NotificationListenerService失效的两种情况

来源：互联网发布：淘宝电信手机编辑：程序博客网时间：2024/06/05 05:57

1、在NotificationListenerService onCreate或Onbind过程中crash。这种情况只能重启手机，即使修改了crash部分的代码重新安装程序也一样不能收到通知。原因是NLS在registerListenerService时会有一个tag标记（可能是为了防止一个service多次启动）bind前会加tag,bind成功结束后会去掉tag。那么在bind时cash标签不会去掉，就导致NLS无效，即使想重新注册，因为有一个tag存在，也会直接return。

private void registerListenerService(final ComponentName name, final int userid) {      //servicesBindingTag可以理解为需要启动的service的标签      final String servicesBindingTag = name.toString() + "/" + userid;      //如果mServicesBinding中已经包含正在处理的service则直接return退出      if (mServicesBinding.contains(servicesBindingTag)) {      // stop registering this thing already! we're working on it         return;      }      //将准备启动的service标签添加到mServicesBinding中      mServicesBinding.add(servicesBindingTag);        //... ...省略      //使用bindServiceAsUser启动service      Intent intent = new Intent(NotificationListenerService.SERVICE_INTERFACE);      intent.setComponent(name);        intent.putExtra(Intent.EXTRA_CLIENT_LABEL,              R.string.notification_listener_binding_label);      intent.putExtra(Intent.EXTRA_CLIENT_INTENT, PendingIntent.getActivity(              mContext, 0, new Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS), 0));        try {          if (DBG) Slog.v(TAG, "binding: " + intent);          if (!mContext.bindServiceAsUser(intent,                  new ServiceConnection() {                      INotificationListener mListener;                      @Override                      public void onServiceConnected(ComponentName name, IBinder service) {                          synchronized (mNotificationList) {                              //服务成功启动之后删除标签                              mServicesBinding.remove(servicesBindingTag);                              try {                                  mListener = INotificationListener.Stub.asInterface(service);                                  NotificationListenerInfo info = new NotificationListenerInfo(                                          mListener, name, userid, this);                                  service.linkToDeath(info, 0);                                  mListeners.add(info);                              } catch (RemoteException e) {                                  // already dead                              }                          }                      }                        @Override                      public void onServiceDisconnected(ComponentName name) {                          Slog.v(TAG, "notification listener connection lost: " + name);                      }                  },                  Context.BIND_AUTO_CREATE,                  new UserHandle(userid)))          {              //绑定服务失败后删除标签              mServicesBinding.remove(servicesBindingTag);              Slog.w(TAG, "Unable to bind listener service: " + intent);              return;          }      } catch (SecurityException ex) {          Slog.e(TAG, "Unable to bind listener service: " + intent, ex);          return;      }  }  }

2、被第三方软件杀掉或者service被系统杀掉，可以通过重新绑定服务使NLS重新生效。可以通过adb shell dumpsys notification命令查看手机里enable和live的notificationlistener。如果live里没有说明你的服务没有存活，也就是NLS的无效。可以通过一个函数来重新绑定：

public static void toggleNotificationListenerService(Context context) {        Log.e(TAG,"toggleNLS");        PackageManager pm = context.getPackageManager();        pm.setComponentEnabledSetting(                new ComponentName(context, com.zhenglei.launcher_test.qianghongbao.NotificationService.class),                PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);        pm.setComponentEnabledSetting(                new ComponentName(context, com.zhenglei.launcher_test.qianghongbao.NotificationService.class),                PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);    }

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