片段导入问题与FragmentTransaction.replace搞不清

Question

这里有趣的问题。我有两个相同的Fragments和他们都import android.support.v4.app.Fragment，但是当我尝试在他们上执行FragmentTransaction.replace()编译器接受MyFrag2但在MyFrag1上给出错误。

我知道是什么造成它，但我不知道为什么。如果我将MyFrag1中的导入从android.support.v4.app.Fragment更改为android.app.Fragment，则错误消失。如果我在这两个类上导入了android.app.Fragment，则会出现错误，并且MyFrag2上出现错误。就片段的设置而言，片段类是相同的。是什么赋予了？

import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentTransaction; 

public class SettingsFragmentActivity extends FragmentActivity { 

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

     if(findViewById(R.id.fragment_container) != null) { 
      if(savedInstanceState != null) return; 

      MyFrag1 frag = new MyFrag1(); 

      android.app.FragmentTransaction transaction; 
      transaction = getFragmentManager().beginTransaction(); 



//ERROR ON THIS LINE 
//"replace (int, android.app.Fragment) to (int, MyFrag1)" 
       transaction.replace(R.id.fragment_container, frag) 


      transaction.addToBackStack(null); 
      transaction.commit(); 
     } 
    } 

    public void someOtherMethod(long id) { 
     MyFrag2 frag = new MyFrag2(); 
     Bundle args = new Bundle(); 
     args.putLong("id", id); 
     frag.setArguments(args); 

     FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); 


//NO ERROR!? The compiler happily accepts my offering. 
      transaction.replace(R.id.fragment_container, frag); 


     transaction.addToBackStack(null); 
     transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); 
     transaction.commit(); 
    } 
} 

---

MyFrag1

import android.app.Activity; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.Button; 
import android.widget.ListView; 


public class MyFrag1 extends Fragment { 
    private ListView listView; 

    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     ... 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View view = inflater.inflate(R.layout.frag1_layout, container, false); 

     ...//setup listadapter etc. 

     return view; 
    } 

    @Override 
    public void onCreate(Bundle savedState) { 
     super.onCreate(savedState); 
     //setContentView(R.layout.settings_devicelist); 
    } 

    ... 

} 

---

MyFrag2

import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.text.InputType; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.EditText; 
import android.widget.ListView; 

public class MyFrag2 extends Fragment { 
    ListView listView; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View view = inflater.inflate(R.layout.frag2_layout, container, false); 

    ...//setup listadapter etc. 

     return view; 
    } 

    @Override 
    public void onCreate(Bundle savedState) { 
     super.onCreate(savedState); 
     //setContentView(R.layout.settings_nodedmxdevice); 
    } 

    ... 

} 

Answer 1

每FragmentActivity documentation：

使用此类而不是新平台的内置碎片和加载程序支持时，必须分别使用getSupportFragmentManager()和getSupportLoaderManager()方法来访问这些功能。

所以你getFragmentManager()与getSupportFragmentManager()更换，并确保所有的进口（例如，FragmentTransaction），点到支持库版本。