错误：（24,51）错误：不兼容的类型：FragmentAcitvity不能转换为片段

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我是android编程中的新手。我想在我的主要活动中添加片段时在我的ting中添加一个Facebook登录页面。错误：（24,51）错误：不兼容的类型：FragmentAcitvity不能转换为片段

这里是我的片段类

import android.app.Activity; 
import android.content.Intent; 
import android.net.Uri; 
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.TextView; 

import com.facebook.AccessToken; 
import com.facebook.CallbackManager; 
import com.facebook.FacebookCallback; 
import com.facebook.FacebookException; 
import com.facebook.FacebookSdk; 
import com.facebook.Profile; 
import com.facebook.login.LoginResult; 
import com.facebook.login.widget.LoginButton; 

public class MyFragment extends Fragment { 

private OnFragmentInteractionListener mListener; 



TextView textView; 
private CallbackManager mcallbackManager; 
private FacebookCallback<LoginResult> mCallback= new FacebookCallback<LoginResult>() { 
    @Override 
    public void onSuccess(LoginResult loginResult) { 
     AccessToken accessToken= loginResult.getAccessToken(); 
     Profile profile= Profile.getCurrentProfile(); 
     if(profile != null){ 
      textView.setText("Welcome "+ profile.getName()); 
     } 
    } 

    @Override 
    public void onCancel() { 

    } 

    @Override 
    public void onError(FacebookException e) { 

    } 
}; 

public MyFragment() { 
    // Required empty public constructor 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    FacebookSdk.sdkInitialize(getActivity().getApplicationContext()); 

    mcallbackManager=CallbackManager.Factory.create(); 
} 

@Override 
public void onViewCreated(View view, Bundle savedInstanceState) { 
    super.onViewCreated(view, savedInstanceState); 
    LoginButton loginButton=(LoginButton)view.findViewById(R.id.login_button); 
    loginButton.setReadPermissions("User_Friends"); 
    loginButton.setFragment(this); 
    loginButton.registerCallback(mcallbackManager, mCallback); 
} 

@Override 
public void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    mcallbackManager.onActivityResult(requestCode,resultCode,data); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.fragment_main, container, false); 
} 



@Override 
public void onAttach(Activity activity) { 
    super.onAttach(activity); 
    try { 
     mListener = (OnFragmentInteractionListener) activity; 
    } catch (ClassCastException e) { 
     throw new ClassCastException(activity.toString() 
       + " must implement OnFragmentInteractionListener"); 
    } 
} 

@Override 
public void onDetach() { 
    super.onDetach(); 
    mListener = null; 
} 

public interface OnFragmentInteractionListener { 
    // TODO: Update argument type and name 
    public void onFragmentInteraction(Uri uri); 
}

}

片段XML代码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="com.example.mma.androidfacebook3.MyFrgment" 

    > 


    <com.facebook.login.widget.LoginButton 
     android:id="@+id/login_button" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="center_horizontal" 
     android:layout_marginTop="30dp" 
     android:layout_marginBottom="30dp" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="New Text" 
     android:id="@+id/textView" 
     android:layout_gravity="left|top" /> 


</RelativeLayout>

MainActivity XML代码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" 
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" 
android:id="@+id/main_layout">

MainActivity类别代码

import android.app.Fragment; 
import android.app.FragmentManager; 
import android.app.FragmentTransaction; 
import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 


public class MainActivity extends ActionBarActivity { 

    Fragment. 

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

     MyFragment myfragment= new MyFragment(); 
     FragmentManager fragmentManager= getFragmentManager(); 
     FragmentTransaction fragmentTransaction= fragmentManager.beginTransaction(); 
     fragmentTransaction.add(R.id.main_layout, myfragment, "dfs"); 
     fragmentTransaction.commit(); 
    } 
}

错误 Error 错误：（24，51）错误：不兼容的类型：MyFragment不能转换到碎片

的这个应用程序的最低sdk viersion是9和maximus sdk是21. 如果有人建议我如何解决这个问题，这将非常有用。谢谢。

来源

2015-06-09 shajib0o

进口

import android.support.v4.app.Fragment

代替

import android.app.Fragment;

这是什么'Fragment.'你只是在你的活动开放的花括号后写的吗？ – Blackbelt

您需要在您的MainActivity

来源

2015-06-09 11:56:06

他已经android.support.v4.app.Fragment – Kartheek

不在MainActivity中，他没有。仔细地看。 –

这是一个未使用的导入，它需要在MyFragment类中进行更改。 – Kartheek

错误：（24,51）错误：不兼容的类型：FragmentAcitvity不能转换为片段

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