Android片段類型不匹配

Question

我是新來的android和我正在達特茅斯的教程。 http://www.cs.dartmouth.edu/~campbell/cs65/lecture08/lecture08.html

我下面所有的代碼，並在MainActivity.java，

// create the fragments 
Fragment mFindFragment = new FindFragment(); 
Fragment mChatFragment = new ChatFragment(); 

// bind the fragments to the tabs - set up tabListeners for each tab 
mFindTab.setTabListener(new MyTabsListener(mFindFragment, 
          getApplicationContext())); 
mChatTab.setTabListener(new MyTabsListener(mChatFragment, 
          getApplicationContext())); 

我也遇到過這樣的錯誤：類型不匹配：不能從FindFragment轉換成片段。所以我按照修正錯誤的建議，並更改代碼以

// create the fragments 
FindFragment mFindFragment = new FindFragment(); 

// bind the fragments to the tabs - set up tabListeners for each tab 
mFindTab.setTabListener(new MyTabsListener(mFindFragment, 
          getApplicationContext())); 

現在，有一個新的錯誤：構造MyTabsListener（FindFragment，上下文）是不確定的。

萬一進口是至關重要的，在這裏，他們是：

import android.app.ActionBar; 
import android.app.ActionBar.Tab; 
import android.app.Activity; 
import android.app.Fragment; 
import android.app.FragmentTransaction; 
import android.content.Context; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.widget.Toast; 

對於myTabsListener：

class MyTabsListener implements ActionBar.TabListener { 
    public Fragment fragment; 
    public Context context; 

    public MyTabsListener(Fragment fragment, Context context) { 
     this.fragment = fragment; 
     this.context = context; 

    } 

    @Override 
    public void onTabReselected(Tab tab, FragmentTransaction ft) { 
     Toast.makeText(context, "Reselected!", Toast.LENGTH_SHORT).show(); 

    } 

    @Override 
    public void onTabSelected(Tab tab, FragmentTransaction ft) { 
     Toast.makeText(context, "Selected!", Toast.LENGTH_SHORT).show(); 
     ft.replace(R.id.container, fragment); 
    } 

    @Override 
    public void onTabUnselected(Tab tab, FragmentTransaction ft) { 
     Toast.makeText(context, "Unselected!", Toast.LENGTH_SHORT).show(); 
     ft.remove(fragment); 
    } 

} 

對於我FindFragment類：

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

public class FindFragment extends Fragment { 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     return inflater.inflate(R.layout.findfragment, container, false); 
    } 


} 

我很困惑在這裏。我不確定這是否與我的導入，lib安裝或其他問題有關。提前致謝！

Answer 1

您需要更改這個

import android.support.v4.app.Fragment; 
// you will use this import when you want fragment from support library 
// in that case you will extend FragmentActivity which is the base class for support based fragments 

到

import android.app.Fragment; 

在FindFragment.java。

同樣做相同的ChatFragment.java也