我有一个包含 3 种元素的 ListView。Rows 和 QueueRows 是一组有点复杂的子控件，而 HeaderRow 只包含 textView。我所做的是添加 HeaderRow、少数 QueueRows、headerRow 和少数行。QueueRow 需要每秒更新一次。这就是为什么我编写了一个在适配器上调用 notifyDataSetChanged 的代码。它每秒更新一次 queuerow，但也有一个问题——我的两个标题交换了半秒钟的位置。每 0.5 秒后他们交换一次。你有任何想法如何防止它们？
那是我的代码：
class BuildingsAdapter extends ArrayAdapter<BaseRow> {
private static Bitmap SOURCE_BITMAP;
private MainActivity mainActivity_;
private Handler handler_;
private Runnable runnable_;
public BuildingsAdapter(MainActivity mainActivity) {
super(mainActivity, R.layout.row);
this.mainActivity_ = mainActivity;
SOURCE_BITMAP = BitmapFactory.decodeResource(
mainActivity_.getResources(), R.drawable.images);
handler_ = new Handler();
runnable_ = new Runnable() {
@Override
public void run() {
notifyDataSetChanged();
if (hasQueueItems())
handler_.postDelayed(runnable_, 1000);
}
};
}
@Override
public void add(BaseRow object) {
if (!hasQueueItems() && object.getClass().equals(QueueRow.class))
handler_.postDelayed(runnable_, 1000);
super.add(object);
}
private boolean hasQueueItems() {
for (int i = 0; i < getCount(); ++i) {
if (getItem(i).getClass().equals(QueueRow.class))
return true;
}
return false;
}
@Override
public int getItemViewType(int position) {
return getItem(position).getType();
}
@Override
public int getViewTypeCount() {
return 3;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
int type = getItemViewType(position);
View row = convertView;
switch (type) {
case BaseRow.QUEUE_ROW: {
QueueRowViewHolder holder = new QueueRowViewHolder();
//whatever
return convertView;
}
case BaseRow.ROW: {
RowViewHolder holder = new RowViewHolder();
//whatever
return convertView;
}
case BaseRow.HEADER_ROW: {
HeaderViewHolder holder = new HeaderViewHolder();
if (row == null) {
LayoutInflater inflater = (LayoutInflater) getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.header_row, parent, false);
HeaderRow headerRow = (HeaderRow) getItem(position);
holder.nameTextView_ = (TextView) row
.findViewById(R.id.categoryNameTextView);
holder.nameTextView_.setText(headerRow.getName());
row.setTag(holder);
} else {
holder = (HeaderViewHolder) row.getTag();
}
return row;
}
}
return null;
}
static class QueueRowViewHolder {
ImageView qItemImageView_;
TextView qItemNameTextView_;
ProgressBar qProgressBar_;
TextView qLevelTextView_;
TextView qTimeTextView_;
int position_;
}
static class RowViewHolder {
ImageView itemImageView_;
TextView nameTextView_;
TextView levelTextView_;
TextView woodTextView_;
TextView ironTextView_;
TextView stoneTextView_;
TextView goldTextView_;
Button actionButton_;
TextView timeTextView_;
}
static class HeaderViewHolder {
TextView nameTextView_;
}