我是否正确使用闹钟？

Question

我有一个 Android 应用程序，它将每 x 分钟记录一次数据。闹钟响起的时间基于设置页面（10 或 30 分钟）。当警报进入启动画面时，它首先被激活。我的问题是，当我在手机上使用它时，它似乎没有被调用，所以我希望有人能告诉我我是否正确使用了该功能。

    if (prefs.getBoolean("backgroundupdates", true)) {
        Intent setAlarm = new Intent(Splash.this,
                UpdateLocation.class);
        PendingIntent pendingIntent = PendingIntent.getService(
                Splash.this, 0, setAlarm, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(
                "yyyy-MM-dd hh:mm:ssaa");
        History.addHistory(sdf.format(calendar.getTime()), "App Started", "");
        calendar.setTimeInMillis(System.currentTimeMillis());

        int UPDATE_TIME = prefs.getInt("Update_time", 30);
        calendar.add(Calendar.MINUTE, UPDATE_TIME);
        alarmManager.set(AlarmManager.RTC_WAKEUP,
                calendar.getTimeInMillis(), pendingIntent);


    }

这会检查后台更新是否开启，并

在我的 UpdateLocation.class 中设置一个 UPDATE_TIME 分钟（默认 30）的警报。我在底部有这个

    Intent setAlarm = new Intent(UpdateLocation.this,
                    UpdateLocation.class);
            PendingIntent pendingIntent = PendingIntent.getService(
                    UpdateLocation.this, 0, setAlarm, 0);
            AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(System.currentTimeMillis());
            int UPDATE_TIME = prefs.getInt("Update_time", 30);
            calendar.add(Calendar.MINUTE, UPDATE_TIME);
            alarmManager.set(AlarmManager.RTC_WAKEUP,
                    calendar.getTimeInMillis(), pendingIntent);

，这样警报将在 UPDATE_TIME 分钟内再次调用自己。我这样做的原因是因为 UPDATE_TIME 可能会改变（取决于用户偏好）

谢谢！

这里编辑是我的 UpdateLocation.class

public class UpdateLocation extends IntentService {
    public static final String id = "";

    public UpdateLocation() {
        super("UpdateLocation");
    }

    @Override
    protected void onHandleIntent(Intent intent) {

        SharedPreferences prefs = getSharedPreferences("Settings", 0);
        final String id = prefs.getString("ID", "");
        if (prefs.getBoolean("backgroundupdates", true)) {
            HttpParams httpParams = new BasicHttpParams();
            // 30seconds and it stops
            HttpConnectionParams.setConnectionTimeout(httpParams, 30000);
            HttpConnectionParams.setSoTimeout(httpParams, 30000);
            DefaultHttpClient httpclient = new DefaultHttpClient(httpParams);
            HttpPost httpost = new HttpPost(
                    "http://iphone-radar.com/gps/gps_locations");

            JSONObject holder = new JSONObject();

            try {
                holder.put("id", id);
                LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
                Criteria criteria = new Criteria();
                criteria.setAccuracy(Criteria.ACCURACY_FINE);
                String bestProvider = locationManager.getBestProvider(criteria,
                        false);
                LocationListener loc_listener = new LocationListener() {

                    @Override
                    public void onStatusChanged(String provider, int status,
                            Bundle extras) {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onProviderEnabled(String provider) {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onProviderDisabled(String provider) {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onLocationChanged(Location location) {
                        // TODO Auto-generated method stub

                    }
                };
                try {
                    Looper.prepare();
                    locationManager.requestLocationUpdates(bestProvider, 0, 0,
                            loc_listener);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                Location location = locationManager
                        .getLastKnownLocation(bestProvider);
                Calendar c = Calendar.getInstance();
                SimpleDateFormat sdf = new SimpleDateFormat(
                        "hh:mmaa MM/dd/yyyy");
                holder.put("time", sdf.format(c.getTime()));
                holder.put("time_since_epoch", System.currentTimeMillis()/1000);
                try {
                    holder.put("lat", location.getLatitude());
                    holder.put("lon", location.getLongitude());
                } catch (NullPointerException e) {
                    try {
                        holder.put("lat", -1.0);
                        holder.put("lon", -1.0);
                    } catch (JSONException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                }

                StringEntity se = new StringEntity(holder.toString());
                httpost.setEntity(se);
                httpost.setHeader("Accept", "application/json");
                httpost.setHeader("Content-type", "application/json");

                ResponseHandler responseHandler = new BasicResponseHandler();
                String response = httpclient.execute(httpost, responseHandler);
                org.json.JSONObject obj;
                SimpleDateFormat sdf2 = new SimpleDateFormat(
                        "yyyy-MM-dd hh:mm:ssaa");
                try{
                History.addHistory(sdf2.format(c.getTime()), "GPS",
                        "Latitude: " + location.getLatitude() + "\n"
                                + "Longitude: " + location.getLongitude());}
                catch(NullPointerException e){
                    History.addHistory(sdf2.format(c.getTime()), "GPS",
                            "Latitude: " + "No Signal" + "\n"
                                    + "Longitude: " + "No Signal");
                }
                obj = new org.json.JSONObject(response);
                Intent setAlarm = new Intent(UpdateLocation.this,
                        UpdateLocation.class);
                PendingIntent pendingIntent = PendingIntent.getService(
                        UpdateLocation.this, 0, setAlarm, 0);
                AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
                Calendar calendar = Calendar.getInstance();
                calendar.setTimeInMillis(System.currentTimeMillis());
                int UPDATE_TIME = prefs.getInt("Update_time", 30);
                calendar.add(Calendar.MINUTE, UPDATE_TIME);
                alarmManager.set(AlarmManager.RTC_WAKEUP,
                        calendar.getTimeInMillis(), pendingIntent);

            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    }

}

注意，我没有广播接收器，我不太确定如何使用它，所以任何示例都会非常有帮助。

Answer 1

您可以发布所有 UpdateLocation.class 吗？它需要扩展BroadcastReceiver，以便这可能是您的问题所在。

至于你的闹钟，如果它设置为每 xx 分钟响一次，没有结束，你最好使用 alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), UPDATE_TIME * 60000,endingIntent); 定期重置闹钟。

---

编辑1

关于将 PendingIntent 放入静态函数中以便于访问，它可以是这样的：

public static PendingIntent getPendingIntent(int update_time) {
    Intent setAlarm = new Intent(this.getBaseContext(), UpdateLocation.class);
    PendingIntent pendingIntent = PendingIntent.getService(this.getBaseContext(),
                                                           0, setAlarm, 0)
    return pendingIntent;
}

然后您可以使用 alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis) 设置闹钟(), UPDATE_TIME * 60000, MyClass.getPendingIntent());