android-fragments - 片段中的 GoogleApiClient.Builder.enableAutoManage 抛出 IllegalStateException : Recursive entry to executePendingTransactions

Question

我有一个 AppCompatActivity，它有 3 个使用 FragmentTabHost 的选项卡。其中一个选项卡使用 LocationServices。我希望获得尽可能流畅的用户体验:

如果 LocationService 在 android 系统中关闭，并且 仅当 用户选择需要 Location 的选项卡我想显示 AlertDialog 让用户在系统设置中打开 Location。

我有一个助手类可以完成所有这些工作，它在我的应用程序的其他 3 个地方也能正常工作。在这 3 个地方，它在 Activity 中“直接”工作，但是在这个地方，它需要在选项卡的 Fragment“内部”工作。

问题是如果我有这条线:

builder.enableAutoManage(activity, 0, this);

然后 builder.build() 抛出异常:IllegalStateException: Recursive entry to executePendingTransactions

知道如何实现我的目标吗？

下面是一些相关的代码片段:

public class CityPreferences extends AppCompatActivity {
    private FragmentTabHost mTabHost;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
        mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
        mTabHost.addTab(
                mTabHost.newTabSpec("available_cities")
                        .setIndicator(getString(R.string.tab_all_cities))
                , AvailableCityFragment.class, null);
        mTabHost.addTab(
                mTabHost.newTabSpec("nearby_cities")
                        .setIndicator(getString(R.string.tab_nearby_cities))
                , NearbyCityFragment.class, null);
    }
}

在 NearbyCityFragment 中，我有这 1 行代码:

class NearbyCityFragment extends Fragment {
...
    LocationServiceHelper.getInstance().startOrDisplayDialog(getActivity());

(我在onAttach、onStart、onResume中试过了)

这是我的助手类的函数:

public class LocationServiceHelper implements
    GoogleApiClient.OnConnectionFailedListener,
    GoogleApiClient.ConnectionCallbacks {

public boolean startOrDisplayDialog(@NonNull final FragmentActivity activity) {
    final boolean servicesConnected = GooglePlayServicesHelper.checkOrDisplayDialog(activity);
    if (servicesConnected) {
        final boolean isEnabled = isLocationEnabledInSystem(activity);
        if (isEnabled) {
            if (null == mGoogleApiClient) {
                mContext = activity;
                mActivity = activity;
                final GoogleApiClient.Builder builder = new GoogleApiClient.Builder(mContext)
                        .addApi(LocationServices.API)
                        .addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this);

                // the next line seems to cause the problem:
                builder.enableAutoManage(activity, 0, this);

                mGoogleApiClient = builder
                        .build();
            }
            return start();
        } else {
            final Dialog dialog = getLocationDisabledDialog(activity);
            GooglePlayServicesHelper.showDialog(dialog, activity);
        }
    }
    return false;
}

最后是异常(exception):

06-10 10:23:04.831  26725-26725/com.fletech.android.redalert.debug E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.fletech.android.redalert.debug, PID: 26725
    java.lang.IllegalStateException: Recursive entry to executePendingTransactions
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1473)
            at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:490)
            at com.google.android.gms.common.api.g.a(Unknown Source)
            at com.google.android.gms.common.api.GoogleApiClient$Builder.gI(Unknown Source)
            at com.google.android.gms.common.api.GoogleApiClient$Builder.build(Unknown Source)
            at com.fletech.android.redalert.helper.LocationServiceHelper.startOrDisplayDialog(LocationServiceHelper.java:113)
            at com.fletech.android.redalert.city.NearbyCityFragment.onAttach(NearbyCityFragment.java:44)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:907)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
            at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:458)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5257)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Answer 1

我相信您每次启用自动管理器时都必须使用唯一的 clientId。来自documentation :

clientId - A non-negative identifier for this client. At any given time, only one auto-managed client is allowed per id. To reuse an id you must first call stopAutoManage(FragmentActivity) on the previous client.