Question

点击listitem时获取listview item时遇到问题。我listview item（Arrayadapter）获得simple listview，但我遇到custom listview的问题。

我正在使用

listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> myAdapter, View myView, int pos, long mylng) {

  //String  selectedFromList = (String) listview.getItemAtPosition(pos);
   String  selectedFromList = (String) adapter.getItem(pos);

    System.out.println("selected value >> >> >> >> >> >>"+selectedFromList);

    SelectedAnswer.setAnswer(selectedFromList);

              }

          });

进入Logcat，给我null值：

I/System.out( 1238): selected value >> >> >> >> >> >>null

main.class

 protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.quiz_questions);

        listview = (ListView) findViewById(R.id.questions_list);

        GoToNextQuestion();
  }

private void GoToNextQuestion() {
    // TODO Auto-generated method stub

     currentGame = ((Quizapplication)getApplication()).getCurrentGame();
    currentQ = currentGame.getNextQuestion();

       setQuestions();

    listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> myAdapter, View myView, int pos, long mylng) {

  //String  selectedFromList = (String) listview.getItemAtPosition(pos);
   String  selectedFromList = (String) adapter.getItem(pos);

    System.out.println("selected value >> >> >> >> >> >>"+selectedFromList);

    SelectedAnswer.setAnswer(selectedFromList);

              }

          });


}

 private void setQuestions() {


    // set the available options
    List<String> answers = currentQ.getQuestionOptions();
    System.out.println("value of the options >>>>>>>>>>>>>:"+answers); 


     //ArrayAdapter< String> myadapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_single_choice ,answers);

    //ArrayAdapter< String> adapter = new ArrayAdapter<String>(this, R.layout.quiz_questions_listitem, answers);        

             // working for the simple adapter

      adapter = new ListviewAdapter(this,answers);

     listview.setAdapter(adapter);
     //listview.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
}


 }

修改

 public class ListviewAdapter extends BaseAdapter{

public List<String> Questions;  

public Activity context;  
public LayoutInflater inflater;


public ListviewAdapter(Activity context,List<String> answers) {  
    super();  

    this.context = context;  
    this.Questions = answers;  

    this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);  
}  

@Override  
public int getCount() {  
    // TODO Auto-generated method stub  
    return Questions.size();  
}  

@Override  
public Object getItem(int position) {  
    // TODO Auto-generated method stub  
    return null;  
}  

@Override  
public long getItemId(int position) {  
    // TODO Auto-generated method stub  
    return 0;  
}  

public static class ViewHolder  
{  

    TextView txtquestion;  
}  

@Override  
public View getView(int position, View convertView, ViewGroup parent) {  
    // TODO Auto-generated method stub  

    ViewHolder holder;  
    if(convertView==null)  
    {  
        holder = new ViewHolder();  
        convertView = inflater.inflate(R.layout.quiz_questions_listitem, null);  


        holder.txtquestion = (TextView) convertView.findViewById(R.id.textView_option);  

        convertView.setTag(holder);  

      /*  convertView.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                 System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>"+v.toString());
                notifyDataSetChanged();

                 SelectedAnswer.setAnswer(v.toString());
            }
        });*/
    }  
    else  
        holder=(ViewHolder)convertView.getTag();  

    holder.txtquestion.setText(Questions.get(position));  

    return convertView;  
}   

}

Answer 1

您可能从自定义适配器的null方法返回getItem() ListviewAdapter（您应该添加适配器的代码）。此外，无需再次在ListView上设置侦听器。

像这样修改getItem()方法：

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

Answer 2

尝试为您的列表执行此操作：

list.setItemsCanFocus(false);

并确保列表中的项目具有属性

android:focusable="false"
android:focusableInTouchMode="false"

Answer 3

您可以选择错误的适配器，试试这个

String  selectedFromList =  myAdapter.getItemAtPosition(pos).toString();

Answer 4

使用此

   public void onItemClick(AdapterView<?> myAdapter, View myView, int pos, long mylng) {


   String  selectedFromList = myAdapter.getItemAtPosition(pos);

  System.out.println("selected value >> >> >> >> >> >>"+selectedFromList);

  SelectedAnswer.setAnswer(selectedFromList);

          }

      });

Answer 5

尝试这样做。

public void onItemClick(AdapterView<?> myAdapter, View myView, int pos, long mylng) {

  //String  selectedFromList = (String) listview.getItemAtPosition(pos);

   ListviewAdapter adapter=(ListviewAdapter) listview.getAdapter();
   String  selectedFromList = (String) adapter.getItem(pos);

    System.out.println("selected value >> >> >> >> >> >>"+selectedFromList);

    SelectedAnswer.setAnswer(selectedFromList);

              }

          });

Listview setOnItemClickListener - 不适用于自定义列表视图，但使用简单列表视图

5 个答案: