RadioGroup开关

   RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                Toast.makeText(MainActivity.this,
                        checkedId == R.id.radioButton_boy?"生男孩":"生女孩",
                        Toast.LENGTH_SHORT).show();
            }
        });

  <RadioGroup
        android:orientation="horizontal"
        android:id="@+id/radioGroup"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <RadioButton
            android:text="男孩"
            android:id="@+id/radioButton_boy"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <RadioButton
            android:text="女孩"
            android:id="@+id/radioButton_girl"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </RadioGroup>