android - 如何使用android获取id onclick listview

Question

我正在处理 listview 示例，我想从 mysql 数据库 onclick selected listview 获取 tid。怎么做请帮助我，我在这方面工作了很长时间，但找不到任何解决方案。

ListTask Activity

public class ListTask extends Activity {

Task task_;
ListView listCollege;
ProgressBar proCollageList;

TextView GetTaskName;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_list_task);

    listCollege = (ListView)findViewById(R.id.tasklist);
    proCollageList = (ProgressBar)findViewById(R.id.proCollageList);
    GetTaskName = (TextView) findViewById(R.id.taskname);

    new GetHttpResponse(this).execute();
}
private class GetHttpResponse extends AsyncTask<Void, Void, Void>
{
    private Context context;
    String result;
    List<Task> Task_;
    public GetHttpResponse(Context context)
    {
        this.context = context;
    }

    @Override
    protected void onPreExecute()
    {
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground(Void... arg0)
    {
        HttpService httpService = new HttpService("http://192.168.0.103/GroupBuilder/GetListTask.php");
        try
        {
            httpService.ExecutePostRequest();

            if(httpService.getResponseCode() == 200)
            {
                result = httpService.getResponse();

                System.out.println("Result       . . . "+result);

                Log.d("Result", result);
                if(result != null)
                {
                    JSONArray jsonArray = null;
                    try {
                        jsonArray = new JSONArray(result);

                        JSONObject object;
                        JSONArray array;
                        // cources college;
                        Task_ = new ArrayList<Task>();
                        for(int i=0; i<jsonArray.length(); i++)
                        {
                            task_ = new Task();
                            object = jsonArray.getJSONObject(i);

                            task_.taskname = object.getString("taskname");
                            task_.tid = object.getString("tid");

                            System.out.println("Taask Tid  "+task_.tid);
                            Task_.add(task_);
                        }
                    }
                    catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
            else
            {
                Toast.makeText(context, httpService.getErrorMessage(), Toast.LENGTH_SHORT).show();
            }
        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

列表适配器类

public class ListTaskAdapter extends BaseAdapter {

Context context;
List<Task> taskList;
Task task_;

public ListTaskAdapter(List<Task> listValue, Context context)
{
    this.context = context;
    this.taskList = listValue;
}

@Override
public int getCount() {
    return this.taskList.size();
}

@Override
public Object getItem(int position) {
    return this.taskList.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(final int position, View convertView, final ViewGroup viewGroup) {

    ViewTaskName viewtaskname = null;
    if(convertView == null)
    {
        viewtaskname = new ViewTaskName();
        LayoutInflater layoutInfiater = (LayoutInflater)this.context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        //LayoutInflater layoutInfiater = LayoutInflater.from(context);
        convertView = layoutInfiater.inflate(R.layout.listtaskadapter, null);

        viewtaskname.task_name = (TextView)convertView.findViewById(R.id.taskname);

        final String str = viewtaskname.task_name.getText().toString();
        convertView.setTag(viewtaskname);
    }
    else
    {
        viewtaskname = (ViewTaskName) convertView.getTag();
    }

    viewtaskname.task_name.setText(taskList.get(position).taskname);
    return convertView;
}
    }
class ViewTaskName
    {
TextView task_name;
    }


class Task{
public String taskname;
public String tid;
}

activity_list_task.xml代码

<ListView
    android:id="@+id/tasklist"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:visibility="visible"
    android:background="#38a2ed"
    android:layout_marginTop="35dp" >
</ListView>

listadaper代码

 <TextView
    android:id="@+id/taskname"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="10dp"
    android:text="TaskName"
    android:textColor="#000000"
    android:textSize="18sp"
    />

我没有得到任何解决方案，请帮助我并更新我的代码，谢谢

Answer 1

你应该使用 setOnItemClickListener

Register a callback to be invoked when an item in this AdapterView has been clicked.

创建一个 TextView，其中包含 Name 之类的 ID。

<TextView
android:id="@+id/taskID"
android:layout_width="0dp"
android:layout_height="0dp"

/>

然后

 listCollege.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() 
  {
    @Override
    public void onItemClick(AdapterView<?> parent, View view,int position, long id) 
    {
         TextView taskIDOBJ=(TextView)view.findViewById(R.id.taskID);
        String item = tasknameOBJ.getText().toString();
        Toast.makeText(this,"You selected : " + item,Toast.LENGTH_SHORT).show();                
    }
});

简单的方法

 String str_ID = Task_.get(position).tid;

代码

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