RadioGroup初识

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_radio_button"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.axnet.buju0711.RadioButtonActivity">    <!--checked默认选择-->    <RadioGroup        android:id="@+id/rg1"        android:layout_height="wrap_content"        android:layout_width="match_parent"        android:orientation="horizontal"        >        <RadioButton            android:id="@+id/man"            android:layout_height="wrap_content"            android:layout_width="wrap_content"            android:text="男"            android:layout_weight="1"            android:checked="true"            />        <RadioButton            android:id="@+id/woman"            android:layout_height="wrap_content"            android:layout_width="wrap_content"            android:layout_weight="1"            android:text="女"            />    </RadioGroup>    <TextView      style="@style/wr"      android:id="@+id/tv1"      android:text="text"      android:textSize="28sp"        /></LinearLayout>

public class RadioButtonActivity extends AppCompatActivity {    private RadioGroup rg1;    private TextView tv1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_radio_button);        init();        rg1.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                switch (checkedId){                    case R.id.woman:                        tv1.setText("women");                        break;                    case R.id.man:                        tv1.setText("man");                    default:                        break;                }            }        });    }    private void init() {        rg1=(RadioGroup)findViewById(R.id.rg1);        tv1=(TextView)findViewById(R.id.tv1);    }}