Tipi incompatibili: Framment non può essere convertito in NavigationDrawerFragment

Question

Ho lavorato a un'app utilizzando l'API 14, ma ho dovuto eseguire il downgrade all'API 10. l'app ha frammenti e frammenti di attività, ho importato le librerie e utilizzato getFragmentSupportManager perché è v4. Tuttavia, ho seguente errore:

Ho creato un'applicazione fittizio con il layout cassetto e frammenti con API 10 fin dall'inizio, aveva la stessa linea in MyActivity di file e non è stato un errore. Ecco il mio codice:

package az.test2; 

import android.app.Activity; 
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.support.v7.app.ActionBarActivity; 
import android.support.v7.app.ActionBar; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.view.Gravity; 


public class MyActivity extends ActionBarActivity 
    implements NavigationDrawerFragment.NavigationDrawerCallbacks { 

    /** 
    * 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_my); 

     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 
     android.support.v4.app.FragmentManager lolo; 

     FragmentManager FM = getSupportFragmentManager(); 
     FragAV fav = new FragAV(); 
     FragW fw = new FragW(); 

     switch (position){ 
      case 0: 
       FM.beginTransaction() 
        .replace(R.id.container, fav).commit(); 
       break; 
      case 1: 
       FM.beginTransaction() 
        .replace(R.id.container, fw).commit(); 
       break; 
      case 2: break; 
     } 


     //FM.beginTransaction().replace(R.id.container, PlaceholderFragment.newInstance(position + 1)).commit(); 

    } 

    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; 
     } 
    } 

    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.my, 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(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    /** 
    * 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_my, container, false); 
      return rootView; 
     } 

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

Ho fatto tutto il possibile ma questo errore sembra essere molto raro. Qualsiasi aiuto sarebbe molto apprezzato.

Answer 1

Quando si utilizza il pacchetto di supporto, i frammenti devono estendere android.support.v4.app.Fragment e non la normale classe Fragment.

Answer 2

cambiamento questo

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

a

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

Answer 3

nella mNavigationDrawerFragment classe di importazione "android.support.v4.app.Fragment importazione;" invece di "import android.app.Fragment;"

Answer 4

assicurarsi che la classe frammento del cassetto estenda android.support.v4.app.Fragment non frammento.