Turn WiFi On and Off Using Android App

In this article you will learn how to turn WiFi On and Off using an Android app. See the following procedure.

Step 1

First create an Andorid Application Project.



Step 2

Provide a name for the project and select SDK Requirements.



Step 3

Now configure the Android project as you choose.



Step 4

Create an icon for the Android project.



Step 5

Select Activity for Android Project.



Step 6

Select an Activity name and Layout name.



Step 7

Then open the activity_main.xml file.

Drag a Switch Element and one TextView Element to the Graphical Layout of activity_main.xml.

Activity_main.xml file code

<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.example.wifiexample.MainActivity" >
    <Switch
    android:id="@+id/switch1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="27dp"
    android:layout_marginTop="72dp"
    android:text="Switch" />
    <TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignRight="@+id/switch1"
    android:layout_below="@+id/switch1"
    android:layout_marginRight="49dp"
    android:layout_marginTop="88dp"
    android:text="TextView" />
</RelativeLayout>

Step 8

Now go to the AndroidManifest.xml file and add two user permissions as in the following:

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

Step 9

Then open the MainActivity.java file and write some code:

package com.example.wifiexample;

import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.View.OnClickListener;
import android.view.MenuItem;
import android.view.View;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
    Switch s;
    WifiManager wm;
    TextView t;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        wm=(WifiManager)getSystemService(Context.WIFI_SERVICE);
        s=(Switch)findViewById(R.id.switch1);
        t=(TextView)findViewById(R.id.textView1);
        s.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if(s.isChecked())
                {
                    wm.setWifiEnabled(true);
                    getwifi();
                    Toast.makeText(MainActivity.this, "WIFI is ON", 3000).show();
                }
                else{
                    wm.setWifiEnabled(false);
                    getwifi();
                    Toast.makeText(MainActivity.this, "WIFI is OFF", 3000).show();
                }
            }
        });
        getwifi();

    }
    public void getwifi()
    {
        if(wm.isWifiEnabled()){
            s.setChecked(true);
            Toast.makeText(this, "WIFI is ON", 3000).show();
            WifiInfo w = wm.getConnectionInfo();
            t.setText("BSSID : " + w.getBSSID() + "\n");
            t.append("RSSID : " + w.getRssi() + "\n");
            t.append("SIGNAL : " + w.getLinkSpeed() + "\n");
            t.append("SSID : " + w.getSSID() + "\n");
        }
        else
        {
            t.setText("Not Connected");
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

Step 10

Now run the app in a real Andorid phone because the AVD does not support this app.





Enjoy.