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マニフェストを修正しようとしているときに、なぜ上記のエラーが発生するのか疑問に思っています。次のように、マニフェストでアクティビティを宣言します。

<activity
        android:name="com.joyce.cit.DummyActivity"
        android:label="@string/title_activity_dummy" >
        <intent-filter>
            <action android:name="android.intent.action.DUMMYACTIVITY" />

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

私のlogcatでこのエラーが発生しました：

07-19 10:08:52.290: E/AndroidRuntime(8852): FATAL EXCEPTION: main
07-19 10:08:52.290: E/AndroidRuntime(8852):   
android.content.ActivityNotFoundException:    
Unable to find explicit activity class  
{com.joyce.cit.pdfview/com.joyce.cit.pdfview.DummyActivity}; have you declared this  
activity in your AndroidManifest.xml?
07-19 10:08:52.290: E/AndroidRuntime(8852):     at 
android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1508)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at 
android.app.Instrumentation.execStartActivity(Instrumentation.java:1384)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at 
android.app.Activity.startActivityForResult(Activity.java:3190)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at   
android.app.Activity.startActivity(Activity.java:3297)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at 
com.joyce.cit.pdfview.SplashActivity$1.onClick(SplashActivity.java:30)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at  
android.view.View.performClick(View.java:3511)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at  
android.view.View$PerformClick.run(View.java:14110)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at  
android.os.Handler.handleCallback(Handler.java:605)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at 
android.os.Handler.dispatchMessage(Handler.java:92)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at 
android.os.Looper.loop(Looper.java:137)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at  
android.app.ActivityThread.main(ActivityThread.java:4424)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at   
java.lang.reflect.Method.invokeNative(Native Method)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at    
java.lang.reflect.Method.invoke(Method.java:511)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at   
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at  
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-19 10:08:52.290: E/AndroidRuntime(8852):     at 
dalvik.system.NativeStart.main(Native Method)

次のように、マニフェストのアクティビティを変更します。

 <activity
        android:name=".DummyActivity"
        android:label="@string/title_activity_dummy" >
        <intent-filter>
            <action android:name="android.intent.action.DUMMYACTIVITY" />

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

私のlogcatでこのエラーが発生しました：

07-19 10:15:31.930: E/AndroidRuntime(9038): FATAL EXCEPTION: main
07-19 10:15:31.930: E/AndroidRuntime(9038): java.lang.RuntimeException: Unable to 
instantiate activity 
ComponentInfo{com.joyce.cit.pdfview/com.joyce.cit.pdfview.DummyActivity}: 
java.lang.InstantiationException: can't instantiate class 
com.joyce.cit.pdfview.DummyActivity
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
android.app.ActivityThread.access$600(ActivityThread.java:123)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
android.os.Handler.dispatchMessage(Handler.java:99)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at  
android.os.Looper.loop(Looper.java:137)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
android.app.ActivityThread.main(ActivityThread.java:4424)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
java.lang.reflect.Method.invokeNative(Native Method)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
java.lang.reflect.Method.invoke(Method.java:511)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
dalvik.system.NativeStart.main(Native Method)
07-19 10:15:31.930: E/AndroidRuntime(9038): Caused by: 
java.lang.InstantiationException: can't instantiate class 
com.joyce.cit.pdfview.DummyActivity
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
java.lang.Class.newInstanceImpl(Native Method)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
java.lang.Class.newInstance(Class.java:1319)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
android.app.Instrumentation.newActivity(Instrumentation.java:1023)
07-19 10:15:31.930: E/AndroidRuntime(9038):     at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
07-19 10:15:31.930: E/AndroidRuntime(9038):     ... 11 more

申し訳ありませんが、私はアンドロイドが初めてです。これだけは理解できます。誰かこれを説明してください。どうもありがとうございます。

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