1. 技术文章
  2. How to handle multiple countdown timers in RecyclerView?

How to handle multiple countdown timers in RecyclerView?

由 北城余情 提交于 2019-12-03 17:23:41

Add a CountDownTimer member in the ViewHolder. In getView() set and start the counter, and don't forget to cancel any existing one in the same instance of ViewHolder. In onTick() you need to update the value on the display, not start the counter.

Hariharan B

The Simple Solution Would Be:

Handler handler=new Handler();
handler.postDelayed(new UpdateTimerThread(holder),0); 

public Class UpdateTimerThread implements Runnable{
Holder holder;

    public UpdateTimerThread(Holder holder){
        this.holder=holder;
    }
    @Override
    public void run() {
        lgetCreatedTime = lgetCreatedTime + 1000;
        long diffSeconds;
        long diffMinutes;
        long diffHours;
        diffSeconds = lgetCreatedTime / 1000 % 60;
        diffMinutes = lgetCreatedTime / (60 * 1000) % 60;
        diffHours = lgetCreatedTime / (60 * 60 * 1000) % 24;
        holder.GameTimer.setText(String.format("%02d:%02d:%02d", diffHours,   diffMinutes, diffSeconds));
        handler.postDelayed(this,1000);
    }
}

Note: 1.holder is the object of ViewHolder class

2.Create a class UpdateTimerThread implements Runnable

3.Convert Date and Time to long and store into lgetCreatedTime

4.Run Handler for every 1 Sec to tick the Time

You can create CountDownTimer reference in ViewHolder class and create its instance in onBindViewHolder method of Adapter.

It works perfectly.

Tested Myself.

Here you can check and download the source code of Countdown timers in a RecyclerView

activity_main.xml

<RelativeLayout android:layout_width=”match_parent”
android:layout_height=”match_parent”
xmlns:android=”http://schemas.android.com/apk/res/android”&gt;

<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

<?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:

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();
}

}
标签
android
android-layout
android-intent
android-recyclerview
countdown
易学教程内所有资源均来自网络或用户发布的内容，如有违反法律规定的内容欢迎反馈！
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!