Ich arbeite an derquiz applicationDafür benutze ichlistview for the dispaly the answers options, Ich möchte die Hintergrundfarbe der Listenansicht ändern, wenn der Benutzer das Listenansicht-Element auswählt. Wenn die Antwort lautetcorrect dann setzen Sie diegreen background undwrong dann setzenred background

Ich versuche so viel, aber ich verstehe die Lösung nicht.

Adapterklasse

public class ListviewAdapter extends BaseAdapter{

public List<String> Questions;  

public Activity context;  
public LayoutInflater inflater;
private int[] colors = new int[] { 0x30505050, 0x30808080 };

private String[] opt_no;
public static View change_color;

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

    this.context = context;  
    this.Questions = answers; 
    this.opt_no = que_opt_no;

    //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 Questions.get(position);  
}  

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

public static class ViewHolder  
{  

    TextView txtquestion;  
    TextView txtquestion_no;  
}  

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

    ViewHolder holder; 

    LayoutInflater inflater = context.getLayoutInflater();
   // this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    String fontPath = "fonts/Face Your Fears.ttf";

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

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

       // holder.txtquestion .setTypeface(Typeface.createFromAsset(convertView.getContext().getAssets(),fontPath));

        convertView.setTag(holder);  

    }  
    else  
        holder=(ViewHolder)convertView.getTag(); 


   /* int colorPos = position % colors.length;
    convertView.setBackgroundColor(colors[colorPos]); */

    change_color = convertView;

   // convertView.setBackgroundResource(R.drawable.listview_background);


    holder.txtquestion.setText(Questions.get(position)); 
    holder.txtquestion_no.setText(opt_no[position]); 

    return convertView;  
}  

/*public static void setbackground(){

    String answer = SelectedAnswer.getAnswer();
       if (Display_questions.currentQ.getAnswer().trim().equals(answer.trim()))
    { 

          Toast.makeText(change_color.getContext(), "red",Toast.LENGTH_SHORT).show();
         change_color.setBackgroundResource(R.drawable.listview_background);
        //ListviewAdapter.change_color.setBackgroundResource(R.drawable.listview_background);
        //Display_questions.currentGame.incrementRightAnswers();
    }
    else{

        Toast.makeText(change_color.getContext(), "Blue",Toast.LENGTH_SHORT).show();
        change_color.setBackgroundResource(R.drawable.listview_false_background);
        //Display_questions.currentGame.incrementWrongAnswers();
    }
}*/

}

Java-Klasse

 public class Display_questions extends Activity{

 public static Question currentQ;
  public static GamePlay currentGame;
 ListView listview;

ListviewAdapter adapter;

String que_opt_no[] = {"a) ","b)","c) ","d) "};

@Override
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);
        listview.setItemsCanFocus(false);

        GoToNextQuestion();
}

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

    listview.setOnItemClickListener(new OnItemClickListener() {

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


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

                 SelectedAnswer.setAnswer(selectedFromList);

                 if (!checkAnswer(pos)) return;

                if (currentGame.isGameOver()){

                    Intent i = new Intent(Display_questions.this, Display_result.class);
                    i.putExtra("Timer_Value", TimerTime);
                    startActivity(i); 

                    finish();
                }
                else{

                    GoToNextQuestion();


                } 
            }
          });

     setQuestions();
  }

 private void setQuestions() {

    // set the question text from current question

    String question = currentQ.getQuestion().trim();
    TextView qText = (TextView) findViewById(R.id.txt_questions);
    qText.setText(question);


    // set the available options
    List<String> answers = currentQ.getQuestionOptions();

     adapter = new ListviewAdapter(this,answers,que_opt_no);

     listview.setAdapter(adapter);

}

 static boolean checkAnswer(int selectedPosition) {

    String answer = SelectedAnswer.getAnswer();

    if (answer==null){

        return false;
    }
    else {

         AnswerStates state = AnswerStates.NONE;

        if (currentQ.getAnswer().trim().equals(answer.trim()))
        { 

            //listview.setBackgroundResource(R.drawable.listview_background);

            currentGame.incrementRightAnswers();
            state = AnswerStates.RIGHT;

        }
        else{

            //ListviewAdapter.setbackground();
            currentGame.incrementWrongAnswers();
            state = AnswerStates.WRONG;

        }

        adapter.setSelectedAnswerState(selectedPosition, state);
        adapter.notifyDataSetChanged();

        return true;
    }
}

  }

Bearbeiten: check Meine Bilder: 1.) 2.)