關於NotificationListenerService監聽時有失敗的處理
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問題由來
去年進入一家專業做智能穿戴設備的公司，在項目中需要監聽系統通知欄變化（主要是IM類app的信息獲取到后推送到用戶的手環），在繼承Android系統提供的NotificationListenerService這個類使用時會出現一個問題：應用進程被殺后再次啟動時，服務不生效，導致通知欄有內容變更，服務無法感知 -
解決方法
- 第一種方法是：重啟手機，但是用戶體驗不好
- 第二種方法是：在app每次啟動時檢測NotificationListenerService是否生效，不生效重新開啟
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代碼
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; } //確認NotificationMonitor是否開啟 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(); } //重新開啟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; } }- 代碼說明
- NotificationMonitor為繼承NotificationListenerService的具體監聽通知的處理類
- 在Application的 onCreate方法中啟動NotificationCollectorMonitorService
startService(new Intent(this, NotificationCollectorMonitorService.class))- 不要忘記了在 AndroidManifest.xml注冊此服務
<service android:name=".NotificationCollectorMonitorService"/>