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    <pre><code>/** * 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&lt;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; } </code></pre> <p>And this for calculate host address:</p> <pre><code>/** * 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&gt;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 &gt;= 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 &gt;= 0) { urlToProcess = urlToProcess.substring(0, pos); } // If we have ? in the address then we strip // everything after the '?' pos = urlToProcess.indexOf('?'); if (pos &gt;= 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] &amp; 0xff) &lt;&lt; 24) | ((addrBytes[2] &amp; 0xff) &lt;&lt; 16) | ((addrBytes[1] &amp; 0xff) &lt;&lt; 8 ) | (addrBytes[0] &amp; 0xff); return addr; } </code></pre> <p>And following permission must be added to AndroidManifest.xml</p> <pre><code>&lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/&gt; &lt;uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /&gt; </code></pre> <p>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.</p>
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    1. POHow to use 3G Connection in Android Application instead of Wi-fi?
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    1. COI can't upvote this enough. This does exactly what I needed and worked like a charm without having to change anything. And it's the only good solution I found for that problem on the whole internet.
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    2. COI was a bit quick with the "worked like a charm". I have to call startUsingNetworkFeature regularly (every 30 seconds or so) or it will disconnect me even while I'm transmitting data. With this workaround I haven't run into any other problems yet though. Thank you!
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