Android类名出现错误

package com.example.myapplication;

import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
* Created by Administrator on 2017/5/6.
*/
public class FirstFragment extends Fragment {
private String context;
private TextView mTextView;

public FirstFragment(String context){
this.context = context;
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.first_fragment,container,false);
mTextView = (TextView)view.findViewById(R.id.txt_content);
//mTextView = (TextView)getActivity().findViewById(R.id.txt_content);
mTextView.setText(context);
return view;
}
}
这是源码，老是出现
This fragment should provide a default constructor (a public constructor with no arguments) (com.example.myapplication.FirstFragment) less... (Ctrl+F1)
From the Fragment documentation: Every fragment must have an empty constructor, so it can be instantiated when restoring its activity's state. It is strongly recommended that subclasses do not have other constructors with parameters, since these constructors will not be called when the fragment is re-instantiated; instead, arguments can be supplied by the caller with setArguments(Bundle) and later retrieved by the Fragment with getArguments().
什么意思