android studio 1.5.1, marshmallow no internet access detected won't automatically reconnect

Question

I'm having this problem on some 2013 Nexus 7's.

got some code to work (please see below).

package acme.wifi;
import android.content.*;
import android.net.wifi.*;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;

import java.math.*;
import java.net.*;
import java.nio.*;
import java.util.*;
public class MainActivity extends AppCompatActivity {
    void retry() {
        WifiManager wifiMan=(WifiManager)getSystemService(Context.WIFI_SERVICE);
        WifiInfo wifiInf;
        int ipAddress;
        List<WifiConfiguration> wifiConfigurations=wifiMan.getConfiguredNetworks();
        System.out.println("wifi configurations (all): "+wifiConfigurations.size());
        for(WifiConfiguration wifiConfiguration : wifiConfigurations) {
            if(wifiConfiguration.toString().contains("192.168.0.")) {
                System.out.println("found our network: "+wifiConfiguration.toString());
                System.out.println("SSID: "+wifiConfiguration.SSID);
                System.out.println("wifi configuration status is disabled: "+(wifiConfiguration.status==WifiConfiguration.Status.DISABLED));
                int networkId=wifiConfiguration.networkId;
                boolean ok=wifiMan.disconnect();
                System.out.println("disconnect() returns: "+ok);
                System.out.println("enabling our network: "+networkId);
                // https://code.google.com/p/android-developer-preview/issues/detail?id=2218
                ok=wifiMan.enableNetwork(networkId,true);
                System.out.println("enableNetwork() returns: "+ok);
                System.out.println("trying to recommect to wifi.");
                ok=wifiMan.reconnect();
                System.out.println("reconnect returns: "+ok);
                if(ok) {
                    wifiMan=(WifiManager)getSystemService(Context.WIFI_SERVICE);
                    wifiInf=wifiMan.getConnectionInfo();
                    ipAddress=wifiInf.getIpAddress();
                    System.out.println("wifi ip adress: "+ipAddress);
                }
                break;
            }
        }
    }
    String getIpAddressFromWifiManager() {
        WifiManager wifiMan=(WifiManager)getSystemService(Context.WIFI_SERVICE);
        System.out.println("isWifiEnabled() returns: "+wifiMan.isWifiEnabled());
        WifiInfo wifiInf=wifiMan.getConnectionInfo();
        System.out.println("wifi info: "+wifiInf);
        int ipAddress=wifiInf.getIpAddress();
        System.out.println("wifi ip adress: "+ipAddress);
        if(ByteOrder.nativeOrder().equals(ByteOrder.LITTLE_ENDIAN))
            ipAddress=Integer.reverseBytes(ipAddress);
        byte[] ipByteArray=BigInteger.valueOf(ipAddress).toByteArray();
        String ipAddressString=null;
        try {
            ipAddressString=InetAddress.getByAddress(ipByteArray).getHostAddress();
        } catch(UnknownHostException ex) {
            System.out.println("Unable to get host address.");
            if(true)
                retry();
        }
        return ipAddressString;
    }
    public class W extends Thread {
        W(int sleep) {
            this.sleep=sleep;
        }
        @Override public void run() {
            try {
                Thread.sleep(sleep);
            } catch(InterruptedException e) {
                System.out.println("1 caught: "+e);
            }
            String ipAddress=getIpAddressFromWifiManager();
            System.out.println("ip address: "+ipAddress);
            if(ipAddress==null)
                new W(5_000).start();
        }
        int sleep;
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar=(Toolbar)findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        FloatingActionButton fab=(FloatingActionButton)findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view,"Replace with your own action",Snackbar.LENGTH_LONG).setAction("Action",null).show();
            }
        });
        new W(0).start();
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main,menu);
        return true;
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id=item.getItemId();
        //noinspection SimplifiableIfStatement
        if(id==R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

02-22 19:41:08.637 2715-2734/? I/System.out: isWifiEnabled() returns: true
02-22 19:41:08.638 2715-2734/? I/System.out: wifi info: SSID: , BSSID: 00:00:00:00:00:00, MAC: 02:00:00:00:00:00, Supplicant state: SCANNING, RSSI: -127, Link speed: -1Mbps, Frequency: -1MHz, Net ID: -1, Metered hint: false, score: 0
02-22 19:41:08.638 2715-2734/? I/System.out: wifi ip adress: 0
02-22 19:41:08.638 2715-2734/? I/System.out: Unable to get host address.
02-22 19:41:08.644 2715-2734/? I/System.out: wifi configurations (all): 1
02-22 19:41:08.646 2715-2734/? I/System.out: found our network: ID: 0 SSID: "tablets" PROVIDER-NAME: null BSSID: null FQDN: null PRIO: 2
02-22 19:41:08.646 2715-2734/? I/System.out:  numAssociation 74
02-22 19:41:08.646 2715-2734/? I/System.out:  numNoInternetAccessReports 11
02-22 19:41:08.646 2715-2734/? I/System.out:  KeyMgmt: NONE Protocols: WPA RSN
02-22 19:41:08.647 2715-2734/? I/System.out:  AuthAlgorithms: OPEN SHARED
02-22 19:41:08.647 2715-2734/? I/System.out:  PairwiseCiphers: TKIP CCMP
02-22 19:41:08.647 2715-2734/? I/System.out:  GroupCiphers: TKIP CCMP
02-22 19:41:08.647 2715-2734/? I/System.out:  PSK: 
02-22 19:41:08.647 2715-2734/? I/System.out: Enterprise config:
02-22 19:41:08.647 2715-2734/? I/System.out: password NULL
02-22 19:41:08.647 2715-2734/? I/System.out: engine 0
02-22 19:41:08.647 2715-2734/? I/System.out: client_cert NULL
02-22 19:41:08.647 2715-2734/? I/System.out: anonymous_identity NULL
02-22 19:41:08.647 2715-2734/? I/System.out: identity NULL
02-22 19:41:08.647 2715-2734/? I/System.out: domain_suffix_match NULL
02-22 19:41:08.647 2715-2734/? I/System.out: phase2 NULL
02-22 19:41:08.647 2715-2734/? I/System.out: altsubject_match NULL
02-22 19:41:08.647 2715-2734/? I/System.out: subject_match NULL
02-22 19:41:08.647 2715-2734/? I/System.out: ca_cert NULL
02-22 19:41:08.647 2715-2734/? I/System.out: phase1 NULL
02-22 19:41:08.647 2715-2734/? I/System.out: key_id NULL
02-22 19:41:08.647 2715-2734/? I/System.out: engine_id NULL
02-22 19:41:08.647 2715-2734/? I/System.out: eap NULL
02-22 19:41:08.647 2715-2734/? I/System.out: IP config:
02-22 19:41:08.647 2715-2734/? I/System.out: IP assignment: STATIC
02-22 19:41:08.647 2715-2734/? I/System.out: Static configuration: IP address 192.168.0.11/24 Gateway 192.168.0.1  DNS servers: [ 8.8.8.8 ] Domains
02-22 19:41:08.647 2715-2734/? I/System.out: Proxy settings: NONE
02-22 19:41:08.647 2715-2734/? I/System.out:  cuid=1000 cname=android.uid.system:1000 luid=1000 lname=android.uid.system:1000 lcuid=10044 userApproved=USER_APPROVED noInternetAccessExpected=false roamingFailureBlackListTimeMilli: 1000
02-22 19:41:08.647 2715-2734/? I/System.out: triggeredLow: 0 triggeredBad: 0 triggeredNotHigh: 0
02-22 19:41:08.647 2715-2734/? I/System.out: ticksLow: 0 ticksBad: 0 ticksNotHigh: 0
02-22 19:41:08.647 2715-2734/? I/System.out: triggeredJoin: 0
02-22 19:41:08.648 2715-2734/? I/System.out: autoJoinBailedDueToLowRssi: false
02-22 19:41:08.648 2715-2734/? I/System.out: autoJoinUseAggressiveJoinAttemptThreshold: 0
02-22 19:41:08.648 2715-2734/? I/System.out: SSID: "tablets"
02-22 19:41:08.648 2715-2734/? I/System.out: wifi configuration status is disabled: false
02-22 19:41:08.649 2715-2734/? I/System.out: disconnect() returns: true
02-22 19:41:08.649 2715-2734/? I/System.out: enabling our network: 0
02-22 19:41:08.738 2715-2734/? I/System.out: enableNetwork() returns: true
02-22 19:41:08.738 2715-2734/? I/System.out: trying to recommect to wifi.
02-22 19:41:08.739 2715-2734/? I/System.out: reconnect returns: true
02-22 19:41:08.740 2715-2734/? I/System.out: wifi ip adress: 0
02-22 19:41:08.740 2715-2734/? I/System.out: ip address: null
02-22 19:41:13.744 2715-2741/? I/System.out: isWifiEnabled() returns: true
02-22 19:41:13.747 2715-2741/? I/System.out: wifi info: SSID: tablets, BSSID: 60:e3:27:fb:8d:5a, MAC: 02:00:00:00:00:00, Supplicant state: COMPLETED, RSSI: -40, Link speed: 54Mbps, Frequency: 2462MHz, Net ID: 0, Metered hint: false, score: 60
02-22 19:41:13.747 2715-2741/? I/System.out: wifi ip adress: 184592576
02-22 19:41:13.748 2715-2741/? I/System.out: ip address: 192.168.0.11

Answer 1

I was facing the same problem, but I have solved it.

Add these permissions:

• android.permission.ACCESS_FINE_LOCATION
• android.permission.ACCESS_COARSE_LOCATION

and Keep Location Service ON.

Strange but true.