Question

我得到了这个例外：

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{business.premium/business.premium.Problemio}: 
java.lang.ClassNotFoundException: business.premium.Problemio
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
        at android.app.ActivityThread.access$600(ActivityThread.java:123)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4424)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
        at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: business.premium.Problemio
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
        ... 11 more
java.lang.ClassNotFoundException: business.premium.Problemio
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
        at android.app.ActivityThread.access$600(ActivityThread.java:123)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4424)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
        at dalvik.system.NativeStart.main(Native Method)

它说班级不在那里，但它就在那里。我尝试在项目的构建路径中配置内容，但不太确定在那里进行调整。

以下是我启动Manifest文件的方法：

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

    <supports-screens  android:largeScreens="true"   android:normalScreens="true"  android:smallScreens="true"/> 

    <uses-sdk android:minSdkVersion="4" android:targetSdkVersion="15"/>
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" 
        android:theme="@style/CustomTheme" 
        android:name="MyApplication"
        android:debuggable="true">
        <activity
            android:name=".Problemio"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

有关如何解决这个问题或者要研究什么的任何想法？谢谢！

Answer 1

这是因为您在android:name文件的应用程序节点中指定了“manifest”属性。

请勿使用android:name属性！

它误导性地与您的应用程序名称无关，实际上是在加载应用程序之前要加载的额外类的名称。这就是你获得ClassNotFoundException的原因。

删除它，它应该工作：

<application 
    android:icon="@drawable/icon" 
    android:label="@string/app_name" 
    android:description="@string/help_text" >

此答案取自：java.lang.ClassNotFoundException on working app

Android - 从另一个项目复制大量代码后启动异常启动项目

1 个答案: