Listview Widget in Android?

 ListView Widget in Android?

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It is used to display items using List form, List-display multiple rows, we can customize List Widget using CustomAdapter class.

Syntax of ListView Widget in Android:-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity17">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/lstview2"
        >

    </ListView>

</LinearLayout>

Example 1st:-

Create Normal ListView in Android Application:-

1) Create Activity and provide name Activity17

package com.example.additionapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity17 extends AppCompatActivity {

    ListView lstv;
    String arr[] = {"C","C++","JAVA",".NET","PHP","ANDROID","iOS","Data Science","MACHINE Learning","C","C++","JAVA",".NET","PHP","ANDROID","iOS","Data Science","MACHINE Learning"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main17);
        lstv = findViewById(R.id.lstview2);
        ArrayAdapter aa = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1,arr);
        lstv.setAdapter(aa);
        lstv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getApplicationContext(),"Selected Course is "+arr[position],Toast.LENGTH_LONG).show();
            }
        });


    }
}


2) <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity17">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/lstview2"
        >

    </ListView>

</LinearLayout>

Custom ListView:-

1)  Create Activity and Design ListView:-

package com.example.additionapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity17 extends AppCompatActivity {

    ListView lstv;
    int imgid[] = {R.drawable.bg,R.drawable.sss};
    String str[] = {"RAMESH","SURESH"};
   // String arr[] = {"C","C++","JAVA",".NET","PHP","ANDROID","iOS","Data Science","MACHINE Learning","C","C++","JAVA",".NET","PHP","ANDROID","iOS","Data Science","MACHINE Learning"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main17);
        lstv = findViewById(R.id.lstview2);
      //  ArrayAdapter aa = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1,arr);
       // lstv.setAdapter(aa);
        StuAdapter obj = new StuAdapter(getApplication(),imgid,str);
        lstv.setAdapter(obj);
        lstv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(getApplicationContext(),"Selected Course is "+str[position],Toast.LENGTH_LONG).show();
            }
        });


    }
}

2)  Design File:-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity17">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/lstview2"
        >

    </ListView>

</LinearLayout>

3)  Custom LisvIew:-

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

    <ImageView
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:id="@+id/custimgview"
        >

    </ImageView>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/custtextview"
        ></TextView>

</LinearLayout>


4)  Adpate class:-
package com.example.additionapplication;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;



public class StuAdapter extends BaseAdapter {
    int imgid[];
    String sname[];
    Context ctx;
    LayoutInflater inflter;
    StuAdapter(Context ctx,int imgid[],String sname[])
    {
        this.imgid = imgid;
        this.sname=sname;
        this.ctx =ctx;
        inflter = (LayoutInflater.from(ctx));
    }
    @Override
    public int getCount() {
        return sname.length;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

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

        View row = inflter.inflate(R.layout.custspinner_layout, parent, false);
        ImageView img = (ImageView) row.findViewById(R.id.custimgview);
        img.setImageResource(imgid[position]);
        TextView label = (TextView) row.findViewById(R.id.custtextview);
        label.setText(sname[position]);
        return row;
    }
}