我一直在尝试使用地图和GCM等Google Play服务来编译我的项目。
在关注these instructions之后，我的项目现在成功编译并包含我需要的所有库。 Android Studio还为GCM和地图功能添加了自动完成功能。构建目标设置为Google APIs 18
但是，当我打算启动我的应用程序时，它会在碰到
时崩溃if(GooglePlayServicesUtil.isGooglePlayServicesAvailable(this) != ConnectionResult.SUCCESS){
setContentView(R.layout.error_no_play);
return;
或当它击中地图片段时
<fragment
android:id="@+id/map"
android:layout_height="match_parent"
android:layout_width="match_parent"
tools:layout="@layout/fragment_gmap"
class="com.google.android.gms.maps.MapFragment"/>
抛出的错误是：
检查GooglePlayServices是否可用时：java.lang.NoClassDefFoundError: com.google.android.gms.common.GooglePlayServicesUtil
对于片段：
.......
08-22 20:17:56.565 20356-20356/<MY_APP> E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{<MY_APP>/<MY_APP>.MainActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2178)
at android.app.ActivityThread.access$700(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1271)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5118)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at <MY_APP>.SearchFragment.newTab(SearchFragment.java:71)
at <MY_APP>.SearchFragment.setupTabs(SearchFragment.java:54)
at <MY_APP>.SearchFragment.onCreateView(SearchFragment.java:28)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:551)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
at android.app.Activity.performStart(Activity.java:5068)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2113)
... 11 more
Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.google.android.gms.maps.MapFragment: make sure class name exists, is public, and has an empty constructor that is public
at android.support.v4.app.Fragment.instantiate(Fragment.java:401)
at android.support.v4.app.Fragment.instantiate(Fragment.java:369)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
... 26 more
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.maps.MapFragment" on path: /data/app/<MY_APP>-2.apk
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
at android.support.v4.app.Fragment.instantiate(Fragment.java:391)
... 29 more
清单文件如下：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="<MyApp>"
android:versionCode="1"
android:versionName="1.0" >
<!-- Permissions required for GMap and Facebook to work -->
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<permission android:name="<MyApp>.permission.C2D_MESSAGE"
android:protectionLevel="signature" />
<uses-permission android:name="<MyApp>.permission.C2D_MESSAGE" />
<!-- Require OpenGL ES2 for GMap -->
<uses-feature android:glEsVersion="0x00020000"
android:required="true" />
<!-- Because this app is using the GCM library to send messages, the min SDK cannot be lower
than 8. Using SDK11-->
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/MyTheme" >
<receiver
android:name=".MyPushReceiver"
android:permission="com.google.android.gcm.c2dm.permission.SEND" >
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<category android:name="<MyApp>" />
</intent-filter>
</receiver>
<activity
android:name="<MyApp>.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- Facebook specific activities -->
<activity android:name="com.facebook.LoginActivity" />
<!-- GMap API key -->
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="<MY_KEY>" />
<!-- Facebook App ID -->
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id" />
</application>
</manifest>
我现在已经处理了这个问题1个月了，我仍然无法处理它。这是AndroidStudio的已知问题吗？我忘了什么吗？根据我从错误日志中读取的内容，看起来libs不是用项目编译的。
答案 0 :(得分：1)
问题解决了。
首先我加倍检查了JAVA_HOME系统env变量的设置。
设置完成后，我收到编译错误，说明已经添加了一个库：支持v4。
然后我记得我也在使用面向Android工作室的Facebook SDK，他们的build.gradle如下并且过时了：
buildscript {
repositories {
maven { url 'http://repo1.maven.org/maven2' }
}
dependencies {
classpath 'com.android.tools.build:gradle:0.4'
}
}
apply plugin: 'android-library'
dependencies {
compile files('libs/android-support-v4.jar')
}
android {
compileSdkVersion 17
buildToolsVersion "17.0.0"
defaultConfig {
minSdkVersion 7
targetSdkVersion 16
}
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
java.srcDirs = ['src']
resources.srcDirs = ['src']
res.srcDirs = ['res']
}
}
}
解决方案：现在我的脸书build.gradle如下：
buildscript {
repositories {
maven { url 'http://repo1.maven.org/maven2' }
}
dependencies {
classpath 'com.android.tools.build:gradle:0.5.+'
}
}
apply plugin: 'android-library'
dependencies {
compile 'com.android.support:support-v4:13.0.+'
}
android {
compileSdkVersion 17
buildToolsVersion "17.0.0"
defaultConfig {
minSdkVersion 7
targetSdkVersion 16
}
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
java.srcDirs = ['src']
resources.srcDirs = ['src']
res.srcDirs = ['res']
}
}
}
我只是将Gradle插件的版本替换为最近的版本，并使用更新的版本设置新的support-v4依赖项。
tl;博士：如果您正在使用适用于Android Studio的Facebook SDK，请仔细检查FacebookSDK build.gradle是否为最新版。
答案 1 :(得分：0)
可能是你的问题
3.0版本以下不支持片段。但是您使用
Use your minimumSDk version 3.0 are above 3.0
or
Use SupportMapFragment instead of MapFragment
如果您需要教程，请参阅此http://venkoolit.blogspot.in/2013/05/tutorial-for-develop-google-maps-in-api.html