在片段中从editText获取值并进行计算

<EditText
    android:id="@+id/editText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="numberDecimal"
    android:hint="输入数值" />

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

    EditText editText = view.findViewById(R.id.editText);
    Button calculateButton = view.findViewById(R.id.calculateButton);

    calculateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String valueString = editText.getText().toString();
            if (!valueString.isEmpty()) {
                double value = Double.parseDouble(valueString);
                // 进行计算操作，例如计算平方
                double result = value * value;
                Toast.makeText(getActivity(), "计算结果：" + result, Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(getActivity(), "请输入数值", Toast.LENGTH_SHORT).show();
            }
        }
    });

    return view;
}