我编写时间跟踪应用程序,listview的每一行都有两个按钮(“开始”和“停止”)和一些textView来显示经过的时间。
在列表视图中滚动后,将交换元素。
我不确定我的解决方案,但我放入模型类ViewHolder对象,以获取更改视图元素的权限。
这是代码模型的片段
private String name;
private Boolean isStart=false;
private Long elapsedTime=0L,seconds=0L,hours=0L,minutes=0L,lastPause=0L,updateTime=0L,startTime=0L,days=0L;
private Runnable updateTimeThread=new Runnable() {
@Override
public void run() {
if(isStart && startTime!=0) {
updateTime = ((System.currentTimeMillis() - startTime) + lastPause);
seconds = updateTime / 1000;
minutes = seconds / 60;
hours = minutes / 60;
seconds = seconds % 60;
minutes = minutes % 60;
hours = hours % 24;
holder.days.setText(String.format("%04d", days));
holder.hours.setText(String.format("%02d", hours));
holder.minutes.setText(String.format("%02d", minutes));
holder.seconds.setText(String.format("%02d", seconds));
Log.d("myTag",name+" "+seconds);
MainActivity.handler.post(this);
}
}
};
MyAdapter.ViewHolder holder;
public MyAdapter.ViewHolder getHolder() {
return holder;
}
public void setHolder(MyAdapter.ViewHolder holder) {
this.holder = holder;
}
public Runnable getRunnable() {
return updateTimeThread;
}
适配器的片段代码
public View getView(final int position, final View convertView, ViewGroup parent) {
View row = convertView;
final Tracker tracker = trackerList.get(position);
final Runnable updateTimeThread=tracker.getRunnable();
View.OnClickListener onClickListener;
ViewHolder holder;
if(row == null){
holder = new ViewHolder();
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(R.layout.row,parent,false);
holder.name = (TextView)row.findViewById(R.id.tvName);
holder.days = (TextView)row.findViewById(R.id.tvDays);
holder.hours = (TextView)row.findViewById(R.id.tvHours);
holder.minutes = (TextView)row.findViewById(R.id.tvMinutes);
holder.seconds = (TextView)row.findViewById(R.id.tvSeconds);
holder.start = (Button)row.findViewById(R.id.btStart);
holder.stop = (Button)row.findViewById(R.id.btStop);
row.setTag(holder);
}else {
holder = (ViewHolder) row.getTag();
}
holder.start.setEnabled(true);
holder.stop.setEnabled(false);
holder.name.setText(tracker.getName());
final ViewHolder finalHolder = holder;
if(tracker.getIsStart()){
holder.start.setEnabled(false);
holder.stop.setEnabled(true);
}
onClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btStart:
tracker.setStartTime(System.currentTimeMillis());
tracker.setIsStart(true);
tracker.setHolder(finalHolder);
MainActivity.handler.post(updateTimeThread);
finalHolder.start.setEnabled(false);
finalHolder.stop.setEnabled(true);
break;
case R.id.btStop:
tracker.setLastPause(tracker.getUpdateTime());
MainActivity.handler.removeCallbacks(updateTimeThread);
finalHolder.stop.setEnabled(false);
finalHolder.start.setEnabled(true);
tracker.setIsStart(false);
break;
}
}
};
holder.start.setOnClickListener(onClickListener);
holder.stop.setOnClickListener(onClickListener);
return row;
}
static class ViewHolder{
TextView name,days,hours,minutes,seconds;
Button start,stop;
}
我只是将这两种方法添加到我的适配器中)
@Override
public int getViewTypeCount() {
return getCount();
}
@Override
public int getItemViewType(int position) {
return position;
}
更新,但与加载程序回调问题仍然相同。我在上一个项目上按开始,然后向下滚动,看不到值,向上滚动一点并看到值。可怜。
更新2本文解决了我的问题,我只是将layout-height和laoyut-weight从“ wrap_content”更改为“ fill_parent”,以避免多次调用getView()方法。http://gmariotti.blogspot.com/2013/06/tips-for-listview-view-recycling-use.html
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我来说两句