使用Android语言写一个listview带倒计时功能的条目
时间: 2023-09-10 17:07:36 浏览: 71
好的,下面是一个使用Android语言写的带倒计时功能的ListView条目:
1. 首先,在布局文件中定义ListView的条目布局,可以包含一个TextView用于显示倒计时的时间。
```xml
<!-- list_item.xml -->
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="16dp">
<TextView
android:id="@+id/item_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Title"
android:textSize="16sp" />
<TextView
android:id="@+id/item_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00:00:00"
android:textSize="16sp" />
</LinearLayout>
```
2. 在适配器中定义倒计时的逻辑,更新时间的方法和getView()方法中更新时间的逻辑。
```java
public class MyAdapter extends BaseAdapter {
private Context mContext;
private List<MyData> mData;
public MyAdapter(Context context, List<MyData> data) {
mContext = context;
mData = data;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int position) {
return mData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item, parent, false);
holder = new ViewHolder();
holder.titleView = convertView.findViewById(R.id.item_title);
holder.timeView = convertView.findViewById(R.id.item_time);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
MyData data = mData.get(position);
holder.titleView.setText(data.getTitle());
long timeLeft = data.getEndTime() - System.currentTimeMillis();
if (timeLeft > 0) {
holder.timeView.setText(formatTime(timeLeft));
// 每隔1秒更新时间
holder.timeView.postDelayed(new Runnable() {
@Override
public void run() {
notifyDataSetChanged();
}
}, 1000);
} else {
holder.timeView.setText("已结束");
}
return convertView;
}
private String formatTime(long timeMillis) {
int hour = (int) (timeMillis / (60 * 60 * 1000));
int minute = (int) ((timeMillis / (60 * 1000)) % 60);
int second = (int) ((timeMillis / 1000) % 60);
return String.format("%02d:%02d:%02d", hour, minute, second);
}
private static class ViewHolder {
TextView titleView;
TextView timeView;
}
}
```
3. 在Activity中设置ListView的适配器和数据源。
```java
public class MainActivity extends AppCompatActivity {
private ListView mListView;
private MyAdapter mAdapter;
private List<MyData> mData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListView = findViewById(R.id.list_view);
// 初始化数据源
initData();
// 创建适配器
mAdapter = new MyAdapter(this, mData);
// 设置适配器
mListView.setAdapter(mAdapter);
}
private void initData() {
mData = new ArrayList<>();
// 假设有3个倒计时,分别为1分钟、2分钟和3分钟
for (int i = 1; i <= 3; i++) {
long endTime = System.currentTimeMillis() + i * 60 * 1000;
MyData data = new MyData("倒计时" + i, endTime);
mData.add(data);
}
}
private static class MyData {
private String title;
private long endTime;
public MyData(String title, long endTime) {
this.title = title;
this.endTime = endTime;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public long getEndTime() {
return endTime;
}
public void setEndTime(long endTime) {
this.endTime = endTime;
}
}
}
```
这样就可以在ListView的每个条目中显示倒计时了。注意在适配器中每隔1秒更新时间,这样就能保证倒计时能够正确显示。