Holding and releasing WiFi wake locks in android.

wifi-wake-lock-android

// create a class member variable.
WifiManager.WifiLock mWifiLock = null;


/***
* Calling this method will aquire the lock on wifi. This is avoid wifi
* from going to sleep as long as <code>releaseWifiLock</code> method is called.
**/
private void holdWifiLock() {
	WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
		
	if( mWifiLock == null )
		mWifiLock = wifiManager.createWifiLock(WifiManager.WIFI_MODE_FULL, TAG);
		
	mWifiLock.setReferenceCounted(false);

	if( !mWifiLock.isHeld() )
		mWifiLock.acquire();
}
	
/***
* Calling this method will release if the lock is already help. After this method is called,
* the Wifi on the device can goto sleep.
**/
private void releaseWifiLock() {
		
	if( mWifiLock == null )
		Log.w(TAG, "#releaseWifiLock mWifiLock was not created previously");
		
	if( mWifiLock != null && mWifiLock.isHeld() ){
		mWifiLock.release();
		//mWifiLock = null;
	}
		
}