kann nicht findViewById() in CustomListView mit Fragmenten

Question

Ich entwerfe eine UI, wo meine App 3 Registerkarten hat und ich habe es mit Fragmenten erstellt und ich dritte Registerkarte Ich brauche ListView mit Text und Bildern anzuzeigen.Ich kann die anzeigen Liste, aber wenn ich auf Zuhörer zu jedem Artikel schrieb die App zum Absturz starten und jetzt habe ich einen Fehler in nicht findViewById() function.I'll meinen Code mit diesem teilen .please mir hepl aus Contact.java

import java.util.ArrayList; 
import java.util.List; 

import android.content.Intent; 
import android.content.res.TypedArray; 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.ListFragment; 
import android.support.v7.app.AppCompatActivity; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ListView; 
import com.tutorialsbuzz.slidetablistview.R; 

public class Contact extends ListFragment implements AdapterView.OnItemClickListener {   

String[] member_names; 
TypedArray profile_pics; 
String[] statues; 
String[] contactType; 
List<RowItem> rowItems; 
ListView mylistview; 

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

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

    rowItems = new ArrayList<RowItem>(); 

    member_names = getResources().getStringArray(R.array.Member_names); 
    profile_pics = getResources().obtainTypedArray(R.array.profile_pics); 
    statues = getResources().getStringArray(R.array.statues); 
    contactType = getResources().getStringArray(R.array.contactType); 

    for (int i = 0; i < member_names.length; i++) { 
     RowItem item = new RowItem(member_names[i], 
       profile_pics.getResourceId(i, -1), statues[i], 
       contactType[i]); 
     rowItems.add(item); 
    } 
    mylistview= (ListView) findViewById(android.R.id.list); 
    CustomAdapter adapter = new CustomAdapter(getActivity(), rowItems); 
    setListAdapter(adapter); 
    profile_pics.recycle(); 
    mylistview.setOnItemClickListener(this); 

} 



@Override 
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
    super.onCreateOptionsMenu(menu, inflater); 
    getActivity().getMenuInflater().inflate(R.menu.menu_main, menu); 
} 

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

} 

@Override 
public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
    if (position == 0) { 
     Intent myIntent = new Intent(view.getContext(), ummy.class); 
     startActivityForResult(myIntent, 0); 
    } 

    if (position == 1) { 
     Intent myIntent = new Intent(view.getContext(),ummy.class); 
     startActivityForResult(myIntent, 0); 
    } 



    if (position == 2) { 
     Intent myIntent = new Intent(view.getContext(), ummy.class); 
     startActivityForResult(myIntent, 0); 
    } 

    if (position == 3) { 
     Intent myIntent = new Intent(view.getContext(), ummy.class); 
     startActivityForResult(myIntent, 0); 
    } 

    if (position == 4) { 
     Intent myIntent = new Intent(view.getContext(), ummy.class); 
     startActivityForResult(myIntent, 0); 
    } 

} 
} 

CustomAdapter.java

Contact.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout  `xmlns:android="http://schemas.android.com/apk/res/android"` 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical" 
android:background="#ffffff" > 

<ListView 
    android:id="@android:id/list" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" > 
</ListView> 

<TextView 
    android:id="@android:id/empty" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" > 
</TextView> 

</LinearLayout> 

Answer 1

Verwenden getView() Ihre Ansicht zu holen. Diese Methode gibt die Stammansicht für das Fragment zurück. Mit diesem können Sie findViewById() anrufen. Oder gehen Sie wie folgt

ListView mylistview; 

@Override 
public View onCreateView(LayoutInflater inflater, 
     ViewGroup container, Bundle savedInstanceState) { 
    View v = inflater.inflate(R.layout.contact, container, false); 
    mylistview = (ListView) v.findViewById(android.R.id.list); 
    return v; 
} 

getView() method: - Holen Sie sich die Root-Ansicht für das Layout des Fragments (die man zurück von onCreateView (LayoutInflater, Viewgroup, Bündel)), falls vorhanden.

Verwenden getView() Methode in Ihrem onActivityCreated Ihre Ansicht zu finden wie folgt

myListVIew = (ListView) getView().findViewById(R.id.list); 

Answer 2

ändern Sie Mehtod in Adapter wie diese

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    ViewHolder holder = null; 

    LayoutInflater mInflater = (LayoutInflater) context 
      .getSystemService(Activity.LAYOUT_INFLATER_SERVICE); 
    if (convertView == null) { 
     convertView = mInflater.inflate(R.layout.list_item, null); 
     holder = new ViewHolder(); 

     holder.member_name = (TextView) convertView 
       .findViewById(R.id.member_name); 
     holder.profile_pic = (ImageView) convertView 
       .findViewById(R.id.profile_pic); 
     holder.status = (TextView) convertView.findViewById(R.id.status); 
     holder.contactType = (TextView) convertView 
       .findViewById(R.id.contact_type); 


     convertView.setTag(holder); 
    } else { 
     holder = (ViewHolder) convertView.getTag(); 
    } 

     RowItem row_pos = rowItems.get(position); 

     holder.profile_pic.setImageResource(row_pos.getProfile_pic_id()); 
     holder.member_name.setText(row_pos.getMember_name()); 
     holder.status.setText(row_pos.getStatus()); 
     holder.contactType.setText(row_pos.getContactType()); 

    return convertView; 
}