Android:像键盘锁屏一样锁定导航栏

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

public class LockScreenService extends Service {
    private WindowManager windowManager;
    private View lockView;

    @Override
    public void onCreate() {
        super.onCreate();
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        lockView = LayoutInflater.from(this).inflate(R.layout.lock_screen_layout, null);

        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
                        WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN |
                        WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
                PixelFormat.TRANSLUCENT);

        windowManager.addView(lockView, params);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (lockView != null) {
            windowManager.removeView(lockView);
        }
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- 在这里定义锁定导航栏的视图 -->

</RelativeLayout>

Intent intent = new Intent(context, LockScreenService.class);
context.startService(intent);