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: android:text='ADD' /> <androidx.recyclerview.widget.RecyclerView android: 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: 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: 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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