选择一个RadioButton值并向后滚动以在RecyclerView中删除所选的一个 [英] Selecting one RadioButton value and scrolling back removing the selected one in RecyclerView
问题描述
在我的应用程序中,借助RecyclerView
显示20个多项选择题.
In my application am displaying 20 multiple choice questions with the help of RecyclerView
.
如果我更改第一个RadioGroup
的值并向下滚动,然后再次向上滚动以删除RecycelarView
中的选定值,并且我也想进一步使用该选定的RadioButton
值,则还检查了link1 ,但我不明白他在做什么.
If I change the value of first RadioGroup
and scrolls down, again scrolls up removing the selected value in RecycelarView
and also i want to use that selected RadioButton
value further, I was also checked link1 but i did't understood what he is doing.
这是我的示例代码片段,如果您需要任何澄清,请告诉我.
Here is my sample code snippet let me know if you need any clarification.
package com.testing.survey;
import java.util.List;
import android.annotation.SuppressLint;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
@SuppressWarnings("rawtypes")
public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> {
private List<Student> stList;
public DataAdapter(List<Student> students) {
this.stList = students;
}
// Create new views
@Override
public DataAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(
R.layout.list_row, null);
// create ViewHolder
ViewHolder viewHolder = new ViewHolder(itemLayoutView);
return viewHolder;
}
@SuppressLint("UseValueOf") @Override
public void onBindViewHolder(ViewHolder viewHolder,int position) {
final int pos = position;
viewHolder.tvQuestionNumber.setText(stList.get(position).getQuestionNumber());
viewHolder.tvQuestion.setText(stList.get(position).getQuestion());
viewHolder.rbAns1.setText(stList.get(position).getAnswer1());
viewHolder.rbAns2.setText(stList.get(position).getAnswer2());
viewHolder.rbAns3.setText(stList.get(position).getAnswer3());
viewHolder.rbAns4.setText(stList.get(position).getAnswer4());
viewHolder.rbAns5.setText(stList.get(position).getAnswer4());
//viewHolder.rgAnswers.clearCheck();
viewHolder.rgAnswers.check(stList.get(position).getSelectedRadioButtonId());
viewHolder.rgAnswers.setTag(new Integer(position));
Log.v("select"+position,stList.get(position).getSelectedRadioButtonId()+"");
viewHolder.rgAnswers.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
int radioButtonID = group.getCheckedRadioButtonId();
View radioButton = group.findViewById(radioButtonID);
int clickedPos = ((Integer)group.getTag()).intValue();
//Student contact=(Student)group.getTag();
//contact.setSelectedRadioButtonId(radioButtonID);
stList.get(clickedPos).setSelectedRadioButtonId(radioButtonID);
Log.v("hello"+clickedPos,stList.get(clickedPos).getSelectedRadioButtonId()+"");
}
});
}
// Return the size arraylist
@Override
public int getItemCount() {
return stList.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView tvQuestionNumber;
public TextView tvQuestion;
public RadioGroup rgAnswers;
public RadioButton rbAns1,rbAns2,rbAns3,rbAns4,rbAns5;
public Student singlestudent;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
tvQuestionNumber = (TextView) itemLayoutView.findViewById(R.id.tvQuestionNumber);
tvQuestion = (TextView) itemLayoutView.findViewById(R.id.tvQuestion);
rgAnswers=(RadioGroup)itemLayoutView.findViewById(R.id.rgAnswers);
rbAns1=(RadioButton)itemLayoutView.findViewById(R.id.rbAnswer1);
rbAns2=(RadioButton)itemLayoutView.findViewById(R.id.rbAnswer2);
rbAns3=(RadioButton)itemLayoutView.findViewById(R.id.rbAnswer3);
rbAns4=(RadioButton)itemLayoutView.findViewById(R.id.rbAnswer4);
rbAns5=(RadioButton)itemLayoutView.findViewById(R.id.rbAnswer5);
}
}
// method to access in activity after updating selection
public List<Student> getStudentist() {
return stList;
}
}
推荐答案
我创建了一个示例代码,该代码将根据您的要求工作.
I created a sample code that will work as per your req.
首先,我们必须按如下所示创建xml:
First we have to create the xml as follows :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerViewAppList"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</LinearLayout>
然后我们将创建如下界面
Then we will create an interface as follows
public interface OnOptionSelected {
public void onOptionSelected(int position,int itemSelected);
}
然后我们将创建模型类,如下所示:
Then we will create the model class as follows :
public class QuestionModel {
private String question;
private int seleectedAnswerPosition;
private boolean op1Sel,op2Sel,op3Sel; // options
public boolean isOp1Sel() {
return op1Sel;
}
public void setOp1Sel(boolean op1Sel) {
this.op1Sel = op1Sel;
if(op1Sel){ // To make sure only one option is selected at a time
setOp2Sel(false);
setOp3Sel(false);
}
}
public boolean isOp2Sel() {
return op2Sel;
}
public void setOp2Sel(boolean op2Sel) {
this.op2Sel = op2Sel;
if(op2Sel){
setOp1Sel(false);
setOp3Sel(false);
}
}
public boolean isOp3Sel() {
return op3Sel;
}
public void setOp3Sel(boolean op3Sel) {
this.op3Sel = op3Sel;
if(op3Sel){
setOp2Sel(false);
setOp1Sel(false);
}
}
public int getSeleectedAnswerPosition() {
return seleectedAnswerPosition;
}
public void setSeleectedAnswerPosition(int seleectedAnswerPosition) {
this.seleectedAnswerPosition = seleectedAnswerPosition;
}
public String getQuestion() {
return question;
}
public void setQuestion(String question) {
this.question = question;
}
}
然后我们将为row创建视图:
Then we will create the view for row :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/question"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<RadioButton
android:id="@+id/radoptionOne"
android:text="May Be"
android:checked="false"
android:saveEnabled="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<RadioButton
android:checked="false"
android:id="@+id/radoptionTwo"
android:text="NO"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<RadioButton
android:checked="false"
android:id="@+id/radoptionThree"
android:text="Yes"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
适配器类如下:
public class QuestionAdapter extends RecyclerView.Adapter<QuestionAdapter.ViewHolder> {
private List<QuestionModel> questionModels;
public void setOnOptionSelected(OnOptionSelected onOptionSelected) {
this.onOptionSelected = onOptionSelected;
}
private OnOptionSelected onOptionSelected;
public List<QuestionModel> getQuestionModels() {
return questionModels;
}
public void setQuestionModels(List<QuestionModel> questionModels) {
this.questionModels = questionModels;
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView question;
RadioGroup radioGroup;
RadioButton op1, op2, op3;
ViewHolder(View view) {
super(view);
question = (TextView) view.findViewById(R.id.question);
//radioGroup=(RadioGroup)view.findViewById(R.id.radGroup);
op1 = (RadioButton) view.findViewById(R.id.radoptionOne);
op2 = (RadioButton) view.findViewById(R.id.radoptionTwo);
op3 = (RadioButton) view.findViewById(R.id.radoptionThree);
op1.setOnClickListener(this);
op2.setOnClickListener(this);
op3.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.radoptionOne:
onOptionSelected.onOptionSelected(getAdapterPosition(), 1);
break;
case R.id.radoptionTwo:
onOptionSelected.onOptionSelected(getAdapterPosition(), 2);
break;
case R.id.radoptionThree:
onOptionSelected.onOptionSelected(getAdapterPosition(), 3);
break;
}
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v;
// create a normal view
v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.row_view, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, final int position) {
viewHolder.question.setText(questionModels.get(position).getQuestion());
Log.e("POSITION" + position, "1" + questionModels.get(position).isOp1Sel());
Log.e("POSITION" + position, "2" + questionModels.get(position).isOp2Sel());
Log.e("POSITION" + position, "3" + questionModels.get(position).isOp3Sel());
viewHolder.op1.setChecked(questionModels.get(position).isOp1Sel());
viewHolder.op2.setChecked(questionModels.get(position).isOp2Sel());
viewHolder.op3.setChecked(questionModels.get(position).isOp3Sel());
}
@Override
public int getItemCount() {
if (questionModels != null) {
return questionModels.size();
}
return 0;
}
}
然后是Activity类:
Then the Activity class :
public class MainActivity extends Activity implements OnOptionSelected{
private RecyclerView mRecyclerView;
private List<QuestionModel> questionModels;
private QuestionAdapter questionAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView =(RecyclerView)findViewById(R.id.recyclerViewAppList);
mRecyclerView.setHasFixedSize(true);
questionModels=new ArrayList<QuestionModel>();
for (int i=0;i<20;i++)
{
QuestionModel questionModel=new QuestionModel();
questionModel.setQuestion("Question " + (i + 1));
questionModels.add(questionModel);
}
questionAdapter =new QuestionAdapter();
questionAdapter.setOnOptionSelected(this);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
questionAdapter.setQuestionModels(questionModels);
mRecyclerView.setLayoutManager(layoutManager);
mRecyclerView.setAdapter(questionAdapter);
}
@Override
public void onOptionSelected(int position, int itemSelected) {
questionModels.get(position).setSeleectedAnswerPosition(itemSelected);
switch (itemSelected){
case 1:
questionModels.get(position).setOp1Sel(true);
break;
case 2:
questionModels.get(position).setOp2Sel(true);
break;
case 3:
((QuestionModel)questionModels.get(position)).setOp3Sel(true);
break;
}
questionAdapter.setQuestionModels(questionModels);
questionAdapter.notifyDataSetChanged();
// mRecyclerView.setAdapter(questionAdapter);
}
}
我在Radiogroup上尝试了该解决方案,但是它不能正常工作(有时它保留了旧值).然后,我更改了模型类中选择选项的方式.
I tried the solution with Radiogroup but it was not working properly( sometime it was retaining the old value). Then I changed the way of the selecting options in my model class.
这篇关于选择一个RadioButton值并向后滚动以在RecyclerView中删除所选的一个的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!