安卓app_sl3_14单选按钮示范

package com.example.sl3_14;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final RadioGroup sex=(RadioGroup) findViewById(R.id.radioGroup1);
        sex.setOnCheckedChangeListener(new OnCheckedChangeListener(){

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // TODO 自动生成的方法存根
                RadioButton r=(RadioButton)findViewById(checkedId);
                String text="您的选择是："+r.getText();
                Toast toast=Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT);
                toast.show();
                
            }
            
        });
        Button button=(Button)findViewById(R.id.button1);
        button.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO 自动生成的方法存根
                for(int i=0;i<sex.getChildCount();i++)
                {
                    RadioButton r1=(RadioButton)sex.getChildAt(i);
                    if(r1.isChecked())
                    { 
                        String ttx="点击提交按钮后的值："+r1.getText();
                        Toast tt1=Toast.makeText(MainActivity.this, ttx, Toast.LENGTH_SHORT);
                        tt1.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.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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context="com.example.sl3_14.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="40px"
        android:text="性别:" />
    <RadioGroup
        android:id="@+id/radioGroup1"
        android:orientation="horizontal"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" >
        <RadioButton
        android:id="@+id/radioButton1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="男" />
        <RadioButton
        android:id="@+id/radioButton2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="女" />
        
        
        
    </RadioGroup>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="提交" />

</LinearLayout>