如何在Android应用程序中使用3G连接而不是Wi-Fi？
我想连接3G连接，是否有任何示例代码连接到3G而不是Wi-Fi？
答案 0 :(得分：61)
/**
* 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;
}
这用于计算主机地址：
/**
* 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;
}
必须将以下权限添加到AndroidManifest.xml
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
它仅适用于Android 2.2及更高版本，在Nexus One和LG Optimus上测试，其他手机我不知道，因为ConnectivityMananger的某些方法是供应商特定的。 在15-20秒不活动后，移动网络将自动断开连接。
答案 1 :(得分：13)
T-Mobile“我的帐户”应用程序执行此操作，如果您连接到WiFi连接，它会告诉您他们的程序无法通过WiFi工作，然后询问用户是否要关闭WiFi连接。您选择“否”然后应用程序退出，如果您选择“是”，则应用程序将关闭您的WiFi连接，然后继续启动。
我认为这是一个很好的模型，它将确保您的应用程序不会通过WiFi运行，并允许用户决定是否要关闭WiFi。这种模式的一个改进是当用户离开你的应用程序时重新打开wifi。
我没有测试过以下代码，但它看起来应该可行（从here修改）
在清单中使用以下权限
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
这里有一些打开/关闭wifi的实际代码
private WifiManager wifiManager;
@Override
public void onCreate(Bundle icicle)
{
....................
wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
if(wifiManager.isWifiEnabled())
{
wifiManager.setWifiEnabled(false);
}
else
{
wifiManager.setWifiEnabled(true);
}
}
如果您不想沿着这条路走下去，看起来您可能会告诉手机您更愿意使用移动数据网络而不是无线网络。
Android ConnectivityManager提供了一个功能setNetworkPreference。如果您单击该链接，则无法记录此功能。我会讨论它，因为定义的常量似乎暗示你可以将它设置为TYPE_MOBILE或TYPE_WIFI并且还有一个DEFAULT_NETWORK_PREFERENCE常量定义为为0x00000001，与TYPE_WIFI相同。因此，请尝试通过调用
来访问ConnectivityManagerContext.getSystemService(Context.CONNECTIVITY_SERVICE);
然后尝试使用setNetworkPreference（）函数。
它似乎不需要清单中的任何权限，但它可能需要CHANGE_NETWORK_STATE权限或沿着这些行。
如果您使用setNetworkPreference函数，最好也将网络首选项设置回其原始值（从getNetworkPreference接收）
我希望这会有所帮助。
答案 2 :(得分：5)
我认为Java无法做到这一点。如果连接到无线网络，系统将关闭所有基于移动网络的通信。我认为您不能从您的程序启动3G连接。
答案 3 :(得分：3)
以下是适用于API 21+的代码（Lollipop，Marshmallow ..）。 我更喜欢将OkHttp与 Network.getSocketFactory（）一起使用，但 Network.openURLConnection（）也可以正常使用。
private void doTest()
{
display("Requesting CELLULAR network connectivity...");
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkRequest request = new NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET).build();
connectivityManager.requestNetwork(request, new ConnectivityManager.NetworkCallback()
{
/**
* Called when the framework connects and has declared a new network ready for use.
* This callback may be called more than once if the {@link Network} that is
* satisfying the request changes.
*
* This method will be called on non-UI thread, so beware not to use any UI updates directly.
*
* @param network The {@link Network} of the satisfying network.
*/
@Override
public void onAvailable(final Network network)
{
display("Got available network: " + network.toString());
try
{
final InetAddress address = network.getByName("navalclash.com");
display("Resolved host2ip: " + address.getHostName() + " -> " + address.getHostAddress());
}
catch (UnknownHostException e)
{
e.printStackTrace();
}
display("Do request test page from remote http server...");
if(okHttpClient == null)
{
okHttpClient = new OkHttpClient.Builder().socketFactory(network.getSocketFactory()).build();
}
Request request = new Request.Builder()
.url("http://navalclash.com")
.build();
try (Response response = okHttpClient.newCall(request).execute())
{
display("RESULT:\n" + response.body().string());
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
});
}
答案 4 :(得分：2)
使用连接管理器并根据需要设置网络首选项。
例如：
dataManager = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);
dataManager.setNetworkPreference(ConnectivityManager.TYPE_MOBILE);
答案 5 :(得分：1)
此应用程序激活3G和Wifi连接，优先考虑3G！ 非常有用http://www.redrails.com.br/2012/02/wireless-analyzer-for-android/
答案 6 :(得分：1)
受此票证中的代码启发并使用它的某些部分，这里是建立hipri mobile并使其保持运行的服务。
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.concurrent.atomic.AtomicBoolean;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo.State;
import android.os.IBinder;
import android.util.Log;
public class HipriService extends Service {
private AtomicBoolean enabledMobile = new AtomicBoolean(false);
public boolean enableMobileConnection() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
if (null == cm) {
Log.d(TAG, "ConnectivityManager is null, cannot try to force a mobile connection");
return false;
}
/*
* Don't do anything if we are connecting. On the other hands re-new
* connection if we are connected.
*/
State state = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE_HIPRI).getState();
Log.d(TAG, "TYPE_MOBILE_HIPRI network state: " + state);
if (0 == state.compareTo(State.CONNECTING))
return true;
/*
* Re-activate mobile connection in addition to other connection already
* activated
*/
int resultInt = cm.startUsingNetworkFeature(ConnectivityManager.TYPE_MOBILE, "enableHIPRI");
//Log.d(TAG, "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.e(TAG, "Wrong result of startUsingNetworkFeature, maybe problems");
return false;
}
if (0 == resultInt) {
Log.d(TAG, "No need to perform additional network settings");
return true;
}
return requestRouteToHost(this, Uploader.ServerAddress);
}
private Thread pingerThread = null;
private void startMobileConnection() {
enabledMobile.set(true);
pingerThread = new Thread(new Runnable() {
@Override
public void run() {
while (enabledMobile.get()) {
/*
* Renew mobile connection. No routing setup is needed. This
* should be moved to 3g monitoring service one day.
*/
enableMobileConnection();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// do nothing
}
}
}
});
pingerThread.start();
}
private void stopMobileConnection() {
enabledMobile.set(false);
disableMobileConnection();
pingerThread.interrupt();
pingerThread = null;
}
public void disableMobileConnection() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
cm.stopUsingNetworkFeature(ConnectivityManager.TYPE_MOBILE, "enableHIPRI");
}
public final static int inetAddressToInt(InetAddress inetAddress) {
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;
}
public final static InetAddress lookupHost(String hostname) {
try {
return InetAddress.getByName(hostname);
} catch (UnknownHostException e) {
return null;
}
}
private boolean requestRouteToHost(Context context, String hostname) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (null == cm) {
Log.d(TAG, "ConnectivityManager is null, cannot try to force a mobile connection");
return false;
}
/* Wait some time needed to connection manager for waking up */
try {
for (int counter = 0; enabledMobile.get() && counter < 30; counter++) {
State checkState = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE_HIPRI).getState();
Log.i(TAG, "Waiting for mobile data on. State " + checkState);
if (0 == checkState.compareTo(State.CONNECTED))
break;
Thread.sleep(1000);
}
} catch (InterruptedException e) {
//nothing to do
}
if (!enabledMobile.get()) {
Log.d(TAG, "Mobile data is turned off while waiting for routing.");
return false;
}
State checkState = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE_HIPRI).getState();
if (0 != checkState.compareTo(State.CONNECTED)) {
Log.e(TAG, "Mobile data is still turned off after 30 sec of waiting.");
return false;
}
Log.i(TAG, "Adding routing for " + hostname);
InetAddress inetAddress = lookupHost(hostname);
if (inetAddress == null) {
Log.e(TAG, "Failed to resolve " + hostname);
return false;
}
int hostAddress = inetAddressToInt(inetAddress);
boolean resultBool = cm.requestRouteToHost(ConnectivityManager.TYPE_MOBILE_HIPRI, hostAddress);
Log.d(TAG, "requestRouteToHost result: " + resultBool);
if (!resultBool)
Log.e(TAG, "Wrong requestRouteToHost result: expected true, but was false");
return resultBool;
}
@Override
public void onCreate() {
super.onCreate();
startMobileConnection();
}
@Override
public void onDestroy() {
stopMobileConnection();
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
}
以下是我在需要时开始/停止它的方法。请注意，它还会锁定cpu和wifi，以便在手机休眠时运行（仅限屏幕）。需要Wifi，因为我的应用程序是wifi和移动连接之间的桥梁。你可能不需要它。
public void startMobileData() {
if (!enabledMobile.get()) {
enabledMobile.set(true);
WifiManager wm = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiLock = wm.createWifiLock(WifiManager.WIFI_MODE_FULL, "Wifi Wakelock");
wifiLock.acquire();
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
partialLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "3G Wakelock");
partialLock.acquire();
startService(new Intent(this, HipriService.class));
}
}
public void stopMobileData() {
if (enabledMobile.get()) {
enabledMobile.set(false);
Log.i(TAG, "Disabled mobile data");
stopService(new Intent(this, HipriService.class));
if (partialLock != null) {
partialLock.release();
partialLock = null;
}
if (wifiLock != null) {
wifiLock.release();
wifiLock = null;
}
}
}
不要忘记向您的清单文件添加服务。
答案 7 :(得分：0)
@umka
答案 8 :(得分：0)
@Northern Captain的答案，DNS查找代码缺少一段代码。
这是一个有效的代码：
var jsonString = JSON.parse("{ \"application.data\":\"process\" }");