Android 输入法将底部布局顶上去遮挡布局问题

最近在项目中遇到使用ReletiveLayout将View固定在底部，但弹出输入框时底部的View被顶上去的问题， 尝试了很多解决办法 ，如下：
方法一：在你的activity中的oncreate中setContentView之前写上这个代码getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);
方法二：在项目的AndroidManifest.xml文件中界面对应的<activity>里加入android:windowSoftInputMode="stateVisible|adjustResize"，这样会让屏幕整体上移。如果加上的是
android:windowSoftInputMode="adjustPan"这样键盘就会覆盖屏幕。
方法三：把顶级的layout替换成ScrollView，或者说在顶级的Layout上面再加一层ScrollView的封装。这样就会把软键盘和输入框一起滚动了，软键盘会一直处于底部。
方法四：更换根布局
方法五：在根布局下加上fitsSystemwindows = true

尝试后发现：
方法一无效（ReletiveLayout下设置属性无效）
方法二无效（ReletiveLayout下设置属性无效）
方法三有效，但不适合 (布局没有超过屏幕，使用ScroollView使得View都挨在一起，只能通过magin值控制距离，不准确)
方法四无效
方法五无效

试过这么多都没用，真没办法了，最后只能监听软键盘的显示和隐藏来控制 底部布局的显隐，这样可以解决问题，不过有点闪动，问题不是很大。

照搬的代码，监听代码如下 ：

public class KeyboardStateObserver {

private static final String TAG = KeyboardStateObserver.class.getSimpleName();

public static KeyboardStateObserver getKeyboardStateObserver(Activity activity) {
    return new KeyboardStateObserver(activity);
}

private View mChildOfContent;
private int usableHeightPrevious;
private OnKeyboardVisibilityListener listener;

public void setKeyboardVisibilityListener(OnKeyboardVisibilityListener listener) {
    this.listener = listener;
}

private KeyboardStateObserver(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();
        }
    });
}

private void possiblyResizeChildOfContent() {
    int usableHeightNow = computeUsableHeight();
    if (usableHeightNow != usableHeightPrevious) {
        int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
        int heightDifference = usableHeightSansKeyboard - usableHeightNow;
        if (heightDifference > (usableHeightSansKeyboard / 4)) {
            if (listener != null) {
                listener.onKeyboardShow();
            }
        } else {
            if (listener != null) {
                listener.onKeyboardHide();
            }
        }
        usableHeightPrevious = usableHeightNow;
        Log.d(TAG,"usableHeightNow: " + usableHeightNow + " | usableHeightSansKeyboard:" + usableHeightSansKeyboard + " | heightDifference:" + heightDifference);
    }
}

private int computeUsableHeight() {
    Rect r = new Rect();
    mChildOfContent.getWindowVisibleDisplayFrame(r);

    Log.d(TAG,"rec bottom>" + r.bottom + " | rec top>" + r.top);
    return (r.bottom - r.top);// 全屏模式下： return r.bottom
}

public interface OnKeyboardVisibilityListener {
    void onKeyboardShow();

    void onKeyboardHide();
}

}

在界面中使用：
KeyboardStateObserver.getKeyboardStateObserver(this).
setKeyboardVisibilityListener(new KeyboardStateObserver.OnKeyboardVisibilityListener() {
@Override
public void onKeyboardShow() {
Toast.makeText(MainActivity.this,"键盘弹出",Toast.LENGTH_SHORT).show();
}

     @Override
     public void onKeyboardHide() {
         Toast.makeText(MainActivity.this,"键盘收回",Toast.LENGTH_SHORT).show();
     }
 });