如何获得id onclick listview使用android

Question

我正在使用listview的例子，我想从mysql数据库tid选择列表视图。如何做到这一点请帮助我，我很长时间的工作，但无法找到任何解决方案。

ListTask活动

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; 
    } 

ListAdapter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，请帮我更新我的代码，感谢

Answer 1

您应该使用​​3210

注册一个回调来调用这个适配器视图的项目已被点击 时。

创建一个TextView，其中包含名称等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();     
    } 
}); 

简单的方式

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();     
    } 
}); 

Answer 2

试试这个

//declare global use this array list in AsyncTask response to add 
List<Tast> taskList = new ArrayList<>(); 


    listCollege.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
       @Override 
       public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
        String tid = taskList.get(position).tid; 
       } 
      }); 

Answer 3

使用setOnItemClickListener方法，并从sqllite ID，这种方法给你一个位置，在你从bean类有你的ID位置的基础。请点击此链接。

Get Id from database in a listview onclick

Answer 4

view.setTag(id); 
view.getTag();