我需要在时间过期后删除项目，部分我通过引用此How to handle multiple countdown timers in ListView?
获得输出滚动列表后，某些已过期的项目不会被删除，时间也不会更新。
package com.techno.deliveryboy.Adapter;
import android.os.Handler;
import android.support.v4.app.FragmentActivity;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.techno.deliveryboy.Pojos.DummyTimer;
import com.techno.deliveryboy.R;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
/**
* Created by developer on 23/7/16.
*/
public class Incoiming_orders_Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private LayoutInflater lf;
Boolean onBind = true;
private List<MyViewHolder> lstHolders;
ArrayList<Integer> unbindvalues=new ArrayList<>();
private Handler mHandler = new Handler();
List<DummyTimer> lstProducts=new ArrayList<>();
private Runnable updateRemainingTimeRunnable = new Runnable() {
@Override
public void run() {
synchronized (lstHolders) {
long currentTime = System.currentTimeMillis();
for (MyViewHolder holder : lstHolders) {
holder.updateTimeRemaining(currentTime);
}
}
}
};
public Incoiming_orders_Adapter(FragmentActivity activity, List<DummyTimer> lstProduct) {
lstHolders = new ArrayList<>();
lstProducts=lstProduct;
startUpdateTimer();
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.incoming_orders_item, parent, false);
return new MyViewHolder(itemView);
}
private void startUpdateTimer() {
Timer tmr = new Timer();
tmr.schedule(new TimerTask() {
@Override
public void run() {
mHandler.post(updateRemainingTimeRunnable);
}
}, 1000, 1000);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if(holder instanceof MyViewHolder){
onBind=true;
MyViewHolder holder1= (MyViewHolder) holder;
synchronized (lstHolders) {
lstHolders.add(holder1);
}
holder1.setData(lstProducts.get(position),position);
onBind=false;
}
}
@Override
public int getItemCount() {
return lstProducts.size();
}
public void removeAt(int position) {
/* for (Iterator<MyViewHolder> iterator = lstHolders.iterator(); iterator.hasNext();) {
iterator.remove();
}*/
if(!onBind) {
if(unbindvalues!=null&&unbindvalues.size()!=0&&position>=0){
for (Integer i:unbindvalues) {
lstProducts.remove(position);
notifyItemRemoved(position);
}
unbindvalues.clear();
}else {
if(position>=0){
lstProducts.remove(position);
notifyItemRemoved(position);
}
}
notifyDataSetChanged();
}else {
System.out.println("+Bind->true+");
if(position>=0)
unbindvalues.add(position);
}
}
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView title, tvTimeRemaining, genre;
DummyTimer mProduct;
public void setData(DummyTimer item, int position) {
mProduct = item;
title.setText(item.name);
updateTimeRemaining(System.currentTimeMillis());
}
public MyViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.Item_Totalvalue);
tvTimeRemaining= (TextView) view.findViewById(R.id.Item_timeout);
}
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(String.valueOf(getAdapterPosition()));
removeAt(getAdapterPosition());
}
}
}
@Override
public long getItemId(int position) {
return position;
}
}
请发表评论。
答案 0 :(得分：3)
您可以通过设置每秒触发onTick()方法的CountDownTimer来实现此目的。在onTick()方法中检查是否存在过期的对象？如果您发现任何对象，请致电notifyItemRemoved()。
以下是回收商视图适配器的代码：
私有类RecyclerViewAdapter扩展了RecyclerView.Adapter { private ArrayList mData;
public RecyclerViewAdapter(ArrayList<RowData> data) {
mData = data;
//find out the maximum time the timer
long maxTime = System.currentTimeMillis();
for (RowData item : mData) {
maxTime = Math.max(maxTime, item.endTime);
}
//set the timer which will refresh the data every 1 second.
new CountDownTimer(maxTime - System.currentTimeMillis(), 1000) {
@Override
public void onTick(long l) {
for (int i = 0, dataLength = mData.size(); i < dataLength; i++) {
RowData item = mData.get(i);
item.timeRemaining -= 1000;
}
//remove the expired items
Iterator<RowData> dataIterator = mData.iterator();
while (dataIterator.hasNext()) {
RowData rd = dataIterator.next();
if (rd.timeRemaining <= 0) dataIterator.remove();
}
notifyDataSetChanged();
}
@Override
public void onFinish() {
mData.clear();
notifyDataSetChanged();
}
}.start();
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new MyViewHolder(LayoutInflater.from(MainActivity.this).inflate(android.R.layout.simple_list_item_2, parent, false));
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
RowData rowData = mData.get(position);
holder.titleTv.setText(rowData.title);
holder.remainingTimeTv.setText(millToMins(rowData.timeRemaining) + " mins remaining");
}
private String millToMins(long millisec) {
return millisec / (60000) + ":" + (int) (millisec/1000) % (60);
}
@Override
public int getItemCount() {
return mData.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
private TextView remainingTimeTv;
private TextView titleTv;
public MyViewHolder(View itemView) {
super(itemView);
remainingTimeTv = (TextView) itemView.findViewById(android.R.id.text2);
titleTv = (TextView) itemView.findViewById(android.R.id.text1);
}
}
}
答案 1 :(得分：0)
你想要的东西与过滤器类似，不同之处在于你希望删除该项目。我建议为列表中的所有计时器设置 Observer ，并且每当计时器超过计划时，您必须更新观察者，这将从您拥有的项目的列表或arraylist中删除它。通知您的数据集已发生更改，这将刷新您的RecyclerView。
答案 2 :(得分：0)
您可以定期进行操作设置，以便从RecyclerView适配器中删除项目。以下是一个粗略的例子。
首先，定义表示列表项的项类：
import android.text.format.DateFormat;
public class TimedItem {
private final long expireAt;
private final String name;
public TimedItem(String name, long expireAt) {
this.name = name;
this.expireAt = expireAt;
}
public String getName() {
return name;
}
public String getDescription(){
return String.format("Expires at %s.", DateFormat.format("h:mm:ss a ddd, MMM, YYYY",this.expireAt));
}
public boolean isExpired(){
return System.currentTimeMillis() > this.expireAt;
}
}
由于要使用RecyclerView显示项目，因此也要定义ViewHolder：
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
public class TimedItemHolder extends RecyclerView.ViewHolder {
private final TextView nameView;
private final TextView descView;
public TimedItemHolder(View itemView) {
super(itemView);
this.nameView = (TextView) itemView.findViewById(android.R.id.text1);
this.descView = (TextView) itemView.findViewById(android.R.id.text2);
}
public TextView getNameView() {
return nameView;
}
public TextView getDescView() {
return descView;
}
}
现在，要在RecycleView中显示项目，我们需要定义RecyclerView.Adapter。这也将在到期时处理项目删除：
import android.os.Handler;
import android.os.Looper;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
public class TimerAdapter extends RecyclerView.Adapter<TimedItemHolder> {
private final List<TimedItem> items = new ArrayList<>();
private final Handler handler = new Handler(Looper.getMainLooper());
private final long interval;
private final Runnable task = new Runnable() {
@Override
public void run() {
int i = 0;
Iterator<TimedItem> iterator = TimerAdapter.this.items.iterator();
while (iterator.hasNext()) {
TimedItem item = iterator.next();
if (item.isExpired()) {
iterator.remove();
notifyItemRemoved(i);
} else {
i++;
}
}
handler.postDelayed(this, interval);
}
};
public TimerAdapter(long interval) {
this.interval = interval;
handler.postDelayed(task, interval);
}
public void addItem(TimedItem item) {
this.items.add(item);
}
public void addAll(Collection<? extends TimedItem> items) {
this.items.addAll(items);
}
public void clear() {
this.items.clear();
}
@Override
public TimedItemHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(android.R.layout.simple_list_item_2, parent, false);
return new TimedItemHolder(view);
}
@Override
public void onBindViewHolder(TimedItemHolder holder, int position) {
TimedItem item = this.items.get(position);
holder.getNameView().setText(item.getName());
holder.getDescView().setText(item.getDescription());
}
@Override
public int getItemCount() {
return this.items.size();
}
@Override
protected void finalize() throws Throwable {
super.finalize();
handler.removeCallbacks(task);
}
}
最后，我们可以测试一下：
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import java.util.Random;
public class TestActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
RecyclerView list = new RecyclerView(this);
list.setLayoutManager(new LinearLayoutManager(this));
TimerAdapter adapter = new TimerAdapter(1000);
list.setAdapter(adapter);
setContentView(list);
Random random = new Random();
for (int i = 0; i < 20; i++) {
String name = "Item: " + i;
long expireAt = System.currentTimeMillis() + 5000 + random.nextInt(20000);
adapter.addItem(new TimedItem(name,expireAt));
}
adapter.notifyDataSetChanged();
}
}