系统手势导航-虚拟导航切换

问题讨论-需求场景

何为手势和物理按键、虚拟导航

Android11 开始支持了手势操作，如大家目前手机基本上都是手势操作形式；早期都是物理按键或者虚拟按键的操作。

手势导航和虚拟导航如何选择

系统层面：设置->系统->手势->手势切换

如何应用程序中让用户自己选择，自由选择设置

强制手势或者底部虚拟导航

定制的很多案子，强制使用手势或者底部虚拟导航：手势导航和虚拟导航二选一，那么如何定制客户选择其一时候有要求虚拟导航或者底部导航，不允许修改的。如何不让用户修改。

参考资料

Android导航方式切换
SystemUI导航栏

如何配置导航方式

mtk 、RK 配置都在同一个路径下，修改文件

\frameworks\base\core\res\res\values\config.xml <!-- Controls the navigation bar interaction mode:0: 3 button mode (back, home, overview buttons)1: 2 button mode (back, home buttons + swipe up for overview)2: gestures only for back, home and overview --><integer name="config_navBarInteractionMode">0</integer>

应用层如何设置导航方式

源码分析：

/packages/apps/Settings/src/com/android/settings/gestures/SystemNavigationGestureSettings.java

导航栏切换逻辑在 SystemNavigationGestureSettings.java 文件中

在线源码SystemNavigationGestureSettings.java 源码

获取当前导航方式和设置导航方式核心代码如下

@VisibleForTesting
202      static String getCurrentSystemNavigationMode(Context context) {
203          if (SystemNavigationPreferenceController.isGestureNavigationEnabled(context)) {
204              return KEY_SYSTEM_NAV_GESTURAL;
205          } else if (SystemNavigationPreferenceController.is2ButtonNavigationEnabled(context)) {
206              return KEY_SYSTEM_NAV_2BUTTONS;
207          } else {
208              return KEY_SYSTEM_NAV_3BUTTONS;
209          }
210      }
211  
212      @VisibleForTesting
213      static void setCurrentSystemNavigationMode(IOverlayManager overlayManager, String key) {
214          String overlayPackage = NAV_BAR_MODE_GESTURAL_OVERLAY;
215          switch (key) {
216              case KEY_SYSTEM_NAV_GESTURAL:
217                  overlayPackage = NAV_BAR_MODE_GESTURAL_OVERLAY;
218                  break;
219              case KEY_SYSTEM_NAV_2BUTTONS:
220                  overlayPackage = NAV_BAR_MODE_2BUTTON_OVERLAY;
221                  break;
222              case KEY_SYSTEM_NAV_3BUTTONS:
223                  overlayPackage = NAV_BAR_MODE_3BUTTON_OVERLAY;
224                  break;
225          }
226  
227          try {
228              overlayManager.setEnabledExclusiveInCategory(overlayPackage, USER_CURRENT);
229          } catch (RemoteException e) {
230              throw e.rethrowFromSystemServer();
231          }
232      }

获取当前导航方式

Settings数据库中：

adb shell settings get Secure navigation_mode

位置：

    frameworks/base/core/java/android/provider/Settings.java/*** Navigation bar mode.*  0 = 3 button*  1 = 2 button*  2 = fully gestural* @hide*/@Readablepublic static final String NAVIGATION_MODE ="navigation_mode";

所以直接通过系统标准API 获取Setting 相关属性值来获取当前导航方式

 public static Mode getNavigationMode(Context context) {try {ContentResolver resolver = context.getApplicationContext().getContentResolver();int mode = Settings.Secure.getInt(resolver, "navigation_mode");if (mode == 0) {return Mode.THREEBUTTON;} else if (mode == 2) {return Mode.GESTURAL;}} catch (Exception e) {e.printStackTrace();}return null;}

设置导航栏

回归到 SystemNavigationGestureSettings.java 类的 setCurrentSystemNavigationMode 方法，最终调用

 overlayManager.setEnabledExclusiveInCategory(overlayPackage, USER_CURRENT);

思路：拿到 overlayManager 然后调用 setEnabledExclusiveInCategory 方法即可。

SystemNavigationGestureSettings 类中，overlayManager 获取：不就是获取OVERLAY_SERVICE 的服务吗

       mOverlayManager = IOverlayManager.Stub.asInterface(ServiceManager.getService(Context.OVERLAY_SERVICE));

在应用中获取思路

Object mIOverlayManager = context.getSystemService("overlay")

然后调用 setEnabledExclusiveInCategory 方法，但是服务的方法本身不是对外释放的，那就反射。

@Overridepublic boolean setEnabledExclusiveInCategory(@Nullable String packageName,final int userIdArg) {if (packageName == null) {return false;}try {traceBegin(TRACE_TAG_RRO, "OMS#setEnabledExclusiveInCategory " + packageName);final OverlayIdentifier overlay = new OverlayIdentifier(packageName);final int realUserId = handleIncomingUser(userIdArg,"setEnabledExclusiveInCategory");enforceActor(overlay, "setEnabledExclusiveInCategory", realUserId);final long ident = Binder.clearCallingIdentity();try {synchronized (mLock) {try {mImpl.setEnabledExclusive(overlay,true /* withinCategory */, realUserId).ifPresent(OverlayManagerService.this::updateTargetPackagesLocked);return true;} catch (OperationFailedException e) {return false;}}} finally {Binder.restoreCallingIdentity(ident);}} finally {traceEnd(TRACE_TAG_RRO);}}

规避客户切换导航栏

在默认了系统导航栏上面已经给出了用户可以切换导航栏的。很多产品在默认导航栏后不允许客户切换导航方式的。那么就需要在系统设置里面规避，隐藏切换方式。

涉及到的源码修改：

/packages/apps/Settings/src/com/android/settings/gestures/SystemNavigationPreferenceController.javagetAvailabilityStatus 方法，修改如下：@Overridepublic int getAvailabilityStatus() {//  return isGestureAvailable(mContext) ? UNSUPPORTED_ON_DEVICE : UNSUPPORTED_ON_DEVICE;return isGestureAvailable(mContext) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;}

  如果允许设置里面修改，用默认的：return isGestureAvailable(mContext) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;如果不允许修改，那么 返回如下：//  return isGestureAvailable(mContext) ? UNSUPPORTED_ON_DEVICE : UNSUPPORTED_ON_DEVICE;

其它扩展知识

导航栏高度：navigation_bar_height

frameworks/base/core/res/res/values/dimens.xml  <!-- Height of the bottom navigation / system bar. --><dimen name="navigation_bar_height">48dp</dimen><!-- Height of the bottom navigation bar in portrait; often the same as @dimen/navigation_bar_height --><dimen name="navigation_bar_height_landscape">48dp</dimen>

涉及到部分图示和工具类

在这里插入图片描述

设置和获取手导航


import android.annotation.SuppressLint;
import android.content.ContentResolver;
import android.content.Context;
import android.os.UserHandle;
import android.provider.Settings;import java.lang.reflect.Constructor;
import java.lang.reflect.Method;public class NavigationHelper {/*** 设置导航模式** @param context* @param mode    GESTURAL：手势 TWOBUTTON：二按钮 THREEBUTTON：三按钮*/public static void setNavigationMode(Context context, Mode mode) {try {//  Object mIOverlayManager = context.getSystemService("overlay");@SuppressLint("WrongConstant") Object mIOverlayManager = context.getSystemService(Context.OVERLAY_SERVICE);Method setEnabledExclusiveInCategory = mIOverlayManager.getClass().getMethod("setEnabledExclusiveInCategory", String.class, UserHandle.class);setEnabledExclusiveInCategory.setAccessible(true);String overlayPackage = "com.android.internal.systemui.navbar.gestural";if (mode == Mode.TWOBUTTON) {overlayPackage = "com.android.internal.systemui.navbar.twobutton";} else if (mode == Mode.THREEBUTTON) {overlayPackage = "com.android.internal.systemui.navbar.threebutton";}UserHandle userHandle = (UserHandle) newInstance(UserHandle.class, new Class[]{int.class}, 0);setEnabledExclusiveInCategory.invoke(mIOverlayManager, overlayPackage, userHandle);} catch (Throwable e) {e.printStackTrace();}}/*** 获取导航模式* @param context* @return*/public static Mode getNavigationMode(Context context) {try {ContentResolver resolver = context.getApplicationContext().getContentResolver();int mode = Settings.Secure.getInt(resolver, "navigation_mode");if (mode == 0) {return Mode.THREEBUTTON;} else if (mode == 2) {return Mode.GESTURAL;}} catch (Exception e) {e.printStackTrace();}return null;}/*** 开启经典导航模式** @param enable*/public static void setClassicNavigationMode(boolean enable) {try {Class c = Class.forName("android.os.SystemProperties");Method method = c.getMethod("set", String.class, String.class);method.setAccessible(true);method.invoke(null, "persist.sys.classic.navigation.mode", String.valueOf(enable));} catch (Throwable e) {e.printStackTrace();}}private static Object newInstance(Class clazz, Class[] argsType, Object... args) {Object instance = null;try {Constructor constructor = clazz.getConstructor(argsType);constructor.setAccessible(true);instance = constructor.newInstance(args);} catch (Throwable e) {e.printStackTrace();}return instance;}public enum Mode {GESTURAL,TWOBUTTON,THREEBUTTON}}