onClickListener只在几次单击之后才能工作。

Question

我知道这不是一个很好的问题描述，但我无意中发现了我的ListAdapter的不稳定行为。

关键是，我的应用程序中的onItemClickListener只在疯狂单击的时候才会响应。调试器也只有在这种情况下才会响应。尽管如此，有时还是会很好地点击工作。似乎有什么东西在内部阻止onItemClickListener被调用。有时，即使是默认的android点击动画也不显示在第一次点击。虽然，在2-5点击之后，一个接一个的快速总是按照预期的工作。

作为Android开发的新手，我不知道从哪里开始寻找这个问题。问题不是特定于设备的(测试)。

以防万一，我的项目中有一些代码(尽管我甚至不确定要提供什么)：

一些来自OffersListAdapter:的代码

class ViewHolder {
    private TextView whoandWhom;
    private TextView date;
    private TextView distance;

    private TextView status;
    private TextView place;

    private boolean isMeeting = false;
    private Meeting.Status meetingStatus;

    private void color(int color) {
        for (Field v: this.getClass().getDeclaredFields()) {
            try {
                if (v.getType() == TextView.class) {
                    TextView view = (TextView) v.get(this);
                    view.setTextColor(res.getColor(color));
                }
            } catch (IllegalAccessException e) {
                Log.e("ERROR", "This field does not exist");
            }
        }
    }
}
private View prepareHolder(boolean isMeeting, View convertView, Meeting.Status mStatus, Offer offer) {
    ViewHolder holder = new ViewHolder();

    LayoutInflater li = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (isMeeting) {
        convertView = li.inflate(R.layout.meetings_item, null);
    } else {
        convertView = li.inflate(R.layout.offers_item, null);
    }
    holder.whoandWhom = (TextView)convertView.findViewById(R.id.datetime);
    holder.date = (TextView)convertView.findViewById(R.id.dateTime);
    holder.distance = (TextView)convertView.findViewById(R.id.distance);

    if (isMeeting) {
        holder.isMeeting = true;
        holder.status = (TextView)convertView.findViewById(status);
        holder.place = (TextView)convertView.findViewById(place);
        holder.meetingStatus = mStatus;
    }

    convertView.setTag(holder);

    holder.whoandWhom.setText(offer.getOwnership());
    holder.date.setText(offer.getDateRepresentation());
    String distance = new DecimalFormat("#####.##").format(offer.getDistance()) + " км";
    holder.distance.setText(distance);

    if (isMeeting) {
        Meeting meeting = (Meeting) offer;
        holder.place.setText(meeting.getPlace_name());
        switch (meeting.getStatus()) {
            case pending:
                holder.status.setText("Очікує підтвердження");
                break;
            case upcoming:
                holder.status.setText("Незабаром");
                holder.color(R.color.colorAccent);
                break;
            case completed:
                holder.status.setText("Завершено");
                holder.color(R.color.colorPrimary);
                break;
        }
    }

    return convertView;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder holder;
    Offer offer = this.getItem(position);
    Boolean isMeeting = offer.getClass() == Meeting.class;

    Meeting.Status status = null;
    if (isMeeting)
        status = ((Meeting) offer).getStatus();

    if (convertView == null) {
        convertView = prepareHolder(isMeeting, convertView, status, offer);
    } else {
        holder = (ViewHolder) convertView.getTag();
        if (isMeeting != holder.isMeeting)
            convertView = prepareHolder(isMeeting, convertView, status, offer);
        else if (isMeeting) {
            if (status != holder.meetingStatus)
                convertView = prepareHolder(true, convertView, status, offer);
        }
    }

    return convertView;
}

：MainActivity:中的几种方法

private void configureOffersOutput() {
    offersOutput = (ListView) findViewById(R.id.offersOutput);
    offersList = new ArrayList<Offer>();

    LayoutInflater li = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    loadingView = li.inflate(R.layout.list_footer_view, null);

    adapter = new OffersListAdapter(getApplicationContext(), offersList, getResources());

    configureOnItemClick();
    offersOutput.setAdapter(adapter);

    offersOutput.setNestedScrollingEnabled(true);
    offersOutput.setOnScrollListener(new AbsListView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState) {}
        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            if (view.getLastVisiblePosition() >= totalItemCount - 1 && !isLoading) {
                moreOffers();
            }
        }
    });
}


private void configureOnItemClick() {

    final Activity a = this;

    offersOutput.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            final Offer item = offersList.get(position);
            if (item.getClass() == Offer.class) {

                openActivity(a, SuggestActivity.class, new HashMap<String, String>() {{
                    put("id", item.getId());
                    put("location", item.getLocation());
                    put("datetime", item.getDateRepresentation());
                    put("ownership", item.getOwnership());

                    put("currentCoordinates", coordinates);
                    put("token", user.getToken());
                    put("uid", user.getId());
                }});

            } else if (item.getClass() == Meeting.class) {

                final Meeting meeting = (Meeting) item;
                Class<?> name;

                switch (meeting.getStatus()) {
                    case pending:
                        name = ApproveActivity.class;
                        break;
                    case upcoming:
                        name = UpcomingActivity.class;
                        break;
                    case completed:
                        name = RateActivity.class;
                        break;
                    default:
                        name = MeetingActivity.class;
                        Log.e("ERROR", "Wrong status: " + meeting.getStatus().toString());
                }

                final String distance = new DecimalFormat("#####.##").format(meeting.getDistance()) + " км";

                openActivity(a, name, new HashMap<String, String>(){{
                    put("id", meeting.getId());
                    put("datetime", meeting.getDateRepresentation());
                    put("ownership", meeting.getOwnership());

                    put("tel", meeting.getTel());
                    put("distance", distance);
                    put("place", meeting.getPlace_name());
                    put("place_coordinates", meeting.getPlace_coordinates());

                    put("currentCoordinates", coordinates);
                    put("token", user.getToken());
                    put("uid", user.getId());
                }});

            }
        }
    });

    initRefresh();

    isSetItemOnClick = true;
}

Answer 1

好吧，所以我想出了一个答案以防有人有同样的问题。

除此之外，我还有一个响应滚动事件的方法。它将按如下方式加载向下滚动的数据：

ffersOutput.setNestedScrollingEnabled(true);
    offersOutput.setOnScrollListener(new AbsListView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState) {}
        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            if (view.getLastVisiblePosition() >= totalItemCount - 1 && !isLoading) {
                moreOffers();
            }
        }
    });

moreOffers会发送一个请求到后端并加载行。

问题是：

1. DB非常快地耗尽行，因此它将接收空的结果。
2. 应用程序发送请求的速度如此之快，并且频繁地尝试刷新行，以至于它们在大多数情况下都无法对触摸做出响应。

解决方案(虽然很难看)：将以下内容添加到从DB接收数据的方法中：

new Timer().schedule(new TimerTask() {
    @Override
    public void run() {
        isLoading = false;
    }
}, 100);

这使得应用程序无法频繁地发出请求，因此它可以做出响应。