显示 DialogFragment 时隐藏系统导航栏

Question

我的应用程序是sticky immersive mode因为system navigation bar（我称之为 SNB）隐藏在我的应用程序的运行时间中。它运行良好但存在一个问题，就是每次我显示 a 时DialogFragment，都会出现 SNB。我怎么能隐藏它。我在活动类中编写了几行代码，使我的应用程序变为全屏和sticky immersive mode.MyActivity.java@Overrideprotected void onResume() {    super.onResume();    hideSystemUI();}@Overridepublic void onWindowFocusChanged(boolean hasFocus) {    super.onWindowFocusChanged(hasFocus);    hideSystemUI();}public void hideSystemUI() {    // Enables regular immersive sticky mode.    View decorView = getWindow().getDecorView();    decorView.setSystemUiVisibility(            View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION                    );}MyDialog.javapublic class MyDialog extends DialogFragment{    @NonNull    @Override    public Dialog onCreateDialog(Bundle savedInstanceState) {        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());        AlertDialog alertD = builder.create();        alertD.setView(view);        return alertD;    }    public void show() {        Activity activity = getActivity();        show(activity.getSupportFragmentManager(), "dialog");    }    @Override    public void onResume() {        super.onResume();        ViewGroup.LayoutParams params = getDialog().getWindow().getAttributes();        params.width = ViewGroup.LayoutParams.MATCH_PARENT;        params.height = ViewGroup.LayoutParams.WRAP_CONTENT;        getDialog().getWindow().setAttributes((WindowManager.LayoutParams) params);    }}我按照答案显示对话框而不显示 SNB：https ://stackoverflow.com/a/33589793/10467639但它没有按预期工作MyDialog dialog = new MyDialog();// Set the dialog to not focusable.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,        WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);dialog.show();// Set the dialog to focusable again.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

Answer 1

按照这个答案https://stackoverflow.com/a/23207365/8531215，我已经测试过并且工作正常！onCreateDialog()稍微修改一下方法

public Dialog onCreateDialog(Bundle savedInstanceState) {

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        AlertDialog alertD = builder.create();

        alertD.setView(view);

        Dialog dialog = alertD.create();

        dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

        //Show the dialog!

        dialog.show();

         //Set the dialog to immersive sticky mode

        dialog.getWindow().getDecorView().setSystemUiVisibility(

                View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY

                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);

        //Clear the not focusable flag from the window

        dialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

        return alertD;

}

Answer 2

根据这里的文档：

实施 onWindowFocusChanged()。如果获得窗口焦点，您可能需要重新隐藏系统栏。如果您失去窗口焦点，例如由于对话框或弹出菜单显示在您的应用程序上方，您可能想要取消您之前使用 Handler.postDelayed() 或类似的东西安排的任何未决的“隐藏”操作。

所以我建议你做的是，改变你的代码MyActivity.java：

@Override

public void onWindowFocusChanged(boolean hasFocus) {

    super.onWindowFocusChanged(hasFocus);

    hideSystemUI();

}

到：

@Override

public void onWindowFocusChanged(boolean hasFocus) {

     if (!hasFocus){

            //we lost focus due to DialogFragment

            hideSystemUI();            

        }

}