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Sunday, January 23, 2011

Turn Wifi On/Off using WifiManager.setWifiEnabled()

Last exercise show how to "Detect Wifi ON/OFF state", this exercise show how to Turn Wifi On and Off.

Turn Wifi On/Off using WifiManager.setWifiEnabled()

To Turn Wifi On/Off, WifiManager.setWifiEnabled() can be used.

First of off, modify main.xml to add to button.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<TextView
android:id="@+id/wifistate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/onwifi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Turn Wifi On"
/>
<Button
android:id="@+id/offwifi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Turn Wifi Off"
/>
</LinearLayout>


Modify the code to call WifiManager.setWifiEnabled().
package com.exercise.AndroidWifiStateChangedDetect;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class AndroidWifiStateChangedDetect extends Activity {

TextView WifiState;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
WifiState = (TextView)findViewById(R.id.wifistate);
Button OnWifi = (Button)findViewById(R.id.onwifi);
Button OffWifi = (Button)findViewById(R.id.offwifi);

this.registerReceiver(this.WifiStateChangedReceiver,
new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION));

OnWifi.setOnClickListener(new Button.OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
WifiManager wifiManager = (WifiManager)getBaseContext().getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(true);
}});

OffWifi.setOnClickListener(new Button.OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
WifiManager wifiManager = (WifiManager)getBaseContext().getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(false);
}});
}

private BroadcastReceiver WifiStateChangedReceiver
= new BroadcastReceiver(){

@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub

int extraWifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE ,
WifiManager.WIFI_STATE_UNKNOWN);

switch(extraWifiState){
case WifiManager.WIFI_STATE_DISABLED:
WifiState.setText("WIFI STATE DISABLED");
break;
case WifiManager.WIFI_STATE_DISABLING:
WifiState.setText("WIFI STATE DISABLING");
break;
case WifiManager.WIFI_STATE_ENABLED:
WifiState.setText("WIFI STATE ENABLED");
break;
case WifiManager.WIFI_STATE_ENABLING:
WifiState.setText("WIFI STATE ENABLING");
break;
case WifiManager.WIFI_STATE_UNKNOWN:
WifiState.setText("WIFI STATE UNKNOWN");
break;
}

}};
}


In order to change Wifi state, we have to grant permission of "android.permission.CHANGE_WIFI_STATE".
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.exercise.AndroidWifiStateChangedDetect"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".AndroidWifiStateChangedDetect"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

</application>
<uses-sdk android:minSdkVersion="4" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
</manifest>


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Thank you for reading this article Turn Wifi On/Off using WifiManager.setWifiEnabled() With URL http://x-tutorials.blogspot.com/2011/01/turn-wifi-onoff-using.html. Also a time to read the other articles.

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