我在广播组中使用自定义ListView，其中包含2个TextView和4个RadioButtons。当我选择RadioButton时，我想显示该无线电组不可见，并且回答TextView变得可见。它的工作完美但问题是当我向下滚动并再次向上滚动时，无线电组本身就可见了。
class CustomAdapter extends ArrayAdapter<String> {
public CustomAdapter(Context context, int resource, int textViewResourceId, ArrayList<String> objects) {
super(context, resource, textViewResourceId, objects);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View v = inflater.inflate(R.layout.row, parent, false);
TextView mcqsText = (TextView) v.findViewById(R.id.mcqsText);
final TextView ans2 = (TextView) v.findViewById(R.id.answer2);
final TextView anss = (TextView) v.findViewById(R.id.answer);
final RadioGroup rg = (RadioGroup) v.findViewById(R.id.radioGroup);
RadioButton opt1 = (RadioButton) v.findViewById(R.id.optA);
RadioButton opt2 = (RadioButton) v.findViewById(R.id.optB);
RadioButton opt3 = (RadioButton) v.findViewById(R.id.optC);
RadioButton opt4 = (RadioButton) v.findViewById(R.id.optD);
final ImageView ivcorrect= (ImageView) v.findViewById(R.id.ivcorrect);
final ImageView ivwrong= (ImageView) v.findViewById(R.id.ivwrong);
mcqsText.setText(mcqs.get(position));
opt1.setText(optA.get(position));
opt2.setText(optB.get(position));
opt3.setText(optC.get(position));
opt4.setText(optD.get(position));
anss.setText(ans.get(position));
ans2.setText("Correct answer is = "+ans.get(position));
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
int radioButtonID = group.getCheckedRadioButtonId();
View radioButton = group.findViewById(radioButtonID);
//find radiobutton position
int position = group.indexOfChild(radioButton);
RadioButton btn = (RadioButton) rg.getChildAt(position);
String selection = (String) btn.getText();
if (selection.equals(anss.getText().toString())) {
rg.setVisibility(View.GONE);
ans2.setVisibility(View.VISIBLE);
ivcorrect.setVisibility(View.VISIBLE);
correct++;
} else {
ivwrong.setVisibility(View.VISIBLE);
ans2.setVisibility(View.VISIBLE);
wrong++;
}
}
});
return v;
}
}
答案 0 :(得分：1)
这是我的解决方案
public class CurrentAffairs extends AppCompatActivity {
public static int correct, wrong, marks;
DbH db;
ArrayList<Question> mcqs;
Cursor cur;
ListView lv;
CustomAdapter c;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.current_affairs);
lv = (ListView) findViewById(R.id.lv);
mcqs = new ArrayList<>();
try {
db = new DbH(this);
} catch (IOException e2) {
e2.printStackTrace();
}
try {
db.createdatabase();
} catch (IOException e) {
e.printStackTrace();
}
db.opendatabase();
cur = db.data();
try {
while (cur.moveToNext()) {
String mcqss = cur.getString(1);
String opta = cur.getString(2);
String optb = cur.getString(3);
String optc = cur.getString(4);
String optd = cur.getString(5);
String answ = cur.getString(6);
Question question = new Question();
question.question = mcqss;
question.option1 = opta;
question.option2 = optb;
question.option3 = optc;
question.option4 = optd;
question.correctanxer = answ;
mcqs.add(question);
c = new CustomAdapter(CurrentAffairs.this, R.layout.row, R.id.mcqsText, mcqs);
lv.setAdapter(c);
}
} finally {
cur.close();
}
Button btnshow = (Button) findViewById(R.id.btnshowresult);
btnshow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
StringBuffer sb = new StringBuffer();
sb.append("Correct Answer = " + " " + correct);
sb.append(" " + "Wrong Answer = " + " " + wrong);
sb.append(" " + "Final Score = " + " " + correct * 5);
Toast.makeText(CurrentAffairs.this, sb, Toast.LENGTH_SHORT).show();
}
});
}
class CustomAdapter extends ArrayAdapter<Question> {
public CustomAdapter(Context context, int resource, int textViewResourceId, ArrayList<Question> objects) {
super(context, resource, textViewResourceId, objects);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.row, parent, false);
TextView mcqsText = (TextView) v.findViewById(R.id.mcqsText);
TextView ans2 = (TextView) v.findViewById(R.id.answer2);
TextView anss = (TextView) v.findViewById(R.id.answer);
RadioGroup rg = (RadioGroup) v.findViewById(R.id.radioGroup);
RadioButton opt1 = (RadioButton) v.findViewById(R.id.optA);
RadioButton opt2 = (RadioButton) v.findViewById(R.id.optB);
RadioButton opt3 = (RadioButton) v.findViewById(R.id.optC);
RadioButton opt4 = (RadioButton) v.findViewById(R.id.optD);
Question question = mcqs.get(position);
mcqsText.setText(question.question);
opt1.setText(question.option1);
opt2.setText(question.option2);
opt3.setText(question.option3);
opt4.setText(question.option4);
anss.setText(question.selectedanxer);
ans2.setText("Correct answer is = " + question.correctanxer);
String test=opt1.getText().toString();
String test2=question.selectedanxer+"";
if (test.equals(""+test2)){
opt1.setChecked(true);
}
if (test2.equals(opt2.getText()+"")){
opt2.setChecked(true);
}
if (test2.equals(opt3.getText()+"")){
opt3.setChecked(true);
}
if (test2.equals(opt4.getText()+"")){
opt4.setChecked(true);
}
rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
Question question1=mcqs.get(position);
RadioButton radioButton= (RadioButton) group.findViewById(checkedId);
mcqs.get(position).selectedanxer=radioButton.getText().toString();
notifyDataSetChanged();
}
});
return v;
}
}
public class Question {
String question;
String option1;
String option2;
String option3;
String option4;
String selectedanxer;
String correctanxer;
}
}
答案 1 :(得分：0)
在你的类中添加一个int []'checked'数组，
int[] checked;
public CustomAdapter(Context context, int resource, int textViewResourceId, ArrayList<String> objects) {
super(context, resource, textViewResourceId, objects);
checked = new int[objects.size()];
for(int curInt : checked)
curInt = -1; // -1 as a flag, that none is checked yet for this item.
}
-
switch(checked[position]){
case 0:
//check your first radiobutton
opt1.setChecked(true);
rg.setVisibility(View.GONE);
break;
case 1:
//check your second radiobutton
opt2.setChecked(true);
rg.setVisibility(View.GONE);
break;
case 2:
//check your second radiobutton
opt3.setChecked(true);
rg.setVisibility(View.GONE);
break;
case 3:
//check your second radiobutton
opt4.setChecked(true);
rg.setVisibility(View.GONE);
break;
default:
break;
}
在onCheckedChanged监听器中，你检查每次选择哪个并更新'checked'数组 -
switch(checkedId){
case R.id.optA:
checked[position] = 0;
break;
case R.id.optB:
checked[position] = 1;
break;
case R.id.optC:
checked[position] = 2;
break;
case R.id.optD:
checked[position] = 3;
break;
}
我希望它有所帮助：）
答案 2 :(得分：0)
我有同样的问题。 但是我使用下面的代码（所有代码都在我的ListView Adaptor中）解决了： 我定义了一个保存选择的ArrayList：
selectedAnswers = new ArrayList<>();
然后，我将我的RadioButton的侦听器保存在ArrayList中：
RadioButton1.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked)
selectedAnswers.set( i, "0" );
}
} );
最后，我定义了一个在返回布局之前调用的方法
然后我将职位发送给该方法：
private void My_method(int i) {
for (int j=0;j<=selectedAnswers.size();j++)
{
if (i == j) {
int a = Integer.parseInt( selectedAnswers.get( i ).trim() );
((RadioButton) rg.getChildAt( a )).setChecked( true );
}
}
}
答案 3 :(得分：0)
您的列表视图应如下所示：
public class QuestionListAdaptor extends BaseAdapter {
public static int count1;
Context mContext;
public static ArrayList<String> selectedAnswers;
RadioGroup Radiogroup ;
public QuestionListAdaptor(Context mContext) {
this.mContext = mContext;
selectedAnswers = new ArrayList<>();
for (int i = 0; i < count1; i++) {
selectedAnswers.add( "4" );
}
}
@Override
public int getCount() {
return names.length;
}
@Override
public Object getItem(int i) {
return names[i];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(final int i, View view, ViewGroup viewGroup) {
View row = LayoutInflater.from( mContext )
.inflate( R.layout.question_list_item, viewGroup, false );
RadioButton r1 = row.findViewById( R.id.RadioButton1 );
RadioButton r2 = row.findViewById( R.id.RadioButton2 );
RadioButton r3 = row.findViewById( R.id.RadioButton3 );
RadioButton r4 = row.findViewById( R.id.RadioButton4 );
r1.setText( "answer1 " );
r2.setText( "answer2 " );
r3.setText( "answer3 " );
r4.setText( "answer4 " );
Radiogroup = row.findViewById( R.id.ReadioButton1 );
r1.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked)
selectedAnswers.set( i, "0" );
}
} );
r2.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked)
selectedAnswers.set( i, "1" );
}
} );
r3.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
selectedAnswers.set( i, "2" );
}
}
} );
r4.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
selectedAnswers.set( i, "3" );
}
}
} );
method(i);
return row;
}
private void method(int i) {
for (int j=0;j<=selectedAnswers.size();j++)
{
if (i == j) {
int a = Integer.parseInt( selectedAnswers.get( i ).trim() );
((RadioButton) Radiogroup .getChildAt( a )).setChecked( true );
}
}
}
}
希望有帮助。