getContentResolver().registerContentObserver(Settings.System.getUriFor("navigationbar_is_min"), true, mNavigationStatusObserver);

private ContentObserver mNavigationStatusObserver = new ContentObserver(new Handler()) {
    @Override
    public void onChange(boolean selfChange) {
      int navigationBarIsMin = Settings.System.getInt(getContentResolver(),
          "navigationbar_is_min", 0);
      if (navigationBarIsMin == 1) {//導航鍵隱藏了
        Log.e("導航鍵隱藏了", "-----");
        gridView_Home.getViewTreeObserver().addOnGlobalLayoutListener(HomeActivity.this);
      } else {//導航鍵顯示了
        Log.e("導航鍵顯示了", "-----");
        gridView_Home.getViewTreeObserver().addOnGlobalLayoutListener(HomeActivity.this);
      }
    }
  };

 @Override
  public void onGlobalLayout() {
    refreshGridViewHeight();
  }

private void refreshGridViewHeight() {
    gridView_Home.post(new Runnable() {
      @Override
      public void run() {
        //獲取到寬度和高度后，可用于計算
        int height = gridView_Home.getHeight();
        //根據(jù)屏幕高度計算單個菜單的高度，保證屏幕能被填滿
        final int itemHeight = height / 3 - 3;
        runOnUiThread(new Runnable() {
          @Override
          public void run() {
            homeMenuAdapter.setIemtHeight(itemHeight);
            gridView_Home.setAdapter(homeMenuAdapter);
            mPresenter.refushGridData();
            if (Build.VERSION.SDK_INT < 16) {
              gridView_Home.getViewTreeObserver().removeGlobalOnLayoutListener(HomeActivity.this);
            } else {
              gridView_Home.getViewTreeObserver().removeOnGlobalLayoutListener(HomeActivity.this);
            }
          }
        });
      }
    });

getContentResolver().unregisterContentObserver(mNavigationStatusObserver);