Android 实现列表倒计时功能

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;
}

<?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