在Android中使用Google Map V2时发生ClassNotFoundException

Question

Log Cat

03-11 09:43:55.428: E/dalvikvm(1518): Could not find class 'com.google.android.gms.maps.MapFragment', referenced from method com.example.mapdemo2.MapDemo2.onCreate
03-11 09:43:55.428: W/dalvikvm(1518): VFY: unable to resolve check-cast 696 (Lcom/google/android/gms/maps/MapFragment;) in Lcom/example/mapdemo2/MapDemo2;
03-11 09:43:55.498: D/dalvikvm(1518): VFY: replacing opcode 0x1f at 0x0013
03-11 09:43:55.908: D/AndroidRuntime(1518): Shutting down VM
03-11 09:43:55.908: W/dalvikvm(1518): threadid=1: thread exiting with uncaught exception (group=0x41465700)
03-11 09:43:55.958: E/AndroidRuntime(1518): FATAL EXCEPTION: main
03-11 09:43:55.958: E/AndroidRuntime(1518): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mapdemo2/com.example.mapdemo2.MapDemo2}: android.view.InflateException: Binary XML file line #12: Error inflating class fragment
03-11 09:43:55.958: E/AndroidRuntime(1518):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at android.os.Looper.loop(Looper.java:137)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at android.app.ActivityThread.main(ActivityThread.java:5103)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at java.lang.reflect.Method.invokeNative(Native Method)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at java.lang.reflect.Method.invoke(Method.java:525)
03-11 09:43:55.958: E/AndroidRuntime(1518):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mapdemo2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="18" />

    <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.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <uses-library android:name="com.google.android.maps" >
        </uses-library>

        <activity
            android:name="com.example.mapdemo2.MapDemo2"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyAfdExXel00usxddAR-WtSJ0FMcXzSMERA" />
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" >
        </meta-data>
    </application>

</manifest>

Activity XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MapDemo2" >

    <fragment

        android:id="@+id/fragment1"
        class="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

Java Code

package com.example.mapdemo2;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.SupportMapFragment;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;

public class MapDemo2 extends FragmentActivity {

    GoogleMap maps;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map_demo2);
        SupportMapFragment mapFrag = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.fragment1));
        maps = mapFrag.getMap();
        maps.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.map_demo2, menu);
        return true;
    }

}

Answer 1

XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MapDemo2" >

<fragment

    android:id="@+id/fragment1"
    class="com.google.android.gms.maps.MapFragment"   <--- use MapFragment
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true" />

</RelativeLayout>

Java Code

    MapFragment mapFrag = ((MapFragment) getFragmentManager().findFragmentById(R.id.fragment1));
    maps = mapFrag.getMap();

Answer 2

Google introduced Google Play Services which has GoogleApiClient() to access maps and a lot of other features it support recently. I would recommend you to add a reference to the Google Play Services library project to your app project. Please see the following documentation to see how to make use of the Google Play Services using GoogleapiClient to access maps.

Please see this official documentation for code implementation.

Refer to this tutorial if you want to access Google Maps through Google Play Services.

Hope that Helps!!