错误java.lang.ClassNotFoundException:Google Map V2中的com.google.android.gms.maps.MapFragment

Question

我正在使用Google Map V2 API来制作地图.我已经在libs文件夹中复制了google-play-services.jar,并在eclipse的构建路径中进行了设置.

因为我添加了logcat,我得到了异常.

请帮忙解决这个问题.

home_map_view.xml

<fragment
      android:id="@+id/map"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:name="com.google.android.gms.maps.MapFragment"
      android:layout_marginBottom="60dp"/>

AndroidManifest.xml中

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.app"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" />

    <permission
        android:name="com.example.app.permission.MAPS_RECEIVE"
        android:protectionLevel="signature"/>

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

    <uses-permission android:name="com.example.app.permission.MAPS_RECEIVE"/>

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>

    <application android:icon="@drawable/ic_launcher" android:label="@string/app_name">

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="KEY"/>

       <activity android:name=".MainActivity" android:label="@string/app_name" android:clearTaskOnLaunch="true" 
           android:configChanges="orientation" android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".HomeMapView" android:label="@string/title_home" android:configChanges="orientation" android:launchMode="singleTop" />
    </application>
</manifest>

HomeMapView.java

public class HomeMapView extends FragmentActivity implements OnTabChangeListener {

    private GoogleMap mapView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home_map_view);

        // Getting reference to SupportMapFragment of the activity_main
        SupportMapFragment fragment = new SupportMapFragment(); 
        getSupportFragmentManager().beginTransaction() .add(R.id.map, fragment).commit(); 

        // Getting Map for the SupportMapFragment
        mapView = fragment.getMap();
        mapView.setMyLocationEnabled(true);
    }
}

logcat的:

05-15 23:17:52.843: E/AndroidRuntime(19782): FATAL EXCEPTION: main
05-15 23:17:52.843: E/AndroidRuntime(19782): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.app/com.example.app.HomeMapView}: android.view.InflateException: Binary XML file line #13: Error inflating class fragment
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.os.Looper.loop(Looper.java:130)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.app.ActivityThread.main(ActivityThread.java:3687)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at java.lang.reflect.Method.invokeNative(Native Method)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at java.lang.reflect.Method.invoke(Method.java:507)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at dalvik.system.NativeStart.main(Native Method)
05-15 23:17:52.843: E/AndroidRuntime(19782): Caused by: android.view.InflateException: Binary XML file line #13: Error inflating class fragment
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:587)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:216)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.app.Activity.setContentView(Activity.java:1660)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at com.example.app.HomeMapView.onCreate(HomeMapView.java:61)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
05-15 23:17:52.843: E/AndroidRuntime(19782):    ... 11 more
05-15 23:17:52.843: E/AndroidRuntime(19782): Caused by: android.support.v4.app.Fragment$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
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.support.v4.app.Fragment.instantiate(Fragment.java:395)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.support.v4.app.Fragment.instantiate(Fragment.java:363)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:264)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
05-15 23:17:52.843: E/AndroidRuntime(19782):    ... 20 more
05-15 23:17:52.843: E/AndroidRuntime(19782): Caused by: java.lang.ClassNotFoundException: com.google.android.gms.maps.MapFragment in loader dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:/data/app/com.example.app-2.apk]
05-15 23:17:52.843: E/AndroidRuntime(19782):    at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
05-15 23:17:52.843: E/AndroidRuntime(19782):    at android.support.v4.app.Fragment.instantiate(Fragment.java:385)
05-15 23:17:52.843: E/AndroidRuntime(19782):    ... 23 more

Answer 1

您遇到的问题是您添加google-play-services到项目中的方式:

我已经在libs文件夹中复制了google-play-services.jar,并在eclipse的构建路径中进行了设置.

这是错的!阅读我写的这篇博客文章的前三个步骤,以了解如何正确地做到这一点:

Google Maps API V2

简而言之,您应该google-play-services在工作区中导入项目.然后从您的项目中引用它.

这应该是结果:

Answer 2

使用支持Map片段代替Map片段.确保已添加支持库

<fragment
  android:id="@+id/map"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:name="com.google.android.gms.maps.SupportMapFragment "
  android:layout_marginBottom="60dp"/>

其次,您不应该将jar文件复制到构建路径.

您应该在地图项目中引用Google Play服务库项目.

将您的库项目导入您的工作区.导入相同的eclipse.

右键单击您的项目.转到属性.选择android.点击android.浏览并添加库项目.