Android的错误:产生的原因:抛出java.lang.ClassNotFoundException [英] Android error: Caused by: java.lang.ClassNotFoundException

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问题描述

我在Android发展非常新的,这是我的第一个应用程序。我尝试运行设备或仿真器上的应用程序,我碰到一个不幸的是,应用程序的名称已经停止。我相信错误在抛出java.lang.ClassNotFoundException开始。请能有人告诉我怎样才能解决这个问题。

这是我的清单文件

 <?XML版本=1.0编码=UTF-8&GT?;
<清单的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
  包=com.benchaful.newboard
  安卓版code =1
  机器人:=的versionName1.0><采用-SDK机器人:targetSdkVersion =17安卓的minSdkVersion =7/>
<使用许可权的android:NAME =android.permission.INTERNET对/>
<使用许可权的android:NAME =android.permission.ACCESS_NETWORK_STATE/><应用机器人:allowBackup =真正的机器人:图标=@绘制/图标机器人:标签=@字符串/ APP_NAME>
    <活动机器人:名字=com.benchaful.newBoard.MainActivity
  机器人:标签=@字符串/ APP_NAME
  机器人:screenOrientation =肖像>
        &所述;意图滤光器>
            <作用机器人:名字=android.intent.action.MAIN/>
            <类机器人:名字=android.intent.category.LAUNCHER/>
        &所述; /意图滤光器>
    < /活性GT;
    <活动机器人:名字=com.google.ads.AdActivity
          机器人:configChanges =键盘| keyboardHidden |方向/>
< /用途>< /清单>

我的主要布局文件

 <?XML版本=1.0编码=UTF-8&GT?;<的RelativeLayout的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
机器人:方向=垂直
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
><滚动型的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
机器人:ID =@ + ID / scrollview1
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
>    <的LinearLayout的android:layout_width =FILL_PARENT
     机器人:ID =@ + ID / home_layout
     机器人:方向=垂直
     机器人:layout_height =WRAP_CONTENT
     机器人:背景=#000000
     >

某些按钮此处

 <的WebView的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:ID =@ + ID / ACCESSKEY
    机器人:layout_width =FILL_PARENT
    机器人:layout_height =100px的
/>
    < / LinearLayout中>
< /滚动型>< LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
              机器人:方向=垂直
              机器人:layout_width =FILL_PARENT
              机器人:layout_height =WRAP_CONTENT
              机器人:背景=#FFFFFF
              机器人:重力=底
              机器人:layout_alignParentBottom =真
              机器人:layout_alignBottom =@ + ID / home_layout
              >
            < com.google.ads.AdView的xmlns:广告=htt​​p://schemas.android.com/apk/libs/com.google.ads
                                 机器人:ID =@ + ID / AD浏览
                                 机器人:layout_width =WRAP_CONTENT
                                 机器人:layout_height =WRAP_CONTENT
                                 广告:adUnitId设置=a151a7cc8c54403
                                 广告:adSize时=大旗
                                 />
< / LinearLayout中>
< / RelativeLayout的>

这是我的LogCat中

  17 06-07:42:40.363:E / AndroidRuntime(11994):致命异常:主要
06-07 17:42:40.363:E / AndroidRuntime(11994):了java.lang.RuntimeException:无法实例活动ComponentInfo {com.benchaful.newboard / com.benchaful.newBoard.MainActivity}:抛出java.lang.ClassNotFoundException:COM .benchaful.newBoard.MainActivity
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2045)
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2146)
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.app.ActivityThread.access $ 700(ActivityThread.java:140)
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1238)
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.os.Handler.dispatchMessage(Handler.java:99)
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.os.Looper.loop(Looper.java:137)
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.app.ActivityThread.main(ActivityThread.java:4944)
06-07 17:42:40.363:E / AndroidRuntime(11994):在java.lang.reflect.Method.invokeNative(本机方法)
06-07 17:42:40.363:E / AndroidRuntime(11994):在java.lang.reflect.Method.invoke(Method.java:511)
06-07 17:42:40.363:E / AndroidRuntime(11994):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-07 17:42:40.363:E / AndroidRuntime(11994):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-07 17:42:40.363:E / AndroidRuntime(11994):在dalvik.system.NativeStart.main(本机方法)
06-07 17:42:40.363:E / AndroidRuntime(11994):抛出java.lang.ClassNotFoundException:产生的原因com.benchaful.newBoard.MainActivity
06-07 17:42:40.363:E / AndroidRuntime(11994):在dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
06-07 17:42:40.363:E / AndroidRuntime(11994):在java.lang.ClassLoader.loadClass(ClassLoader.java:501)
06-07 17:42:40.363:E / AndroidRuntime(11994):在java.lang.ClassLoader.loadClass(ClassLoader.java:461)
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.app.Instrumentation.newActivity(Instrumentation.java:1068)
06-07 17:42:40.363:E / AndroidRuntime(11994):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2036)


解决方案
清单,主要包名为 com.benchaful.newboard

 <清单的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
  包=com.benchaful.newboard
  安卓版code =1
  机器人:=的versionName1.0>

和您的活动的声明,你有 com.benchaful.newBoard 为B大写),我认为它只是当你敲你的package.you的名称应申报你的活动语法错误像这样的:

 <活动机器人:名字=com.benchaful.newboard.MainActivity
  机器人:标签=@字符串/ APP_NAME
  机器人:screenOrientation =肖像>

 <活动机器人:名字=。MainActivity
  机器人:标签=@字符串/ APP_NAME
  机器人:screenOrientation =肖像>

I'm extremely new on Android Development, this is my first app. I try to run an app on a device or an emulator and I get "Unfortunately, app name has stopped". I believe the error begins at "java.lang.ClassNotFoundException". Please can somebody tell me 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">

<uses-sdk android:targetSdkVersion="17" android:minSdkVersion="7" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

<application android:allowBackup="true" android:icon="@drawable/icon"     android:label="@string/app_name">
    <activity android:name="com.benchaful.newBoard.MainActivity"
  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>



</manifest>

My Main layout file

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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"
     >

Some buttons here

<WebView xmlns:android="http://schemas.android.com/apk/res/android"
    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"
              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

06-07 17:42:40.363: E/AndroidRuntime(11994): FATAL EXCEPTION: main
06-07 17:42:40.363: E/AndroidRuntime(11994): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.benchaful.newboard/com.benchaful.newBoard.MainActivity}: java.lang.ClassNotFoundException: com.benchaful.newBoard.MainActivity
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2045)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2146)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.app.ActivityThread.access$700(ActivityThread.java:140)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.os.Looper.loop(Looper.java:137)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.app.ActivityThread.main(ActivityThread.java:4944)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at java.lang.reflect.Method.invokeNative(Native Method)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at java.lang.reflect.Method.invoke(Method.java:511)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at dalvik.system.NativeStart.main(Native Method)
06-07 17:42:40.363: E/AndroidRuntime(11994): Caused by: java.lang.ClassNotFoundException: com.benchaful.newBoard.MainActivity
06-07 17:42:40.363: E/AndroidRuntime(11994):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
06-07 17:42:40.363: E/AndroidRuntime(11994):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2036)

解决方案

in your manifest , the main package name is com.benchaful.newboard :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.benchaful.newboard"
  android:versionCode="1"
  android:versionName="1.0">

And on the declaration of your Activity , you have com.benchaful.newBoard ( with B uppercase) , i think that it's just a syntax error when you are tapping the name of your package.you should declare your activity like this :

<activity android:name="com.benchaful.newboard.MainActivity"
  android:label="@string/app_name"
  android:screenOrientation="portrait">

or :

<activity android:name=".MainActivity"
  android:label="@string/app_name"
  android:screenOrientation="portrait">

这篇关于Android的错误:产生的原因:抛出java.lang.ClassNotFoundException的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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