Android 实现列表倒计时功能

所属分类：软件编程 / Android 阅读数： 74

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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>

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