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我有一个警报管理器，它运行intentservice每分钟从服务器获取数据然后发送通知。问题是当应用程序打开时我仍然可以获取数据但是如果应用程序关闭它会发送它抛出ECONNREFUSED。

凌空错误： 

java.util.concurrent.ExecutionException:com.android.volley.NoConnectionError:
java.net.ConnectException: failed to connect to samples.openweathermap.org/138.201.197.100 (port 443) AFTER 2500ms: isConnected failed: ECONNREFUSED (Connection refused)

测试Android 5.1.1

主要活动：

 private void scheduleAlarm() {
    Intent toastIntent= new Intent(getApplicationContext(),MyBroadcastReceiver.class);
    PendingIntent toastAlarmIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, toastIntent,PendingIntent.FLAG_UPDATE_CURRENT);
    long startTime=System.currentTimeMillis(); //alarm starts immediately
    AlarmManager backupAlarmMgr=(AlarmManager)this.getSystemService(Context.ALARM_SERVICE);
    backupAlarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP,startTime,1000*30,toastAlarmIntent); // alarm will repeat after every 15 minutes
}

广播接收器：

public class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
   MyJobIntentService.enqueueWork(context,intent);
}}

我的工作意向服务：

public class MyJobIntentService extends JobIntentService {
private String status="";

public static void enqueueWork(Context context, Intent work) {
    enqueueWork(context, MyJobIntentService.class, 1000, work);
}

@Override
protected void onHandleWork(@NonNull Intent intent) {
    RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
    String url = "http://forsitefloodapp.xyz/Func/Func_GetFloodReportsBarangay";
    RequestFuture<JSONArray> future = RequestFuture.newFuture();
    JsonArrayRequest request = new JsonArrayRequest(url,future,future);
    requestQueue.add(request);

    try {
        JSONArray response = future.get(10, java.util.concurrent.TimeUnit.SECONDS);
        int size = response.length();

        if(size==0){
            status="NO REPORTS";
        }
        else {
            status="REPORTS DETECTED";
        }

    } catch (InterruptedException e) { status="Interuppted";

    } catch (ExecutionException e) { status=e.toString();

    } catch (TimeoutException e) { status="Timeout";

    }
    Log.i("MyJobIntentService", "Completed service @ " + status);

    //Sends notification
}}
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1 回答 1

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intentservice 将不能作为后台服务（应用程序关闭）从api 21及以上..如果您只是针对api 21向前使用JobScheduler API...如果您以Api 14向前（奥利奥或奥利奥之前）为目标JobIntentService，则将其用作现代方式。您的警报管理器应该触发broadcastreceiver启动服务时间到了。服务将获取数据并为此发送通知。

于 2018-08-25T17:09:36.820 回答