How to handle multiple countdown timers in ListView?

Question

I have a listview (with a custom list adapter), I need to display a countdown on every row.

For example, if my list contains 4 items, I will have 4 rows. At this po

Answer 1

It might be late but this is recyclerView version using php and json based on excellent answer of @Eldhose M Babu. Hope to be helpful :)

Adapter.java

    public class Adapter extends RecyclerView.Adapter {

    private Context context;
    private final List lstHolders;
    public List lst;

    private Handler mHandler = new Handler();
    private Runnable updateRemainingTimeRunnable = new Runnable() {
        @Override
        public void run() {
            synchronized (lstHolders) {
                long currentTime = System.currentTimeMillis();
                for (ViewHolder holder : lstHolders) {
                    holder.updateTimeRemaining(currentTime);
                }
            }
        }
    };

    public Adapter(List lst, Context context){
        super();
        this.lst = lst;
        this.context = context;
        lstHolders = new ArrayList<>();
        startUpdateTimer();
    }

    private void startUpdateTimer() {
        Timer tmr = new Timer();
        tmr.schedule(new TimerTask() {
            @Override
            public void run() {
                mHandler.post(updateRemainingTimeRunnable);
            }
        }, 1000, 1000);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.setData(lst.get(position));
        synchronized (lstHolders) {
            lstHolders.add(holder);
        }
        holder.updateTimeRemaining(System.currentTimeMillis());
    }

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

    class ViewHolder extends RecyclerView.ViewHolder{
        public TextView textViewName;
        public TextView tvTimeRemaining;
        Model mModel;

        public void setData(Model item) {
            mModel = item;
            textViewName.setText(item.name);
            updateTimeRemaining(System.currentTimeMillis());
        }

        public void updateTimeRemaining(long currentTime) {
            long timeDiff = mModel.expirationTime - currentTime;
            if (timeDiff > 0) {
                int seconds = (int) (timeDiff / 1000) % 60;
                int minutes = (int) ((timeDiff / (1000 * 60)) % 60);
                int hours = (int) ((timeDiff / (1000 * 60 * 60)) % 24);

                tvTimeRemaining.setText(hours + " hrs " + minutes + " mins " + seconds + " sec");
            } else {
                tvTimeRemaining.setText("Expired!!");
            }
        }

        public ViewHolder(View itemView) {
            super(itemView);
            tvTimeRemaining = (TextView) itemView.findViewById(R.id.cd);
            textViewName = (TextView) itemView.findViewById(R.id.textViewName);
        }
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

private List lst;
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    recyclerView.setHasFixedSize(true);
    layoutManager = new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);
    lst = new ArrayList<>();
    getData();


    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show();
        }
    });
}

private void getData(){
    final ProgressDialog loading = ProgressDialog.show(this,"Loading Data", "Please wait...",false,false);

    JsonArrayRequest jsonArrayRequest = new JsonArrayRequest("http://192.168.200.102/api.php",
            new Response.Listener() {
                @Override
                public void onResponse(JSONArray response) {
                    loading.dismiss();
                    parseData(response);
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {

                }
            });

    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(jsonArrayRequest);
}

private void parseData(JSONArray array){
    for(int i = 0; i

Model.java

public class Model {
public String name;
public long expirationTime;

public long getexpirationTime() {
    return expirationTime;
}

public void setexpirationTime(long expire) {
    this.expirationTime = expire;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}}

activity_main.xml

content_main.xml

list.xml

and for url part you can do something kind of:

 "Android",
        'expirationTime' => 1456860322 * 1000, // timestamp multiply for display in milliseconds
),
array(
        'name' => "Android 2",
        'expirationTime' => 1456900522 * 1000,
),
array(
        'name' => "Android 3",
        'expirationTime' =>  1459509819 * 1000,
),
array(
        'name' => "Android 4",
        'expirationTime' => 1457021950 * 1000,
),
);

echo json_encode($arr);