Comment gérer plusieurs compteurs à rebours dans ListView?

J'ai une liste (avec un adaptateur de liste personnalisé), je dois afficher un compte à rebours sur chaque ligne.

Par exemple, si ma liste contient 4 éléments, j'aurai 4 lignes. À ce stade, j'ai besoin de gérer 4 comptes à rebours différents (un pour chaque ligne) car le temps est différent.

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    Jusqu'à présent, je le manipule de la manière suivante: dans l'adaptateur de liste personnalisé, à l'intérieur de la méthode getView (), je crée un nouveau CountDownTimer et affiche le temps restant dans TextView.

    Mais le problème, c'est qu'il ralentit beaucoup l'activité, je ne peux même pas défiler correctement dans les pires cas (car chaque fois qu'une ligne est affichée, elle crée un nouveau CountDownTimer).

    J'ai cherché beaucoup pour une meilleure solution, mais personne ne satisfaisait.

    Existe-t-il une solution plus propre et plus fluide pour gérer plusieurs compteurs à rebours à l'intérieur d'une liste?

    Merci

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  • 4 Solutions collect form web for “Comment gérer plusieurs compteurs à rebours dans ListView?”

    Au lieu d'essayer de montrer le temps restant pour tous, l'idée est de mettre à jour le temps restant pour les éléments qui sont visibles.

    Veuillez suivre l'exemple de code suivant et faites-le moi savoir:

    Activité principale :

    public class MainActivity extends Activity { private ListView lvItems; private List<Product> 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<Product> { private LayoutInflater lf; private List<ViewHolder> 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<Product> 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:

     <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ListView android:id="@+id/lvItems" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout> 

    List_item.xml

     <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="5dp"> <TextView android:id="@+id/tvProduct" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="10dp" android:text="Product Name" android:textSize="16dp" android:textStyle="bold" /> <TextView android:id="@+id/tvTimeRemaining" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="10dp" android:text="Time Remaining : " /> </LinearLayout> 

    Il pourrait être en retard, mais il s'agit de la version recyclerView en utilisant php et json en fonction de l'excellente réponse de @Eldhose M Babu. J'espère être utile 🙂

    Écran photo à décompte multiple

    Adapter.java

      public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> { private Context context; private final List<ViewHolder> lstHolders; public List<Model> 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<Model> 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<Model> 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<JSONArray>() { @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<array.length(); i++) { Model model = new Model(); JSONObject json = null; try { json = array.getJSONObject(i); model.setexpirationTime(json.getLong("expirationTime")); model.setName(json.getString("name")); } catch (JSONException e) { e.printStackTrace(); } lst.add(model); } adapter = new Adapter(lst, this); recyclerView.setAdapter(adapter); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); }} 

    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

     <?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" tools:context="here.math.MainActivity"> <android.support.design.widget.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/AppTheme.AppBarOverlay"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" /> </android.support.design.widget.AppBarLayout> <include layout="@layout/content_main" /> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin" android:src="@android:drawable/ic_dialog_email" /> </android.support.design.widget.CoordinatorLayout> 

    Content_main.xml

     <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" app:layout_behavior="@string/appbar_scrolling_view_behavior" tools:context="here.math.MainActivity" tools:showIn="@layout/activity_main"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="wrap_content"> </android.support.v7.widget.RecyclerView> </RelativeLayout> 

    List.xml

     <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v7.widget.CardView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="20dp"> <LinearLayout android:padding="@dimen/activity_horizontal_margin" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TableLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <TableRow> <TextView android:text="Expire time" android:paddingRight="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/cd" android:textStyle="bold" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </TableRow> <TableRow> <TextView android:text="Name" android:paddingRight="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/textViewName" android:textStyle="bold" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </TableRow> </TableLayout> </LinearLayout> </android.support.v7.widget.CardView> </RelativeLayout> 

    Et pour la partie url, vous pouvez faire quelque chose comme ça:

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

    Jetez un coup d'oeil sur cette Minuterie de compte à rebours dans l' exemple de listeview android .

    Adaptateur personnalisé

     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<Adapter.MyViewHolder>{ private ArrayList<String> 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<String> 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(); } } 

    Activité principale

     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<String> 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); } } 

    Merci

    Classe d'adaptateur: –


    La classe publique CountdownAdapter étend RecyclerView.Adapter {ArrayList mList; Contexte mContext;

     public CountdownAdapter(ArrayList<Long> 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(); } 

    }

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