造成：java.lang.ClassNotFoundException [英] caused by: java.lang.ClassNotFoundException

问题描述

这是非常令人沮丧的，当在设备或模拟器上运行该应用程序时，不幸的是，应用程序名称已停止错误。我相信（通过查看LogCat）我已经将错误定位到错误java.lang.ClassNotFoundException。我如何解决这个问题？

这是我的清单文件

  <？xml version =1.0encoding =utf-8？> 
< manifest xmlns：android =http://schemas.android.com/apk/res/android
 package =com.benchaful.newboard
 android：versionCode = 1
 android：versionName =1.0> 
 
 
<应用程序android：icon =@ drawable / iconandroid：label =@ string / app_name> 
< activity android：name =com.benchaful.newBoard.activity
 android：label =@ string / app_name
 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 =com.google.ads.AdActivity
 android：configChanges =keyboard | keyboardHidden | orientation/> 
< / application> 
< uses-sdk android：targetSdkVersion =16android：minSdkVersion =7/> 
< uses-permission android：name =android.permission.INTERNET/> 
< uses-permission android：name =android.permission.ACCESS_NETWORK_STATE/> 
 
< / manifest> 
  

这是我的主要布局文件

 <？xml version =1.0encoding =utf-8？> 
 
< RelativeLayout xmlns：android =http://schemas.android.com/apk/res/android
 xmlns：ads =http://schemas.android.com /apk/res/com.benchaful.newboard
 android：orientation =vertical
 android：layout_width =fill_parent
 android：layout_height =fill_parent
> 
 
< ScrollView xmlns：android =http://schemas.android.com/apk/res/android
 android：id =@ + id / scrollview1
 android：layout_width =fill_parent
 android：layout_height =fill_parent
> 
 
< LinearLayout android：layout_width =fill_parent
 android：id =@ + id / home_layout
 android：orientation =vertical
 android： layout_height =wrap_content
 android：background =＃000000
> 
  

这里有一些按钮

 < WebView 
 android：id =@ + id / accesskey
 android：layout_width =fill_parent
 android：layout_height =100px
 /> 
 
 
< / LinearLayout> 
< / ScrollView> 
 
< LinearLayout xmlns：android =http://schemas.android.com/apk/res/android
 xmlns：ads =http://schemas.android.com /apk/res/com.benchaful.newboard
 android：orientation =vertical
 android：layout_width =fill_parent
 android：layout_height =wrap_content
 android： background =＃ffffff
 android：gravity =bottom
 android：layout_alignParentBottom =true
 android：layout_alignBottom =@ + id / home_layout
> 
< com.google.ads.AdView 
 xmlns：ads =http://schemas.android.com/apk/libs/com.google.ads
 android：id = @ + id / adView
 android：layout_width =wrap_content
 android：layout_height =wrap_content
 ads：adUnitId =a151a7cc8c54403
 ads：adSize =BANNER 
 /> 
< / LinearLayout> 
 
 
< / RelativeLayout> 
  

这是我的LogCat

  06-06 20：03：05.355：E / AndroidRuntime（8409）：FATAL EXCEPTION：main 
 06-06 20：03：05.355：E / AndroidRuntime（8409） lang.RuntimeException：无法实例化活动ComponentInfo {com.benchaful.newboard / com.benchaful.newBoard.activity}：java.lang.ClassNotFoundException：com.benchaful.newBoard.activity 
 06-06 20：03：05.355 ：E / AndroidRuntime（8409）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2045）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在android.app.ActivityThread。 handleLaunchActivity（ActivityThread.java:2146）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：android.app.ActivityThread.access $ 700（ActivityThread.java:140）
 06- 06 20：03：05.355：E / AndroidRuntime（8409）：android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1238）
 06-06 20：03：05.355：E / AndroidRuntime（8409）在android.os.Handler.dispatchMessage（Handler.ja va：99）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在android.os.Looper.loop（Looper.java:137）
 06-06 20:03： 05.355：E / AndroidRuntime（8409）：在android.app.ActivityThread.main（ActivityThread.java:4944）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在java.lang.reflect .Method.invokeNative（Native Method）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在java.lang.reflect.Method.invoke（Method.java:511）
 06 -06 20：03：05.355：E / AndroidRuntime（8409）：at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1038）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:805）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在dalvik.system。 NativeStart.main（Native Method）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：引起的：java.lang.ClassNotFoundException：com.benchaful.newBoard.activity 
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在dalvik.system.BaseDexClassLoade r.findClass（BaseDexClassLoader.java:61）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在java.lang.ClassLoader.loadClass（ClassLoader.java:501）
 06 -06 20：03：05.355：E / AndroidRuntime（8409）：java.lang.ClassLoader.loadClass（ClassLoader.java:461）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在android.app.Instrumentation.newActivity（Instrumentation.java:1068）
 06-06 20：03：05.355：E / AndroidRuntime（8409）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2036） 
  

解决方案

在清单文件中检查你的类的名称。 / p>

将com.benchaful.newBoard.activity更改为com.benchaful.newBoard.activity.ComponentInfo

活动android： name =com.benchaful.newBoard.activity.ComponentInfo...

It is very frustrating that when running said app on a device or an emulator the "Unfortunately, app name has stopped" error came up. I believe that (by looking at the LogCat) I have pinpointed the problem to the error "java.lang.ClassNotFoundException". How I can fix this?

This is my manifest file

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


    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name="com.benchaful.newBoard.activity"
              android:label="@string/app_name"
              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="com.google.ads.AdActivity" 
          android:configChanges="keyboard|keyboardHidden|orientation" />
    </application>
    <uses-sdk android:targetSdkVersion="16" android:minSdkVersion="7" />
        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

</manifest>

This is my main layout file

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res/com.benchaful.newboard"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollview1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>

    <LinearLayout android:layout_width="fill_parent"
     android:id="@+id/home_layout"
     android:orientation="vertical"
     android:layout_height="wrap_content"
     android:background="#000000"
     >

There is some buttons here

<WebView 
    android:id="@+id/accesskey"
    android:layout_width="fill_parent"
    android:layout_height="100px"
/>


    </LinearLayout>
</ScrollView>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:ads="http://schemas.android.com/apk/res/com.benchaful.newboard"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:background="#ffffff"
              android:gravity="bottom"
              android:layout_alignParentBottom="true"
              android:layout_alignBottom="@+id/home_layout"
              >
            <com.google.ads.AdView
    xmlns:ads="http://schemas.android.com/apk/libs/com.google.ads"
                                 android:id="@+id/adView"
                                 android:layout_width="wrap_content"
                                 android:layout_height="wrap_content"
                                 ads:adUnitId="a151a7cc8c54403"
                                 ads:adSize="BANNER"
                                 />
    </LinearLayout>


    </RelativeLayout>

And this is my LogCat

06-06 20:03:05.355: E/AndroidRuntime(8409): FATAL EXCEPTION: main
06-06 20:03:05.355: E/AndroidRuntime(8409): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.benchaful.newboard/com.benchaful.newBoard.activity}: java.lang.ClassNotFoundException: com.benchaful.newBoard.activity
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2045)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2146)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.app.ActivityThread.access$700(ActivityThread.java:140)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.os.Looper.loop(Looper.java:137)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.app.ActivityThread.main(ActivityThread.java:4944)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at java.lang.reflect.Method.invokeNative(Native Method)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at java.lang.reflect.Method.invoke(Method.java:511)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at dalvik.system.NativeStart.main(Native Method)
06-06 20:03:05.355: E/AndroidRuntime(8409): Caused by: java.lang.ClassNotFoundException: com.benchaful.newBoard.activity
06-06 20:03:05.355: E/AndroidRuntime(8409):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
06-06 20:03:05.355: E/AndroidRuntime(8409):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2036)

解决方案

Check the name of your class in manifest file.

change com.benchaful.newBoard.activity to com.benchaful.newBoard.activity.ComponentInfo

activity android:name="com.benchaful.newBoard.activity.ComponentInfo"...

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