Develop Reference

how to turn on wifi programatically in flutter and android?

I want to create app functionality to turn on WIFI programmatically.
In android wifi.setWifiEnabled method was deprecated.

First, you need to ask the permission in the manifest file
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
Then in the activity file, you can disable wifi
WifiManager wifiManager = (WifiManager) this.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(true);
wifiManager.setWifiEnabled(false);
boolean wifiEnabled = wifiManager.isWifiEnabled()

Android blacklist wifi bssid

I have a problem banning a specific bssid. I can see there is a class called WifiNative that was in api 19 but not able to access it:https://android.googlesource.com/platform/frameworks/base/+/kitkat-release/wifi/java/android/net/wifi/WifiNative.java
Is there any other way anyone knows of to do this? Maybe via JNI? Any android system libraries that can be used? c,c++?

WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
newWifiInfo = wifiManager.getConnectionInfo();
from there you can get the BSSID by doing
newWifiInfo.getBSSID()
then "blacklist" by turning off the wifi via
wifiManager.setWifiEnabled(false)
Also don't forget your permissions
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
If you want more control over your wifi state, you can use the following library to "sniff" your connection and other things
https://github.com/pwittchen/ReactiveNetwork

What does "mWifiServiceMessenger == null" exception in LogCat imply?

When getting a WifiManager System Service like this
WifiManager mainWifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
I have the following permissions in the Manifest file:
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
Eclipse LogCat logs an error
"mWifiServiceMessenger == null" [Tag: WifiManager]
Everything seems to work fine nevertheless. I do get an instance of WifiManager back. But the error is logged, also regardless of the Wifi state (enabled or disabled.
I would like to understand why this error is logged and what it does imply.

This error occurs when the device has the WiFi turned off. If the device can't get the WIFI_SERVICE.
Anyway not all the devices throw this error.
In your case it is posible that you're trying to get the WiFi service and if not you're using the cellular data.
It is thrown by WifiManager:
E/WifiManager: mWifiServiceMessenger == null

I had the same problem and I found the solution. You have to add CHANGE_WIFI_STATE permission in your manifest.
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

Get MAC Address Android Crashes APP

I'm trying to get MAC addres of Wifi network of Eclipse android emulator with this:
WifiManager wifiManager = (WifiManager) LoginActivity.this.getSystemService(WIFI_SERVICE);
WifiInfo wInfo = wifiManager.getConnectionInfo();
String macAddress = wInfo.getMacAddress();
System.out.println("HI");
System.out.println(macAddress);
This is the android manifest permissions
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
When the execution arrives to
System.out.println(macAddress);
The app crashes with java nullpointerexception and close it.
What are doing wrong? I have to add wifi conectivity to emulator?

The doc about WifiManager.getConnectionInfo() states that it :
Return dynamic information about the current Wi-Fi connection, if any
is active.
This means that in this case, you'd want to check whether your WifiInfo is not null and that your device is effectively connected to a Wi-Fi network. In the case of the emulator, the MAC address is always null, so you should make sure what you're outputting is valid.

Enabled using coding for use wireless network

I am new to android i stuck for using coding enable location and sectury in that use wireless network enabled so please tell mi how it's possible
thanks
priya naral

From what I gathered, you want to programmatically turn on Wi-Fi.
If so, first you need to add these to your AndroidManifest.xml:
<application>
.
.
.
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
</application>
Then you have the ability to use WifiManager, so your code would look something like the following, where this is your application Context:
WifiManager manager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
if(!manager.isWifiEnabled()){
manager.setWifiEnabled(true);
}