Android：无法替换碎片，在替换方法中出现错误

我正在开发具有导航抽屉和碎片的应用程序，但似乎无法解决一个错误。Android：无法替换碎片，在替换方法中出现错误

我在FragmentTransaction方法replace(int,Fragment)中出错。它显示类型FragmentTransaction中的方法replace(int, Fragment)不适用于参数(int, MyFragment)。

MyFragment是一个自定义片段。

import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBar; 
import android.support.v7.app.ActionBarActivity; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
@SuppressWarnings("deprecation") 
public class MainActivity extends ActionBarActivity implements OnItemClickListener { 

    private DrawerLayout drawerlayout; 
    private ListView listview; 
    private String[] planets; 
    private ActionBarDrawerToggle drawerlistener; 
    private ActionBar actionBar;  
    private FragmentTransaction fragmenttransaction; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     drawerlayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
     listview = (ListView) findViewById(R.id.list); 
     planets = getResources().getStringArray(R.array.planets); 
     listview.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 
     listview.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_activated_1, planets)); 
     listview.setOnItemClickListener(this); 
     drawerlistener = new ActionBarDrawerToggle(this, drawerlayout, R.drawable.ic_drawer, R.string.drawer_open); 

     drawerlayout.setDrawerListener(drawerlistener); 
     actionBar = getSupportActionBar(); 
     actionBar.setHomeButtonEnabled(true); 
     //getSupportActionBar().setDisplayShowHomeEnabled(true); 
     actionBar.setDisplayHomeAsUpEnabled(true); 

     FragmentManager fragmentmanager = getSupportFragmentManager(); 
     fragmenttransaction = fragmentmanager.beginTransaction(); 
     loadSelection(0); 
    } 

    private void loadSelection(int i) { 
     // TODO Auto-generated method stub 
     listview.setItemChecked(i, true); 
     if(i==1) 
     { 
      MyFragment fragment1 = new MyFragment(); 
      fragmenttransaction.replace(R.id.main, fragment1); 
      fragmenttransaction.commit(); 
     } 
    } 

    @Override 
    protected void onPostCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onPostCreate(savedInstanceState); 
     drawerlistener.syncState(); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     if (drawerlistener.onOptionsItemSelected(item)) { 
       return true; 
      } 

     return super.onOptionsItemSelected(item); 
    } 

    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
     // TODO Auto-generated method stub 

     switch (position) { 
     case 0: 

      break; 

     case 1: 

      break; 

     case 3: 

      break; 
     default: 
      break; 
     } 
     drawerlayout.closeDrawer(listview); 
    } 
}

而且MyFragment.java是在这里：

package com.example.test3; 
import android.app.Activity; 
import android.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 

public class MyFragment extends Fragment 
{ 
    public MyFragment(){ 

    } 
    @SuppressWarnings({ "deprecation" }) 
    @Override 
    public void onAttach(Activity activity) { 
     // TODO Auto-generated method stub 
     super.onAttach(activity); 
    } 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
    } 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     //return super.onCreateView(inflater, container, savedInstanceState); 
     return inflater.inflate(R.layout.fragment1, container, false); 
    } 
    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onActivityCreated(savedInstanceState); 
    } 
    @Override 
    public void onDestroy() { 
     // TODO Auto-generated method stub 
     super.onDestroy(); 
    } 
}

来源

2015-12-29 Sudhanshu Singh

尝试用片段myFragment =新MyFragment（） –

你定制的片断应该支持V4库扩展Fragment。

import android.support.v4.app.Fragment，而不是import android.app.Fragment

来源

2015-12-29 10:25:26 dgngulcan

我读过你的答案，这是件好事，但*应扩展导入*没有任何意义，所以我决定编辑你的答案，所以现在很明白要理解。 –

谢谢先生......它一直在窃听我2个小时。 –

在MyFragment类

import android.support.v4.app.Fragment

，而不是

import android.app.Fragment

来源

2015-12-29 10:31:15

谢谢，先生。 –

Android：无法替换碎片，在替换方法中出现错误

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