Java 更新listView中的一行，每四行更新一次

我想更新一个listview项目，它可以正常工作，直到我向下滚动到不可见的项目，并且似乎有一个项目（不可见）也得到更新（我向下滚动时看到）

上图描述了这个问题，当我更新位置0的listview项目时，位置5的项目（在我滚动之前不可见）也会更新（应该不会），如果我对pos 1执行相同操作，那么pos 6也会更新，依此类推，反之亦然，例如：当我更新pos 7并向上滚动时，pos 2也会更新，如何防止这种情况发生，并且只让listview更新我单击的项目（而不更新在滚动之前不可见的listview项目）

试试这个：

AnsweredQuestion.java：

public class AnsweredQuestion {
int selectedAnswerViewId;
int correctAnswerViewId;

public AnsweredQuestion(int selectedAnswerViewId, int correctAnswerViewId) {
    this.selectedAnswerViewId = selectedAnswerViewId;
    this.correctAnswerViewId = correctAnswerViewId;
}
}

TestActivity.java：

public class TestActivity extends ListActivity {

private SQLiteDatabase db;
private Cursor cursor;
private int correctAnswers;
private int incorrectAnswers;

private ArrayList<Integer> answeredQuestions = new ArrayList<>();
private HashMap<Integer, AnsweredQuestion> answeredQuestionHashMap = new HashMap<>();

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    correctAnswers = 0;
    incorrectAnswers = 0;

    try{
        DingDongDatabaseHelper coffeinaDatabaseHelper = new DingDongDatabaseHelper(this);
        db = coffeinaDatabaseHelper.getReadableDatabase();
        cursor = db.query("BPIE", new String[]{"_id", "QUESTION", "ANSWER1", "ANSWER2", "ANSWER3", "ANSWER4", "CORRECT"},null, null, null, null,null);
        Random rand = new Random();
        CursorAdapter listAdapter = new SimpleCursorAdapter(this, R.layout.test_adapter, cursor, new String[]{ "QUESTION", "ANSWER1", "ANSWER2", "ANSWER3", "ANSWER4"}, new int[]{R.id.text_test_question, R.id.radio_answer1, R.id.radio_answer2, R.id.radio_answer3, R.id.radio_answer4}, 0){
            @Override
            public void bindView(View view, Context context, Cursor cursor) {
                super.bindView(view, context, cursor);
                int position = cursor.getPosition();
                RadioButton radio1 = (RadioButton)view.findViewById(R.id.radio_answer1);
                RadioButton radio2 = (RadioButton)view.findViewById(R.id.radio_answer2);
                RadioButton radio3 = (RadioButton)view.findViewById(R.id.radio_answer3);
                RadioButton radio4 = (RadioButton)view.findViewById(R.id.radio_answer4);
                radio1.setBackgroundColor(Color.WHITE);
                radio2.setBackgroundColor(Color.WHITE);
                radio3.setBackgroundColor(Color.WHITE);
                radio4.setBackgroundColor(Color.WHITE);
                if(answeredQuestions.contains(position)){
                    AnsweredQuestion answeredQuestion = answeredQuestionHashMap.get(position);
                    RadioButton selectedAnswer = view.findViewById(answeredQuestion.selectedAnswerViewId);
                    RadioButton correctAnswer = view.findViewById(answeredQuestion.correctAnswerViewId);
                    selectedAnswer.setBackgroundColor(Color.RED);
                    correctAnswer.setBackgroundColor(Color.GREEN);
                }
            }
        };

        setListAdapter(listAdapter);

    }catch(SQLException e){
        Toast toast = Toast.makeText(this, "Błąd",Toast.LENGTH_SHORT);
        toast.show();
    }

}

protected void onListItemClick(ListView l, View item, int position, long id) {

    RadioButton radio1 = (RadioButton)item.findViewById(R.id.radio_answer1);
    RadioButton radio2 = (RadioButton)item.findViewById(R.id.radio_answer2);
    RadioButton radio3 = (RadioButton)item.findViewById(R.id.radio_answer3);
    RadioButton radio4 = (RadioButton)item.findViewById(R.id.radio_answer4);
    radio1.setBackgroundColor(Color.WHITE);
    radio2.setBackgroundColor(Color.WHITE);
    radio3.setBackgroundColor(Color.WHITE);
    radio4.setBackgroundColor(Color.WHITE);

    String correctAnswer="";
    String selectedAnswer="";
    if(item != null){
        RadioGroup radioGroup = (RadioGroup)item.findViewById(R.id.radio_group);
        RadioButton selectedButton = (RadioButton)item.findViewById(radioGroup.getCheckedRadioButtonId());
        RadioButton correctButton = null;

        if(selectedButton!=null){
            if(cursor.moveToPosition(position)) {
                correctAnswer = cursor.getString(6);
            }
            selectedAnswer = String.valueOf(selectedButton.getText());

            if(correctAnswer.equals(selectedAnswer)){
                selectedButton.setBackgroundColor(Color.GREEN);
                correctAnswers++;
                correctButton = selectedButton;
            }
            else
            {
                incorrectAnswers++;
                selectedButton.setBackgroundColor(Color.RED);

                if(correctAnswer.equals(radio1.getText())) correctButton = radio1;
                else if(correctAnswer.equals(radio2.getText())) correctButton = radio2;
                else if(correctAnswer.equals(radio3.getText())) correctButton = radio3;
                else if(correctAnswer.equals(radio4.getText())) correctButton = radio4;
                correctButton.setBackgroundColor(Color.GREEN);
            }
            Toast toast = Toast.makeText(TestActivity.this, "CORRECT: " + correctAnswer + "\nSELECTED: " + selectedAnswer, Toast.LENGTH_LONG);
            toast.show();

            if(!answeredQuestions.contains(position)) answeredQuestions.add(position);
            AnsweredQuestion answeredQuestion = new AnsweredQuestion(selectedButton.getId(), correctButton.getId());
            answeredQuestionHashMap.put(position, answeredQuestion);
        }
    }
}
}

公共类测试活动扩展了ListActivity{
专用数据库数据库；
私有游标；
私人回答；
私人int不正确答案；
private ArrayList answeredQuestions=new ArrayList（）；
private HashMap answeredQuestionHashMap=新HashMap（）；
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
正确答案=0；
不正确答案=0；
试一试{
DingDongDatabaseHelper CoffeinadaDatabaseHelper=新的DingDongDatabaseHelper（此）；
db=coffeinadadatabasehelper.getReadableDatabase（）；
cursor=db.query（“BPIE”，新字符串[]{“\u id”，“QUESTION”，“ANSWER1”，“ANSWER2”，“ANSWER3”，“ANSWER4”，“CORRECT”}，null，null，null，null）；
Random rand=新的Random（）；
CursorAdapter listAdapter=新的SimpleCorsorAdapter（这个，R.layout.test_适配器，光标，新字符串[]{“问题”，“回答1”，“回答2”，“回答3”，“回答4”}，新int[]{R.id.text_测试_问题，R.id.radio_回答1，R.id.radio_回答2，R.id.radio_回答3，R.id.radio_回答4}，0）{
@凌驾
公共void bindView（视图、上下文上下文、光标）{
super.bindView（视图、上下文、光标）；
int position=cursor.getPosition（）；
RadioButton radio1=（RadioButton）视图.findViewById（R.id.radio\u answer1）；
RadioButton radio2=（RadioButton）视图.findViewById（R.id.radio\u answer2）；
RadioButton radio3=（RadioButton）视图.findViewById（R.id.radio\u answer3）；
RadioButton radio4=（RadioButton）视图.findViewById（R.id.radio\u answer4）；
radio1.setBackgroundColor（颜色：白色）；
radio2.setBackgroundColor（颜色：白色）；
radio3.setBackgroundColor（颜色：白色）；
收音机4.背景色（颜色：白色）；
如果（回答问题。包含（位置））{
AnsweredQuestion AnsweredQuestion=answeredQuestionHashMap.get（位置）；
单选按钮selectedAnswer=view.findViewById（answeredQuestion.selectedAnswerViewId）；
RadioButton correctAnswer=view.findViewById（answeredQuestion.correctAnswerViewId）；
选择回答。挫折背景颜色（颜色。红色）；
回答正确。挫折背景颜色（颜色。绿色）；
}
}
};
setListAdapter（listAdapter）；
}捕获（SQLE异常）{
Toast Toast=Toast.makeText（这是“Błd”，Toast.LENGTHąu SHORT）；
toast.show（）；
}
}
受保护的void onListItemClick（列表视图l、视图项、int位置、长id）{
RadioButton radio1=（RadioButton）项。findViewById（R.id.radio\u answer1）；
RadioButton radio2=（RadioButton）项。findViewById（R.id.radio\u answer2）；
RadioButton radio3=（RadioButton）项。findViewById（R.id.radio\u answer3）；
RadioButton radio4=（RadioButton）项。findViewById（R.id.radio\u answer4）；
radio1.setBackgroundColor（颜色：白色）；
radio2.setBackgroundColor（颜色：白色）；
radio3.setBackgroundColor（颜色：白色）；
收音机4.背景色（颜色：白色）；
字符串correctAnswer=“”；
字符串selectedAnswer=“”；
如果（项！=null）{
放射组放射组=（放射组）项。findViewById（R.id.radio\U组）；
RadioButton selectedButton=（RadioButton）项。findViewById（radioGroup.getCheckedRadioButtonId（））；
RadioButton correctButton=null；
如果（selectedButton！=null）{
if（光标移动位置（位置））{
correctAnswer=cursor.getString（6）；
}
selectedAnswer=String.valueOf（selectedButton.getText（））；
如果（正确答案等于（选择回答））{
selectedButton.setBackgroundColor（颜色.绿色）；
正确答案++；
correctButton=selectedButton；
}
其他的
{
不正确的回答++；
selectedButton.setBackgroundColor（颜色：红色）；
如果（correctAnswer.equals（radio1.getText（）））correctButton=radio1；
如果（correctAnswer.equals（radio2.getText（）））correctButton=radio2；
如果（correctAnswer.equals（radio3.getText（）））correctButton=radio3；
如果（correctAnswer.equals（radio4.getText（）））correctButton=radio4；
correctButton.setBackgroundColor（颜色.绿色）；
}
Toast Toast=Toast.makeText（TestActivity.this，“CORRECT:+correctAnswer+”\n选择：+selectedAnswer，Toast.LENGTH\u LONG）；
toast.show（）；
如果（！answeredQuestions.contains（position））answeredQuestions.add（position）；
AnsweredQuestion AnsweredQuestion=新的回答问题（selectedButton.getId（），correctButton.getId（））；
回答问题hashmap.put（位置，回答问题）；
}
}
}
}

---

希望有帮助

post

SimpleCursorAdapter

code这是在类中生成的这可能是因为某些视图被自动重用，并且它们的状态被保留。要控制重用视图的行为，我想您需要设置一个Si

public class TestActivity extends ListActivity {

private SQLiteDatabase db;
private Cursor cursor;
private int correctAnswers;
private int incorrectAnswers;

private ArrayList<Integer> answeredQuestions = new ArrayList<>();
private HashMap<Integer, AnsweredQuestion> answeredQuestionHashMap = new HashMap<>();

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    correctAnswers = 0;
    incorrectAnswers = 0;

    try{
        DingDongDatabaseHelper coffeinaDatabaseHelper = new DingDongDatabaseHelper(this);
        db = coffeinaDatabaseHelper.getReadableDatabase();
        cursor = db.query("BPIE", new String[]{"_id", "QUESTION", "ANSWER1", "ANSWER2", "ANSWER3", "ANSWER4", "CORRECT"},null, null, null, null,null);
        Random rand = new Random();
        CursorAdapter listAdapter = new SimpleCursorAdapter(this, R.layout.test_adapter, cursor, new String[]{ "QUESTION", "ANSWER1", "ANSWER2", "ANSWER3", "ANSWER4"}, new int[]{R.id.text_test_question, R.id.radio_answer1, R.id.radio_answer2, R.id.radio_answer3, R.id.radio_answer4}, 0){
            @Override
            public void bindView(View view, Context context, Cursor cursor) {
                super.bindView(view, context, cursor);
                int position = cursor.getPosition();
                RadioButton radio1 = (RadioButton)view.findViewById(R.id.radio_answer1);
                RadioButton radio2 = (RadioButton)view.findViewById(R.id.radio_answer2);
                RadioButton radio3 = (RadioButton)view.findViewById(R.id.radio_answer3);
                RadioButton radio4 = (RadioButton)view.findViewById(R.id.radio_answer4);
                radio1.setBackgroundColor(Color.WHITE);
                radio2.setBackgroundColor(Color.WHITE);
                radio3.setBackgroundColor(Color.WHITE);
                radio4.setBackgroundColor(Color.WHITE);
                if(answeredQuestions.contains(position)){
                    AnsweredQuestion answeredQuestion = answeredQuestionHashMap.get(position);
                    RadioButton selectedAnswer = view.findViewById(answeredQuestion.selectedAnswerViewId);
                    RadioButton correctAnswer = view.findViewById(answeredQuestion.correctAnswerViewId);
                    selectedAnswer.setBackgroundColor(Color.RED);
                    correctAnswer.setBackgroundColor(Color.GREEN);
                }
            }
        };

        setListAdapter(listAdapter);

    }catch(SQLException e){
        Toast toast = Toast.makeText(this, "Błąd",Toast.LENGTH_SHORT);
        toast.show();
    }

}

protected void onListItemClick(ListView l, View item, int position, long id) {

    RadioButton radio1 = (RadioButton)item.findViewById(R.id.radio_answer1);
    RadioButton radio2 = (RadioButton)item.findViewById(R.id.radio_answer2);
    RadioButton radio3 = (RadioButton)item.findViewById(R.id.radio_answer3);
    RadioButton radio4 = (RadioButton)item.findViewById(R.id.radio_answer4);
    radio1.setBackgroundColor(Color.WHITE);
    radio2.setBackgroundColor(Color.WHITE);
    radio3.setBackgroundColor(Color.WHITE);
    radio4.setBackgroundColor(Color.WHITE);

    String correctAnswer="";
    String selectedAnswer="";
    if(item != null){
        RadioGroup radioGroup = (RadioGroup)item.findViewById(R.id.radio_group);
        RadioButton selectedButton = (RadioButton)item.findViewById(radioGroup.getCheckedRadioButtonId());
        RadioButton correctButton = null;

        if(selectedButton!=null){
            if(cursor.moveToPosition(position)) {
                correctAnswer = cursor.getString(6);
            }
            selectedAnswer = String.valueOf(selectedButton.getText());

            if(correctAnswer.equals(selectedAnswer)){
                selectedButton.setBackgroundColor(Color.GREEN);
                correctAnswers++;
                correctButton = selectedButton;
            }
            else
            {
                incorrectAnswers++;
                selectedButton.setBackgroundColor(Color.RED);

                if(correctAnswer.equals(radio1.getText())) correctButton = radio1;
                else if(correctAnswer.equals(radio2.getText())) correctButton = radio2;
                else if(correctAnswer.equals(radio3.getText())) correctButton = radio3;
                else if(correctAnswer.equals(radio4.getText())) correctButton = radio4;
                correctButton.setBackgroundColor(Color.GREEN);
            }
            Toast toast = Toast.makeText(TestActivity.this, "CORRECT: " + correctAnswer + "\nSELECTED: " + selectedAnswer, Toast.LENGTH_LONG);
            toast.show();

            if(!answeredQuestions.contains(position)) answeredQuestions.add(position);
            AnsweredQuestion answeredQuestion = new AnsweredQuestion(selectedButton.getId(), correctButton.getId());
            answeredQuestionHashMap.put(position, answeredQuestion);
        }
    }
}
}