将字符串值从FragmentContainerView传递给单击按钮时的活动

public interface OnButtonClickListener {
    void onButtonClick(String value);
}

private OnButtonClickListener mListener;

@Override
public void onAttach(@NonNull Context context) {
    super.onAttach(context);
    try {
        mListener = (OnButtonClickListener) context;
    } catch (ClassCastException e) {
        throw new ClassCastException(context.toString() + " must implement OnButtonClickListener");
    }
}

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if (mListener != null) {
            String value = "Your string value";
            mListener.onButtonClick(value);
        }
    }
});

public class MainActivity extends AppCompatActivity implements OnButtonClickListener {
    // ...

    @Override
    public void onButtonClick(String value) {
        // 处理传递的字符串值
    }
}