标签：android listview countdowntimer multiplying
我的Listview有问题,我想为所有ListView的项目设置一个倒数计时器,我已经用Google搜索了一个解决方案,但它无法正常工作.问题是ListView重用(回收)一个视图,我总是得到一个错误的项目时间.我使用标签作为我的观点,但它仍然不起作用,我无法理解我在哪里犯了错误,请帮助我.谢谢.
所以这里有一张图片显示我的问题：
pic1我刚开始活动的地方;
pic2我只是向下滚动
在这里我的代码(全班)：
更新
public class PromoListActivity extends SherlockActivity {
private ListView mPromoList;
private PromoListAdapter mAdapter;
private ViewFlipper mFlipper;
private Button mBtnRepeat;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_news_list);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
setTitle("Сохранённые акции");
mFlipper = (ViewFlipper) findViewById(R.id.flipper);
mPromoList = (ListView) findViewById(R.id.newsList);
mBtnRepeat = (Button) findViewById(R.id.btnRepeat);
//-->
final Handler timerHandler = new Handler();
Runnable timerRunnable = new Runnable() {
@Override
public void run() {
mAdapter.notifyDataSetChanged();
timerHandler.postDelayed(this, 1000); // run every minute
}
};
//<--
mBtnRepeat.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
mFlipper.setDisplayedChild(0);
getDummyData();
}
});
mPromoList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
startActivity(new Intent(PromoListActivity.this, PromoActivityDetails.class));
}
});
getDummyData();
}
private class PromoListAdapter extends BaseAdapter {
private ArrayList<PromoAction> mItems = new ArrayList<PromoAction>();
private LayoutInflater layoutInflater;
private PromoListAdapter(Context context, ArrayList<PromoAction> mItems) {
layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.mItems = mItems;
}
public int getCount() {
return mItems.size();
}
public PromoAction getItem(int position) {
return mItems.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewItem viewItem;
PromoAction promoAction = getItem(position);
if (convertView == null) {
viewItem = new ViewItem();
convertView = layoutInflater.inflate(R.layout.listviewitem_action, null);
viewItem.name = (TextView) convertView.findViewById(R.id.promoAction_name);
viewItem.desc = (TextView) convertView.findViewById(R.id.promoAction_desc);
viewItem.timer = (TextView) convertView.findViewById(R.id.promoAction_timer);
viewItem.timer.setTag(position);
convertView.setTag(viewItem);
} else {
viewItem = (ViewItem) convertView.getTag();
}
setTime(promoAction,viewItem.timer,viewItem.timer.getTag().toString());
viewItem.name.setText(promoAction.name);
viewItem.desc.setText(promoAction.descr);
return convertView;
}
private void setTime(final PromoAction promoAction, final TextView tv, final String tag) {
if (tv.getTag().toString().equals(tag)) {
long outputTime = Math.abs(promoAction.timer_end
- System.currentTimeMillis());
Date date = new java.util.Date(outputTime);
String result = new SimpleDateFormat("hh:mm:ss").format(date);
tv.setText(result);
}
}
public class ViewItem {
TextView name;
TextView desc;
TextView timer;
}
}
private void getDummyData() {
ArrayList<PromoAction> list = new ArrayList<PromoAction>();
for (int i = 1; i < 10; i++) {
PromoAction action = new PromoAction();
action.name = "Lorem ipsum dolor sit amet";
action.descr = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. ";
switch (i) {
case 1: {
action.timer_start = 1385971000;
action.timer_end = 1386104000;
}
case 2: {
action.timer_start = 1385889000;
action.timer_end = 1385812550;
break;
}
case 3: {
action.timer_start = 1385884200;
action.timer_end = 1385912100;
break;
}
default: {
action.timer_start = 1385856000;
action.timer_end = 1385892000;
break;
}
}
list.add(action);
}
mAdapter = new PromoListAdapter(PromoListActivity.this, list);
mPromoList.setAdapter(mAdapter);
mFlipper.setDisplayedChild(1);
}
}
解决方法:
在我的情况下,我解决了这个问题.我没有在你的getView()中设置一个计时器处理程序,而是在每次调用getView()时设置当前时间和你想要的TextView所需时间之间的时差.所以将你的代码移回getView()：
long outputTime = Math.abs(promoAction.timer_end
- System.currentTimeMillis());
Date date = new java.util.Date(outputTime);
String result = new SimpleDateFormat("hh:mm:ss").format(date);
tv.setText(result);
然后在活动中创建一个处理程序,在listview的适配器上每隔一分钟调用notifyDatasetChanged()：
Handler timerHandler = new Handler();
Runnable timerRunnable = new Runnable() {
@Override
public void run() {
myAdapter.notifyDataSetChanged();
timerHandler.postDelayed(this, 60000); //run every minute
}
};
我在onPause()上停止了这个处理程序：
@Override
protected void onPause() {
timerHandler.removeCallbacks(timerRunnable);
super.onPause();
}
我在onResume()上再次启动它：
@Override
protected void onResume() {
timerHandler.postDelayed(timerRunnable, 500);
super.onResume();
}
就是这样.
标签：android,listview,countdowntimer,multiplying 来源： https://codeday.me/bug/20191008/1869757.html
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