通过元数据从一个活动到下一个在Android的ListView [英] passing metadata from one activity to the next in an android listview

问题描述

据我所知，有用于从一个活动到下一个使用数据传递的一套方法，但如何将其从列表视图在活动范围内的模型？

例如：我有，我用它来填充列表视图的JSON对象。每个列表项都有一个id。我想ID传递给上点击下一个活动。我怎么知道ListView的项目ID？我不知道怎么任意元数据附加到ListView项，并立即抓住它，并一起传递。

 公共类StuffListActivity扩展ListActivity
{
    私人所有MyApplication应用= NULL;    / **
     *当第一次创建活动调用。
     *
     * @参数savedInstanceState保存实例状态
     * /
    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        应用=（（应用程序）getApplication（））;
        请求REQ =新请求（）;
        Application.log（listType.toString（））;
        ArrayList的＆LT;串GT;清单= req.getStuff（application.getId（），listType）;        适配器=新ArrayAdapter＆LT;串GT;（这一点，
                R.layout.list，R.id.stuff，清单）;
        setListAdapter（适配器）;
    }    保护无效onListItemClick（ListView中升，视图V，INT位置，长的ID）
    {
        字符串项=（字符串）getListAdapter（）的getItem（位置）。
        Toast.makeText（这一点，项目+选中，Toast.LENGTH_LONG）.show（）;
    }
}
 

解决方案

使用 setTag（）和 getTag（）属性中的适配器getView列表视图（）code ..存储和检索数据。

I understand that there's a set of methods used to pass data from one activity to the next using, but how do I model it from within the activity with the list view?

Example: I have a json object which i use to populate a listview. Each list item has an id. I want to pass the id to the next activity on click. How do I know that listview's item id? I wasn't sure how to attach arbitrary metadata to a listview item and immediately grab it and pass it along.

public class StuffListActivity extends ListActivity
{
    private MyApplication application = null;

    /**
     * Called when the activity is first created.
     *
     * @param savedInstanceState the saved instance state
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        application = ((Application) getApplication());
        Requestor req = new Requestor();
        Application.log(listType.toString());
        ArrayList<String> list = req.getStuff(application.getId(), listType);

        adapter = new ArrayAdapter<String>(this,
                R.layout.list, R.id.stuff, list);
        setListAdapter(adapter);    
    }

    protected void onListItemClick(ListView l, View v, int position, long id) 
    {
        String item = (String) getListAdapter().getItem(position);
        Toast.makeText(this, item + " selected", Toast.LENGTH_LONG).show();
    }
}

解决方案

Use setTag() and getTag() property for list view in Adapter getView() code.. to store and retrieve the data.

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