¿Cómo manejar múltiples temporizadores de cuenta regresiva en ListView?

Tengo una vista de lista (con un adaptador de lista personalizado), necesito mostrar una cuenta regresiva en cada fila.

Por ejemplo, si mi lista contiene 4 elementos, tendré 4 filas. En este punto, necesito manejar 4 cuentas regresivas diferentes (una para cada fila) porque el tiempo es diferente.

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Hasta ahora, lo estoy manejando de la siguiente manera: en el Custom List Adapter, dentro del método getView () creo un nuevo CountDownTimer y visualizo el tiempo restante dentro de TextView.

Pero el problema es que ralentiza mucho la actividad, ni siquiera puedo desplazarme correctamente en los peores casos (porque cada vez que se muestra una fila, crea un nuevo CountDownTimer).

Busqué mucho para encontrar una mejor solución, pero nadie me satisfizo.

¿Existe una solución más limpia y más suave para manejar múltiples temporizadores de cuenta atrás dentro de una lista?

Gracias

En lugar de intentar mostrar el tiempo restante para todos, la idea es actualizar el tiempo restante para los artículos que son visibles.

Por favor, siga el siguiente código de muestra y hágamelo saber:

Actividad principal :

public class MainActivity extends Activity { private ListView lvItems; private List lstProducts; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lvItems = (ListView) findViewById(R.id.lvItems); lstProducts = new ArrayList<>(); lstProducts.add(new Product("A", System.currentTimeMillis() + 10000)); lstProducts.add(new Product("B", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("C", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("D", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("E", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("F", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("G", System.currentTimeMillis() + 30000)); lstProducts.add(new Product("H", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("I", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("J", System.currentTimeMillis() + 40000)); lstProducts.add(new Product("K", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("L", System.currentTimeMillis() + 50000)); lstProducts.add(new Product("M", System.currentTimeMillis() + 60000)); lstProducts.add(new Product("N", System.currentTimeMillis() + 20000)); lstProducts.add(new Product("O", System.currentTimeMillis() + 10000)); lvItems.setAdapter(new CountdownAdapter(MainActivity.this, lstProducts)); } private class Product { String name; long expirationTime; public Product(String name, long expirationTime) { this.name = name; this.expirationTime = expirationTime; } } public class CountdownAdapter extends ArrayAdapter { private LayoutInflater lf; private List lstHolders; 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 CountdownAdapter(Context context, List objects) { super(context, 0, objects); lf = LayoutInflater.from(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 View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = lf.inflate(R.layout.list_item, parent, false); holder.tvProduct = (TextView) convertView.findViewById(R.id.tvProduct); holder.tvTimeRemaining = (TextView) convertView.findViewById(R.id.tvTimeRemaining); convertView.setTag(holder); synchronized (lstHolders) { lstHolders.add(holder); } } else { holder = (ViewHolder) convertView.getTag(); } holder.setData(getItem(position)); return convertView; } } private class ViewHolder { TextView tvProduct; TextView tvTimeRemaining; Product mProduct; public void setData(Product item) { mProduct = item; tvProduct.setText(item.name); updateTimeRemaining(System.currentTimeMillis()); } public void updateTimeRemaining(long currentTime) { long timeDiff = mProduct.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!!"); } } } } 

activity_main.xml:

     

list_item.xml

      

Puede ser tarde, pero esta es la versión de recyclerView que usa php y json basada en la excelente respuesta de @Eldhose M Babu. Espero ser útil 🙂

Visualización de fotos con cuenta regresiva múltiple

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

                  

y para la parte url puedes hacer algo como:

  "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); 

Por favor, eche un vistazo a este temporizador de cuenta regresiva en ListView android example.

Adaptador personalizado

 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(); } } 

Actividad principal

 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); } } 

Gracias

Clase de adaptador: –


la clase pública CountdownAdapter extiende RecyclerView.Adapter {ArrayList mList; Contexto mContext;

 public CountdownAdapter(ArrayList mList, Context mContext) { this.mList = mList; this.mContext = mContext; } public class ViewHolder extends RecyclerView.ViewHolder { CountDownTimer timerCount; TextView mCountDownTxt; public ViewHolder(View convertView) { super(convertView); mCountDownTxt = (TextView)convertView.findViewById(R.id.countdown_text); } } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { return null; } @Override public void onBindViewHolder(final ViewHolder holder, final int position) { if(holder.timerCount==null) { holder.timerCount = new CountDownTimer(mList.get(position), 1000) { @Override public void onTick(long millis) { String hms = String.format("%02d:%02d", TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)), TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis))); holder.mCountDownTxt.setText(hms); } @Override public void onFinish() { } }; } holder.mCountDownTxt.setVisibility(View.VISIBLE); holder.timerCount.start(); } @Override public int getItemCount() { return mList.size(); } 

}