android谷歌地圖java.lang.RuntimeException：無法實例化活動ComponentInfo

Question

我想在我的應用程序上顯示谷歌地圖，我使用谷歌地圖V2，我做了所有步驟，但我仍然有這些錯誤，該應用程序是墜毀，機上推出... 這個logcat的：

07-21 11:24:02.808: E/AndroidRuntime(592): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.testmap/com.example.testmap.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.testmap.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.testmap-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.testmap-2, /system/lib]] 
07-21 11:38:26.698: E/AndroidRuntime(673): FATAL EXCEPTION: main 
07-21 11:38:26.698: E/AndroidRuntime(673): Process: com.example.testmap, PID: 673 
07-21 11:38:26.698: E/AndroidRuntime(673): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.testmap/com.example.testmap.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.testmap.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.testmap-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.testmap-1, /system/lib]] 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2134) 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2270) 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.app.ActivityThread.access$800(ActivityThread.java:138) 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209) 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.os.Handler.dispatchMessage(Handler.java:102) 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.os.Looper.loop(Looper.java:136) 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.app.ActivityThread.main(ActivityThread.java:5042) 
07-21 11:38:26.698: E/AndroidRuntime(673): at java.lang.reflect.Method.invokeNative(Native Method) 
07-21 11:38:26.698: E/AndroidRuntime(673): at java.lang.reflect.Method.invoke(Method.java:515) 
07-21 11:38:26.698: E/AndroidRuntime(673): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:776) 
07-21 11:38:26.698: E/AndroidRuntime(673): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
07-21 11:38:26.698: E/AndroidRuntime(673): at dalvik.system.NativeStart.main(Native Method) 
07-21 11:38:26.698: E/AndroidRuntime(673): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.testmap.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.testmap-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.testmap-1, /system/lib]] 
07-21 11:38:26.698: E/AndroidRuntime(673): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 
07-21 11:38:26.698: E/AndroidRuntime(673): at java.lang.ClassLoader.loadClass(ClassLoader.java:497) 
07-21 11:38:26.698: E/AndroidRuntime(673): at java.lang.ClassLoader.loadClass(ClassLoader.java:457) 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.app.Instrumentation.newActivity(Instrumentation.java:1061) 
07-21 11:38:26.698: E/AndroidRuntime(673): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2125) 
07-21 11:38:26.698: E/AndroidRuntime(673): ... 11 more 

Mainctivity.java

package com.example.testmap; 

import android.app.Activity; 
import android.os.Bundle; 

public class MainActivity extends Activity { 

    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 

}

activitymain.xml：

<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: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="com.example.testmap.MainActivity" > 

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


</RelativeLayout> 

清單文件：

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

    <uses-sdk 
     android:minSdkVersion="12" 
     android:targetSdkVersion="18" /> 
<permission android:name="com.example.testmap.MAPS_RECEIVE" android:protectionLevel="signature"/> 
<uses-permission android:name="com.example.testmap.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"/> 
<!-- The following two permissions are not required to use 
    Google Maps Android API v2, but are recommended. --> 
<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_GSERVICE"/> 

    <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" > 
     <activity 
      android:name=".MainActivity" 
      android:label="@string/app_name" > 
      <meta-data 
    android:name="com.google.android.gms.version" 
    android:value="@integer/google_play_services_version" /> 
      <meta-data 
    android:name="com.google.android.maps.v2.API_KEY" 
    android:value="my key "/> 


      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

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

</manifest> 

Answer 1

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