我可以在其中动态创建带有单选按钮的 RadioGroup（没有 xml）吗？

Question

我想在 onCreate 函数中创建 RadioGroup，其中包含 RadioButton 列表。我想使用 xml-layout 将其作为练习来完成。可能吗？谢谢。

Answer 1

类似这样的：

....
RadioGroup group = new RadioGroup(this); 
group.setOrientation(RadioGroup.HORIZONTAL);
RadioButton btn1 = new RadioButton(this);
btn1.setText("BTN1");
group.addView(btn1);
RadioButton btn2 = new RadioButton(this);
group.addView(btn2);
btn2.setText("BTN2");
.... 
RadioButton btnN = new RadioButton(this);
group.addView(btnN);
btnN.setText("BTNN");
yourLayout.addView(group);
....

Answer 2

这样就可以了：

    int buttons = 5;

    RadioGroup rgp = new RadioGroup(getApplicationContext());

    for (int i = 1; i <= buttons; i++) {
        RadioButton rbn = new RadioButton(this);
        rbn.setId(1 + 1000);
        rbn.setText("RadioButton" + i);
        //Attach button to RadioGroup.
        rgp.addView(rbn);
    }

    ViewGroup viewGroup = (ViewGroup) ((ViewGroup) this
            .findViewById(android.R.id.content)).getChildAt(0);
    viewGroup.addView(rgp);

---

这是一个完整的例子：

public class MainActivity extends AppCompatActivity {

  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Defining buttons quantity!
        int buttons = 5;

        //Create a new instance of RadioGroup.
        RadioGroup rgp = new RadioGroup(getApplicationContext());

        //Create buttons!
        for (int i = 1; i <= buttons; i++) {
            RadioButton rbn = new RadioButton(this);
            rbn.setId(1 + 1000);
            rbn.setText("RadioButton" + i);
            //Attach button to RadioGroup.
            rgp.addView(rbn);
        }

        //Get the root view.
        ViewGroup viewGroup = (ViewGroup) ((ViewGroup) this
                .findViewById(android.R.id.content)).getChildAt(0);
        viewGroup.addView(rgp);


    }
}

结果如下：

如果您需要使用在 xml 布局中定义的 RadioGroup 并添加动态按钮，请参阅this answer。