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![Android wifi](https://mail.wikitechy.com/cdn/tutorials/android/wifi-in-android.gif)
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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.
- 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.
![android wifi](https://mail.wikitechy.com/cdn/tutorials/android/android-wifi.gif)
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
<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
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.
<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](https://mail.wikitechy.com/cdn/tutorials/android/wifioutput1.png)