活動不能分配給活動

我已經閱讀過幾天的幾篇文章，我似乎無法弄清楚我的問題是什麼。我檢查了活動名稱，它們是相同的。我也檢查了我的清單，並在活動前面也有.。活動不能分配給活動

這裏是我的logcat文件：

02-23 16:48:22.438 1508-1508/com.pctoolman.planme.app E/AndroidRuntime﹕ FATAL 
     EXCEPTION: main 
     java.lang.RuntimeException: Unable to instantiate activity  
     ComponentInfo{com.pctoolman.planme.app/com.pctoolman.planme.app.PlanMeMainActivity}: 
     java.lang.ClassCastException: com.pctoolman.planme.app.PlanMeMainActivity cannot be 
     cast 
     to android.app.Activity 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
     at android.app.ActivityThread.access$600(ActivityThread.java:141) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
     at android.os.Handler.dispatchMessage(Handler.java:99) 
     at android.os.Looper.loop(Looper.java:137) 
     at android.app.ActivityThread.main(ActivityThread.java:5103) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:525) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
     at dalvik.system.NativeStart.main(Native Method) 
     Caused by: java.lang.ClassCastException: com.pctoolman.planme.app.PlanMeMainActivity 
     cannot 
     be cast to android.app.Activity 
     at android.app.Instrumentation.newActivity(Instrumentation.java:1061) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
     at android.app.ActivityThread.access$600(ActivityThread.java:141) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
     at android.os.Handler.dispatchMessage(Handler.java:99) 
     at android.os.Looper.loop(Looper.java:137) 
     at android.app.ActivityThread.main(ActivityThread.java:5103) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:525) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
     at dalvik.system.NativeStart.main(Native Method)

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.pctoolman.planme.app" > 
     <application 
       android:allowBackup="true" 
       android:icon="@drawable/ic_launcher" 
       android:label="@string/app_name" 
       android:theme="@style/AppTheme" > 
     <activity 
       android:name="com.pctoolman.planme.app.PlanMeMainActivity" 
       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.pctoolman.planme.app.NewEventSetupActivity" 
      android:label="@string/setup"> 
    </activity> 
</application>

PlanMeMainFragment.java

package com.pctoolman.planme.app; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 

public class PlanMeMainFragment extends Fragment { 

private Button mNewButton, mExistingButton; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setRetainInstance(true); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.planme_main_fragment, parent, false); 

     mNewButton = (Button)v.findViewById(R.id.new_event_button); 
     mNewButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent myIntent = new Intent(getActivity(), NewEventSetupActivity.class); 
       getActivity().startActivity(myIntent); 
      } 
     }); 
     return v; 
    } 
}

PlanMeMainActivity.java

package com.pctoolman.planme.app; 

import android.support.v4.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 

public class PlanMeMainActivity extends Fragment { 

    public Fragment createFragment() { 
     return new PlanMeMainFragment(); 
    } 

}

來源

2014-02-23 hozdaman

我們需要那個'PlanMeMainActivity'。 – chrylis

添加了PlanMeMainActivity代碼。謝謝 – hozdaman

你的「活動」實際上是一個「片段」（你擴展片段）。你需要延伸'活動' –

改變這一行

public class PlanMeMainActivity extends Fragment {

到

public class PlanMeMainActivity extends FragmentActivity {

Here你可以找到所有你需要知道的有關活動，甚至更多。乾杯

來源

2014-02-23 22:16:52

謝謝，我修好了。我會看看這個網站。謝謝你的幫助。 – hozdaman

你救了我一天@Yakiv –

你在哪裏錯了？

<activity 
      android:name="com.pctoolman.planme.app.PlanMeMainActivity" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity>

你爲什麼錯了？