Android ListView with snippet

Question

I am working on my school project, which is based on a fragment. I made XML files, but I get an error in nearfragment.java. Could you tell me where the error is, since I am familiar with Activity, but not with Fragment. Please help me fix the error.

near_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="{relativePackage}.${activityClass}" >

    <ListView
        android:id="@+id/list_li"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >
    </ListView>

</RelativeLayout>

near_layout_mylist.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="horizontal" >

    <ImageView
        android:id="@+id/icon_list"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:padding="5dp" />

    <LinearLayout android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/item_list"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Medium Text"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="5dp"
            android:padding="2dp"
            android:textColor="#33CC33" />
        <TextView
            android:id="@+id/textView1_list"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView"
            android:layout_marginLeft="10dp"/>
    </LinearLayout>
</LinearLayout>

CustomListNearAdapter.java

import android.app.Activity;
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 CustomListNearAdapter extends ArrayAdapter<String> {

    private final Activity context;
    private final String[] itemname;
    private final Integer[] imgid;

    public CustomListNearAdapter(Activity context, String[] itemname, Integer[] imgid) {
        super(context, R.layout.near_layout_mylist, itemname);
        // TODO Auto-generated constructor stub

        this.context=context;
        this.itemname=itemname;
        this.imgid=imgid;
    }

    public View getView(int position,View view,ViewGroup parent) {
        LayoutInflater inflater=context.getLayoutInflater();
        View rowView=inflater.inflate(R.layout.near_layout_mylist, null,true);

        TextView txtTitle = (TextView) rowView.findViewById(R.id.item_list);
        ImageView imageView = (ImageView) rowView.findViewById(R.id.icon_list);
        TextView extratxt = (TextView) rowView.findViewById(R.id.textView1_list);

        txtTitle.setText(itemname[position]);
        imageView.setImageResource(imgid[position]);
        extratxt.setText("Description "+itemname[position]);
        return rowView;

    };
}

Nearfragment

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.GridView;
import android.widget.ListView;

/**
 * Created by Ratan on 7/29/2015.
 */
public class NearFragment extends Fragment {



    ListView list;
    String[] itemname ={
            "Safari",
            "Camera",
            "Global",
            "FireFox",
            "UC Browser",
            "Android Folder",
            "VLC Player",
            "Cold War"
    };

    Integer[] imgid={
            R.drawable.akash,
            R.drawable.akash,
            R.drawable.akash,
            R.drawable.akash,
            R.drawable.akash,
            R.drawable.akash,
            R.drawable.akash,
            R.drawable.akash,
    };

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        View view = inflater.inflate(R.layout.near_layout, container,false);
        CustomListNearAdapter adapter=new CustomListNearAdapter(this, itemname, imgid);

        ListView listView = (ListView) view.findViewById(R.id.list_item);
        listView.setAdapter(new CustomListNearAdapter(getActivity()));
        return view;


    }


}

The error is almost fragmentation, I cannot write code for the fragment. So please give me some tips.

Answer 1

In your code, you do not pass the correct values ​​to the constructor during installation adapter, which means in the line of your code.

listView.setAdapter(new CustomListNearAdapter(getActivity()));

, .

        CustomListNearAdapter adapter=new CustomListNearAdapter(getActivity(), itemname, imgid);

        ListView listView = (ListView) view.findViewById(R.id.list_li);
        listView.setAdapter(adapter);

Answer 2

getActivity()

CustomListNearAdapter adapter=new CustomListNearAdapter(this, itemname, imgid);

listview, .

listView.setAdapter(adapter);

Answer 3

I suggest you write code for ListViewafter loading activity. So make your code as below:

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.near_layout, container, false);
    return view;
}

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

    CustomListNearAdapter adapter=new CustomListNearAdapter(getActivity(), itemname, imgid);
    ListView listView = (ListView) view.findViewById(R.id.list_item);
    listView.setAdapter(new CustomListNearAdapter(getActivity()));
}

getActivity()may cause a problem here since this activity was not created. In addition, you did not properly initialize the adapter. You did not enter all values.

Answer 4

Cancel your code as follows.

 View view = inflater.inflate(R.layout.near_layout, container,false);

    ListView listView = (ListView) view.findViewById(R.id.list_item);
    listView.setAdapter(new CustomListNearAdapter(getActivity(), itemname, imgid));
    return view;