安卓CheckBox实现单选

开发工具：Android studio
jdk：1.8
安卓谷歌12

1.activity_main.xml：

首先设置一个LinearLayout，里面添加子控件然后和另一个用来显示选择结果的，最后来个button。
效果预览图：代码：

<LinearLayoutandroid:id="@+id/layout"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="vertical"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="=>选择你的性别："android:textColor="@color/purple_200" /><CheckBoxandroid:id="@+id/man"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="20dp"android:text="男" /><CheckBoxandroid:id="@+id/woman"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="20dp"android:text="女" /><TextViewandroid:id="@+id/msg"android:layout_width="match_parent"android:layout_height="match_parent" /><Buttonandroid:id="@+id/button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="10dp"android:text="选择" /></LinearLayout>

2.MainActivity.java

先获取每一个控件

CheckBox man, woman; Button button; TextView msg ;

监听选择状态的方法：

private void initView() {man = (CheckBox) findViewById(R.id.man);woman = (CheckBox) findViewById(R.id.woman);man.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if (isChecked) {man.setChecked(true);woman.setChecked(false);} else {man.setChecked(false);}}});woman.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if (isChecked) {woman.setChecked(true);man.setChecked(false);} else {woman.setChecked(false);}}});

onCreate：button监听获取到checkbox

initView();final LinearLayout layout = (LinearLayout) findViewById(R.id.layout);button = (Button) findViewById(R.id.button);msg = (TextView)findViewById(R.id.msg);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {new AlertDialog.Builder(MainActivity.this).setTitle("提示信息").setMessage("确定选择？").setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {StringBuilder sex = new StringBuilder();sex.append("性别为：");if (man.isChecked()) {sex.append(man.getText().toString() + " ");} else if (woman.isChecked()) {sex.append(woman.getText().toString() + " ");} else {msg.setText("未选择性别。\n");}msg.setText(sex);}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {Toast.makeText(MainActivity.this,"取消选择",Toast.LENGTH_LONG).show();}}).create().show();}});

3.MainActivity.java全代码

package edu.zut.mysqltest;import androidx.appcompat.app.AppCompatActivity;import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast;public class MainActivity extends AppCompatActivity {CheckBox man, woman;Button button;TextView msg ;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();final LinearLayout layout = (LinearLayout) findViewById(R.id.layout);button = (Button) findViewById(R.id.button);msg = (TextView)findViewById(R.id.msg);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {new AlertDialog.Builder(MainActivity.this).setTitle("提示信息").setMessage("确定选择？").setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {StringBuilder sex = new StringBuilder();sex.append("性别为：");if (man.isChecked()) {sex.append(man.getText().toString() + " ");} else if (woman.isChecked()) {sex.append(woman.getText().toString() + " ");} else {msg.setText("未选择性别。\n");}msg.setText(sex);}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {Toast.makeText(MainActivity.this,"取消选择",Toast.LENGTH_LONG).show();}}).create().show();}});}private void initView() {man = (CheckBox) findViewById(R.id.man);woman = (CheckBox) findViewById(R.id.woman);//监听事件man.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if (isChecked) {man.setChecked(true);woman.setChecked(false);} else {man.setChecked(false);}}});woman.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if (isChecked) {woman.setChecked(true);man.setChecked(false);} else {woman.setChecked(false);}}});} }

最后效果图：gif：

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