Question

此处的getView功能位于自定义类ArrayAdapter中。

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // Get the data item for this position
    Thing p = getItem(position);
    Thing.ThingStatus thingStatus = p.getStatus();

    int thingStatusIcon; // change to thingStatusResource
    switch (thingStatus) {
        case A:
            thingStatusIcon = ICON_A;
            break;
        case B:
            thingStatusIcon = ICON_B;
            break;
        default:
            thingStatusIcon = ICON_C;
            break;

    }

    // Check if an existing view is being reused, otherwise inflate the view
    ThingRowHolder viewHolder; // view lookup cache stored in tag
    if (convertView == null) {
        // If there's no view to re-use, inflate a brand new view for row
        viewHolder = new ThingRowHolder();
        LayoutInflater inflater = LayoutInflater.from(getContext());
        convertView = inflater.inflate(R.layout.thing_list_item, parent, false);
        // put these on the top like the colors
        viewHolder.thingIcon = (ImageView) convertView.findViewById(R.id.thing_icon);
        viewHolder.thingId = (TextView) convertView.findViewById(R.id.thing_id_item);
        viewHolder.thingStatus = (TextView) convertView.findViewById(R.id.thing_status_item);
        // Cache the viewHolder object inside the fresh view
        convertView.setTag(viewHolder);
    } else {
        // View is being recycled, retrieve the viewHolder object from tag
        viewHolder = (ThingRowHolder) convertView.getTag();
    }

    viewHolder.thingId.setText(p.getLpId());
    viewHolder.thingStatus.setText(thingStatus.toString());
    viewHolder.thingIcon.setImageResource(thingStatusIcon);
    viewHolder.position = position;
    return convertView;
}

我尝试为onClick中的每一行添加ListView事件监听器。我尝试在convertView语句内部和if语句之外的else上设置侦听器。我的结果好坏参半。有时onClick根本不会发射。其他时候会报告错误的立场。我已经搜索了SO的例子，我很惊讶这样一个共同的功能没有很好地记录和/或不适合我的情况。

非常感谢任何帮助！

编辑：

private class ThingRowHolder {
    ImageView thingIcon;
    TextView thingId;
    TextView thingStatus;
}

编辑2：

private void refreshList() {
    ArrayList<Thing> things = mThingContainer.getThings();
    Collections.sort(things);
    mThingListAdapter.refreshThings(things);
}

编辑3：

mThingListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        ThingListAdapter.ThingRowHolder holder =
                (ThingListAdapter.ThingRowHolder) view.getTag();
        Thing p = mThingContainer.getThings().get(holder.position);
    }
});

Answer 1

在getView方法中使用这些

如果您需要长时间点击

convertView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {}}

如果您想要正常点击

   convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {}}

Answer 2

将位置设置为视图的标记，

convertview.setTag(R.id.thing_icon, position);

现在在onClick(View v)，

int pos = (int)v.getTag(R.id.thing_icon);
Thing p = getItem(pos);

您现在可以根据需要使用p。

编辑1：更新适配器中的数据

在适配器中，添加以下方法：

public void updateData(List<Thing> data) {
        if (data != null) {
            mData.clear();
            mData.addAll(data);
            notifyDataSetChanged();
        }
    }

现在只需在需要更新数据时调用适配器的updateData方法。

使用高效的ListView适配器处理onClick

2 个答案: