dialog.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
dialog.getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
     @Override
     public void onSystemUiVisibilityChange(int visibility) {
         int uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
         //布局位于狀態(tài)欄下方
         View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
         //全屏
         View.SYSTEM_UI_FLAG_FULLSCREEN |
         //隱藏導(dǎo)航欄
         View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
         View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
         uiOptions |= 0x00001000;
         dialog.getWindow().getDecorView().setSystemUiVisibility(uiOptions);
     }
});

private void fullScreenImmersive(View view) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
      int uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
        | View.SYSTEM_UI_FLAG_FULLSCREEN;
      view.setSystemUiVisibility(uiOptions);
    }
  }

  @Override
  public void show() {
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
    super.show();
    fullScreenImmersive(getWindow().getDecorView());
    this.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
  }