Android:在bindService之后没有调用onServiceConnected

时间:2015-04-19 21:08:20

标签: android serviceconnection bindservice onserviceconnected

首先,我要说我在SO上发现了很多与此问题几乎完全相同的问题,但是没有一个(我能找到的)解决了这个问题。这些是我看过的一些内容:

ServiceConnection.onServiceConnected() never called after binding to started service onServiceConnected never called after bindService method ServiceConnection::onServiceConnected not called even though Context::bindService returns true? OnServiceConnected not getting called

以下是我的Android应用代码的一部分:

    //Local service interface
private INetworkQueryService myNetworkQueryService = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    init();
    Intent intent = new Intent(this, NetworkQueryService.class);
    startService (intent);
    bindService (new Intent(this, NetworkQueryService.class), myNetworkQueryServiceConnection,
                            Context.BIND_AUTO_CREATE);
}

//Service connection
private final ServiceConnection myNetworkQueryServiceConnection = new ServiceConnection() {
    /** Handle the task of binding the local object to the service */
    public void onServiceConnected(ComponentName className, IBinder service) {
        myNetworkQueryService = ((NetworkQueryService.LocalBinder) service).getService();
        // as soon as it is bound, run a query.
        loadNetworksList();
    }

    /** Handle the task of cleaning up the local binding */
    public void onServiceDisconnected(ComponentName className) {
        myNetworkQueryService = null;
    }

    public void loadNetworksList() {
        // delegate query request to the service.
        try {
            myNetworkQueryService.startNetworkQuery(myCallback);
        } catch (RemoteException e) {
        }
    }

};  

/**
 * This implementation of INetworkQueryServiceCallback is used to receive
 * callback notifications from the network query service.
 */
private final INetworkQueryServiceCallback myCallback = new INetworkQueryServiceCallback.Stub() {

    @Override
    public void onQueryComplete(List<NetworkInfo> networkInfoArray,
            int status) throws RemoteException {
        displayNetworks(networkInfoArray, status);
    }

    /** place the message on the looper queue upon query completion. */

};

可以sy,myNetworkQueryServiceConnection应该从bindService方法(位于onCreate())中调用。这(理论上)也应该在ServiceConnected上运行(我认为),但是我在代码中放了一个断点,它永远不会在该方法中停止。我做了一些调试,bindService返回false,所以由于某种原因,它没有成功绑定它。

这是我第一次在Android中绑定服务,所以我确定我错过了一些东西。我希望有人能指出错误。

如果您遗漏了任何信息,请告诉我们 - 我不确定您可能需要的是什么,而且我真的无法在此处发布我的整个应用代码。

编辑:我一直在阅读有关在清单中注册服务的内容,但似乎无法弄清楚在哪里或如何做?这是该项目的清单:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tek15.cellemrmonitor"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="19"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

我当然没有看到有关该服务的任何信息,但我想我不知道如何添加它。

1 个答案:

答案 0 :(得分:7)

您需要将<service>元素作为<activity>元素的对等元素添加为<application>的子元素:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tek15.cellemrmonitor"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="19"
    android:targetSdkVersion="21" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        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:name="NetworkQueryService" />
</application>

我的示例元素假设NetworkQueryService确实是com.tek15.cellemrmonitor.NetworkQueryService - 否则,请用适当的完全限定类名替换。