Android RadioButton使用

例题2-12

activity_main.xml代码

<?xml version="1.0" encoding="utf-8"?>
<GridLayout android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:columnCount="4"
    android:rowCount="6"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <RadioGroup>
        <RadioButton android:id="@+id/boy"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="男"/>
        <RadioButton android:id="@+id/girl"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="女"/>
    </RadioGroup>
    <Button android:id="@+id/but1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="确认"
        android:layout_columnSpan="4"/>
    <TextView android:id="@+id/text1"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="" />
</GridLayout>

mainactivity.java代码

package com.example.hello;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ProgressBar;
import android.widget.RadioButton;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    Button but1;
    TextView textView;
    RadioButton radioButton1,radioButton2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView)findViewById(R.id.text1);
        but1 = (Button)findViewById(R.id.but1);
        radioButton1 = (RadioButton)findViewById(R.id.boy);
        radioButton2 = (RadioButton)findViewById(R.id.girl);
        but1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String s="";
                if(radioButton1.isChecked())
                    s=s+radioButton1.getText();
                if (radioButton2.isChecked())
                    s=s+radioButton2.getText();
                textView.setText("性别："+s);
            }
        });

    }

}