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Я хочу создать ListView в фрагменте для чатов, как WhatsApp, но адаптер показывает нуль. Ниже мой код:ListView имеет значение null в фрагменте
ChatsFragment.java
package com.houssup.userchat;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import java.util.ArrayList;
public class ChatsFragment extends Fragment {
ListView list;
CustomChatAdapter adapter;
public ChatsFragment chatsFragment = null;
public ArrayList<ListModel> CustomListViewValuesArr = new ArrayList<ListModel>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.customrow_chat, container, false);
ListView lv= (ListView)view.findViewById(R.id.list); // List defined in XML (See Below)
/**************** Create Custom Adapter *********/
setListData();
adapter=new CustomChatAdapter(getContext(), CustomListViewValuesArr);
lv.setAdapter(adapter);
return view;
}
public void setListData()
{
for (int i = 0; i < 11; i++) {
final ListModel sched = new ListModel();
/******* Firstly take data in model object ******/
sched.setName("Swapnil"+i);
sched.setDesignation("Interior Designer"+i);
/******** Take Model Object in ArrayList **********/
CustomListViewValuesArr.add(sched);
}
}
}
CustomChatAdapter.java
package com.houssup.userchat;
import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.content.res.Resources;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import de.hdodenhof.circleimageview.CircleImageView;
/**
* Created by hp on 01-06-2016.
*/
public class CustomChatAdapter extends BaseAdapter{
private Context context;
private ArrayList data;
private static LayoutInflater inflater=null;
ListModel tempValues=null;
int i=0;
/************* CustomChatAdapter Constructor *****************/
public CustomChatAdapter(Context context, ArrayList d) {
/********** Take passed values **********/
this.context=context;
data=d;
/*********** Layout inflator to call external xml layout() ***********/
inflater = (LayoutInflater)context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
/******** What is the size of Passed Arraylist Size ************/
public int getCount() {
if(data.size()<=0)
return 1;
return data.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
/********* Create a holder Class to contain inflated xml file elements *********/
public static class ViewHolder{
public TextView name;
public TextView designation;
public CircleImageView image;
}
/****** Depends upon data size called for each row , Create each ListView row *****/
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
ViewHolder holder;
if(convertView==null){
/****** Inflate tabitem.xml file for each row (Defined below) *******/
vi = inflater.inflate(R.layout.customrow_chat, null);
/****** View Holder Object to contain tabitem.xml file elements ******/
holder = new ViewHolder();
holder.name = (TextView) vi.findViewById(R.id.name);
holder.designation=(TextView)vi.findViewById(R.id.designation);
holder.image= (CircleImageView) vi.findViewById(R.id.image);
/************ Set holder with LayoutInflater ************/
vi.setTag(holder);
}
else
holder=(ViewHolder)vi.getTag();
if(data.size()<=0)
{
holder.name.setText("No Data");
}
else
{
/***** Get each Model object from Arraylist ********/
tempValues=null;
tempValues = (ListModel) data.get(position);
/************ Set Model values in Holder elements ***********/
holder.name.setText(tempValues.getName());
holder.designation.setText(tempValues.getDesignation());
holder.image.setImageResource(R.drawable.circuladp);
/******** Set Item Click Listner for LayoutInflater for each row *******/
/* vi.setOnClickListener(new OnItemClickListener(position));*/
}
return vi;
}
/* @Override
public void onClick(View v) {
Log.v("CustomChatAdapter", "=====Row button clicked=====");
}*/
/********* Called when Item click in ListView ************/
/* private class OnItemClickListener implements View.OnClickListener {
private int mPosition;
OnItemClickListener(int position){
mPosition = position;
}
*//*@Override
public void onClick(View arg0) {
CustomListViewAndroidExample sct = (CustomListViewAndroidExample)activity;
*//**//**** Call onItemClick Method inside CustomListViewAndroidExample Class (See Below)****//**//*
sct.onItemClick(mPosition);
}*/
}
fragment_chats.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.houssup.userchat.ChatsFragment">
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
</FrameLayout>
customrow_chat.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="wrap_content"
android:orientation="horizontal">
<de.hdodenhof.circleimageview.CircleImageView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/profile_image"
android:layout_width="60dp"
android:layout_height="60dp"
android:src="@drawable/circuladp"
app:civ_border_width="2dp"
app:civ_border_color="#FF000000"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:orientation="vertical">
<TextView
android:id="@+id/name"
android:layout_below="@id/title"
android:text="Yashvant Rai Bacchhan"
android:layout_marginLeft="50dp"
android:textSize="18dp"
android:textColor="#000000"
android:layout_marginTop="10dp"
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/designation"
android:layout_width="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginTop="6dp"
android:layout_marginLeft="55dp"
android:textSize="14dp"
android:layout_height="wrap_content"
android:text="Designer"/>
</LinearLayout>
</LinearLayout>
Этот фрагмент находится в TabActivity.I не знаю, почему он показывает null. Любая помощь будет оценена!
Что означает, что адаптер показывает нуль? – Lino
@Lino Я получаю исключение null-указателя на lv.setAdapter (адаптер) – Neer
Код выглядит прекрасно до сих пор, поэтому единственное, что я могу придумать, это то, что R.id.list ошибочен. Хотите поделиться файлом xml-макета? – GPuschka