如何创建列表视图onItemclicklistener [英] How to create listview onItemclicklistener

问题描述

我要创建列表视图。我从JSON的价值。在这里，我从JSON到列表视图的价值，但我不能让onItemclickListener方法。为什么会这样，我不知道，请帮我，我的代码如下所示。

LogCat中不显示任何内容。

感谢。

 ＆LT;的ListView
    机器人：ID =@ + ID / contests_listView
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =FILL_PARENT
    机器人：layout_below =@ + ID /头
    机器人：可聚焦=真正的＆GT;
＆LT; / ListView控件＆GT;
 

Activity.java

 公共类Activites_Activity扩展CheerfoolznativeActivity {

私人的ListView contests_listView;
私人进度PGB;
ActivitiesBean豆;
ArrayList的＆LT;对象＆gt; listActivities;
ListAdapter适配器;

保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;

    的setContentView（R.layout.activity_listview）;
    SetHeader可以（Activites）;


    contests_listView =（ListView控件）findViewById（R.id.contests_listView）;
    PGB =（进度）findViewById（R.id.contests_progressBar）;
    listActivities =新的ArrayList＆LT;对象＆gt;（）;

    新FetchActivitesTask（）执行（）。

}

公共类FetchActivitesTask扩展的AsyncTask＆LT;虚空，虚空，虚空＆GT; {

    INT I = 0;
    @覆盖
    在preExecute保护无效（）{
        // TODO自动生成方法存根
        super.on preExecute（）;
         pgb.setVisibility（View.VISIBLE）;
    }

    @覆盖
    保护无效doInBackground（虚空...... PARAMS）{
        // TODO自动生成方法存根

        字符串URL =我的JSON的URL;
        字符串strResponse = util.makeWebCall（URL）;

        尝试 {

            //我的JSON这里的逻辑
        }
        赶上（JSONException E）{

            e.printStackTrace（）;

        }

        返回null;
    }

    @覆盖
    公共无效onPostExecute（无效的结果）{
        // TODO自动生成方法存根
        super.onPostExecute（结果）;

        pgb.setVisibility（View.GONE）;
        displayAdapter（）;
    }
}

公共无效displayAdapter（）
{
    适配器=新ListAdapter（这一点，listActivities）;
    contests_listView.setAdapter（适配器）;
    contests_listView.setOnItemClickListener（新OnItemClickListener（）{

        @覆盖
        公共无效onItemClick（适配器视图＆LT;＆GT;为arg0，查看ARG1，
                INT位置，长的id）{

            // Toast.makeText（getApplicationContext（），标题=＆gt;中+ items.get（位置），Toast.LENGTH_SHORT）.show（）;

            的System.out.println（===========点击）;
            豆=（ActivitiesBean）adapter.getItem（位置）;

            意图IN1 =新的意图（Activites_Activity.this，Activity_display.class）;
            in1.putExtra（ActivityObject，豆）;
            startActivity（IN1）;
        }
    }）;


}
}
 

我也用这个

  contests_listView.setItemsCanFocus（真正的）;
 

解决方案

试试这个：

  contests_listView.setOnItemClickListener（新android.widget.AdapterView.OnItemClickListener（）{
@覆盖
公共无效onItemClick（适配器视图＆LT;＆GT;母公司视图中查看，INT位置，长的id）{
字符串项= contests_listView.getItemAtPosition（位置）;
Toast.makeText（这一点，你已经选择：+项目，Toast.LENGTH_SHORT）.show（）;
            }
        }）;
 

I want to create listview. I got the value from the JSON. Here I got the value from the json into listview but i can't get the onItemclickListener method. Why this is happening I don't know ,Please help me my coding as shown below.

Logcat is not displaying anything.

Thanks.

<ListView
    android:id="@+id/contests_listView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" 
    android:layout_below="@+id/header"
    android:focusable="true">
</ListView>

Activity.java

public class Activites_Activity extends CheerfoolznativeActivity {

private ListView contests_listView;
private ProgressBar pgb;
ActivitiesBean bean;
ArrayList<Object> listActivities;
ListAdapter adapter;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_listview);
    setHeader("Activites");


    contests_listView = (ListView) findViewById(R.id.contests_listView);
    pgb = (ProgressBar) findViewById(R.id.contests_progressBar);
    listActivities = new ArrayList<Object>();

    new FetchActivitesTask().execute();

}

public class FetchActivitesTask extends AsyncTask<Void, Void, Void> {

    int i =0;
    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();
         pgb.setVisibility(View.VISIBLE);
    }

    @Override
    protected Void doInBackground(Void... params) {
        // TODO Auto-generated method stub

        String url = "my json URL";
        String strResponse = util.makeWebCall(url);

        try {

            //my json logic here        
        }
        catch (JSONException e) {

            e.printStackTrace();

        }

        return null;
    }

    @Override
    public void onPostExecute(Void result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);

        pgb.setVisibility(View.GONE);
        displayAdapter();
    }
}

public void displayAdapter()
{
    adapter = new ListAdapter(this, listActivities);
    contests_listView.setAdapter(adapter);
    contests_listView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1,
                int position, long id) {

            // Toast.makeText(getApplicationContext(),"Title => "+items.get(position), Toast.LENGTH_SHORT).show();

            System.out.println("=========== Click");
            bean = (ActivitiesBean) adapter.getItem(position);

            Intent in1 = new Intent(Activites_Activity.this, Activity_display.class);
            in1.putExtra("ActivityObject", bean);
            startActivity(in1);
        }
    });


}
}

I also use this

contests_listView.setItemsCanFocus(true);

解决方案

Try this :

contests_listView.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
String item = contests_listView.getItemAtPosition(position);
Toast.makeText(this,"You selected : " + item,Toast.LENGTH_SHORT).show();                
            }
        });

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