在OnBindViewHolder中单击listener
在OnBindViewHolder中单击listener
提问于 2018-06-06 04:09:30
我有以下代码，用于我正在开发的android应用程序的recyclerview适配器：
@Override
public void onBindViewHolder(final FeedViewHolder contactViewHolder, final int i) {
final FeedInfo ci = feedInfoList.get(i);
//Set the text of the feed with your data
contactViewHolder.feedText.setText(ci.getFeed());
contactViewHolder.surNameText.setText(ci.getSurName());
contactViewHolder.nameText.setText(ci.getFirstName());
contactViewHolder.feedDate.setText(ci.getDate());
contactViewHolder.numberOfGoingText.setText(ci.getNumber_of_going());
contactViewHolder.numberOfInterestedText.setText(ci.getNumber_of_interested());
//seteaza fotografia de profil in postare
new ProfilePictureDownloadImage(contactViewHolder.profilePicture).execute(ci.getProfileImageURL());
ImageButton interestedButton = contactViewHolder.interestedButton;
interestedButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int position = i;
FeedInfo fi = feedInfoList.get(position);
int displayedNumberOfInterested = Integer.parseInt(ci.getNumber_of_interested()) + 1;
contactViewHolder.numberOfInterestedText.setText(Integer.toString(displayedNumberOfInterested));
System.out.println("emilutzy interested from within" + fi.getPostID());
contactViewHolder.surNameText.setText("kk");
}
});
}问题出在单击监听程序。理论上，我按下的按钮应该会递增它旁边的数字。但是，由于我必须将onBindViewHolder的参数声明为final，所以只有第一次单击才有效，其余的单击都不会更改数字的值。我刚接触Android，所以你能帮我找到一个更好的解决方案吗？
回答 2
Stack Overflow用户
回答已采纳
发布于 2018-06-06 04:26:40
您可以在RecyclerView的ViewHolder中使用一个名为getAdapterPosition()的很好的方法。
不是在onBindViewHolder中设置单击侦听器，而是在ViewHolder的构造函数中设置它，如下所示：
public class FeedViewHolder extends RecyclerView.ViewHolder {
private TextView feedText;
private TextView surNameText;
private Button interestedButton;
// ... the rest of your viewholder elements
public FeedViewHolder(View itemView) {
super(itemView);
feedtext = itemView.findViewById(R.id.feedtext);
// ... find your other views
interestedButton.setOnClickListener(new View.OnClickListener() {
final FeedInfo fi = feedInfoList.get(getAdapterPosition());
int numInterested = Integer.parseInt(ci.getNumber_of_interested()) + 1;
// setting the views here might work,
// but you will find that they reset themselves
// after you scroll up and down (views get recycled).
// find a way to update feedInfoList,
// I like to use EventBus to send an event to the
// host activity/fragment like so:
EventBus.getDefault().post(
new UpdateFeedInfoListEvent(getAdapterPosition(), numInterested));
// in your host activity/fragment,
// update the list and call
// notifyDatasetChanged/notifyDataUpdated()
//on this RecyclerView adapter accordingly
});
}
}不要将你在onBindViewHolder中的位置设置为final (Android Studio会警告你为什么)。
Stack Overflow用户
发布于 2018-06-06 04:18:13
我不确定对象FeedInfo是什么样子的，但您也可以使用一个名为increaseNumberOfInterested()的方法，该方法将Number_of_interested的值增加1，并在循环视图回收单元格时持久化在对象中。它就像下面这样
@Override
public void onBindViewHolder(final FeedViewHolder contactViewHolder, final int i) {
final FeedInfo ci = feedInfoList.get(i);
//Set the text of the feed with your data
contactViewHolder.numberOfInterestedText.setText(ci.getNumber_of_interested());
contactViewHolder.interestedButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Increase the number of interested in the object, so it can be persisted when cell is reclycled
ci.setNumberOfInterested(ci.getNumber_of_interested()) + 1);
//Get new value and display
contactViewHolder.numberOfInterestedText.setText(Integer.toString(ci.getNumber_of_interested()));
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50708180
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