21

我正在尝试在 Android 中使用 Service 进行一些基本的数据库操作，但由于某种原因，我得到了一个 Activity has leaked ServiceConnection 错误。我将在底部发布完整的 Logcat 读数。

我必须在多个活动中使用相同的服务，所以我创建了一个超类来处理所有的服务任务。它看起来像这样：

private MyInterface child;

public void onCreate(Bundle savedInstanceState, MyInterface child){
    super.onCreate(savedInstanceState);

    doBindService();
}

public void onResume(){
    super.onResume();

    doBindService();
}

protected void onPause(){
    super.onPause();

    doUnbindService();
}

private boolean bound;
private boolean binding;

ServiceConnection Connection = new ServiceConnection(){

    //called when the service is connected
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        Log.d(LOGTAG, "Bound to Service");
        bound = true;
        binding = false;
        toServiceMessenger = new Messenger(service);
        while(!commandsForService.isEmpty()){
            sendToService(commandsForService.poll());
        }
    }

    //called when the service is disconnected
    @Override
    public void onServiceDisconnected(ComponentName name) {
        Log.d(LOGTAG, "Unboud from Service");
        bound = false;
        binding = false;
        toServiceMessenger = null;
    }
};

private boolean doBindService(){
    Log.d(LOGTAG, "Attempting to Bind to Service");
    if(!bound && !binding){
        binding = true;
        bindService(new Intent(this, global.FetchService.class), Connection, Context.BIND_AUTO_CREATE);
    }
    return bound;
}

private void doUnbindService(){
    Log.d(LOGTAG, "Attempting to Unbind from Service");
    if(bound && !binding){
        binding = true;
        unbindService(Connection);
    }
}

public void sendToService(Message msg){
    if(bound){
        sendMessageToService(msg);
    }
    else{
        commandsForService.add(msg);
    }
}

private void sendMessageToService(Message msg){
    if(bound){
        msg.replyTo = fromServiceMessenger;
        try {
            toServiceMessenger.send(msg);
        } catch (RemoteException e) {
            Log.d(LOGTAG, "RemoteException communicating with service");
        }
    }
    else{
        Log.d(LOGTAG, "Error: toServiceMessenger null while bound");
    }
}

这个想法是子活动永远不需要担心是否连接到服务，超类应该负责获取服务数据并返回给孩子。

Logcat 在 onCreate() 中指向 doBindService() --> bindService(new Intent(this, global.FetchService.class), Connection, Context.BIND_AUTO_CREATE); 作为导致错误的行。但是，该服务仅在活动运行且可见时间超过 15 秒后才会泄漏，因此我认为不应调用 onCreate()。

这是Logcat：

09-02 09:25:40.635: E/ActivityThread(5963): Activity childActivity has leaked ServiceConnection superClass$1@42cb1b70 that was originally bound here
09-02 09:25:40.635: E/ActivityThread(5963): android.app.ServiceConnectionLeaked: Activity childActivity has leaked ServiceConnection superClass$1@42cb1b70 that was originally bound here
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:1055)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:949)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.ContextImpl.bindService(ContextImpl.java:1472)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.ContextImpl.bindService(ContextImpl.java:1464)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.content.ContextWrapper.bindService(ContextWrapper.java:394)
09-02 09:25:40.635: E/ActivityThread(5963):     at superClass.doBindService(FetchActivity.java:253)
09-02 09:25:40.635: E/ActivityThread(5963):     at superClass.onCreate(FetchActivity.java:61)
09-02 09:25:40.635: E/ActivityThread(5963):     at childActivity.onCreate(Showcase_Activity.java:37)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.Activity.performCreate(Activity.java:5066)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.ActivityThread.access$600(ActivityThread.java:151)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.os.Looper.loop(Looper.java:155)
09-02 09:25:40.635: E/ActivityThread(5963):     at android.app.ActivityThread.main(ActivityThread.java:5493)
09-02 09:25:40.635: E/ActivityThread(5963):     at java.lang.reflect.Method.invokeNative(Native Method)
09-02 09:25:40.635: E/ActivityThread(5963):     at java.lang.reflect.Method.invoke(Method.java:511)
09-02 09:25:40.635: E/ActivityThread(5963):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
09-02 09:25:40.635: E/ActivityThread(5963):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
09-02 09:25:40.635: E/ActivityThread(5963):     at dalvik.system.NativeStart.main(Native Method)

任何帮助将不胜感激。

4

5 回答 5

18

当您调用doBindService()in 时onCreate()，您应该添加 do UnbindService()in onDestroy()。

这个对我有用。

于 2014-12-20T14:05:46.613 回答
4

您doBindService()同时调用onCreate()and onResume()，尝试调用它onResume()以匹配您对doUnbindService()in的调用onPause()

于 2013-09-02T14:50:02.373 回答
2

您需要使用 Activity getActivity() 的良好参考来返回当前的，并且您需要取消绑定执行绑定的那个

这是我解决问题的方法：

private Activity mActivity;
    @Override
    public void onStart() {
        super.onStart();
        if (!mBound) {
            startService();
            mActivity = getActivity();
        }
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mBound && mActivity != null) {
            mActivity.unbindService(mServiceConnection);
            mActivity = null;
        }
    }
于 2014-05-22T03:31:36.223 回答
1

您收到此错误是因为您与活动绑定的服务在该活动被破坏时并未停止。因此，由于这个原因，您的服务仍然存在于内存中并消耗资源，这无济于事。

为了解决这个问题，doBindService()请来电onCreate()doUnbindService()onDestroy()

于 2015-09-16T06:15:04.973 回答
0

此问题仅限于Android O、API 级别 26之前的 Android SDK 。在Android O中，引入了以下启动前台服务的功能，ContextCompat.startForegroundService(...)而不是context.startService(...). 较旧的 API 不处理前台生命周期，因此需要调用context?.unbindService(serviceConnection).onDestroy(...)

startForeground(notificationId, notification)新方法确保开发人员必须在调用后的五秒内创建通知，ContextCompat.startForegroundService(...)以确保即使在应用程序不在视图中时用户也知道前台服务正在运行。

对于运行Nougat API 级别 25或更低级别的任何设备，请确保手动取消绑定服务。

IE

override fun onDestroy() {
    if (android.os.Build.VERSION.SDK_INT <= android.os.Build.VERSION_CODES.N_MR1) 
        context?.unbindService(serviceConnection)
}
于 2019-06-15T05:12:39.043 回答