Вызов спискаFragment из класса FragmentAdapter

Question

Я создаю приложение адресной книги, используя вкладки Swipe i.e «ViewPager». Я хочу вызвать ListFragment в классе FragmentAdapter. Я получаю ошибки, когда хочу вызвать класс AddressBook в классе TestFragmentAdapter. Если быть точным, ошибка указана в «new AddressBoook();». Пожалуйста, можете ли я любезно помочь мне с этим? Спасибо

Это мой класс фрагмента AddressBook.java.

package com.rufflez.viewpagerexample; 

import android.app.ListFragment; 
import android.app.LoaderManager.LoaderCallbacks; 
import android.content.ContentUris; 
import android.content.CursorLoader; 
import android.content.Loader; 
import android.database.Cursor; 
import android.net.Uri; 
import android.os.Bundle; 
import android.provider.Contacts; 
import android.provider.ContactsContract; 
import android.support.v4.widget.CursorAdapter; 
import android.support.v4.widget.SimpleCursorAdapter; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 
import android.widget.ListView; 

public class AddressBook extends ListFragment implements 
LoaderCallbacks<Cursor>{ 

private CursorAdapter mAdapter; 
public ListView listView; 
public Cursor cursor; 


public static final String[] FROM = { ContactsContract.Contacts.DISPLAY_NAME_PRIMARY, ContactsContract.Contacts.PHOTO_THUMBNAIL_URI }; 
private static final int[] TO = { R.id.text_name, R.id.contact_thumbnail }; 

int layout = R.layout.contact_list_item; 



// Name should be displayed in the text1 TextView in item layout 

private android.content.Context context; 
public View view; 
public static Uri uri; 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    // delete list if already there (old version) 
    if (!(listView == null)){ 
     listView.setAdapter(null); 
    } 

    // create adapter once 
    context = getActivity(); 
    int layout = android.R.layout.simple_list_item_1; 
    Cursor c = null; // there is no cursor yet 
    int flags = 0; // no auto-requery! Loader requeries. 

    // put List in adapter 
    mAdapter = new SimpleCursorAdapter(context, layout, c, FROM, TO, flags); 



} // end onCreate 


// columns requested from the database 
private static final String[] PROJECTION = { 
    ContactsContract.Contacts._ID, 
    ContactsContract.Contacts.PHOTO_THUMBNAIL_URI, 
    ContactsContract.Contacts.DISPLAY_NAME_PRIMARY, 
    ContactsContract.Contacts.HAS_PHONE_NUMBER, 
    ContactsContract.Contacts.IN_VISIBLE_GROUP 
}; 

// this goes in the CursorLoader parameter list, it filters 
// out only those contacts who have a phone number 
private static final String SELECTION = 
     ContactsContract.Contacts.HAS_PHONE_NUMBER + "='1'"; 

// Empty public constructor, required by the system 
public AddressBook() {} 

// A UI Fragment must inflate its View (all fragments must override onCreateView) 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    // Inflate the fragment layout 
    View view = inflater.inflate(R.layout.contact_list_view, 
      container, false); 
    listView = (ListView) view.findViewById(R.id.list); 

    // set Contact photo to ImageView 
    AddressBook frag = new AddressBook(); 
    ImageView thumb = (ImageView)view.findViewById(R.id.contact_thumbnail); 
    frag.getPhotoUriFromID(ContactsContract.Contacts._ID); 
    thumb.setImageURI(uri); 
    return view; 
} 

public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 

    // and tell loader manager to start loading 
    getLoaderManager().initLoader(0, null, this); 

    listView.setAdapter(mAdapter); 
    listView.setFastScrollEnabled(true); 

} 

// a CursorLoader does a query in the background 
@Override 
public Loader<Cursor> onCreateLoader(int id, Bundle args) { 
    // load from the "Contacts table" 
    Uri contentUri = Contacts.CONTENT_URI; 

    // no sub-selection, no sort order, simply every row 
    // projection says we want just the _id and the name column 
    return new CursorLoader(getActivity(), 
      contentUri, 
      PROJECTION, 
      SELECTION, 
      null, 
      ContactsContract.Contacts.DISPLAY_NAME 
      ); 
} 

private Uri getPhotoUriFromID(String id) { 
    try { 
     Cursor cur = context.getContentResolver() 
       .query(ContactsContract.Data.CONTENT_URI, 
         null, 
         ContactsContract.Data.CONTACT_ID 
         + "=" 
         + id 
         + " AND " 
         + ContactsContract.Data.MIMETYPE 
         + "='" 
         + ContactsContract.CommonDataKinds.Photo.CONTENT_ITEM_TYPE 
         + "'", null, null); 
     if (cur != null) { 
      if (!cur.moveToFirst()) { 
       return null; // no photo 
      } 
     } else { 
      return null; // error in cursor process 
     } 
    } catch (Exception e) { 
     e.printStackTrace(); 
     return null; 
    } 
    Uri person = ContentUris.withAppendedId(
      ContactsContract.Contacts.CONTENT_URI, Long.parseLong(id)); 
    uri = Uri.withAppendedPath(person, 
      ContactsContract.Contacts.Photo.CONTENT_DIRECTORY); 
    return uri; 
} 

@Override 
public void onLoadFinished(Loader<Cursor> loader, Cursor data) { 
    // Once cursor is loaded, give it to adapter 
    mAdapter.swapCursor(data); 
} 

@Override 
public void onLoaderReset(Loader<Cursor> loader) { 
    // Delete the reference to the existing Cursor, 
    // so it can recycle it 
    mAdapter.swapCursor(null); 
} 
} 

Это мой TestFragmentAdapter.java класс

package com.rufflez.viewpagerexample; 

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

import com.viewpagerindicator.IconPagerAdapter; 

public class TestFragmentAdapter extends FragmentPagerAdapter implements  IconPagerAdapter{ 
protected static final String[] CONTENT = new String[] { 
    "This", "Is", "A", "Test" 
}; 

private int mCount = CONTENT.length; 

public TestFragmentAdapter(FragmentManager fm) { 
    super(fm); 
} 

@Override 
public int getIconResId(int index) { 
    // TODO Auto-generated method stub 
    return 0; 
} 

@Override 
public Fragment getItem(int position) { 
    Fragment fragment = new Fragment1(); 
    switch(position){ 
    case 0: 
     fragment = new Fragment1(); 
     break; 
    case 1: 
     fragment = new AddressBook(); 
     break; 
    case 2: 
     fragment = new Fragment3(); 
     break; 
    case 3: 
     fragment = new Fragment4(); 
     break; 
    } 
    return fragment; 
} 

@Override 
public int getCount() { 
    return mCount; 
} 

@Override 
public CharSequence getPageTitle(int position){ 
    String title = ""; 
    switch(position){ 
    case 0: 
     title = "Fragment 1"; 
     break; 
    case 1: 
     title = "Fragment 2"; 
     break; 
    case 2: 
     title = "Fragment 3"; 
     break; 
    case 3: 
     title = "Fragment 4"; 
     break; 
    } 

    return title; 
} 

public void setCount(int count){ 
    if (count > 0 && count < 10){ 
     mCount = count; 
     notifyDataSetChanged(); 
    } 
} 

} 

Я получаю ошибки при вызове, когда им класс AddressBook

case 1: 
    fragment = new AddressBook(); 
break; 

пожалуйста, помогите !!!!

Answer 1

Вы можете изменить android.app.Fragment на android.support.v4.app.ListFragment в AddressBook.java. AddressBook не является подклассом android.support.v4.app.Fragment, поэтому вы получаете ошибку при выдаче типа.