How to use 3G Connection in Android Application instead of Wi-fi?

Question

How to use 3G Connection in Android Application instead of Wi-fi?

I want to connect a 3G connection, is there any sample code to connect to 3G instead of Wi-fi?

Answer 1

/**  * Enable mobile connection for a specific address  * @param context a Context (application or activity)  * @param address the address to enable  * @return true for success, else false  */ private boolean forceMobileConnectionForAddress(Context context, String address) {     ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);     if (null == connectivityManager) {         Log.debug(TAG_LOG, "ConnectivityManager is null, cannot try to force a mobile connection");         return false;     }      //check if mobile connection is available and connected     State state = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE_HIPRI).getState();     Log.debug(TAG_LOG, "TYPE_MOBILE_HIPRI network state: " + state);     if (0 == state.compareTo(State.CONNECTED) || 0 == state.compareTo(State.CONNECTING)) {         return true;     }      //activate mobile connection in addition to other connection already activated     int resultInt = connectivityManager.startUsingNetworkFeature(ConnectivityManager.TYPE_MOBILE, "enableHIPRI");     Log.debug(TAG_LOG, "startUsingNetworkFeature for enableHIPRI result: " + resultInt);      //-1 means errors     // 0 means already enabled     // 1 means enabled     // other values can be returned, because this method is vendor specific     if (-1 == resultInt) {         Log.error(TAG_LOG, "Wrong result of startUsingNetworkFeature, maybe problems");         return false;     }     if (0 == resultInt) {         Log.debug(TAG_LOG, "No need to perform additional network settings");         return true;     }      //find the host name to route     String hostName = StringUtil.extractAddressFromUrl(address);     Log.debug(TAG_LOG, "Source address: " + address);     Log.debug(TAG_LOG, "Destination host address to route: " + hostName);     if (TextUtils.isEmpty(hostName)) hostName = address;      //create a route for the specified address     int hostAddress = lookupHost(hostName);     if (-1 == hostAddress) {         Log.error(TAG_LOG, "Wrong host address transformation, result was -1");         return false;     }     //wait some time needed to connection manager for waking up     try {         for (int counter=0; counter<30; counter++) {             State checkState = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE_HIPRI).getState();             if (0 == checkState.compareTo(State.CONNECTED))                 break;             Thread.sleep(1000);         }     } catch (InterruptedException e) {         //nothing to do     }     boolean resultBool = connectivityManager.requestRouteToHost(ConnectivityManager.TYPE_MOBILE_HIPRI, hostAddress);     Log.debug(TAG_LOG, "requestRouteToHost result: " + resultBool);     if (!resultBool)         Log.error(TAG_LOG, "Wrong requestRouteToHost result: expected true, but was false");      return resultBool; } 

And this for calculate host address:

/**  * This method extracts from address the hostname  * @param url eg. http://some.where.com:8080/sync  * @return some.where.com  */ public static String extractAddressFromUrl(String url) {     String urlToProcess = null;      //find protocol     int protocolEndIndex = url.indexOf("://");     if(protocolEndIndex>0) {         urlToProcess = url.substring(protocolEndIndex + 3);     } else {         urlToProcess = url;     }      // If we have port number in the address we strip everything     // after the port number     int pos = urlToProcess.indexOf(':');     if (pos >= 0) {         urlToProcess = urlToProcess.substring(0, pos);     }      // If we have resource location in the address then we strip     // everything after the '/'     pos = urlToProcess.indexOf('/');     if (pos >= 0) {         urlToProcess = urlToProcess.substring(0, pos);     }      // If we have ? in the address then we strip     // everything after the '?'     pos = urlToProcess.indexOf('?');     if (pos >= 0) {         urlToProcess = urlToProcess.substring(0, pos);     }     return urlToProcess; }  /**  * Transform host name in int value used by {@link ConnectivityManager.requestRouteToHost}  * method  *  * @param hostname  * @return -1 if the host doesn't exists, elsewhere its translation  * to an integer  */ private static int lookupHost(String hostname) {     InetAddress inetAddress;     try {         inetAddress = InetAddress.getByName(hostname);     } catch (UnknownHostException e) {         return -1;     }     byte[] addrBytes;     int addr;     addrBytes = inetAddress.getAddress();     addr = ((addrBytes[3] & 0xff) << 24)             | ((addrBytes[2] & 0xff) << 16)             | ((addrBytes[1] & 0xff) << 8 )             |  (addrBytes[0] & 0xff);     return addr; } 

And following permission must be added to AndroidManifest.xml

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

It works only with android 2.2 and above, tested on both Nexus One and on LG Optimus, other phones I don't know because some method of ConnectivityMananger are vendor-specific. After 15-20 seconds of inactivity, mobile network is automatically disconnected.