add custom adapter for my listView in android

This example demonstrates how do I add custom adapter for my listView in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

Step 3 − Add the following code to src/MainActivity.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
ListView listView;
ArrayList<MyData> arrayList = new ArrayList<>();
MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.listView);
arrayList.add(new MyData(1, " Mashu","987576443"));
arrayList.add(new MyData(2, " Azhar","8787576768"));
arrayList.add(new MyData(3, " Niyaz","65757657657"));
adapter = new MyAdapter(this, arrayList);
listView.setAdapter(adapter);
}
}

Step 4 − Create a java class(MyData.java) and add the following code
public class MyData {
private int serialNum;
private String name;
private String mobileNumber;
public MyData(int num, String name, String mobileNumber) {
this.serialNum = num;
this.name = name;
this.mobileNumber = mobileNumber;
}
public int getNum() {
return serialNum;
}
public void setNum(int num) {
this.serialNum = num;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMobileNumber() {
return mobileNumber;
}
public void setMobileNumber(String mobileNumber) {
this.mobileNumber = mobileNumber;
}
}

Step 5 − Create a java class(MyAdapter.java) and add the following code −
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;
public class MyAdapter extends BaseAdapter {
private Context context;
private ArrayList<MyData> arrayList;
private TextView serialNum, name, contactNum;
public MyAdapter(Context context, ArrayList<MyData> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
@Override
public int getCount() {
return arrayList.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = LayoutInflater.from(context).inflate(R.layout.row, parent, false);
serialNum = convertView.findViewById(R.id.serailNumber);
name = convertView.findViewById(R.id.studentName);
contactNum = convertView.findViewById(R.id.mobileNum);
serialNum.setText(" " + arrayList.get(position).getNum());
name.setText(arrayList.get(position).getName());
contactNum.setText(arrayList.get(position).getMobileNumber());
return convertView;
}
}