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(); } }
May 12, 2019 at 11:34 am
Hey ma’am,
I have a question. I am implementing the same thing but the timer should run in the background for every item in recyleview even if the app is closed. I can use service for that but it only supports one-timer not all the timers in recyleview. Can you help me with it? Thanks in advance
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