我正在尝试创建一个应用程序,只要您单击导航抽屉中的选项,就会显示一个片段。但是,在创建BlankFragment时(使用BlankFragment fragment = new BlankFragment();
,我收到错误:BlankFragment
变为红色,而Android Studio无法识别它。
MainActivity.java
...
} else if (id == R.id.nav_shooks) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
BlankFragment fragment = new BlankFragment();
transaction.add(R.id.shooksLayout, fragment);
transaction.commit();
} else if (id == R.id.nav_prizes) {
...
ShooksFragment
package com.shook.android.shook;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link ShooksFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
*/
public class ShooksFragment extends Fragment {
private OnFragmentInteractionListener mListener;
public ShooksFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_shooks, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
Here is the error. As you can see, the word BlankFragment is in red
答案 0 :(得分:1)
你错过了ShooksFragment中的df$mgr_mgr_id <- mapply(get_mgr_mgr_id, df$mgr_id, df$period)
df
id mgr_id period left joined mgr_mgr_id
1 1 NA 1 1 0 NA
2 2 1 1 0 0 NA
3 3 1 1 0 0 NA
4 4 2 1 0 0 1
5 5 2 1 0 0 1
6 6 2 1 0 0 1
7 7 2 1 0 0 1
8 8 3 1 0 0 1
9 9 3 1 0 0 1
10 10 5 1 0 0 2
11 11 5 1 0 0 2
12 2 NA 2 0 0 NA
13 3 2 2 0 0 NA
14 4 5 2 0 0 2
15 5 2 2 0 0 NA
16 6 5 2 0 0 2
17 7 5 2 0 0 2
18 8 3 2 0 0 2
19 9 3 2 0 0 2
20 10 5 2 0 0 2
21 11 10 2 0 0 5
22 12 10 2 0 1 5
方法,
添加此方法,请报告回来。
newInstance()
编辑:
由于你想在MainActivity中加载ShooksFragment,你可以简单地创建一个ShooksFragment的对象并使用片段管理器加载该片段。
// TODO: Rename and change types and number of parameters
public static ShooksFragment newInstance() {
ShooksFragment fragment = new ShooksFragment();
return fragment;
}