Android Wifi

Android Wifi Example

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 .

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

1. <RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="match_parent"  
5.     tools:context=".MainActivity" >  
6.   
7.     <Button  
8.         android:id="@+id/button1"  
9.         android:layout_width="wrap_content"  
10.         android:layout_height="wrap_content"  
11.         android:layout_alignParentLeft="true"  
12.         android:layout_alignParentTop="true"  
13.         android:layout_marginLeft="76dp"  
14.         android:layout_marginTop="67dp"  
15.         android:text="Enable Wifi" />  
16.   
17.     <Button  
18.         android:id="@+id/button2"  
19.         android:layout_width="wrap_content"  
20.         android:layout_height="wrap_content"  
21.         android:layout_alignLeft="@+id/button1"  
22.         android:layout_below="@+id/button1"  
23.         android:layout_marginTop="44dp"  
24.         android:text="Disable Wifi" />  
25.   
26. </RelativeLayout>  

---

Activity class

File: MainActivity.java

1. package com.example.wifi;  
2.   
3. import android.net.wifi.WifiManager;  
4. import android.os.Bundle;  
5. import android.app.Activity;  
6. import android.content.Context;  
7. import android.view.Menu;  
8. import android.view.View;  
9. import android.view.View.OnClickListener;  
10. import android.widget.Button;  
11.   
12. public class MainActivity extends Activity {  
13.     Button enableButton,disableButton;  
14.     @Override  
15.     protected void onCreate(Bundle savedInstanceState) {  
16.         super.onCreate(savedInstanceState);  
17.         setContentView(R.layout.activity_main);  
18.           
19.         enableButton=(Button)findViewById(R.id.button1);  
20.         disableButton=(Button)findViewById(R.id.button2);  
21.           
22.         enableButton.setOnClickListener(new OnClickListener(){  
23.             public void onClick(View v){  
24.                 WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);  
25.                 wifi.setWifiEnabled(true);  
26.             }  
27.         });  
28.         disableButton.setOnClickListener(new OnClickListener(){  
29.             public void onClick(View v){  
30.                 WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);  
31.                 wifi.setWifiEnabled(false);  
32.             }  
33.         });  
34.     }  
35.   
36.     @Override  
37.     public boolean onCreateOptionsMenu(Menu menu) {  
38.         // Inflate the menu; this adds items to the action bar if it is present.  
39.         getMenuInflater().inflate(R.menu.activity_main, menu);  
40.         return true;  
41.     }  
42.   
43. }  

Add Permission in AndroidManifest.xml

You need to add following permissions in AndroidManifest.xml file.

1. <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />  
2. <uses-permission android:name="android.permission.INTERNET" />  
3. <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>