Android SystemUI 导航栏动态显示隐藏

本文主要是介绍Android SystemUI 导航栏动态显示隐藏，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

本文实现导航栏动态显示隐藏功能。代码基于Android 9.0修改，Android 11 上代码结构有所不同，大的流程差不多，也可以参考本文。

1、导航栏创建加载及隐藏：

 frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

    ...try {// boolean showNav = mWindowManagerService.hasNavigationBar();// 添加自定义控制状态栏的 Settings.system 属性值,控制初始化时是否创建状态栏boolean showNav = Settings.system.getInt(mContext.getContentResolver(), "nav_bar_mode", 0) == 0;// 注册属性值变化监听mContext.getContentResolver().registerContentObserver(Settings.System.getUriFor("nav_bar_mode"), false, new SettingsObserver(mHandler), UserHandle.USER_ALL);if (DEBUG) Log.v(TAG, "hasNavigationBar=" + showNav);if (showNav) {createNavigationBar();}} catch (RemoteException ex) {// no window manager? good luck with that}...// 自定义 nav_bar_mode 属性值的监听private final class SettingsObserver extends ContentObserver {public SettingsObserver(Handler handler) {super(handler);}@Overridepublic void onChange(boolean selfChange, Uri uri) {int navMode = Settings.Secure.getInt(mContext.getContentResolver(), "nav_bar_mode", 0);Log.i("TAG", "navMode = " + navMode);switch (navMode) {case 0:createNavigationBar();break;case 1:mContext.getSystemService(WindowManager.class).removeView(mNavigationBarView);break;default:Log.w(TAG, "Unknown mode");break;}}}

 这里主要了解导航栏的加载是由系统的 WindowManager 加载，通过addView进行加载显示，所以我们也可以通过 removeView 去进行删除隐藏。

2、加载 view 的源码：

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java

    public static View create(Context context, FragmentListener listener) {WindowManager.LayoutParams lp = new WindowManager.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT,WindowManager.LayoutParams.TYPE_NAVIGATION_BAR,WindowManager.LayoutParams.FLAG_TOUCHABLE_WHEN_WAKING| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL| WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH| WindowManager.LayoutParams.FLAG_SPLIT_TOUCH| WindowManager.LayoutParams.FLAG_SLIPPERY,PixelFormat.TRANSLUCENT);lp.token = new Binder();lp.setTitle("NavigationBar");lp.accessibilityTitle = context.getString(R.string.nav_bar);lp.windowAnimations = 0;View navigationBarView = LayoutInflater.from(context).inflate(R.layout.navigation_bar_window, null);if (DEBUG) Log.v(TAG, "addNavigationBar: about to add " + navigationBarView);if (navigationBarView == null) return null;context.getSystemService(WindowManager.class).addView(navigationBarView, lp);FragmentHostManager fragmentHost = FragmentHostManager.get(navigationBarView);NavigationBarFragment fragment = new NavigationBarFragment();fragmentHost.getFragmentManager().beginTransaction().replace(R.id.navigation_bar_frame, fragment, TAG).commit();fragmentHost.addTagListener(TAG, listener);return navigationBarView;}

主要就是 context.getSystemService(WindowManager.class).addView(navigationBarView, lp); 这句。

这篇关于Android SystemUI 导航栏动态显示隐藏的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---