支持android13以上系统，需要系统签名。
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");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}}
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