这是我第一次在android中使用谷歌地图，但当我导航到显示地图的页面时，我得到了NoClassDefError。
我已经探究了这个的原因，我理解常规Java，但我似乎无法找到问题。
Google-play-services-lib作为我的项目中的库导入，因此在查找Google地图时不会失败（无论如何我都可以告诉你）。
应用程序的其余部分工作正常，只有在加载/导航到此页面时才会出现错误。
LogCat输出：
11-22 19:24:11.555: E/AndroidRuntime(1732): FATAL EXCEPTION: main
11-22 19:24:11.555: E/AndroidRuntime(1732): Process: dcs.aber.ac.uk.cs211.group02, PID: 1732
11-22 19:24:11.555: E/AndroidRuntime(1732): java.lang.NoClassDefFoundError: dcs.aber.ac.uk.cs211.group02.WalkRecording
11-22 19:24:11.555: E/AndroidRuntime(1732): at dcs.aber.ac.uk.cs211.group02.CreateWalkActivity$1.onClick(CreateWalkActivity.java:39)
11-22 19:24:11.555: E/AndroidRuntime(1732): at android.view.View.performClick(View.java:4424)
11-22 19:24:11.555: E/AndroidRuntime(1732): at android.view.View$PerformClick.run(View.java:18383)
11-22 19:24:11.555: E/AndroidRuntime(1732): at android.os.Handler.handleCallback(Handler.java:733)
11-22 19:24:11.555: E/AndroidRuntime(1732): at android.os.Handler.dispatchMessage(Handler.java:95)
11-22 19:24:11.555: E/AndroidRuntime(1732): at android.os.Looper.loop(Looper.java:137)
11-22 19:24:11.555: E/AndroidRuntime(1732): at android.app.ActivityThread.main(ActivityThread.java:4998)
11-22 19:24:11.555: E/AndroidRuntime(1732): at java.lang.reflect.Method.invokeNative(Native Method)
11-22 19:24:11.555: E/AndroidRuntime(1732): at java.lang.reflect.Method.invoke(Method.java:515)
11-22 19:24:11.555: E/AndroidRuntime(1732): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
11-22 19:24:11.555: E/AndroidRuntime(1732): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
11-22 19:24:11.555: E/AndroidRuntime(1732): at dalvik.system.NativeStart.main(Native Method)
控制台输出：
[2013-11-23 00:23:13 - WalkingTours] Android Launch!
[2013-11-23 00:23:13 - WalkingTours] adb is running normally.
[2013-11-23 00:23:13 - WalkingTours] Performing dcs.aber.ac.uk.cs211.group02.StartScreen activity launch
[2013-11-23 00:23:13 - WalkingTours] Automatic Target Mode: using existing emulator 'emulator-5556' running compatible AVD 'googleAPIDevice'
[2013-11-23 00:23:13 - WalkingTours] Uploading WalkingTours.apk onto device 'emulator-5556'
[2013-11-23 00:23:13 - WalkingTours] Installing WalkingTours.apk...
[2013-11-23 00:23:25 - WalkingTours] Success!
[2013-11-23 00:23:25 - WalkingTours] Starting activity dcs.aber.ac.uk.cs211.group02.StartScreen on device emulator-5556
[2013-11-23 00:23:29 - WalkingTours] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=dcs.aber.ac.uk.cs211.group02/.StartScreen }
的manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="dcs.aber.ac.uk.cs211.group02"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="22" />
<permission
android:name="dcs.aber.ac.uk.cs211.group02.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<!-- Accessing camera hardware -->
<!-- putting android.hardware.camera prevents non-camera devices using this app -->
<uses-feature android:name="android.hardware.camera" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<uses-permission android:name="dcs.aber.ac.uk.cs211.group02.permission.MAPS_RECEIVE" />
<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="dcs.aber.ac.uk.cs211.group02.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:logo="@drawable/ic_launcher"
android:theme="@style/AppTheme" >
<uses-library
android:name="com.google.android.maps"
android:required="true" />
<activity
android:name="dcs.aber.ac.uk.cs211.group02.StartScreen"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="dcs.aber.ac.uk.cs211.group02.CreateWalkActivity"
android:label="@string/title_activity_create_walk" >
</activity>
<activity
android:name="dcs.aber.ac.uk.cs211.group02.HelpScreen"
android:label="@string/title_activity_help_screen" >
</activity>
<activity
android:name="dcs.aber.ac.uk.cs211.group02.WalkRecording"
android:label="@string/title_activity_walk_recording" >
</activity>
<activity
android:name="dcs.aber.ac.uk.cs211.group02.CreateNewPOIActivity"
android:label="@string/title_activity_create_new_poi" >
</activity>
</application>
<meta-data
android:name="dcs.aber.ac.uk.cs211.group02.API_KEY"
android:value="AIzaSyBKYpKfU4zn-3IBkskKsLbwRsQ1-IqFldk" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</manifest>
带有错误xml（WalkRecording.xml）
的类<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/black"
tools:context=".WalkRecording" >
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:id="@+id/mapView"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
WalkRecording.java
package dcs.aber.ac.uk.cs211.group02;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
public class WalkRecording extends FragmentActivity {
private GoogleMap map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_walk_recording);
map=((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.mapView)).getMap();
map.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.walk_recording, menu);
return true;
}
}
交换到此类的代码：
public void addListenerOnButtons(){
recordButton = (Button) findViewById(R.id.createWalkButton);
recordButton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Intent intent = new Intent(context, WalkRecording.class);
startActivity(intent);
}
});
我也设置了它，因此gen文件夹位于构建顺序中的源文件夹上方。
答案 0 :(得分：0)
非常简单的解决方案。我不得不去：
项目＆gt;属性＆gt;订单和导出删除supportv4.jar clean和build，然后重新添加。
不确定为什么这是一个问题，但现在可行。
答案 1 :(得分：0)
NoClassDefFoundError的
表示在运行时未找到某些内容，但在编译时出现。也许在类路径中缺少一些库。