使用保留的片段会导致错误膨胀 SupportMapFragment？

Question

在我从本教程 "Handling The Change" 添加 RetainedFragment 之前，我的地图一直在工作。

当使用类com.google.android.gms.maps.SupportMapFragment扩展包含片段的布局时会发生错误：

SplashScreenActivity.java 中的PlaceholderFragment

View rootView = inflater.inflate(R.layout.fragment_splash_screen, container, false);

res/layout/fragment_splash_screen.xml

<fragment
    android:id="@+id/app_search_map_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    class="com.google.android.gms.maps.SupportMapFragment" />

错误：

android.view.InflateException: Binary XML file line #18: Error inflating class fragment

完整堆栈：

03-25 10:16:51.681: I/Process(31941): Sending signal. PID: 31941 SIG: 9
03-25 10:17:00.141: E/Trace(32468): error opening trace file: No such file or directory (2)
03-25 10:17:00.381: D/AndroidRuntime(32468): Shutting down VM
03-25 10:17:00.381: W/dalvikvm(32468): threadid=1: thread exiting with uncaught exception (group=0x4184c7d0)
03-25 10:17:00.401: E/AndroidRuntime(32468): FATAL EXCEPTION: main
03-25 10:17:00.401: E/AndroidRuntime(32468): java.lang.RuntimeException: Unable to start activity ComponentInfo{br.com.ericksprengel.piz/br.com.ericksprengel.supportmapfragmentvsretainedfragment.SplashScreenActivity}: android.view.InflateException: Binary XML file line #18: Error inflating class fragment
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2115)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2153)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.app.ActivityThread.access$700(ActivityThread.java:137)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.os.Handler.dispatchMessage(Handler.java:99)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.os.Looper.loop(Looper.java:137)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.app.ActivityThread.main(ActivityThread.java:5031)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at java.lang.reflect.Method.invokeNative(Native Method)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at java.lang.reflect.Method.invoke(Method.java:511)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at dalvik.system.NativeStart.main(Native Method)
03-25 10:17:00.401: E/AndroidRuntime(32468): Caused by: android.view.InflateException: Binary XML file line #18: Error inflating class fragment
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at br.com.ericksprengel.supportmapfragmentvsretainedfragment.SplashScreenActivity$PlaceholderFragment.onCreateView(SplashScreenActivity.java:72)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.app.Activity.performStart(Activity.java:5068)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2088)
03-25 10:17:00.401: E/AndroidRuntime(32468):    ... 11 more
03-25 10:17:00.401: E/AndroidRuntime(32468): Caused by: java.lang.IllegalStateException: Fragment com.google.android.gms.maps.SupportMapFragment did not create a view.
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:314)
03-25 10:17:00.401: E/AndroidRuntime(32468):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
03-25 10:17:00.401: E/AndroidRuntime(32468):    ... 24 more

我不知道 RetainedFragment 与 SupportMapFragment 之间的关系是什么，但仅当我使用 RetainedFragment 时才会出现此错误。

// find the retained fragment on activity restarts
FragmentManager fm = getSupportFragmentManager();
dataFragment = (RetainedFragment) fm.findFragmentByTag("data");

// create the fragment and data the first time
if (dataFragment == null) {
    // add the fragment
    dataFragment = new RetainedFragment();
    fm.beginTransaction().add(dataFragment, "data").commit();
}

如果我删除此行，应用程序不会崩溃

fm.beginTransaction().add(dataFragment, "data").commit();

我创建了一个简单的项目，其中包含一个简单的 Activity，其布局简单，带有 SupportMapFragment 和 RetainedFragment。

简单项目： https://github.com/ericksprengel/support-map-fragment-vs-retained-fragment

Answer 1

我不确定这与您的 RetainedFragment 有何关系，这很奇怪。

但您的问题似乎与Having an issue with GoogleMap v2 crashing app on orientation change 有关。

您正在创建一个占位符片段，然后从 xml 加载一个子片段。看起来这样不行，只能动态添加子片段。试试看它是否能解决您的问题。