeight(Context context){

inttotalHeight =getDpi(context);

intcontentHeight =getScreenHeight(context);

returntotalHeight  - contentHeight;

}

/**

* 获得屏幕高度

*

*@paramcontext

*@return

*/

public static intgetScreenHeight(Context context)

{

WindowManager wm = (WindowManager) context

.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics outMetrics =newDisplayMetrics();

wm.getDefaultDisplay().getMetrics(outMetrics);

returnoutMetrics.heightPixels;

}

}