无法找到明确的活动类，无法实例活动 [英] Unable to find explicit activity class and unable to instantiate activity

问题描述

即时知​​道为什么我得到一个上面的错误，当我尝试修复我的清单。我宣布我的活动我的表现是这样的：

im wondering why i get an above error, when im trying to fix my manifest. i declare my activity on my manifest like this:

<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>

和得到了我的logcat这个错误：

and got this error on my logcat:

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)

和改变我的活动我的表现是这样的：

and change my activity on my manifest like this:

 <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>

和得到这个错误在我的logcat：

and got this error in my logcat:

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

对不起，我在Android的新的。我只能理解这一点。请有人解释这一点。谢谢verymuch。

Sorry, i am new in android. i just can understand this. please someone explain this. thank you verymuch.

推荐答案

您已经声明 com.joyce.cit.DummyActivity 和logcat的说，你尝试启动 com.joyce.cit.pdfview.DummyActivity 。

You have declared com.joyce.cit.DummyActivity and logcat says you are trying to start com.joyce.cit.pdfview.DummyActivity.

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