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Android: Getting the Broadcast Address of your Wifi connection

Sunday, May 1st, 2011

If you ever need to know the broadcast address of your wifi connection…

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private InetAddress getBroadcastAddress() throws IOException {
	WifiManager myWifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
	DhcpInfo myDhcpInfo = myWifiManager.getDhcpInfo();
	if (myDhcpInfo == null) {
		System.out.println("Could not get broadcast address");
		return null;
	}
	int broadcast = (myDhcpInfo.ipAddress & myDhcpInfo.netmask)
				| ~myDhcpInfo.netmask;
	byte[] quads = new byte[4];
	for (int k = 0; k < 4; k++)
	quads[k] = (byte) ((broadcast >> k * 8) & 0xFF);
	return InetAddress.getByAddress(quads);
}

Tags: Java, Wifi
Posted in Android | Comments Off

Android: Getting the Wifi Ip Address

Sunday, May 1st, 2011

This is how to get the ip address of your Android phone.

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WifiManager myWifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
WifiInfo myWifiInfo = myWifiManager.getConnectionInfo();
int ipAddress = myWifiInfo.getIpAddress();
System.out.println("WiFi address is " + android.text.format.Formatter.formatIpAddress(ipAddress));

Make sure you also add

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<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

to your Application Manifest.

Tags: Java, Wifi
Posted in Android | 3 Comments »

AS400 iSeries Java program completed with exit code 134

Monday, December 6th, 2010

Having spent a few days stuck on this issue.

FATAL ERROR in native method: Received NULL object reference
java.lang.Throwable
Java program completed with exit code 134

Most of the google hits talked about PTF’s not being up to day. For me the error was the jar file I referenced was not in /QIBM/Userdata/Java400/ext. Stupid rookie mistake I know but the test system had the file from a previous project so I didn’t even check it. I had the CLASSPATH set to a directory where the jar file was but despite this when we went live it didn’t work. I was suitably red faced but at least this may help you avoid the embarrassment,

Tags: AS400, iSeries, Java, Red Face
Posted in Computers, Software Development | Comments Off