如何将动态加载的单选按钮放入一个组中？

Question

单选按钮应该是互斥的。 但他们需要在一个“广播组”中。

根据文档，“通过将它们组合在一起，系统可以确保一次只能选择一个单选按钮。”

我制作了一些单选按钮（动态加载），并确保将它们放在一个组中。 但是，它们并不是相互排斥的，我可以一次检查所有这些。

我该如何解决？

这是代码：

public class MainActivity extends AppCompatActivity {

    private LinearLayout candidatesLayout;
    private String[] candidates = {"Smith","Johnson","Williams","Brown","Jones","Garcia","Miller","Davis","Rodriguez","Martinez"};

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

        candidatesLayout = (LinearLayout) findViewById(R.id.candidatesLayout);

        final int N = candidates.length; // total number of textviews to add
        final TextView[] myTextViews = new TextView[N]; // create an empty array;

        for (int i = 0; i < N; i++) {
            // create a new textview
            final TextView rowTextView = new TextView(this); //rowTextView is persons name
            //create horizonal parent for radio buttons
            LinearLayout radioButtons = new LinearLayout(this);
            LinearLayout numbers = new LinearLayout(this);
            radioButtons.setOrientation(LinearLayout.HORIZONTAL);
            //create new radio buttons
            final RadioGroup radioGroup = new RadioGroup(this);
            RadioButton button;
            for(int ii = 0; ii < N; ii++) {
                button = new RadioButton(this); //I should not be able to click more than one of these!
                radioButtons.addView(button);
            }
            candidatesLayout.addView(rowTextView);
            candidatesLayout.addView(radioButtons);
          }

    }
}

我猜他们并不真正属于我认为他们所在的群体。

Answer 1

您已创建RadioGroup ，但未将其添加到布局中。 因此，将添加的单选按钮替换为以下代码段：

 for (int i = 0; i < N; i++) {
    // create a new textview
    final TextView rowTextView = new TextView(this); //rowTextView is persons name
    //create horizonal parent for radio buttons
    LinearLayout radioButtons = new LinearLayout(this);
    LinearLayout numbers = new LinearLayout(this);
    radioButtons.setOrientation(LinearLayout.HORIZONTAL);
    //create new radio buttons
    final RadioGroup radioGroup = new RadioGroup(this);
    RadioButton button;
    for(int ii = 0; ii < N; ii++) {
        button = new RadioButton(this); 
        radioGroup.addView(button);  // <-- Add to Group
    }
    candidatesLayout.addView(rowTextView);
    candidatesLayout.addView(radioGroup);  // Add Group itself
  }