之前在activity里面写的东西 放到fragment里面好多错误呀

之前在activity里面写的东西 放到fragment里面好多错误呀 救命

img

onCreate的内容替换如下

@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View mRootView = inflater.inflate(R.layout.fragment_sign_up, null);
    EditText userName = mRootView.findViewById(R.id.UserNameEdit);
    //TODO
    return mRootView;
}

错误不可怕

1.Activity中的xml填充使用setContentView（R.layout.布局文件）
2.fragment

public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
   
   
    return inflater.inflate(R.layout.fragment_sign_up, null);
}