Ошибка Android: требуется неконвертируемые типы: NavigationDrawerFragment found: Фрагмент

Question

Я новичок в android и работаю над приложением навигации и фрагмента. Я использовал

import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager;

ранее, но по некоторым причинам изменены ниже:

импорта android.app.Fragment; import android.app.FragmentManager;

Сейчас я получаю сообщение об ошибке: Ошибка: (56, 61) Ошибка: неконвертируемые типы требуется: NavigationDrawerFragment найдено: Фрагмент на строку ниже

mNavigationDrawerFragment.setUp(
      R.id.navigation_drawer, 
      (DrawerLayout) findViewById(R.id.drawer_layout)); 

Я думаю, что я изменил Fragment и FragmentManager импорт везде, не в силах понять - почему это происходит.

Любые предложения приветствуются. Заранее спасибо.

package com.androidatc.customviewindrawer; 

import android.app.Activity; 
import android.content.Intent; 
import android.net.Uri; 
import android.support.v7.app.ActionBarActivity; 
import android.support.v7.app.ActionBar; 
import android.app.Fragment; 
//import android.support.v4.app.Fragment; 
//import android.support.v4.app.FragmentManager; 
import android.app.FragmentManager; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.support.v4.widget.DrawerLayout; 
import android.widget.Toast; 


public class MainActivity extends ActionBarActivity 
     implements NavigationDrawerFragment.NavigationDrawerCallbacks, 
     SearchCatFragment.OnFragmentInteractionListener, 
     AndroidBarcodeQrExample.OnFragmentInteractionListener, 
     BarCodeFrag.OnFragmentInteractionListener, 
     MainViewFragment.OnFragmentInteractionListener { 

    /** 
    * Fragment managing the behaviors, interactions and presentation of the navigation drawer. 
    */ 
    private NavigationDrawerFragment mNavigationDrawerFragment; 

    /** 
    * Used to store the last screen title. For use in {@link #restoreActionBar()}. 
    */ 
    private CharSequence mTitle; 

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

     mNavigationDrawerFragment = (NavigationDrawerFragment) 
       getSupportFragmentManager().findFragmentById(R.id.navigation_drawer); 
     mTitle = getTitle(); 

     // Set up the drawer. 
     mNavigationDrawerFragment.setUp(
       R.id.navigation_drawer, 
       (DrawerLayout) findViewById(R.id.drawer_layout)); 
    } 

    @Override 
    public void onNavigationDrawerItemSelected(int position) { 
     // update the main content by replacing fragments 
     FragmentManager fragmentManager = getFragmentManager(); 
     fragmentManager.beginTransaction() 
       .replace(R.id.container, PlaceholderFragment.newInstance(position + 1)) 
       .commit(); 
    } 



    public void onActivityResult(int requestCode, int resultCode, Intent intent) { 
     if (requestCode == 0) { 
      if (resultCode == RESULT_OK) { 
       String contents = intent.getStringExtra("SCAN_RESULT"); 
       String format = intent.getStringExtra("SCAN_RESULT_FORMAT"); 
       Toast toast = Toast.makeText(this, "Content:" + contents + " Format:" + format, Toast.LENGTH_LONG); 
       toast.show(); 
      } 
     } 
    } 

    public void onSectionAttached(int number) { 
     switch (number) { 
      case 1: 
       mTitle = getString(R.string.title_section1); 
       break; 
      case 2: 
       mTitle = getString(R.string.title_section2); 
       break; 
      case 3: 
       mTitle = getString(R.string.title_section3); 
       break; 
      case 4: 
       mTitle = getString(R.string.title_section4); 
       break; 
      case 5: 
       mTitle = getString(R.string.title_section5); 
       break; 
     } 
    } 

    public void restoreActionBar() { 
     ActionBar actionBar = getSupportActionBar(); 
     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); 
     actionBar.setDisplayShowTitleEnabled(true); 
     actionBar.setTitle(mTitle); 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     if (!mNavigationDrawerFragment.isDrawerOpen()) { 
      // Only show items in the action bar relevant to this screen 
      // if the drawer is not showing. Otherwise, let the drawer 
      // decide what to show in the action bar. 
      getMenuInflater().inflate(R.menu.menu_main, menu); 
      restoreActionBar(); 
      return true; 
     } 
     return super.onCreateOptionsMenu(menu); 
    } 

    @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(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 



    @Override 
    public void onFragmentInteraction(Uri uri) { 

    } 

    /** 
    * A placeholder fragment containing a simple view. 
    */ 
    public static class PlaceholderFragment extends Fragment { 
     /** 
     * The fragment argument representing the section number for this 
     * fragment. 
     */ 
     private static final String ARG_SECTION_NUMBER = "section_number"; 

     /** 
     * Returns a new instance of this fragment for the given section 
     * number. 
     */ 
     public static PlaceholderFragment newInstance(int sectionNumber) { 
      PlaceholderFragment fragment = new PlaceholderFragment(); 
      Bundle args = new Bundle(); 
      args.putInt(ARG_SECTION_NUMBER, sectionNumber); 
      fragment.setArguments(args); 
      return fragment; 
     } 

     public PlaceholderFragment() { 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
           Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.fragment_main, container, false); 
      return rootView; 
     } 

     @Override 
     public void onAttach(Activity activity) { 
      super.onAttach(activity); 
      ((MainActivity) activity).onSectionAttached(
        getArguments().getInt(ARG_SECTION_NUMBER)); 
     } 
    } 

} 

Activity_main.xml

<!-- As the main content view, the view below consumes the entire 
    space available using match_parent in both dimensions. --> 
<FrameLayout android:id="@+id/container" android:layout_width="match_parent" 
    android:layout_height="match_parent" > 

    <ImageView 
     android:layout_width="match_parent" 
     android:layout_height="611dp" 
     android:id="@+id/imageView2" 
     android:layout_gravity="right|center_vertical" 
     android:background="@drawable/energybook" /> 
</FrameLayout> 

<!-- android:layout_gravity="start" tells DrawerLayout to treat 
    this as a sliding drawer on the left side for left-to-right 
    languages and on the right side for right-to-left languages. 
    If you're not building against API 17 or higher, use 
    android:layout_gravity="left" instead. --> 
<!-- The drawer is given a fixed width in dp and extends the full height of 
    the container. --> 
<fragment android:id="@+id/navigation_drawer" 
    android:layout_width="@dimen/navigation_drawer_width" android:layout_height="match_parent" 
    android:layout_gravity="start" 
    android:name="com.androidatc.customviewindrawer.NavigationDrawerFragment" 
    tools:layout="@layout/fragment_navigation_drawer" /> 

Answer 1

Ваш NavigationDrawer Фрагмент Класс должен распространяться android.support.v4.app.Fragment, а не регулярные Fragment класса

public class NavigationDrawerFragment extends android.support.v4.app.Fragment