getWindow().getDecorView().findViewById(android.R.id.content).setPadding(0, 0, 0, getNavigationBarHeight());

public int getNavigationBarHeight() {
    boolean hasMenuKey = ViewConfiguration.get(this).hasPermanentMenuKey();
    boolean hasBackKey = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);
    if (!hasMenuKey && !hasBackKey) {
      Resources resources = getResources();
      int resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
      //获取NavigationBar的高度
      int height = resources.getDimensionPixelSize(resourceId);
      return height;
    } else {
      return 0;
    }
  }