Android的LocationLister在IntentService实现从未执行OnLocationChanged（）方法

问题描述

我写它实现了LocationListener的接口的IntentService。该服务应发送邮件的时候OnLocationChanged（）方法被调用的第一次。但OnLocationChanged（）不会被调用。这是我的code：

公共类MyIntentService扩展IntentService实现LocationListener的{    私人诠释结果= Activity.RESULT_CANCELED;    保护使者mMessenger;    保护LocationManager mLocationManager = NULL;    公共MyIntentService（）{        超级（LocationService）;    }    @覆盖    保护无效onHandleIntent（意向意图）{        Log.i（TAG，得到了首发的意图：+ intent.toString（））;        捆绑额外= intent.getExtras（）;        如果（临时演员！= NULL）{            信使=（信使）extras.get（信使）;            如果（mLocationManager == NULL）{            mLocationManager =（LocationManager）MyIntentService.this                                    .getSystemService（Context.LOCATION_SERVICE）;            }            字符串提供商= LocationManager.GPS_PROVIDER;            布尔gpsIsEnabled = mLocationManager.isProviderEnabled（供应商）;            如果（gpsIsEnabled）{                上下文CON = MyIntentService.this;                mLocationManager.requestLocationUpdates（提供商，0，0，                                                        MyIntentService.this）;            }            其他 {                Log.i（TAG，没有GPS！）;            }        }    @覆盖    公共无效onLocationChanged（位置定位）{        Log.i（TAG，得到的位置）;        Log.i（TAG，GOT使者：+ mMessenger.toString（）                    +\ n和位置管理：+ mLocationManager.toString（））;        如果（mMessenger = NULL和放大器;！＆安培;！mLocationManager = NULL）{            结果= Activity.RESULT_OK;            消息味精= Message.obtain（）;            msg.arg1 =结果;            msg.obj =位置;            mLocationManager.removeUpdates（MyIntentService.this）;            尝试{mMessenger.send（MSG）; }            赶上（RemoteException的E）{                Log.i（TAG，捕获到异常：+ e.getMessage（））;            }        }    }    @覆盖    公共无效onProviderDisabled（字符串提供商）{}    @覆盖    公共无效onProviderEnabled（字符串提供商）{}    @覆盖    公共无效onStatusChanged（字符串商，INT地位，捆绑演员）{}}

任何人有一个想法？

解决方案

这是不是一个好主意。一个 IntentService 不应该做任何事情，生活越过 onHandleIntent（）方法。

这并不奇怪，因为该服务将被销毁一毫秒左右，在创建后，根据您的实现。

如果你的目标是有一个合理的当前位置在任何时候，试试小蓬松的位置库的。或者，考虑我的 LocationPoller 。

I've written an IntentService which implements the LocationListener interface. The service should send a message when OnLocationChanged() method was called at the first time.But OnLocationChanged() is never called.Here's my code:

public class MyIntentService extends IntentService implements LocationListener {

    private int result = Activity.RESULT_CANCELED;
    protected Messenger mMessenger;
    protected LocationManager mLocationManager = null;

    public MyIntentService() {
        super("LocationService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Log.i(TAG, "Got starting intent: " + intent.toString());
        Bundle extras = intent.getExtras();

        if (extras != null) {
            Messenger = (Messenger) extras.get("MESSENGER");

            if(mLocationManager == null) {  
            mLocationManager =  (LocationManager) MyIntentService.this
                                    .getSystemService(Context.LOCATION_SERVICE);
            }
            String provider = LocationManager.GPS_PROVIDER;
            boolean gpsIsEnabled = mLocationManager.isProviderEnabled(provider);

            if(gpsIsEnabled) {
                Context con = MyIntentService.this;
                mLocationManager.requestLocationUpdates(provider, 0, 0,
                                                        MyIntentService.this);
            } 
            else {
                Log.i(TAG, "NO GPS!");
            }
        }

    @Override
    public void onLocationChanged(Location location) {
        Log.i(TAG, "Got Location");
        Log.i(TAG, "Got Messenger: " + mMessenger.toString() 
                    + "\nand Location Manager: " + mLocationManager.toString());

        if(mMessenger != null && mLocationManager != null){
            result = Activity.RESULT_OK;
            Message msg = Message.obtain();
            msg.arg1 = result;
            msg.obj = location;
            mLocationManager.removeUpdates(MyIntentService.this);

            try { mMessenger.send(msg); } 
            catch (RemoteException e) {
                Log.i(TAG, "Exception caught : " + e.getMessage());
            }
        }
    }

    @Override
    public void onProviderDisabled(String provider) {}

    @Override
    public void onProviderEnabled(String provider) {}

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {}

}

Anyone has an idea?

解决方案

That is not a good idea. An IntentService should not do anything that lives past the onHandleIntent() method.

This is not surprising, as the service will be destroyed a millisecond or so after it is created, based upon your implementation.

If your objective is to have a reasonably current location at all times, try the Little Fluffy Location Library. Or, consider my LocationPoller.

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