两个dialog叠加，后一个dialog消失，出现底部导航栏问题

第一个Dialog复写onWindowFocusChanged方法，当dialog在最前面试焦点是focus否则是true,当为true时，对dialog进行全屏显示（沉浸式）控制

 @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        Log.e("TAG", "onWindowFocusChanged: hasFocus"+hasFocus);
        if (hasFocus) {
            fullScreenImmersive(getWindow().getDecorView());
        }
    }

MyAlertDialog extends Dialog

  private void fullScreenImmersive(View view) {
        view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
                View.SYSTEM_UI_FLAG_FULLSCREEN);
    }

扩展
MyAlertDialog extends Dialog

 @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        Log.e("TAG", "onAttachedToWindow: ");
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus) {
            fullScreenImmersive(getWindow().getDecorView());
        }
    }

    @Override
    public void onWindowAttributesChanged(WindowManager.LayoutParams params) {
        super.onWindowAttributesChanged(params);
        Log.e("TAG", "onWindowAttributesChanged: ");
    }