我正在编写一个包含谷歌地图 fragment 的 Android 应用程序。当我从它包含的 Activity 中排除 map fragment 时，应用程序运行正常。当我包含 map fragment 时，我得到了下面 block 引用中引用的异常。最令人恼火的是，就在几周前，这还没有发生。这个 Activity 运行了好几个星期，然后我更新了 android studio，现在我得到了这个异常。我在 google 和 stackoverflow 上的几个线程中搜索了解决方案，但没有任何效果。我什至尝试过直接复制并粘贴 map Activity 的 google android 演示，但我遇到了同样的异常。请帮忙。
引发的异常(从android监视器复制):
FATAL EXCEPTION: main Process: com.androidapps.seanmcalinden.firstandroidapp, PID: 23089 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidapps.seanmcalinden.firstandroidapp/com.androidapps.seanmcalinden.firstandroidapp.MapsActivity}: android.view.InflateException: Binary XML file line #55: Binary XML file line #55: Error inflating class fragment at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: android.view.InflateException: Binary XML file line #55: Binary XML file line #55: Error inflating class fragment at android.view.LayoutInflater.inflate(LayoutInflater.java:539) at android.view.LayoutInflater.inflate(LayoutInflater.java:423) at android.view.LayoutInflater.inflate(LayoutInflater.java:374) at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:393) at android.app.Activity.setContentView(Activity.java:2166) at com.androidapps.seanmcalinden.firstandroidapp.MapsActivity.onCreate(MapsActivity.java:67) at android.app.Activity.performCreate(Activity.java:6237) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: android.view.InflateException: Binary XML file line #55: Error inflating class fragment at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:782) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) at android.view.LayoutInflater.rInflate(LayoutInflater.java:835) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798) at android.view.LayoutInflater.inflate(LayoutInflater.java:515) at android.view.LayoutInflater.inflate(LayoutInflater.java:423) at android.view.LayoutInflater.inflate(LayoutInflater.java:374) at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:393) at android.app.Activity.setContentView(Activity.java:2166) at com.androidapps.seanmcalinden.firstandroidapp.MapsActivity.onCreate(MapsActivity.java:67) at android.app.Activity.performCreate(Activity.java:6237) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.io.File.mkdir()' on a null object reference at com.google.maps.api.android.lib6.gmm6.m.ad.a(Unknown Source) at com.google.maps.api.android.lib6.gmm6.c.h.a(Unknown Source) at com.google.maps.api.android.lib6.gmm6.c.y.a(Unknown Source) at com.google.maps.api.android.lib6.e.bd.a(Unknown Source) at com.google.maps.api.android.lib6.e.ev.a(Unknown Source) at com.google.maps.api.android.lib6.e.z.a(Unknown Source) at com.google.maps.api.android.lib6.e.y.a(Unknown Source) at com.google.android.gms.maps.internal.u.onTransact(SourceFile:107) at android.os.Binder.transact(Binder.java:387) at com.google.android.gms.maps.internal.IMapFragmentDelegate$zza$zza.onCreateView(Unknown Source) at com.google.android.gms.maps.MapFragment$zza.onCreateView(Unknown Source) at com.google.android.gms.dynamic.zza$4.zzb(Unknown Source) at com.google.android.gms.dynamic.zza.zza(Unknown Source) at com.google.android.gms.dynamic.zza.onCreateView(Unknown Source) at com.google.android.gms.maps.MapFragment.onCreateView(Unknown Source) at android.app.Fragment.performCreateView(Fragment.java:2220) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:949) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126) at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1228) at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2201) at android.app.FragmentController.onCreateView(FragmentController.java:98) at android.app.Activity.onCreateView(Activity.java:5546) at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:34) at android.support.v4.app.FragmentActivity.onCreat
OnCreate 方法:
protected void onCreate(Bundle savedInstanceState) {
Log.e("success", "entered onCreate in MapsActivity");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
MapFragment mapFragment =
(MapFragment) getFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
if (locationGAC == null) {
// ATTENTION: This "addApi(AppIndex.API)"was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
locationGAC = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(AppIndex.API).build();
Log.e("success", "created locationGAC");
}
Log.d("myTag", "test output 1");
createFriendList();
}
此 Activity 的布局文件:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="@color/colorPrimary"
android:weightSum="1" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" >
<Button
android:layout_width="70dp"
android:layout_height="60dp"
android:text="Back"
android:id="@+id/button"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_alignBottom="@+id/SearchBar1"
android:onClick="backToLogin"
android:background="@color/colorPrimaryDark"
android:textColor="#ffffff" />
<EditText
android:layout_width="0dp"
android:layout_height="60dp"
android:id="@+id/SearchBar1"
android:layout_alignParentTop="true"
android:hint="Search"
android:layout_alignParentEnd="false"
android:layout_alignParentStart="false"
android:layout_toEndOf="@id/button"
android:layout_toStartOf="@+id/SearchButton"
android:textColor="#ffffff"
android:textColorHint="#ffffff" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="70dp"
android:layout_height="60dp"
android:text="Go"
android:id="@+id/SearchButton"
android:layout_alignParentRight="true"
android:enabled="true"
android:onClick="onSearch"
android:textColor="#ffffff"
android:background="@color/colorPrimaryDark" />
</RelativeLayout>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MapsActivity"
class="com.google.android.gms.maps.MapFragment" />
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="60dp"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
<Button
android:layout_width="70dp"
android:layout_height="60dp"
android:text="Retrieve"
android:id="@+id/serverRetrieveButton"
android:layout_gravity="left"
android:textColor="#ffffff"
android:onClick="getLocationFromDexelus"
android:background="@color/colorPrimaryDark" />
<Button
android:layout_width="70dp"
android:layout_height="60dp"
android:text="Send"
android:id="@+id/serverSendButton"
android:layout_alignParentRight="true"
android:textColor="#ffffff"
android:onClick="sendLocationToDexelus"
android:background="@color/colorPrimaryDark" />
</RelativeLayout>
</RelativeLayout>
如上所述，我已经尝试了在 Stackoverflow 上找到的许多解决方案。并不是说您不应该再次发布这些内容，而是我认为我的问题可能比那些问题更复杂或更具体，因为给定的解决方案都不适合我。
谢谢。
最佳答案
出于某种原因，当我将我的 sdk 更新到周三发布的版本时，我的问题消失了。我想这是合适的，因为问题是在 android studio 更新后首次出现的。感谢您的建议!
关于安卓工作室 : Error inflating class fragment，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37288748/