android服务和活动生命周期？

gorgi93 发表于 Dev

戈尔吉93

我的android IntentService出现问题。当我第一次打开应用程序时，该服务会从配置文件活动中按意图启动，并且将从该服务中获取数据。如果我切换到其他活动，然后返回服务仍在运行，那就可以了。

但是，如果按回去，以便活动结束并置于后台，则该服务仍在工作，因为该应用程序在后台，但是如果我将其返回到前台，则该服务将停止。我不知道为什么。波纹管是我的代码，请帮忙。

我已经阅读了几次活动生命周期，但仍然不明白为什么会这样。

奇怪的是，当MainActivity返回运行状态时，Service在停止之前再接收数据一次。服务没有崩溃。

服务

public class SomeService extends IntentService
{
    public static final String extra = "someData";

    public SomeService()
    {
        super(SomeService.class.getSimpleName());
    }

    @Override
    protected void onHandleIntent(Intent intent)
    {
        Log.e("SomeService", "starting service");

        while (true)
        {
            SomeData data = Api.getNewSocketData();

            //Broadcast data when received to update the view
            Intent broadcastData = new Intent();
            broadcastData.setAction(dataBroadcastReceiver.ACTION_DATA_RECEIVED);
            broadcastData.addCategory(Intent.CATEGORY_DEFAULT);
            broadcastData.putExtra(extra, " ");
            sendBroadcast(broadcastData);

            Log.e("SomeService", "received from socket");
        }

    }


}

接收者

public class dataBroadcastReceiver extends BroadcastReceiver
{
    public final static String ACTION_DATA_RECEIVED = "net.bitstamp.intent.action.ACTION_SOMEDATA_RECEIVED";

    @Override
    public void onReceive(Context context, Intent intent)
    {

        Log.e("receiver", "data received");
    }
}

主要活动

@Override
public void onPause()
{
    super.onPause();

    unregisterReceiver(dataBroadcastReceiver);
}

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

    IntentFilter intentFilter = new IntentFilter(dataBroadcastReceiver.ACTION_DATA_RECEIVED);
    intentFilter.addCategory(Intent.CATEGORY_DEFAULT);
    dataBroadcastReceiver = new dataBroadcastReceiver();
    registerReceiver(dataBroadcastReceiver, intentFilter);

    Intent someService = new Intent(this, SomeService.class);
    startService(someService);

}