Countdown Timer in listview android

Here is an example of Countdown Timer in Listview android. I had used the recycler view instead of Listview. In this example I create the countdown timer in ViewHolder class.

Create a activity layout with RecyclerView. Download Source code here 

activity_main.xml

<RelativeLayout android:layout_width="match_parent"
 android:layout_height="match_parent"
 xmlns:android="http://schemas.android.com/apk/res/android">

 <android.support.v7.widget.RecyclerView
 android:id="@+id/recycler_view"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:scrollbars="vertical" />

 </RelativeLayout>



adapter_layout.xml Create a custom adapter layout for listview.

<?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="wrap_content">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15dp"
        android:padding="10dp"
        android:id="@+id/tv_timer"/>

</LinearLayout>

MainActivity.java

package com.androidsolutionworld.multipletimer;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.LinearLayout;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ArrayList al_data = new ArrayList<>();
    private Adapter obj_adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView)findViewById(R.id.recycler_view);
        al_data.add("1234");
        al_data.add("1257");
        al_data.add("100");
        al_data.add("1547");
        al_data.add("200");
        al_data.add("500");
        al_data.add("2000");
        al_data.add("1000");

        obj_adapter = new Adapter(al_data);
        LinearLayoutManager layoutManager = new LinearLayoutManager(getApplicationContext(),LinearLayoutManager.VERTICAL,false);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(obj_adapter);
    }
}

Custom Adapter:

package com.androidsolutionworld.multipletimer;


import android.os.CountDownTimer;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;

public class Adapter extends RecyclerView.Adapter{

    private ArrayList al_data;

    public class MyViewHolder extends RecyclerView.ViewHolder{
        public TextView tv_timer;
        CountDownTimer timer;

        public MyViewHolder (View view){
            super(view);
            tv_timer = (TextView)view.findViewById(R.id.tv_timer);

        }


    }

    public Adapter(ArrayList al_data) {
        this.al_data = al_data;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_layout,parent,false);


        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, int position) {

        holder.tv_timer.setText(al_data.get(position));

        if (holder.timer != null) {
            holder.timer.cancel();
        }
         long timer = Long.parseLong(al_data.get(position));

        timer = timer*1000;

        holder.timer = new CountDownTimer(timer, 1000) {
            public void onTick(long millisUntilFinished) {
              holder.tv_timer.setText("" + millisUntilFinished/1000 + " Sec");
            }

            public void onFinish() {
                holder.tv_timer.setText("00:00:00");
            }
        }.start();


    }

    @Override
    public int getItemCount() {
        return al_data.size();
    }



}