如何在android中选择/取消选择ListView阵列适配器的单选按钮

我正在使用listview适配器中的radiobutton，我想要的是选择/取消选择我单击的radiobutton。

将单选按钮状态保存在列表中，或者如果只有一个选择，在这种情况下，您可以保存int变量中的特定位置，并在选择后更新变量的值。do

adapter.notifyDataSetChanged（）

。您需要在

getView

中编写代码以反映更改

粗略示例：（我现在对listview（检查recyclerview）很老了，但是你的Adpeter应该是这样的）

---

将clickListener添加到Radio按钮，这样，如果您单击Radio按钮，它将取消选中。（默认情况下，如果未选中，则单击时将选中）

---

在这一步中，我们首先获得

按钮

和

列表视图

的引用。之后，我们为问题创建一个字符串数组，然后设置一个

适配器

来填充

列表视图中的数据。最后，我们在
按钮上执行
setOnClickListener
事件，因此每当用户单击
按钮
时，都会使用
Toast
显示所选的问题答案

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

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();
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}
}


In this step we create a custom adapter class and extends BaseAdapter in this class. In this step we firstly set the data in the list and then perform setOnCheckedChangeListener event on RadioButton.


import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.TextView;

import java.util.ArrayList;


public class CustomAdapter extends BaseAdapter {
Context context;
String[] questionsList;
LayoutInflater inflter;
public static ArrayList<String> selectedAnswers;

public CustomAdapter(Context applicationContext, String[] questionsList) {
this.context = context;
this.questionsList = questionsList;
// initialize arraylist and add static string for all the questions
selectedAnswers = new ArrayList<>();
for (int i = 0; i < questionsList.length; i++) {
selectedAnswers.add("Not Attempted");
}
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;
}

@Override
public View getView(final int i, View view, ViewGroup viewGroup) {
view = inflter.inflate(R.layout.list_items, null);
// get the reference of TextView and Button's
TextView question = (TextView) view.findViewById(R.id.question);
RadioButton yes = (RadioButton) view.findViewById(R.id.yes);
RadioButton no = (RadioButton) view.findViewById(R.id.no);
// perform setOnCheckedChangeListener event on yes button
yes.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(i, "Yes");
}
});
// perform setOnCheckedChangeListener event on no button
no.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// set No values in ArrayList if RadioButton is checked
if (isChecked)
selectedAnswers.set(i, "No");

}
});
// set the value in TextView
question.setText(questionsList[i]);
return view;
}
}

导入android.os.Bundle；
导入android.support.v7.app.AppActivity；
导入android.view.Menu；
导入android.view.MenuItem；
导入android.view.view；
导入android.widget.Button；
导入android.widget.ListView；
导入android.widget.Toast；
公共类MainActivity扩展了AppCompatActivity{
ListView单纯形列表；
字符串[]问题；
按钮提交；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
//从string.xml文件获取字符串数组
questions=getResources（）.getStringArray（R.array.questions）；
//获取ListView和Button的引用
simpleList=（ListView）findViewById（R.id.simpleList视图）；
提交=（按钮）findViewById（R.id.submit）；
//设置适配器以填充ListView中的数据
CustomAdapter CustomAdapter=新的CustomAdapter（getApplicationContext（），问题）；
simpleList.setAdapter（customAdapter）；
//在按钮上执行SetOnClickListener事件
submit.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
字符串消息=”；
//从自定义适配器获取所选答案的值
对于（int i=0；i
您尝试了什么？和共享一些代码密钥，我尝试在适配器类中使用单选按钮，但一旦选中，我就无法选中/取消选中单选按钮。下面提供了答案。嘿，我有ListView，根据用户需要，用户可以添加他所需的数据，并根据他的点击选择或取消选择列表项。您尝试过这个解决方案吗？嘿，我有ListView，根据用户需要，用户
radioButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                if (radioButton.isChecked()) {
                radioButton.setChecked(false);
                }
            }
        });

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

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();
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}
}


In this step we create a custom adapter class and extends BaseAdapter in this class. In this step we firstly set the data in the list and then perform setOnCheckedChangeListener event on RadioButton.


import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.TextView;

import java.util.ArrayList;


public class CustomAdapter extends BaseAdapter {
Context context;
String[] questionsList;
LayoutInflater inflter;
public static ArrayList<String> selectedAnswers;

public CustomAdapter(Context applicationContext, String[] questionsList) {
this.context = context;
this.questionsList = questionsList;
// initialize arraylist and add static string for all the questions
selectedAnswers = new ArrayList<>();
for (int i = 0; i < questionsList.length; i++) {
selectedAnswers.add("Not Attempted");
}
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;
}

@Override
public View getView(final int i, View view, ViewGroup viewGroup) {
view = inflter.inflate(R.layout.list_items, null);
// get the reference of TextView and Button's
TextView question = (TextView) view.findViewById(R.id.question);
RadioButton yes = (RadioButton) view.findViewById(R.id.yes);
RadioButton no = (RadioButton) view.findViewById(R.id.no);
// perform setOnCheckedChangeListener event on yes button
yes.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(i, "Yes");
}
});
// perform setOnCheckedChangeListener event on no button
no.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// set No values in ArrayList if RadioButton is checked
if (isChecked)
selectedAnswers.set(i, "No");

}
});
// set the value in TextView
question.setText(questionsList[i]);
return view;
}
}

radiogroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // Radio button
                RadioButton rb1=(RadioButton)findViewById(R.id.rdb1);
                if (rb1.isChecked()){
                    Toast.makeText(MainActivity.this, "1 option selected", Toast.LENGTH_LONG).show();
                }
                else{
                    Toast.makeText(MainActivity.this, "2 option selected", Toast.LENGTH_LONG).show();

                }
            }
        });