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

Question

I am using Google Map V2 API for the map. I have copied the google-play-services.jar in libs folder and set in the build path of eclipse.

I am getting exception as I added logcat.

Please help to get solve this issue.

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

<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:

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

You problem is the way you added google-play-services to your project:

I have copied the google-play-services.jar in libs folder and set in the build path of eclipse.

This is wrong! Read the first 3 steps of this blog post I wrote to get an idea of how to do it correctly:

Google Maps API V2

In short, you should import google-play-services as a project in your workspace. and then reference it from your project.

this should be the result:

Answer 2

Use support Map fragment in place of Map fragment. Make sure you have added the support libray

<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"/>

Second you should not copy the jar file to your build path.

You should refer the google play services library project in your map project.

Import your library project to your worksace. import the same to eclipse.

Right click on your project. goto properties. Choose android. click android. browse and add the library project.

Answer 3

If everything is woking same as google code then please check manifest file in my case i added geo key and map key that's why exception occurs,

Note - do not add two keys in manifest file remove map key

meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="@string/google_maps_key"/>

add this code.

 <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="@string/auto_location"/>

 <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version"/>