android – 当应用程序进程终止时,SyncAdapter进程被终止

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从应用程序切换器列表中刷出应用程序时,为什么SyncAdapter进程(：sync)被终止？我认为这里的全部意图是让他们脱钩.

编辑：

以下是使用的代码. mUploadTask是一个执行的AsyncTask,它从sqlite表中读取信息(使用getContext().getContentResolver())并将相关数据上传到后端(使用HttpPost).很直接.

此外,我只实现了一个onSyncCanceled(),因为我的SyncAdapter不支持并行同步多个帐户.

public class SyncAdapter extends AbstractThreadedSyncAdapter implements UploadTaskListener {

private static final String TAG = SyncAdapter.class.getSimpleName();

private static volatile UploadTask mUploadTask;

/**
 * Set up the sync adapter
 */
public SyncAdapter(Context context, boolean autoInitialize) {
    super(context, autoInitialize);
}

/**
 * Set up the sync adapter. This form of the
 * constructor maintains compatibility with Android 3.0
 * and later platform versions
 */
public SyncAdapter(
        Context context,
        boolean autoInitialize,
        boolean allowParallelSyncs) {
    super(context, autoInitialize, allowParallelSyncs);
}

@Override
public void onPerformSync(Account account, Bundle extras, String authority,
        ContentProviderClient provider, SyncResult syncResult) {

    MHLog.logI(TAG, "onPerformSync");

    ContentResolver.setSyncAutomatically(account, authority, true);

    if (mUploadTask == null) {
        synchronized (SyncAdapter.class) {
            if (mUploadTask == null) {
                mUploadTask = new UploadTask(getContext(), this).executeOnSettingsExecutor();
                MHLog.logI(TAG, "onPerformSync - running");
            }
        }
    }
}

@Override
public void onSyncCanceled() {
    MHLog.logI(TAG, "onSyncCanceled");
    if(mUploadTask != null){
        mUploadTask.cancel(true);
        mUploadTask = null;
    }
}

解决方法:

从文档：

Syncs can be cancelled at any time by the framework. For example a sync that was not user-initiated and lasts longer than 30 minutes will be considered timed-out and cancelled. Similarly the framework will attempt to determine whether or not an adapter is making progress by monitoring its network activity over the course of a minute. If the network traffic over this window is close enough to zero the sync will be cancelled. You can also request the sync be cancelled via cancelSync(Account, String) or cancelSync(SyncRequest).

A sync is cancelled by issuing a interrupt() on the syncing thread. Either your code in onPerformSync(Account, Bundle, String, ContentProviderClient, SyncResult) must check interrupted(), or you you must override one of onSyncCanceled(Thread)/onSyncCanceled() (depending on whether or not your adapter supports syncing of multiple accounts in parallel). If your adapter does not respect the cancel issued by the framework you run the risk of your app’s entire process being killed.

您是否确保遵守SyncAdapter框架的规则？

此外,很高兴看到您的一些代码深入了解框架取消同步的原因…

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