Fragment3

package com.example.week;

import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * Created by 生哥 on 2017/12/2.
 */

public class Fragment3 extends Fragment {
    private WifiManager wm;
    private TextView tv3;

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment3, container, false);
        tv3 = view.findViewById(R.id.tv3);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        wm = (WifiManager) getActivity().getApplicationContext()
                .getSystemService(Context.WIFI_SERVICE);
        if (wm != null){
            boolean b = wm.isWifiEnabled();
            if(b){
                tv3.setText("没开");
            }else {
                tv3.setText("开了");
            }
        }else {
            tv3.setText("没有");
        }
    }
}