[英]Android ClassNotFoundException for main activity
我无法启动我的应用程序,因为它没有找到我的MainActivity,即使我具有正确的.java文件并在清单中声明了,也可以看到,如下所示:
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name="com.rakeshdas.smsblocker.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>
编辑 logcat在下面,它说找不到类MainActivity :
--------- beginning of crash
12-19 19:43:01.184 931-931/com.rakeshdas.smsblocker E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.rakeshdas.smsblocker, PID: 931
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.rakeshdas.smsblocker/com.rakeshdas.smsblocker.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.rakeshdas.smsblocker.MainActivity" on path: DexPathList[[zip file "/data/app/com.rakeshdas.smsblocker-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.rakeshdas.smsblocker.MainActivity" on path: DexPathList[[zip file "/data/app/com.rakeshdas.smsblocker-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
Suppressed: java.lang.NoClassDefFoundError: com.rakeshdas.smsblocker.MainActivity
at dalvik.system.DexFile.defineClassNative(Native Method)
at dalvik.system.DexFile.defineClass(DexFile.java:226)
at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
at dalvik.system.DexPathList.findClass(DexPathList.java:321)
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
... 14 more
Suppressed: java.lang.ClassNotFoundException: com.rakeshdas.smsblocker.MainActivity
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 13 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
这可能值得一试。
<manifest xmlns:android="http://schemas.andrwoid.com/apk/res/android"
package="com.rakeshdas.smsblocker">
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
...
否则,问题的原因可能在其他地方。
1)关闭项目
2)重新启动日食
3)打开项目
4)清洁项目
这可能会有所帮助
请检查您的xml,下面写的行是否在顶部
<?xml version="1.0" encoding="utf-8"?>
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