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 wifi configuration of android
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What is Wifi ?

  • Wi-Fi is the name of a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections. A common misconception is that the term Wi-Fi is short for "wireless fidelity," however this is not the case.
  • Wi-Fi networks have no physical wired connection between sender and receiver by using radio frequency (RF ) technology a frequency within the electromagnetic spectrum associated with radio wave propagation.
  • When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space.
  • android wifi
  • The android.net.wifi.WifiManager class can be used to manage the wifi connectivity. It can be used to add network, disable network, scan for access points, disconnect etc.
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Android wifi example to enable and disable wifi

  • Let's see the simple example of wifi to enable and disable the wifi service.

activity_main.xml

  • File: activity_main.xml
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<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context=".MainActivity" >  
  
    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentLeft="true"  
        android:layout_alignParentTop="true"  
        android:layout_marginLeft="76dp"  
        android:layout_marginTop="67dp"  
        android:text="Enable Wifi" />  
  
    <Button  
        android:id="@+id/button2"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignLeft="@+id/button1"  
        android:layout_below="@+id/button1"  
        android:layout_marginTop="44dp"  
        android:text="Disable Wifi" />  
  
</RelativeLayout> 
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Activity class

  • File: MainActivity.java
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package com.example.wifi;  
  
import android.net.wifi.WifiManager;  
import android.os.Bundle;  
import android.app.Activity;  
import android.content.Context;  
import android.view.Menu;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
  
public class MainActivity extends Activity {  
    Button enableButton,disableButton;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
        enableButton=(Button)findViewById(R.id.button1);  
        disableButton=(Button)findViewById(R.id.button2);  
          
        enableButton.setOnClickListener(new OnClickListener(){  
            public void onClick(View v){  
                WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);  
                wifi.setWifiEnabled(true);  
            }  
        });  
        disableButton.setOnClickListener(new OnClickListener(){  
            public void onClick(View v){  
                WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);  
                wifi.setWifiEnabled(false);  
            }  
        });  
    }  
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.activity_main, menu);  
        return true;  
    }  
  
}  
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Add Permission in AndroidManifest.xml

  • You need to add following permissions in AndroidManifest.xml file.
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<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />  
<uses-permission android:name="android.permission.INTERNET" />  
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>  
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Output:

 output of wifi

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