关于NotificationListenerService监听时有失败的处理

• 问题由来
  去年进入一家专业做智能穿戴设备的公司，在项目中需要监听系统通知栏变化（主要是IM类app的信息获取到后推送到用户的手环），在继承android系统提供的NotificationListenerService这个类使用时会出现一个问题：应用进程被杀后再次启动时，服务不生效，导致通知栏有内容变更，服务无法感知

• 解决方法

  • 第一种方法是：重启手机，但是用户体验不好
  • 第二种方法是：在app每次启动时检测NotificationListenerService是否生效，不生效重新开启

• 代码

public class NotificationCollectorMonitorService extends Service {
    @Override
    public void onCreate() {
        super.onCreate();
        ensureCollectorRunning();
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }
    //确认NotificationMonitor是否开启
    private void ensureCollectorRunning() {
        ComponentName collectorComponent = new ComponentName(this, NotificationMonitor.class);
        ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        boolean collectorRunning = false;
        List<ActivityManager.RunningServiceInfo> runningServices = manager.getRunningServices(Integer.MAX_VALUE);
        if (runningServices == null ) {
            return;
        }
        for (ActivityManager.RunningServiceInfo service : runningServices) {
            if (service.service.equals(collectorComponent)) {
                if (service.pid == Process.myPid() ) {
                    collectorRunning = true;
                }
            }
        }
        if (collectorRunning) {
            return;
        }
        toggleNotificationListenerService();
    }
    //重新开启NotificationMonitor
    private void toggleNotificationListenerService() {
        ComponentName thisComponent = new ComponentName(this,  NotificationMonitor.class);
        PackageManager pm = getPackageManager();
        pm.setComponentEnabledSetting(thisComponent, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
        pm.setComponentEnabledSetting(thisComponent, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);

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

• 代码说明
  
  • NotificationMonitor为继承NotificationListenerService的具体监听通知的处理类
  • 在Application的 onCreate方法中启动NotificationCollectorMonitorService

startService(new Intent(this, NotificationCollectorMonitorService.class))

• 不要忘记了在 AndroidManifest.xml注册此服务

    <service android:name=".NotificationCollectorMonitorService"/>