Android中怎么利用ListView实现列表实现倒计时功能

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1. Activity

package com.s296267833.ybs.activity.firstPage.timedown;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ListView;import com.s296267833.ybs.R;import java.util.ArrayList;import java.util.List; /** * ListView列表实现倒计时 * */public class TimeDownActivity extends AppCompatActivity {   private TimeDownLvAdapter mAdapter;  private ListView mListView;   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_time_down);    mListView= findViewById(R.id.lv_time_down);    setAdapter();  }   /**   * 设置适配器   * */  private void setAdapter() {    mAdapter = new TimeDownLvAdapter(this,getTimerItemList());    mListView.setAdapter(mAdapter);  }   /**   * 设置倒计时的数据   * */  public static List<TimeDownItem> getTimerItemList() {    List<TimeDownItem> lstTimeDownItems = new ArrayList<>();    lstTimeDownItems.add(new TimeDownItem("A千万种心动", System.currentTimeMillis() + 11 * 1000));    lstTimeDownItems.add(new TimeDownItem("B千万种心动", System.currentTimeMillis() + 22 * 1000));    lstTimeDownItems.add(new TimeDownItem("C千万种心动", System.currentTimeMillis() + 26 * 1000));    lstTimeDownItems.add(new TimeDownItem("D千万种心动", System.currentTimeMillis() + 33 * 1000));    lstTimeDownItems.add(new TimeDownItem("E千万种心动", System.currentTimeMillis() + 24 * 1000));    lstTimeDownItems.add(new TimeDownItem("F千万种心动", System.currentTimeMillis() + 98 * 1000));    lstTimeDownItems.add(new TimeDownItem("G千万种心动", System.currentTimeMillis() + 14 * 1000));    lstTimeDownItems.add(new TimeDownItem("H千万种心动", System.currentTimeMillis() + 36 * 1000));    lstTimeDownItems.add(new TimeDownItem("I千万种心动", System.currentTimeMillis() + 58 * 1000));    lstTimeDownItems.add(new TimeDownItem("J千万种心动", System.currentTimeMillis() + 47 * 1000));    lstTimeDownItems.add(new TimeDownItem("K千万种心动", System.currentTimeMillis() + 66 * 1000));    lstTimeDownItems.add(new TimeDownItem("L千万种心动", System.currentTimeMillis() + 55 * 1000));    lstTimeDownItems.add(new TimeDownItem("M千万种心动", System.currentTimeMillis() + 62 * 1000));    lstTimeDownItems.add(new TimeDownItem("N千万种心动", System.currentTimeMillis() + 45 * 1000));    lstTimeDownItems.add(new TimeDownItem("O千万种心动", System.currentTimeMillis() + 14 * 1000));    return lstTimeDownItems;  }   /**   * 清空当前 CountTimeDown 资源   * */  @Override  protected void onDestroy() {    super.onDestroy();    if (mAdapter != null) {      mAdapter.cancelAllTimers();    }  }}

2.activity_time_down布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout   xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context="com.s296267833.ybs.activity.firstPage.timedown.TimeDownActivity">  <ListView    android:id="@+id/lv_time_down"    android:background="#faa"    android:pider="#00000000"    android:layout_width="match_parent"    android:layout_height="match_parent">  </ListView></LinearLayout>

3. ListView的item类（TimeDownItem）

package com.s296267833.ybs.activity.firstPage.timedown; /** * Created by JiYaRuo on 2019/1/9. * @BeUsedFor 倒计时Lv的Bean类 */ public class TimeDownItem {  //其他属性  public String name;  //倒计时长，单位毫秒  public long expirationTime;  public TimeDownItem(String name, long expirationTime) {    this.name = name;    this.expirationTime = expirationTime;  }}

4.listview的item布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout   xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="64dp"  android:orientation="horizontal"  android:padding="10dp">  <TextView    android:id="@+id/tv_status"    android:layout_width="0dp"    android:layout_height="wrap_content"    android:layout_weight="1"    tools:text="status"    android:textColor="#ffffff"    android:layout_gravity="center"    android:gravity="center" />  <TextView    android:id="@+id/tv_time"    android:layout_width="0dp"    android:layout_height="wrap_content"    android:layout_weight="1"    android:textSize="15sp"    android:gravity="right"    android:textColor="#ffffff"    android:layout_gravity="center_vertical"    tools:text="00:00:00"/></LinearLayout>

5. ListView的适配器TimeDownLvAdapter

package com.s296267833.ybs.activity.firstPage.timedown;import android.content.Context;import android.os.CountDownTimer;import android.util.SparseArray;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;import com.s296267833.ybs.R;import com.s296267833.ybs.activity.firstPage.TimeUtils;import java.util.List; /** * Created by JiYaRuo on 2019/1/9. * @BeUsedFor 列表倒计时listView的适配器 */ public class TimeDownLvAdapter extends BaseAdapter {   private List<TimeDownItem> mDatas;  private Context mContext;  //用于退出 Activity,避免 Countdown，造成资源浪费。  private SparseArray<CountDownTimer> countDownCounters;   public TimeDownLvAdapter(Context mContext, List<TimeDownItem> mDatas) {    this.mContext = mContext;    this.mDatas = mDatas;    this.countDownCounters = new SparseArray<>();  }   @Override  public int getCount() {    if (mDatas != null && !mDatas.isEmpty()) {      return mDatas.size();    }    return 0;  }   @Override  public Object getItem(int position) {    if (mDatas != null && !mDatas.isEmpty()) {      return mDatas.get(position);    }    return null;  }   @Override  public long getItemId(int position) {    return position;  }   @Override  public View getView(int position, View convertView, ViewGroup parent) {    final ViewHolder viewHolder;    if (convertView == null) {      convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item_common, parent, false);      viewHolder = new ViewHolder();      viewHolder.statusTv = (TextView) convertView.findViewById(R.id.tv_status);      viewHolder.timeTv = (TextView) convertView.findViewById(R.id.tv_time);      convertView.setTag(viewHolder);    } else {      viewHolder = (ViewHolder) convertView.getTag();    }    final TimeDownItem data = mDatas.get(position);    viewHolder.statusTv.setText(data.name);     CountDownTimer countDownTimer = countDownCounters.get(viewHolder.timeTv.hashCode());    if (countDownTimer != null) {      //将复用的倒计时清除      countDownTimer.cancel();    }    long timer = data.expirationTime;    timer = timer - System.currentTimeMillis();    //expirationTime 与系统时间做比较，timer 小于零，则此时倒计时已经结束。    if (timer > 0) {      countDownTimer = new CountDownTimer(timer, 1000) {        public void onTick(long millisUntilFinished) {          viewHolder.timeTv.setText(TimeUtils.getCountTimeByLong(millisUntilFinished));        }        public void onFinish() {          viewHolder.timeTv.setText("00:00:00");          viewHolder.statusTv.setText(data.name + ":结束");        }      }.start();      //将此 countDownTimer 放入list.      countDownCounters.put(viewHolder.timeTv.hashCode(), countDownTimer);    } else {      viewHolder.timeTv.setText("00:00:00");      viewHolder.statusTv.setText(data.name + ":结束");    }    return convertView;  }   /**   * ViewHolder内部类   * */  public class ViewHolder {    public TextView statusTv;    public TextView timeTv;  }   /**   * 清空当前 CountTimeDown 资源   */  public void cancelAllTimers() {    if (countDownCounters == null) {      return;    }    for (int i = 0, length = countDownCounters.size(); i < length; i++) {      CountDownTimer cdt = countDownCounters.get(countDownCounters.keyAt(i));      if (cdt != null) {        cdt.cancel();      }    }  }}

6.工具类TimeUtils

package com.s296267833.ybs.activity.firstPage; /** * Created by JiYaRuo on 2019/1/9. * @BeUsedFor 倒计时工具类 */ public class TimeUtils {  /**   * 毫秒换成00:00:00   * */  public static String getCountTimeByLong(long finishTime) {    int totalTime = (int) (finishTime / 1000);//秒    int hour = 0, minute = 0, second = 0;    if (3600 <= totalTime) {      hour = totalTime / 3600;      totalTime = totalTime - 3600 * hour;    }    if (60 <= totalTime) {      minute = totalTime / 60;      totalTime = totalTime - 60 * minute;    }    if (0 <= totalTime) {      second = totalTime;    }    StringBuilder sb = new StringBuilder();    if (hour < 10) {      sb.append("0").append(hour).append(":");    } else {      sb.append(hour).append(":");    }    if (minute < 10) {      sb.append("0").append(minute).append(":");    } else {      sb.append(minute).append(":");    }    if (second < 10) {      sb.append("0").append(second);    } else {      sb.append(second);    }    return sb.toString();  }   /**   * 将LONG类型的时间戳转换为xx:xx:xx时分秒   * */  public static String formatLongToTimeStr(Long l) {    int hour = 0;    int minute = 0;    int second = 0;    second = l.intValue() ;    if (second > 60) {      minute = second / 60;     //取整      second = second % 60;     //取余    }    if (minute > 60) {      hour = minute / 60;      minute = minute % 60;    }    String strtime = hour+"："+minute+"："+second;    return strtime;  }}

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