Question

我正在尝试唤醒我的设备以发出网络请求。当我将闹钟设置为一两分钟时。它完美地运作。但是当我将它设置为大约10分钟并关闭我的显示器时，警报会被提升，但是凌空会引发一个＆＃34; NoConnectionError＆＃34;如标题所示。

我研究过它，我使用WakeFullBroadCastReceiver实现了我的接收器。在此之后，我遇到了同样的问题。我进一步研究并为我的wifi添加了一个锁。不过，我也遇到了同样的错误。

请提供任何帮助。

接收器：

 @Override
public void onReceive (Context context, Intent intent) {
    Log.i("Receiver", "Called here");
    Intent serIntent1 = new Intent(context, FetchTodayWordService.class);
    startWakefulService(context, serIntent1);
}

服务

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Log.i("SERVICE", "started");
    WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    lock = wifiManager.createWifiLock(WifiManager.WIFI_MODE_FULL, "LockTag");
    lock.acquire();
    MakeRequest(intent);
    return START_STICKY;
}

@Override
protected void onHandleIntent (Intent intent) {
    Log.i("OUTPUT", "Service called");
    MakeRequest(intent);
}
public void MakeRequest(final Intent intent)
{
    if (intent == null) return;
    JsonObjectRequest jsonObjectRequest =
            new JsonObjectRequest
                    (Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
                        @Override
                        public void onResponse (JSONObject response) {
                            lock.release();
                            wordDay = ParseWordDay.ParseJSON(response);
                            if(wordDay != null)
                            {
                                new StoreData().DoWork(getApplicationContext(), wordDay, intent);

                            }

                        }
                    },
                            new Response.ErrorListener() {
                                @Override
                                public void onErrorResponse (VolleyError error) {
                                    TodayWordReceiver.completeWakefulIntent(intent);
                                    lock.release();
                                    Log.i("OUTPUT", String.valueOf(error));
                                }
                            });

    MySingleton.getInstance(getApplicationContext()).addToRequestQueue(jsonObjectRequest);
}

设置闹钟：

 private void SetAlarm() {

    int alarmType = AlarmManager.ELAPSED_REALTIME;
    final int TIME = 1000 * 60 * 5;
    Intent intent = new Intent(this, TodayWordReceiver.class);

    /*boolean alarmUp = (PendingIntent.getBroadcast(getApplicationContext(),
            1, intent, PendingIntent.FLAG_NO_CREATE) != null);
    if (!alarmUp)
    {*/
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 1, intent, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarmManager.setRepeating(alarmType, SystemClock.elapsedRealtime() + TIME,
                TIME, pendingIntent);
        Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show();
    /*}else Toast.makeText(MainActivity.this, "ALarm already set", Toast.LENGTH_SHORT).show();*/
}

错误输出：

04-29 23：48：23.125 15702-15702 / com.example.clinton.light I / Receiver：在这里调用 04-29 23：48：23.145 15702-15702 / com.example.clinton.light I / SERVICE：已启动 04-29 23：48：23.175 15702-15702 / com.example.clinton.light I / OUTPUT：com.android.volley.NoConnectionError：java.net.UnknownHostException：无法解析主机＆＃34; api.wordnik.com＆＃34;：没有与主机名相关联的地址

真的很感激任何帮助。我可能无法标记你的答案，我没有足够的分数。

Answer 1

我意识到只有在屏幕打开时（当设备处于唤醒状态时）网络操作才会成功。所以我将警报类型替换为

int alarmType = AlarmManager.ELAPSED_REALTIME_WAKEUP; 而不是：

int alarmType = AlarmManager.ELAPSED_REALTIME;

并修复了它。无需对wifi进行任何锁定或使用任何睡眠线程。

所以完整的AlarmCode如下所示以供将来参考：请不要使用问题中显示的wifi锁。

private void SetAlarm() {

    int alarmType = AlarmManager.ELAPSED_REALTIME_WAKEUP;
    final int TIME = 1000 * 60 * 5;
    Intent intent = new Intent(this, TodayWordReceiver.class);

    /*boolean alarmUp = (PendingIntent.getBroadcast(getApplicationContext(),
            1, intent, PendingIntent.FLAG_NO_CREATE) != null);
    if (!alarmUp)
    {*/
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 1, intent, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarmManager.setRepeating(alarmType, SystemClock.elapsedRealtime() + TIME,
                TIME, pendingIntent);
        Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show();
    /*}else Toast.makeText(MainActivity.this, "ALarm already set", Toast.LENGTH_SHORT).show();*/
}

就是这样！

Answer 2

当代理关闭，网络连接中断或DNS问题时，UnknowHostException是一个非常通用的错误。检查进程正在运行的会话，并查看是否存在会话超时问题。

volley NoConnectionError：java.net.UnknownHostException

2 个答案: