无法从活动启动mapview

Question

我试图从我的代码中的mapview加载googlemaps。

当活动尝试加载时，正在生成以下错误，如下面的LogCat中所示。

我看不出任何明显的内容，我没有导入任何额外的JAR文件作为教程即时通讯使用剂量说，他们在这个简单的阶段需要。

希望一些能看到林从logcat的脚麻：

错误：

02-17 19:47:01.889: E/AndroidRuntime(300): FATAL EXCEPTION: main 
02-17 19:47:01.889: E/AndroidRuntime(300): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.mapdb/com.example.mapdb.GoogleMapsActivity}: java.lang.ClassNotFoundException: com.example.mapdb.GoogleMapsActivity in loader dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:/data/app/com.example.mapdb-2.apk] 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.os.Handler.dispatchMessage(Handler.java:99) 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.os.Looper.loop(Looper.java:123) 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.app.ActivityThread.main(ActivityThread.java:4627) 
02-17 19:47:01.889: E/AndroidRuntime(300): at java.lang.reflect.Method.invokeNative(Native Method) 
02-17 19:47:01.889: E/AndroidRuntime(300): at java.lang.reflect.Method.invoke(Method.java:521) 
02-17 19:47:01.889: E/AndroidRuntime(300): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
02-17 19:47:01.889: E/AndroidRuntime(300): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
02-17 19:47:01.889: E/AndroidRuntime(300): at dalvik.system.NativeStart.main(Native Method) 
02-17 19:47:01.889: E/AndroidRuntime(300): Caused by: java.lang.ClassNotFoundException: com.example.mapdb.GoogleMapsActivity in loader dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:/data/app/com.example.mapdb-2.apk] 
02-17 19:47:01.889: E/AndroidRuntime(300): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243) 
02-17 19:47:01.889: E/AndroidRuntime(300): at java.lang.ClassLoader.loadClass(ClassLoader.java:573) 
02-17 19:47:01.889: E/AndroidRuntime(300): at java.lang.ClassLoader.loadClass(ClassLoader.java:532) 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
02-17 19:47:01.889: E/AndroidRuntime(300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577) 
02-17 19:47:01.889: E/AndroidRuntime(300): ... 11 more 

清单：

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

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

<uses-permission android:name="android.permission.INTERNET"/> 

<application 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" > 
    <activity 
     android:name=".GoogleMapsActivity" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <uses-library android:name="com.google.android.maps" /> 
</application> 
</manifest> 

主要活动类：

package com.example.mapdb; 

import android.os.Bundle; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapView; 

public class MainActivity extends MapActivity { 

@Override 
public void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    //fetch the map view from the layout 
    MapView mapView = (MapView) findViewById(R.id.mapview); 

    //make available zoom controls 
    mapView.setBuiltInZoomControls(true); 
} 

@Override 
protected boolean isRouteDisplayed() { 

    return false; 

} 
} 

活性状况ty_main.xml布局：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" > 

    <com.google.android.maps.MapView 
    android:id="@+id/mapview" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:apiKey="0xxxxxxxxxxxxxxxxxxxxg" 
    android:clickable="true" /> 
</LinearLayout> 

Answer 1

在Java代码中，您有：

public class MainActivity extends MapActivity 

在你的清单，你必须：

<activity 
    android:name=".GoogleMapsActivity" 

MainActivity不GoogleMapsActivity。请通过重命名类或编辑清单来同步这两个值。