How to avoid duplicate listitems from being repeating?

 Hello friends ,in this post i will show you how to avod list items from being duplicate.
  Here is the code:
 
File name: MainActivity.java

import android.app.Activity;

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public class MainActivity extends Activity{

 Listview listview; 
 Customlist cl;
 ArrayList<Student> title=new ArrayList<Student>();
 Student s=new Student();
 @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
     listview=findViewById(R.id.ListView1);
     s.setName("Android");
     title.add(s);
     also use setList method
     cl.setList(title);
  cl=new Customlist(this,title);
     listview.setAdapter(title);
}

Create custom inner class

class Customlist extends BaseAdapter {
    Context mContext;
    String data;
    ArrayList<Student> mtitle=new ArrayList<Student>();

    public Customlist(Context mContext,ArrayList<Student> mtitle){
        this.mContext=mContext;
        this.mtitle=mtitle;
    }

    public void setList(ArrayList<Student> mtitle){
        this.mtitle=mtitle;
        notifyDataSetChanged();
    }
    @Override    public int getCount() {
        return mtitle.size();
    }

    @Override    public Object getItem(int position) {
        return mtitle.get(position);
    }

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

    @Override    public View getView(final int position, View convertView, ViewGroup parent) {
        View v=convertView;
        Holder h=null;

           if(v==null){
            LayoutInflater mLayoutInflater=(LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v=mLayoutInflater.inflate(R.layout.listitem,null);
            h.name=(TextView)v.findViewById(R.id.tv_name);
            v.setTag(h);        

          }else{

                 h=(Holder)v.getTag();

             }

         name.setText(mtitle.get(position).getName()));
        return v;
    }
    static class Holder{
       TextView name;
     }

}

}

  Last create Student class:

  Filename :Student.java

  public class Student{

    String name;

   public String getName(){

     return name;

   } 

    public void setName(String name){

       this.name=name;

    }

    }