Android 服务似乎从未启动 - onStartCommand() 未调用
我正在尝试创建一个在后台处理文件 I/O 的服务。更新数据的活动将绑定到服务并调用服务的方法来执行 I/O。我使用 Android 文档作为指导。
但是，我的服务似乎不想启动。在我的 Activity 的 onCreate() 方法中，我有：
Intent smsIntent = new Intent(this, SurveyManagerService.class);
String surveyFilename = getIntent().getStringExtra("surveyFilename");
System.out.println(startService(smsIntent)); //testing if it starts
SurveyManagerServiceConnection connection = new SurveyManagerServiceConnection();
sms = connection.getSurveyManagerService();
在第 3 行 LogCat 输出一个 ComponentInfo 对象，因此看起来服务已创建；但是，短信为空。此外，SurveyManagerService onStartCommand() 方法似乎从未被调用：
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
System.out.println("starting service");
Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();
openSurveyFromIntent(intent);
return START_REDELIVER_INTENT;
}
我从未在 LogCat 中看到任何“启动服务”输出，也没有出现 Toast。
我的服务在我的清单中声明为：
<service android:name=".SurveyManagerService" android:exported="false" android:enabled="true">
</service>
我是否遗漏了一些明显的东西？让我知道我应该提供哪些其他信息来诊断问题。
I am trying to create a service that will handle file I/O in the background. Activities that update the data will bind to the service and call the service's methods to perform the I/O. I am using the Android documentation for guidance.
My service does not seem to want to start, however. In the onCreate() method of my Activity, I have:
Intent smsIntent = new Intent(this, SurveyManagerService.class);
String surveyFilename = getIntent().getStringExtra("surveyFilename");
System.out.println(startService(smsIntent)); //testing if it starts
SurveyManagerServiceConnection connection = new SurveyManagerServiceConnection();
sms = connection.getSurveyManagerService();
At line 3 LogCat outputs a ComponentInfo object, so it would appear that the service is created; however, sms is null. Furthermore, the SurveyManagerService onStartCommand() method never seems to be called:
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
System.out.println("starting service");
Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();
openSurveyFromIntent(intent);
return START_REDELIVER_INTENT;
}
I never see any "starting service" output in LogCat, nor does the Toast appear.
My service is declared in my manifest as:
<service android:name=".SurveyManagerService" android:exported="false" android:enabled="true">
</service>
Am I missing something obvious? Let me know what other information I should provide to diagnose the problem.
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请务必在 AndroidManifest.xml 中声明您的服务
Be sure to declare your service in AndroidManifest.xml
也许您不小心将服务标签放在了应用程序标签之外？然后服务就会默默地失败。虽然日志中应该有“无法启动服务意图...”错误。
Maybe you've accidentally placed the service tag outside application tag? Then the service just fails silently. Although there should be a "Unable to start service Intent..." error in the log.
看来 onCreate() 方法必须退出 在服务实际启动之前。一旦我删除了 getSurveyManagerService() 请求，并且过了一段时间，我就收到了 System.out 消息，表明服务正在启动。
不幸的是，这会产生另一个问题：活动依赖于服务来获取其数据，因此我需要确定如何使活动等待服务启动。
编辑：我的解决方案是在我的 Activity 中创建 ServiceConnection 的私有子类。然后，我重写 onServiceConnected() 方法以向 Activity 提供其数据（在本例中填充 ListView）。
It seems the onCreate() method has to exit before the service can actually start. Once I removed the getSurveyManagerService() request, and once a bit of time had passed, I received the System.out messages indicating the service was starting.
Unfortunately that creates another problem: the Activity relies on the Service for its data, so I need to determine how to cause the Activity to wait for the service to start.
EDIT: My solution was to create a private subclass of my ServiceConnection in my Activity. I then overrode the onServiceConnected() method to provide the Activity with its data (populating a ListView, in this case).
就我而言，我重构了服务类和服务类。注意到它没有在清单中自动重构。所以我必须手动更新清单中服务的完全限定名称。
In my case i refactored the service class & noticed that it was not automatically refactored in manifest. So i had to manually update the fully qualified name of the service in manifest.