通过自定义适配器的ListView迭代 [英] Iterate through ListView in custom Adapter

问题描述

我有一个自定义的的ListView 。每一行包含一个的TextView 和的ImageView 。

I have a custom ListView. Each row contains a TextView and ImageView.

看截图：

在项目点击我作出这样的的ImageView 可见。但问题是，只有一个的ImageView 应在同一时间可见。

On Item click I make that ImageView visible. But the problem is that only ONE ImageView should be visible at a time.

我认为最好的办法是将所有其他 ImageViews 为看不见上点击。而且走了之后的所有图像进行点击有一个可见。

I think that the best approach is to set all other ImageViews as INVISIBLE on click. And after all images gone make a clicked one VISIBLE.

但我不知道如何正确地进行迭代的适配器：

But I don't know how to iterate properly that in Adapter:

    private class TimeZoneItemAdapter extends ArrayAdapter<String> {
    private Activity myContext;
    private ArrayList<String> datas;


    public TimeZoneItemAdapter(Context context, int textViewResourceId, ArrayList<String> objects) {
        super(context, textViewResourceId, objects);

        myContext = (Activity) context;
        datas = objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder viewHolder;
        if (convertView == null) {
            LayoutInflater inflater = myContext.getLayoutInflater();

            convertView = inflater.inflate(R.layout.listview_item, null);

            viewHolder = new ViewHolder();
            viewHolder.postNameView = (TextView) convertView.findViewById(R.id.listview_item);
            viewHolder.postImageView = (ImageView) convertView.findViewById(R.id.image_mark);

            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.postNameView.setText(datas.get(position));

        viewHolder.postNameView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //clear all image views during iteration
                View view;
                for (int i = 0; i < datas.size(); i++) {
                    //dont know which parameter need there for proper iteration
                    view = getView(i, ?????, null);
                    ImageView image = (ImageView) view.findViewById(R.id.image_mark);
                    image.setVisibility(View.INVISIBLE);
                }

                if (viewHolder.postImageView.getVisibility() != View.VISIBLE) {
                    selectedTimeZone = viewHolder.postNameView.getText().toString();
                    viewHolder.postImageView.setVisibility(View.VISIBLE);
                } else {
                    viewHolder.postImageView.setVisibility(View.INVISIBLE);
                }
            }
        });
        return convertView;
    }

    class ViewHolder {
        TextView postNameView;
        ImageView postImageView;
    }
}

请帮我或给一些提示。我真的很困惑与已

Please help me or give some hints. I'm really confused with that already.

推荐答案

有一个解决方案：

private static View lastClicked = null;

... ...

viewHolder.postNameView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            View parentRow = (View) v.getParent();
            ViewHolder viewHolder = (ViewHolder)parentRow.getTag();

            if(viewHolder.postImageView.getVisibility() != View.VISIBLE) 
            {
                //clear last clicked image
                if(lastClicked != null)
                {
                   ViewHolder lastHolder = (ViewHolder)lastClicked.getTag();
                   lastHolder.postImageView.setVisibility(View.INVISIBLE);
                }

                selectedTimeZone = viewHolder.postNameView.getText().toString();
                viewHolder.postImageView.setVisibility(View.VISIBLE);
                lastClicked = parentRow;
            } 
            else 
            {
                viewHolder.postImageView.setVisibility(View.INVISIBLE);
                lastClicked = null;
            }

    });

希望这有助于！

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