android开发之获取RadioGroup选中项的值

一.布局代码

定义一个RadioGroup，包含两个RadioButton

  <RadioGroup
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="horizontal"
         android:id="@+id/rdgroup">
         <RadioButton
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="男"
             android:checked="true"
             android:id="@+id/rdman"
             android:textSize="20dp"/>
         <RadioButton
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="女"
             android:id="@+id/rdwoman"
             android:textSize="20dp"
             android:layout_marginRight="20dp"/>
     </RadioGroup>
    </LinearLayout>
    

二.java代码

public class activity01 extends AppCompatActivity {
    RadioButton radiobutton;
    RadioGroup rdgroup;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity01);
        //找到RadioGroup
        rdgroup=(RadioGroup)findViewById(R.id.rdgroup);
        //给RadioGroup设置选中项改变监听
        rdgroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {
            }
        });
        //通过getCheckedRadioButtonId（）方法找到RadioGroup中被选中的radiobutton
          radiobutton=(RadioButton)findViewById(rdgroup.getCheckedRadioButtonId());
         // 获取radiobutton的值
           String sex = radiobutton.getText().toString();
    }