無法啓動活動ComponentInfo {... MainActivity}：java.lang.NullPointerException

Question

我想構建一個使用HoloEverywhere的應用程序。按照此manual中的說明導入HoloEverywhere和ActionBarSherlock。

MainActivity：

import org.holoeverywhere.app.*; 
import android.os.Bundle; 

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 
} 

的AndroidManifest.xml：

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

    <uses-sdk 
     android:minSdkVersion="9" 
     android:targetSdkVersion="17" /> 

    <application android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/Holo.Theme" 
     android:allowBackup="true"> 
     <activity 
      android:name="com.myapp.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> 
    </application> 

</manifest> 

org.holoeverywhere.addon.IAddonBasicAttacher.inhert：

public void inhert(Collection<Class<? extends IAddon>> sourceClasses) { 
    List<Class<? extends IAddon>> classes = new ArrayList<Class<? extends IAddon>>(); 
    for (Class<? extends IAddon> clazz : sourceClasses) { 
     if (!clazz.isAnnotationPresent(Addon.class)) { 
      continue; 
     } 
     Addon addon = clazz.getAnnotation(Addon.class); 
     if (addon.inhert()) { 
      classes.add(clazz); 
     } 
    } 
    addon(classes); 
} 

public void inhert(IAddonAttacher<?> attacher) { 
    inhert(attacher.obtainAddonsList()); 
} 

當我想運行的應用程序，因爲我得到了在eclipse以下錯誤：

 05-15 23:26:48.132: E/AndroidRuntime(16934): FATAL EXCEPTION: main 
05-15 23:26:48.132: E/AndroidRuntime(16934): 
java.lang.RuntimeException: Unable to start activity 
ComponentInfo{com.myapp/com.myapp.MainActivity}: 
java.lang.NullPointerException 05-15 23:26:48.132: 
E/AndroidRuntime(16934): at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
05-15 23:26:48.132: E/AndroidRuntime(16934): at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
05-15 23:26:48.132: E/AndroidRuntime(16934): at 
android.app.ActivityThread.access$600(ActivityThread.java:130) 05-15 
23:26:48.132: E/AndroidRuntime(16934):  at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
05-15 23:26:48.132: E/AndroidRuntime(16934): at 
android.os.Handler.dispatchMessage(Handler.java:99) 05-15 
23:26:48.132: E/AndroidRuntime(16934):  at 
android.os.Looper.loop(Looper.java:137) 05-15 23:26:48.132: 
E/AndroidRuntime(16934): at 
android.app.ActivityThread.main(ActivityThread.java:4745) 05-15 
23:26:48.132: E/AndroidRuntime(16934):  at 
java.lang.reflect.Method.invokeNative(Native Method) 05-15 
23:26:48.132: E/AndroidRuntime(16934):  at 
java.lang.reflect.Method.invoke(Method.java:511) 05-15 23:26:48.132: 
E/AndroidRuntime(16934): at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
05-15 23:26:48.132: E/AndroidRuntime(16934): at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 05-15 
23:26:48.132: E/AndroidRuntime(16934):  at 
dalvik.system.NativeStart.main(Native Method) 05-15 23:26:48.132: 
E/AndroidRuntime(16934): Caused by: java.lang.NullPointerException 
05-15 23:26:48.132: E/AndroidRuntime(16934): at 
org.holoeverywhere.addon.IAddonBasicAttacher.inhert(IAddonBasicAttacher.java:89) 
05-15 23:26:48.132: E/AndroidRuntime(16934): at 
org.holoeverywhere.app.Activity.onCreate(Activity.java:247) 05-15 
23:26:48.132: E/AndroidRuntime(16934):  at 
com.myapp.MainActivity.onCreate(MainActivity.java:10) 05-15 
23:26:48.132: E/AndroidRuntime(16934):  at 
android.app.Activity.performCreate(Activity.java:5008) 05-15 
23:26:48.132: E/AndroidRuntime(16934):  at 
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
05-15 23:26:48.132: E/AndroidRuntime(16934): at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
05-15 23:26:48.132: E/AndroidRuntime(16934): ... 11 more 

什麼問題？

Answer 1

好吧，抱歉，那是在HoloEverywhere的錯誤。

https://github.com/Prototik/HoloEverywhere/issues/447

Answer 2

Chnage在menifest活動啓動軟件包名稱是根包

<application android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/Holo.Theme" 
     android:allowBackup="true"> 
     <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> 
    </application>