Android 当应用程序处于后台时发送通知

当我的应用程序处于后台时，我正在发送通知。当应用程序处于后台时，通知正在发送，但当我单击通知并打开应用程序时，应用程序正在崩溃。我需要发送通知时，应用程序只是在后台，我一直这样做的iBeacon开发

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); 
         notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            ;


           new ForegroundCheckTask().execute();

    }


    class ForegroundCheckTask extends AsyncTask<Context, Void, Boolean> {

          @Override
          protected Boolean doInBackground(Context... params) {

              postNotificationUBCity("Entered region");
            final Context context = params[0].getApplicationContext();

            return isAppOnForeground(context);


          }

          private boolean isAppOnForeground(Context context) {
            ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
            List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
            if (appProcesses == null) {
              return false;
            }
            final String packageName = context.getPackageName();
            for (RunningAppProcessInfo appProcess : appProcesses) {
              if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND && appProcess.processName.equals(packageName)) {
                return true;
              }
            }
            return false;
          }
        }

---

为了这个目的，我不会选择AsyncTask

如果要在应用程序处于后台模式时发送通知，请尝试在onPause方法中使用以下代码：

添加适当的通知：

private void addNotification(Context context, String message) {

 int icon = R.drawable.ic_launcher;
 long when = System.currentTimeMillis();
 String appname = context.getResources().getString(R.string.app_name);
 NotificationManager notificationManager = (NotificationManager) context
 .getSystemService(Context.NOTIFICATION_SERVICE);

 Notification notification;
 PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
 new Intent(context, myactivity.class), 0);


 NotificationCompat.Builder builder = new NotificationCompat.Builder(
 context);
 notification = builder.setContentIntent(contentIntent)
 .setSmallIcon(icon).setTicker(appname).setWhen(0)
 .setAutoCancel(true).setContentTitle(appname)
 .setContentText(message).build();

 notificationManager.notify(0 , notification);

 }

不要忘记在您的AndroidManifest中包含权限：

<uses-permission android:name="android.permission.GET_TASKS" />

---

这应该行。

应用程序正在崩溃。那么Logcat在哪里？请共享你的应用程序崩溃日志。请检查Logcat..AddPostNotification的代码，我不明白你在onCreate中调用这个asyncTask，那么它在“后台”中是如何调用的？@Darpan:我应该在哪里调用asyncTask？

private void addNotification(Context context, String message) {

 int icon = R.drawable.ic_launcher;
 long when = System.currentTimeMillis();
 String appname = context.getResources().getString(R.string.app_name);
 NotificationManager notificationManager = (NotificationManager) context
 .getSystemService(Context.NOTIFICATION_SERVICE);

 Notification notification;
 PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
 new Intent(context, myactivity.class), 0);


 NotificationCompat.Builder builder = new NotificationCompat.Builder(
 context);
 notification = builder.setContentIntent(contentIntent)
 .setSmallIcon(icon).setTicker(appname).setWhen(0)
 .setAutoCancel(true).setContentTitle(appname)
 .setContentText(message).build();

 notificationManager.notify(0 , notification);

 }

<uses-permission android:name="android.permission.GET_TASKS" />