Android 实现列表倒计时功能

发布时间：2020-08-21 21:47:11

来源：脚本之家

阅读：147

作者：Choi晨

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 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 {

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：

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

tools:context=".MainActivity">

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:id="@+id/btn"

android:text="ADD"

/>

android:id="@+id/rv"

android:layout_width="match_parent"

android:layout_height="match_parent">

//下面是item

android:layout_width="match_parent"

xmlns:tools="http://schemas.android.com/tools"

android:orientation="horizontal"

android:paddingBottom="@dimen/dp_10"

android:layout_height="60dp">

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" />

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" />

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