在listview中使用cursorAdapter获取按钮点击的项目位置



我是一个android新手。我正在使用一个光标适配器和一个列表视图,其中有一个切换按钮和一个textview…当我点击切换按钮时,我需要获得点击事件和项目在列表中的位置。

我看到了很多线程,但我没有找到一个适合我的完美解决方案…

最后我决定在bindview中设置位置,并尝试在单击事件中检索它。但当我进入储物柜在点击事件的位置,我得到空指针异常。

请帮我这个家伙。谢谢你。

public class CalendarListAdapter extends CursorAdapter implements OnClickListener{

protected static class RowViewHolder {
    public TextView mTitle;
    public ToggleButton mButton;
    public int position;
}
    protected ListView calListView;

    @SuppressWarnings("deprecation")
    public CalendarListAdapter(Context context, Cursor c) {
        super(context, c);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        // TODO Auto-generated method stub
        TextView title = (TextView) view.findViewById(R.id.calendarName);
        System.out.println("cursor details"
                + cursor.getString(cursor.getColumnIndex(cursor
                        .getColumnName(1))));
        title.setText(cursor.getString(cursor.getColumnIndex(cursor
                .getColumnName(1))));
        Log.d("click position " , "position is " +cursor.getPosition() );
        ToggleButton button = (ToggleButton) view.findViewById(R.id.silentToggle);
        button.setOnClickListener(this);
        Log.d("click position " , "position is " +cursor.getPosition() );
    }
    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        // TODO Auto-generated method stub
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(context.LAYOUT_INFLATER_SERVICE);
        View calendarListView = inflater.inflate(R.layout.calendar_list_item, null);
        RowViewHolder rowView = new RowViewHolder();
        rowView.mTitle = (TextView)calendarListView.findViewById(R.id.calendarName);
        rowView.mButton = (ToggleButton) calendarListView.findViewById(R.id.silentToggle);
        rowView.position = cursor.getPosition();
        rowView.mTitle.setOnClickListener(titleOnClickListener);
        rowView.mButton.setOnClickListener(buttonOnClickListener);
        return calendarListView;
    }
    @Override
    public void onClick(View view) {
        // TODO Auto-generated method stub
        Log.d("item clicked", "clicked" );
        RowViewHolder holder = (RowViewHolder)view.getTag();
        int position = holder.position;
        Log.d("common  clicked", "clicked -" +position );

    }
    private OnClickListener titleOnClickListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            RowViewHolder holder = (RowViewHolder)v.getTag();
            int position = holder.position;
            Log.d("title clicked", "clicked -" +position );
        }
    };
    private OnClickListener buttonOnClickListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            RowViewHolder holder = (RowViewHolder)v.getTag();
            int position = holder.position;
            Log.d("button clicked", "clicked -" +position );
        }
    };
}

要能够使用v.g gettag(),您需要两个东西。在newView中你需要做

calendarListView.setTag(rowView);

和在bindView中,你需要将正确的数据插入到holder中:

rowView.position = cursor.getPosition(); // (same as in newView)

要使所有这些协同工作,您还需要确保您正在执行getTag()的视图是您执行setTag的视图。

在您的情况下,这意味着在newView:

中执行此操作
rowView.mTitle.setTag(rowView);
rowView.mButton.setTag(rowView);

根本不使用RowViewHolder可能会更简单。而是这样做:

在bindView:

int pos = cursor.getPosition();
title.setTag(pos);
button.setTag(pos);

然后在OnClickListeners中输入

Integer pos = (Integer) v.getTag();

祝你好运!

上面的setTag和getTag的答案对我来说很好,但不知怎的,我意识到标签上的数字并不总是正确的。检查后,我发现我的newView功能工作太多次,这就是为什么我所有的标签都是"0"。如果你有这个问题,检查一下

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