键盘显示，隐藏的事件监听。

activity 中 监听 键盘的显示，隐藏， 需要自定义LinearLayout.

public class ResizeLayout extends LinearLayout {
    private OnResizeListener mListener;

    public interface OnResizeListener {
        void OnResize(int w, int h, int oldw, int oldh);
    }

    public void setOnResizeListener(OnResizeListener l) {
        mListener = l;
    }

    public ResizeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        if (mListener != null) {
            mListener.OnResize(w, h, oldw, oldh);
        }
    }
}

监听onResize 的回调。
在全屏状态下，回调不起作用， AndroidBug5497Workaround 解决。

public class AndroidBug5497Workaround {
    private keywordShowHide listener;
    //全屏下键盘事件不影响布局改变
    // 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.


    private View mChildOfContent;
    private int usableHeightPrevious;
    private FrameLayout.LayoutParams frameLayoutParams;

    public AndroidBug5497Workaround(Activity activity,keywordShowHide listener) {
        this.listener = listener;
        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
                if(listener!=null){
                    listener.show();
                }
                frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
            } else {
                // keyboard probably just became hidden
                if(listener!=null){
                    listener.hide();
                }
                frameLayoutParams.height = usableHeightSansKeyboard;

                mChildOfContent.requestLayout();
            }
            usableHeightPrevious = usableHeightNow;
        }
    }

    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
        return (r.bottom - r.top);
    }


    public interface keywordShowHide{
        public void show();
        public void hide();
    }

}