单选按钮被取消并在列表视图滚动中自动检查 [英] Radio Button gets uncked and automatically checked in listview scrolling
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问题描述
我有一个程序，其中我有多个问题和2个选项（radiobuttons）当我检查1并滚动listview它未被检查。我会发布整个代码，请帮我解决。我认为适配器类有问题
i have a program in which i have multiple questions and 2 options (radiobuttons) when i check 1 and scroll listview it gets unchecked. i will post the whole code kindly fix it for me. I think its something wrong with adapter class
MainActivity
MainActivity
public class MainActivity extends AppCompatActivity {
ListView simpleList;
String[] questions;
Button submit;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get the string array from string.xml file
questions = getResources().getStringArray(R.array.questions);
// get the reference of ListView and Button
simpleList = (ListView) findViewById(R.id.simpleListView);
submit = (Button) findViewById(R.id.submit);
// set the adapter to fill the data in the ListView
CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), questions);
simpleList.setAdapter(customAdapter);
// perform setOnClickListerner event on Button
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String message = "";
// get the value of selected answers from custom adapter
for (int i = 0; i < CustomAdapter.selectedAnswers.size(); i++) {
message = message + "\n" + (i + 1) + " " + CustomAdapter.selectedAnswers.get(i);
}
// display the message on screen with the help of Toast.
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
}
});
}
自定义适配器
Custom Adapter
public class Questions_Adapter extends BaseAdapter {
Activity context;
String[] questionsList;
String age_range;
LayoutInflater inflter;
public static ArrayList<Integer> selectedAnswers;
public Questions_Adapter(Activity applicationContext, String[] questionsList, String age_range) {
context = applicationContext;
this.questionsList = questionsList;
this.age_range = age_range;
// initialize arraylist and add string for all the questions
selectedAnswers = new ArrayList<>();
for (int i = 0; i < questionsList.length; i++) {
selectedAnswers.add(0);
}
inflter = (LayoutInflater.from(applicationContext));
}
@Override
public int getCount() {
return questionsList.length;
}
@Override
public Object getItem(int i) {
return null;
}
@Override
public long getItemId(int i) {
return 0;
}
private class Viewholder{
TextView question;
RadioButton op1, op2, op3, op4, op5, op6;
}
@Override
public View getView(final int position, View view, ViewGroup viewGroup) {
Viewholder viewholder;
LayoutInflater inflater = context.getLayoutInflater();
if (view == null){
viewholder = new Viewholder();
view = inflater.inflate(R.layout.list_items,null);
viewholder.question = (TextView) view.findViewById(R.id.question);
viewholder.op1 = (RadioButton) view.findViewById(R.id.yes);
viewholder.op2 = (RadioButton) view.findViewById(R.id.no);
viewholder.op3 = (RadioButton) view.findViewById(R.id.op);
viewholder.op4 = (RadioButton) view.findViewById(R.id.op4);
viewholder.op5 = (RadioButton) view.findViewById(R.id.op5);
viewholder.op6 = (RadioButton) view.findViewById(R.id.op6);
view.setTag(viewholder);
}
else {
viewholder = (Viewholder) view.getTag();
}
// perform setOnCheckedChangeListener event on yes button
viewholder.op1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// set Yes values in ArrayList if RadioButton is checked
if (isChecked)
selectedAnswers.set(position, 1);
}
});
viewholder.op2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked)
selectedAnswers.set(position, 2);
}
});
viewholder.op3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked)
selectedAnswers.set(position, 3);
}
});
viewholder.op4.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked)
selectedAnswers.set(position, 4);
}
});
viewholder.op5.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked)
selectedAnswers.set(position, 10);
}
});
viewholder.op6.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked)
selectedAnswers.set(position, 0);
}
});
// set the value in TextView
viewholder.op1.setText("None or Little of a time");
viewholder.op2.setText("Some of the time");
viewholder.op3.setText("A good part of the time");
viewholder.op4.setText("Most or All of the time");
viewholder.op5.setText("Yes");
viewholder.op6.setText("No");
viewholder.question.setText(questionsList[position]);
if(age_range.equals("ZSDS")){
viewholder.op5.setVisibility(View.GONE);
viewholder.op6.setVisibility(View.GONE);
}
if(age_range.equals("GDS")){
viewholder.op1.setVisibility(View.GONE);
viewholder.op2.setVisibility(View.GONE);
viewholder.op3.setVisibility(View.GONE);
viewholder.op4.setVisibility(View.GONE);
}
return view;
}
}
推荐答案
首先您需要在模型中保存勾选（复选框选择），例如isSelected = true&调用 notifyDataSetChanged 。然后在getView（）方法中你需要检查这个标志并根据它设置复选框状态。
First of all you need to save the tick(checkbox selection) in your model, say isSelected = true & call notifyDataSetChanged. and then inside getView() method u need to check for this flag and set checkbox state based on that.
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