android实现单选按钮功能

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package com.hsj.example.commoncontroldemo02;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity_bak06 extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {

  private RadioGroup radioGroup_gender;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_radio);
    this.radioGroup_gender= (RadioGroup) this.findViewById(R.id.radioGroup_gender);
    this.radioGroup_gender.setOnCheckedChangeListener(this);

  }

  /**
   * 当单选按钮的状态发生变化时自动调用的方法
   * @param group 单选按钮所在的按钮组的对象
   * @param checkedId 用户选中的单选按钮的id值
   */
  @Override
  public void onCheckedChanged(RadioGroup group, int checkedId) {
    //得到用户选中的 RadioButton 对象
    RadioButton radioButton_checked= (RadioButton) group.findViewById(checkedId);
    String gender=radioButton_checked.getText().toString();
    Toast.makeText(this,gender,Toast.LENGTH_LONG).show();
    switch (checkedId){
      case R.id.radioButton_male:
        //当用户点击男性按钮时执行的代码
        System.out.println("===男性===");
        break;
      case R.id.radioButton_female:
        //当用户点击女性按钮时执行的代码
        System.out.println("===女性===");
        break;
    }
    System.out.println("===onCheckedChanged(RadioGroup group="+group+", int checkedId="+checkedId+")==");
  }
}