我正在学习来自Android网站的教程。
但是当我运行应用程序时,它提示无法实例化活动组件
,有关ClassNotFoundException的内容。但是在manifest.xml文件中已注册MainActivity。我不知道问题出在哪里。这是完整的错误日志。
05-03 18:59:00.425: E/AndroidRuntime(20858): FATAL EXCEPTION: main
05-03 18:59:00.425: E/AndroidRuntime(20858): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.android.effectivenavigation/com.example.android.effectivenavigation.MainActivity}: java.lang.ClassNotFoundException: com.example.android.effectivenavigation.MainActivity
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.app.ActivityThread.access$600(ActivityThread.java:130)
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.os.Handler.dispatchMessage(Handler.java:99)
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.os.Looper.loop(Looper.java:137)
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.app.ActivityThread.main(ActivityThread.java:4745)
05-03 18:59:00.425: E/AndroidRuntime(20858): at java.lang.reflect.Method.invokeNative(Native Method)
05-03 18:59:00.425: E/AndroidRuntime(20858): at java.lang.reflect.Method.invoke(Method.java:511)
05-03 18:59:00.425: E/AndroidRuntime(20858): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
05-03 18:59:00.425: E/AndroidRuntime(20858): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-03 18:59:00.425: E/AndroidRuntime(20858): at dalvik.system.NativeStart.main(Native Method)
05-03 18:59:00.425: E/AndroidRuntime(20858): Caused by: java.lang.ClassNotFoundException: com.example.android.effectivenavigation.MainActivity
05-03 18:59:00.425: E/AndroidRuntime(20858): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
05-03 18:59:00.425: E/AndroidRuntime(20858): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
05-03 18:59:00.425: E/AndroidRuntime(20858): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
05-03 18:59:00.425: E/AndroidRuntime(20858): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
05-03 18:59:00.425: E/AndroidRuntime(20858): ... 11 more
清单文件,即AndroidManifest.xml
<!--
Copyright 2012 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.effectivenavigation"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="14" />
<application android:label="@string/app_name"
android:icon="@drawable/ic_launcher"
android:theme="@android:style/Theme.Holo.Light.DarkActionBar">
<activity android:name=".MainActivity" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".CollectionDemoActivity" android:label="@string/demo_collection" />
</application>
</manifest>