bindService()之后未创建(或连接)服务

问题描述

我有这个简单的服务，可以广播用户的当前位置.我想仅使用绑定机制来控制服务生命周期，但是该服务并未启动.

I have this simple service that broadcasts the current location of the user. I want to use the binding mechanism just to control the service life-cycle, but the service is just not starting.

我做错了什么?

public class GPSActivity extends ListActivity {
...
protected void onResume() {
        super.onResume();

        Log.i("Service", "Service bound");
        Intent intent = new Intent(this, LocationService.class);
        bindService(intent, service_connection , Context.BIND_AUTO_CREATE);
    }

protected void onPause() {
        if (dataUpdateReceiver!=null)
            unregisterReceiver(dataUpdateReceiver);
        unbindService(service_connection);
        super.onPause();
    }
class LocationServiceConnection implements ServiceConnection{
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.i("Service", "Service Connected");
        }
                public void onServiceDisconnected(ComponentName name) {

        }
    }
}

LocalBinder.java

public class LocalBinder<S> extends Binder {
    private String TAG = "LocalBinder";
    private  WeakReference<S> mService;


    public LocalBinder(S service){
        mService = new WeakReference<S>(service);
    }


    public S getService() {
        return mService.get();
    }
}

LocationService.java

public class LocationService extends Service {
    public void onCreate() {
        initLocationListener();
        Log.i("Location Service","onCreate()");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("Location Service", "Received start id " + startId + ": " + intent);
        return START_NOT_STICKY;
    }

    private final IBinder mBinder = new LocalBinder<LocationService>(this);
    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }
}

AndroidManifest.xml

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    ...

    <service android:name=".LocationService">
    </service>
</application>

编辑:已修复，感谢NickT的回答.

Fixed thanks to NickT's answer.

清单条目没有意图过滤器或正确的名称

The manifest entry did not have a intent filter or the correct name

<service
   android:enabled="true"
   android:name="com.android.gps.services.LocationService">
   <intent-filter>
          <action android:name="com.android.gps.services.LocationService" />
   </intent-filter>
</service>

我用于绑定的意图就像您在开始活动时需要使用的意图.正确的是:

And the intent I used for binding was like the ones you need to use when starting an activity. the correct one is:

Intent intent = new Intent("com.android.gps.services.LocationService");

推荐答案

onStartCommand仅在显式启动服务时才会执行，看起来您只是想绑定到该服务，这很好.我看不到您已经正确设置了服务连接.我正在发布我的存根程序，该程序显示了如何绑定到服务以及如何通过活页夹调用服务中的方法.您可能希望运行此命令，并查看各种日志消息的顺序.显然，您将需要添加BroadcastReceiver和onLocationChaged代码以使其对您有用.

The onStartCommand will only execute if the service is explicitly started, it looks like you are just wanting to bind to it, which is fine. I don't see that you have set up the service connection properly though. I'm posting my stub program which shows how to bind to a service and call a method in the service through a binder. You may like to run this and see the sequence of the various log messages. You will obviously need to add your BroadcastReceiver and onLocationChaged code to make it useful for you.

活动

package com.servtest.test;

import com.servtest.test.LocationService.LocalBinder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;

public class ServiceTestActivity extends Activity {

    boolean mServiceConnected = false;
    boolean mBound = false;
    private LocationService mLocnServ;

    ServiceConnection mServconn = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.d("SVTEST", "Activity service connected");
            LocalBinder binder = (LocalBinder) service;
            mLocnServ = binder.getService();
            // Can't call this methodInTheService UNTIL IT'S BOUND!
            mLocnServ.methodInTheService();
            mBound = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.d("SVTEST", "Activity service disconnected");
            mBound = false;
        }
    };
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    @Override
    public void onStart() {
        super.onStart();
        Log.d("SVTEST", "Activity onStart");
        mServiceConnected = bindService(new Intent(
                "com.servtest.test.LOCATIONSERVICE"), mServconn,
                Context.BIND_AUTO_CREATE);
    }
    @Override
    protected void onResume() {
        super.onResume();
        Log.d("SVTEST", "Activity onResume");
    }
    @Override
    public void onPause() {
        Log.d("SVTEST", "Activity onPause");
        super.onPause();
    }
    @Override
    public void onStop() {
        Log.d("SVTEST", "Activity onStop");
        if (mBound) {
            unbindService(mServconn);
            mBound = false;
        }
        super.onStop();
    }

}

服务

package com.servtest.test;

import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;

public class LocationService extends Service implements LocationListener {

    private final IBinder mBinder = new LocalBinder();

    @Override
    public void onLocationChanged(Location arg0) {}
    @Override
    public void onProviderDisabled(String arg0) {}
    @Override
    public void onProviderEnabled(String arg0) {}
    @Override
    public void onStatusChanged(String arg0, int arg1, Bundle arg2) {}

    @Override
    public IBinder onBind(Intent intent) {
        Log.d("SVTEST", "Loc service ONBIND");
        return mBinder;
    }
    @Override
    public boolean onUnbind(Intent intent) {
        Log.d("SVTEST", "Loc service ONUNBIND");
        return super.onUnbind(intent);
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // Won't run unless it's EXPLICITLY STARTED
        Log.d("SVTEST", "Loc service ONSTARTCOMMAND");
        return super.onStartCommand(intent, flags, startId);
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d("SVTEST", "Loc service ONDESTROY");
    }

    public class LocalBinder extends Binder {
        LocationService getService() {
            // Return this instance of LocalService so clients can call public methods
            return LocationService.this;
        }
    }

    public void methodInTheService() {
        // A method you can call in the service
        Log.d("SVTEST", "Loc service EXECUTING THE METHOD");
    }
}

清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.servtest.test"
    android:versionCode="1"
    android:versionName="1.0" >
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".ServiceTestActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service
            android:enabled="true"
            android:name="LocationService">
            <intent-filter>
                <action android:name="com.servtest.test.LOCATIONSERVICE" />
            </intent-filter>
        </service>
    </application>
</manifest>

希望这会有所帮助

这篇关于bindService()之后未创建(或连接)服务的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！