android 键盘弹起 UI上移

private ViewTreeObserver.OnGlobalLayoutListener mLayoutChangeListener;private boolean mIsSoftKeyboardShowing = false;@Overridepublic void onCreate(Bundle saveBundleInstance){    super.onCreate(saveBundleInstance);    setContentView(R.layout.login_activity);    mLayoutChangeListener = new ViewTreeObserver.OnGlobalLayoutListener() {        @Override        public void onGlobalLayout() {            //判断窗口可见区域大小            Rect r = new Rect();            getWindow().getDecorView().getWindowVisibleDisplayFrame(r);            Point point = new Point();            getWindowManager().getDefaultDisplay().getSize(point);            final int screenHeight = point.y;            //如果屏幕高度和Window可见区域高度差值大于整个屏幕高度的1/3，则表示软键盘显示中，否则软键盘为隐藏状态            int heightDifference = screenHeight - r.bottom;            Log.i(TAG, "the keyboard height is " + heightDifference);            boolean isKeyboardUp = heightDifference > (screenHeight - r.top)/3;            if (isKeyboardUp && ! mIsSoftKeyboardShowing){                Log.i(TAG, "keyboard up");                mIsSoftKeyboardShowing = true;                adjustLayoutDependKeyboard(true, heightDifference);            }else if(!isKeyboardUp && mIsSoftKeyboardShowing){                Log.i(TAG, "keyboard down");                mIsSoftKeyboardShowing = false;                adjustLayoutDependKeyboard(false, heightDifference);            }        }    };    //设置一个监听，用于捕获键盘的弹出    getWindow().getDecorView().getViewTreeObserver().addOnGlobalLayoutListener(mLayoutChangeListener);}/** * 设置中间布局 * @param isVisible * @param keyboardHeight */void adjustLayoutDependKeyboard(boolean isVisible, int keyboardHeight){    LinearLayout middleLayout = (LinearLayout) findViewById(R.id.middle_layout);    FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) middleLayout.getLayoutParams();    if (isVisible){        params.gravity = Gravity.BOTTOM;        params.bottomMargin = 10+keyboardHeight;    }else{        params.gravity = Gravity.CENTER;        params.bottomMargin = 0;    }    middleLayout.setLayoutParams(params);}@Overridepublic void onDestroy(){    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN){        getWindow().getDecorView().getViewTreeObserver().removeOnGlobalLayoutListener(mLayoutChangeListener);    }else{        getWindow().getDecorView().getViewTreeObserver().removeGlobalOnLayoutListener(mLayoutChangeListener);    }    super.onDestroy();
}
参考文献：http://blog.csdn.net/ccpat/article/details/46730771
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