Question

我正在尝试在片段而不是活动中使用RadioGroup小部件。我在以下代码行中遇到错误：

RadioButton button = new RadioButton(this);

我不确定要传递什么，而不是“ this”

我认为问题出在上面的摘录中或此处：

RadioGroup group = (RadioGroup) getView().findViewById(R.id.radioGroup);

完整代码：

public class fragment1 extends Fragment {

private Button btnNextFrag;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment1_layout, container, false);

    createRadioButtons();
    return view;
}

private void createRadioButtons() {
    RadioGroup group = (RadioGroup) getView().findViewById(R.id.radioGroup);

    String[] questions1 = getResources().getStringArray(R.array.question_1_answers);
    for (int i=0;i<questions1.length;i++){
        String question = questions1[i];

        RadioButton button = new RadioButton(this);
        button.setText(question);
        group.addView(button);
    }
 }
}

Answer 1

构造函数需要上下文，因此请使用getActivity()而不是this。您也可以使用getContext()。

Answer 2

public class fragment1 extends Fragment {

private Button btnNextFrag;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment1_layout, container, false);
    createRadioButton(view);
    return view;

}

private void createRadioButton(View view) {
    RadioGroup group = (RadioGroup)view.findViewById(R.id.radioGroup);

    String[] questions1 = getResources().getStringArray(R.array.question_1_answers);
    for (int i=0;i<questions1.length;i++){
        String question = questions1[i];
        RadioButton button = new RadioButton(getActivity());
        button.setText(question);
        group.addView(button);
    }
}


}

在片段而不是活动中传递无线电组的上下文？

2 个答案: