Android 实现列表倒计时功能

单个计时器，然后遍历数据 刷新条目；

两种实现方式：1、Handler轮询； 2、子线程睡眠（时间到后 移除列表中的条目会有问题）；

代码很简单，没有任何难度，列表使用 RecyclerView+BaseRecyclerViewAdapterHelper实现；

implementation 'androidx.recyclerview:recyclerview:1.1.0'
 implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:3.0.1'

public class MainActivity extends AppCompatActivity {
 private RecyclerView rv;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  rv = findViewById(R.id.rv);
  initView();
  initData();
  findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
    quickAdapter.addData(0,new TimeBean("附加商品、离活动结束还剩：" , 99));
    rv.scrollToPosition(0);
   }
  });
 }
 private QuickAdapter quickAdapter;
 private void initView() {
  quickAdapter = new QuickAdapter(R.layout.item);
  rv.setLayoutManager(new LinearLayoutManager(this));
  rv.setAdapter(quickAdapter);
  rv.setItemAnimator(null);
  Countdown();
 }
 private void initData() {
  List<TimeBean> datas = new ArrayList<>();
  for (int i = 1; i < 10; i++) {
   datas.add(new TimeBean("商品" + i + "、离活动结束还剩：", (i + 5) * i));
  }
  quickAdapter.setNewData(datas);
 }
 private class QuickAdapter extends BaseQuickAdapter<TimeBean, BaseViewHolder> {
  public QuickAdapter(int layoutResId) {
   super(layoutResId);
  }
  @Override
  protected void convert(BaseViewHolder vh, TimeBean datas) {
   vh.setText(R.id.tv, datas.getStr() + "");
   vh.setText(R.id.tv2, datas.getTime() + "s");
  }
 }
 private Handler mHandler = new Handler();
 private Runnable runnable;
 private void Countdown() {
  runnable = new Runnable() {
   @Override
   public void run() {
    for (int i = 0; i < quickAdapter.getData().size(); i++) {
     TimeBean bean = quickAdapter.getData().get(i);
     if (bean.getTime() > 0) {
      bean.setTime(bean.getTime() - 1);
      quickAdapter.setData(i, bean);
     } else {
      quickAdapter.remove(i);
     }
    }
    mHandler.postDelayed(runnable, 1000L);
   }
  };
  mHandler.postDelayed(runnable, 1000L);
 }
 private void Countdown2() {
  new Thread(new Runnable() {
   @Override
   public void run() {
    while (true){
     SystemClock.sleep(1000L);
     for (int i = 0; i < quickAdapter.getData().size(); i++) {
      final TimeBean bean = quickAdapter.getData().get(i);
      final int finalI = i;
      if (bean.getTime() > 0) {
       bean.setTime(bean.getTime() - 1);
       runOnUiThread(new Runnable() {
        @Override
        public void run() {
         quickAdapter.setData(finalI, bean);
        }
       });
      } else {
       // 当时间是0时 移除条目（子线程加睡眠模式移除条目有问题，原因时数据源未更新）
       runOnUiThread(new Runnable() {
        @Override
        public void run() {
         quickAdapter.remove(finalI);
        }
       });
      }
     }
    }
   }
  }).start();
 }
 @Override
 protected void onDestroy() {
  super.onDestroy();
  mHandler.removeCallbacks(runnable);
  mHandler.removeCallbacksAndMessages(null);
  mHandler = null;
 }
public class TimeBean {
 public TimeBean(String str, int time) {
  this.str = str;
  this.time = time;
 }
 private String str;
 private int time;
}

Get 、 Set方法就不写了；

布局文件：

<?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=".MainActivity">
 <Button
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:id="@+id/btn"
  android:text="ADD"
  />
 <androidx.recyclerview.widget.RecyclerView
  android:id="@+id/rv"
  android:layout_width="match_parent"
  android:layout_height="match_parent"></androidx.recyclerview.widget.RecyclerView>
</LinearLayout>
//下面是item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 xmlns:tools="http://schemas.android.com/tools"
 android:orientation="horizontal"
 android:paddingBottom="@dimen/dp_10"
 android:layout_height="60dp">
 <TextView
  android:background="#33fb1212"
  android:id="@+id/tv"
  tools:text="你好啊"
  android:gravity="center_vertical"
  android:textSize="17dp"
  android:paddingLeft="15dp"
  android:textColor="#333"
  android:layout_width="0dp"
  android:layout_weight="2"
  android:layout_height="match_parent" />
 <TextView
  android:background="#33fb1212"
  android:id="@+id/tv2"
  tools:text="0s"
  android:gravity="center_vertical"
  android:textSize="17dp"
  android:paddingLeft="15dp"
  android:textColor="#333"
  android:layout_width="0dp"
  android:layout_weight="1"
  android:layout_height="match_parent" />
</LinearLayout>

总结

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