android - 使用全屏对话框时如何隐藏导航栏

Question

我正在使用全屏 ‍Dialog 以全屏模式显示 ExoPlayer 视频。我已经在托管 Dialog 的 Activity 的 onCreate 方法中使用以下代码来隐藏 Navigation Bar .

public class BaseActivity extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //Hide the navigation bar in the beginning
        final View decorView = getWindow().getDecorView();
        int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_FULLSCREEN;
        decorView.setSystemUiVisibility(uiOptions);

        //Set a system bar visibility change listener
        decorView.setOnSystemUiVisibilityChangeListener(
                new View.OnSystemUiVisibilityChangeListener() {
                    @Override
                    public void onSystemUiVisibilityChange(int visibility) {
                        if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
                            decorView.setSystemUiVisibility(
                                    View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                                            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
                        }
                    }
                }
        );


    }
}

问题是，一旦对话框打开，导航栏就会出现，我无法隐藏它。

private void openFullScreenDialog() {
    ((ViewGroup) mExoPlayerView.getParent()).removeView(mExoPlayerView);
    mFullScreenDialog.addContentView(mExoPlayerView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    mFullScreenIcon.setImageDrawable(ContextCompat.getDrawable(PlaybackActivity.this, R.drawable.ic_fullscreen_exit));
    mExoPlayerFullScreen = true;
    mFullScreenDialog.show();
    getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
    | View.SYSTEM_UI_FLAG_FULLSCREEN);
}

无论我为对话框或 setSystemUiVisibility() 使用什么选项，导航栏都会出现。

Answer 1

这样做:

decorView.setOnSystemUiVisibilityChangeListener(
        new View.OnSystemUiVisibilityChangeListener() {
            @Override
            public void onSystemUiVisibilityChange(int visibility) {
                getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
                getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
                getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

            }
        }
);

同样覆盖这个方法:

@Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus) {
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

        }
    }