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Android - Application to Display All Available WiFi Network and Connect with Specific Network.

In this code snippet/application, we will learn how to display all available WiFi network and connect with a specific WiFi network in mobile/tablet?

This application contains following files

1. activity_main.xml
2. MainActivity.java
3. AndroidManifest.xml
4. connect.xml
5. list_item.xml

Android Code Snippet - Application to Display all Available WiFi and Connect with Specific WiFi Network

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.includehelp.wifilist.MainActivity">

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</RelativeLayout>

MainActivity.java

package com.includehelp.wifilist;

import android.annotation.SuppressLint;
import android.app.Dialog;
import android.app.ListActivity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class MainActivity extends ListActivity {
    WifiManager mainWifiObj;
    WifiScanReceiver wifiReciever;
    ListView list;
    String wifis[];

    EditText pass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        list=getListView();
        mainWifiObj = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        wifiReciever = new WifiScanReceiver();
        mainWifiObj.startScan();

        // listening to single list item on click
        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                // selected item
                String ssid = ((TextView) view).getText().toString();
                connectToWifi(ssid);
                Toast.makeText(MainActivity.this,"Wifi SSID : "+ssid,Toast.LENGTH_SHORT).show();

            }
        });
    }

    protected void onPause() {
        unregisterReceiver(wifiReciever);
        super.onPause();
    }

    protected void onResume() {
        registerReceiver(wifiReciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
        super.onResume();
    }
    class WifiScanReceiver extends BroadcastReceiver {
        @SuppressLint("UseValueOf")
        public void onReceive(Context c, Intent intent) {
            List<ScanResult> wifiScanList = mainWifiObj.getScanResults();
            wifis = new String[wifiScanList.size()];
            for(int i = 0; i < wifiScanList.size(); i++){
                wifis[i] = ((wifiScanList.get(i)).toString());
            }
            String filtered[] = new String[wifiScanList.size()];
            int counter = 0;
            for (String eachWifi : wifis) {
                String[] temp = eachWifi.split(",");

                filtered[counter] = temp[0].substring(5).trim();//+"\n" + temp[2].substring(12).trim()+"\n" +temp[3].substring(6).trim();//0->SSID, 2->Key Management 3-> Strength

                counter++;

            }
            list.setAdapter(new ArrayAdapter<String>(getApplicationContext(),R.layout.list_item,R.id.label, filtered));


        }
    }

    private void finallyConnect(String networkPass, String networkSSID) {
        WifiConfiguration wifiConfig = new WifiConfiguration();
        wifiConfig.SSID = String.format("\"%s\"", networkSSID);
        wifiConfig.preSharedKey = String.format("\"%s\"", networkPass);

        // remember id
        int netId = mainWifiObj.addNetwork(wifiConfig);
        mainWifiObj.disconnect();
        mainWifiObj.enableNetwork(netId, true);
        mainWifiObj.reconnect();

        WifiConfiguration conf = new WifiConfiguration();
        conf.SSID = "\"\"" + networkSSID + "\"\"";
        conf.preSharedKey = "\"" + networkPass + "\"";
        mainWifiObj.addNetwork(conf);
    }

    private void connectToWifi(final String wifiSSID) {
        final Dialog dialog = new Dialog(this);
        dialog.setContentView(R.layout.connect);
        dialog.setTitle("Connect to Network");
        TextView textSSID = (TextView) dialog.findViewById(R.id.textSSID1);

        Button dialogButton = (Button) dialog.findViewById(R.id.okButton);
        pass = (EditText) dialog.findViewById(R.id.textPassword);
        textSSID.setText(wifiSSID);

        // if button is clicked, connect to the network;
        dialogButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String checkPassword = pass.getText().toString();
                finallyConnect(checkPassword, wifiSSID);
                dialog.dismiss();
            }
        });
        dialog.show();
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.includehelp.wifilist">

    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

connect.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.includehelp.wifilist.MainActivity">

   <TextView
       android:id="@+id/textSSID1"
       android:layout_width="match_parent"
       android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/textPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/textSSID1"
        android:layout_marginTop="5dp"/>

    <Button
        android:id="@+id/okButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/textPassword"
         android:text="Connect"/>
</RelativeLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<!--  Single List Item Design -->
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/label"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dip"
    android:textSize="16dip"
    android:textStyle="bold"
    android:textColor="@android:color/holo_blue_dark">
</TextView>

Result