I am trying to make an Android application with tabs and swipe view, and I have a list view inside one tab, and also I have added an image view to the list and I used a custom adapter to fill data in the list, I have some errors while loading data to the list (but works perfectly fine activity classes ) , lines and errors are written below
Adapter adapter=new Adapter(this, names , distripton, price, images);
error is the constructor Adapter(javafragment,string[],string[])is undefined
My xml page is
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_red_dark"
>
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</RelativeLayout>
And the java fragment class is
package com.example.newlistimage;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
public class Javaframent extends Fragment {
ListView lv;
String[] names={"haseem","hac"};
String[] distripton={"dis1","dis2"};
String[] price={"10","20"};
int[] images={R.drawable.ic_launcher,R.drawable.ic_launcher};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
lv=(ListView) getActivity().findViewById(R.id.listView1);
Adapter adapter=new Adapter(this, names , distripton, price, images);
lv.setAdapter(adapter);
return inflater.inflate(R.layout.java_layout ,container,false);
}
}
The custom adapter class
package com.example.newlistimage;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class Adapter extends ArrayAdapter<String> {
int[] images={};
String[] names={};
String[] prices={};
String[] discriptions={};
Context c;
LayoutInflater inflater;
public Adapter(Context context,String[] names,String[] distrion,String[] price,int[] img) {
super(context, R.layout.model,names);
this.c=context;
this.names=names;
this.prices=price;
this.discriptions=distrion;
this.images=img;
}
public class ViewHolder
{
TextView nametv;
TextView discriptiontv;
TextView pricetv;
ImageView images;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView==null)
{
inflater=(LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView=inflater.inflate(R.layout.model, null);
}
final ViewHolder holder=new ViewHolder();
holder.nametv=(TextView) convertView.findViewById(R.id.nametv);
holder.discriptiontv=(TextView) convertView.findViewById(R.id.discriptiontv);
holder.pricetv=(TextView) convertView.findViewById(R.id.moneytv);
holder.images=(ImageView) convertView.findViewById(R.id.imageView1);
holder.images.setImageResource(images[position]);
holder.nametv.setText(names[position]);
holder.pricetv.setText(prices[position]);
holder.discriptiontv.setText(discriptions [position]);
// return super.getView(position, convertView, parent);
return convertView;
}
}
The problem is here :
Adapter adapter=new Adapter(this, names , distripton, price, images);
in a Fragment in order to get the context you have to call getActivity()
method.
so your code would be like this :
Adapter adapter=new Adapter(getActivity(), names , distripton, price, images);
Update :
i think that NullPointerException is about this line of code :
lv=(ListView) getActivity().findViewById(R.id.listView1);
when you try to find your listview with the View of your activity while it's not there instead you should create a view and find your listview by that
i have edited your code this should work :
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View v = inflater.inflate(R.layout.java_layout ,container,false);
lv=(ListView) v.findViewById(R.id.listView1);
Adapter adapter=new Adapter(this, names , distripton, price, images);
lv.setAdapter(adapter);
return v;
}