引起：java.lang.ClassNotFoundException：在啓動我的應用程序後沒有在路徑

Question

上找到類，模擬器告訴我，它不幸已停止。我以前有過同樣的錯誤，然後我修復了它，但添加了飛濺活動後，我又遇到了這個問題。

03-24 15:14:21.180: E/AndroidRuntime(857): FATAL EXCEPTION: main 
03-24 15:14:21.180: E/AndroidRuntime(857): Process: com.gosha.bux, PID: 857 
03-24 15:14:21.180: E/AndroidRuntime(857): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.gosha.bux/com.gosha.bux.perv}: java.lang.ClassNotFoundException: Didn't find class "com.gosha.bux.perv" on path: DexPathList[[zip file "/data/app/com.gosha.bux-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.gosha.bux-2, /system/lib]] 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121) 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.app.ActivityThread.access$800(ActivityThread.java:135) 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.os.Handler.dispatchMessage(Handler.java:102) 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.os.Looper.loop(Looper.java:136) 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.app.ActivityThread.main(ActivityThread.java:5017) 
03-24 15:14:21.180: E/AndroidRuntime(857): at java.lang.reflect.Method.invokeNative(Native Method) 
03-24 15:14:21.180: E/AndroidRuntime(857): at java.lang.reflect.Method.invoke(Method.java:515) 
03-24 15:14:21.180: E/AndroidRuntime(857): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
03-24 15:14:21.180: E/AndroidRuntime(857): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
03-24 15:14:21.180: E/AndroidRuntime(857): at dalvik.system.NativeStart.main(Native Method) 
03-24 15:14:21.180: E/AndroidRuntime(857): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.gosha.bux.perv" on path: DexPathList[[zip file "/data/app/com.gosha.bux-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.gosha.bux-2, /system/lib]] 
03-24 15:14:21.180: E/AndroidRuntime(857): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 
03-24 15:14:21.180: E/AndroidRuntime(857): at java.lang.ClassLoader.loadClass(ClassLoader.java:497) 
03-24 15:14:21.180: E/AndroidRuntime(857): at java.lang.ClassLoader.loadClass(ClassLoader.java:457) 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.app.Instrumentation.newActivity(Instrumentation.java:1061) 
03-24 15:14:21.180: E/AndroidRuntime(857): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112) 
03-24 15:14:21.180: E/AndroidRuntime(857): ... 11 more 
03-24 15:14:43.061: I/Process(857): Sending signal. PID: 857 SIG: 9 

清單

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

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="18" /> 

<application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" 
    android:debuggable="true" 
    > 
    <activity 
     android:name="com.gosha.bux.perv" 
     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="com.gosha.bux.MainActivity" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="com.gosha.bux.MAINACTIVITY" /> 

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

飛濺活動

public class perv extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(com.gosha.bux.R.layout.pervy); 
     Thread timer = new Thread(){ 
      public void run(){ 
       try{ 
        sleep(5000); 
       } 
      catch (InterruptedException e){ 
       e.printStackTrace(); 
      } 
       finally { 
        Intent openMainActivity = new Intent("com.gosha.bux.MAINACTIVITY"); 
        startActivity(openMainActivity); 
       } 
      } 

     }; 
    } 

    } 

Answer 1

只要做到這一點

Intent i = new Intent(getapplicationcontext(), 
          TARGET_Activity.class); 
        startActivity(i); 

和清單

<activity 
      android:name="com.your.packagename.TARGET_Activity" 

      android:screenOrientation="portrait" > 
     </activity> 

Answer 2

Intent openMainActivity = new Intent("com.gosha.bux.MAINACTIVITY"); 
       startActivity(openMainActivity); 

是錯誤的，而是使用：

Intent openMainActivity = new Intent(this, YourMainActivity.class); 

Answer 3

在你寫這個公共類PERV：

的setContentView（com.gosha.bux.R .layout.pervy）;

你寫pervy，而不是PERV，這將有可能導致此錯誤

Answer 4

在你要看編譯：

'com.android.support:multidex:1.0.0' 

，並設置multiDexEnabled true。

在YourApplication：在AndroidManifest聲明

@Override 
    protected void attachBaseContext(Context base) { 
     super.attachBaseContext(base); 
     MultiDex.install(this); 
    } 

最後：android:name=".MyApplication"