为什么从警报管理器调用的服务调用 HttpUrlConnection Post 调用时给出 java.io.FileNotFoundException？

Question

详情：

在我的主要 Activity 中，我使用以下代码创建了一个警报：

Intent myIntent1 = new Intent(MainActivity.this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent1,PendingIntent.FLAG_CANCEL_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), constants.INTERVAL , pendingIntent);

然后在 AlarmReceiver 中，我使用以下代码调用服务：

  @Override
  public void onReceive(final Context context, Intent intent) {

  Intent in =  new Intent(context, LocationPoll.class);
  context.startService(in);
  }

下面是 LocationPoll.java，它扩展服务并实现位置侦听器，其中 onLocationChanged following.I 使用 GoogleApiClient 接收 updates.I 只需传递 json数据并期望 json 响应。

@Override
public void onLocationChanged(Location location) {
String url = constants.BASE_URL+constants.TRACK_URL;
JSONObject jsonBody = new JSONObject();
try {
    jsonBody.put("latitude", location.getLatitude());
    jsonBody.put("longitude",location.getLongitude());
    jsonBody.put("driver_id", constants.DRIVERID);

}
catch(Exception e ){

}
JSONRequest jr = new JSONRequest(jsonBody,url,this);
jr.execute();
}

JSONRequest Asynct 任务执行以下操作以使用 HttpUrlConnection 进行 post 调用：

URL urlConnection = new URL(url);
    System.setProperty("http.keepAlive", "false");
     connection = (HttpURLConnection) urlConnection
            .openConnection();
    connection.setDoOutput(true);
    connection.setChunkedStreamingMode(0);
    connection.setDoInput(true);
    connection.setRequestProperty("Accept", "*/*");
    connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
    connection.setRequestProperty("Accept-Encoding","gzip, deflate");
    connection.setRequestProperty("Accept-Language", "en-US,en;q=0.8,hi;q=0.6");
    connection.setRequestProperty("Connection", "close");
    connection.setRequestMethod("POST");


    OutputStream os = connection.getOutputStream();
    os.write(data.toString().getBytes("UTF-8"));
    os.close();
    connection.connect();
    _map=  connection.getHeaderFields();
    responsecode = connection.getResponseCode();

当应用程序处于前台或后台状态时，以上内容工作正常。但是当应用程序处于终止状态时，位置更新失败并出现错误：java.io.FileNotFoundException。请协助。

Logcat:

        10-14 18:50:03.806  17841-18041/? W/System.err﹕                java.io.FileNotFoundException: http://example.com
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:197)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at java.net.URLConnection$DefaultContentHandler.getContent(URLConnection.java:1017)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at java.net.URLConnection.getContent(URLConnection.java:199)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at com.bikeninja.driver_app.asynctasks.JSONRequest.doInBackground(JSONRequest.java:70)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at com.bikeninja.driver_app.asynctasks.JSONRequest.doInBackground(JSONRequest.java:23)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at android.os.AsyncTask.call(AsyncTask.java:288)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:231)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
        10-14 18:50:03.807  17841-18041/? W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
        10-14 18:50:03.809  17841-18041/? W/System.err﹕ at java.lang.Thread.run(Thread.java:818)

Answer 1

仅供参考。在我的情况下，当应用程序处于终止状态时，我传递的 JSON 数据的字段之一为空。原因是我曾经从应用程序中的常量文件中读取，当应用程序被杀死时该文件不可用。因此，用于从 server.The 获取 404 的解决方案是从 SharedPreferences 读取它。

为什么从警报管理器调用的服务调用 HttpUrlConnection Post 调用时给出 java.io.FileNotFoundException？

Why does HttpUrlConnection Post call gives java.io.FileNotFoundException when calling it from a service invoked by alarm manager?

android

post

android-service

alarmmanager

httpurlconnection