在我的android上,我使用WIFI和3gdata流量如何打开和关闭3g数据,因为它不是无限的…我只需要一个类/功能代码行,即可向我显示TelephonyManager.DATA_TRAFIC为enable = false；

解决方法:

这取决于您正在运行的Android版本.我开发的小部件为Take a look at my code.

您需要的代码行是

TelephonyManager telephonyManager = (TelephonyManager) context
            .getSystemService(Context.TELEPHONY_SERVICE);

    if (telephonyManager.getDataState() == TelephonyManager.DATA_CONNECTED) {
        isEnabled = true;
    } else {
        isEnabled = false;
    }

“旧版”方法适用于使用TelephonyManager的2.2之前的android版本.

// 2.2+
private void setMobileDataEnabled(Context context, boolean enabled) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException {
    final ConnectivityManager conman = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    final Class conmanClass = Class.forName(conman.getClass().getName());
    final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
    iConnectivityManagerField.setAccessible(true);
    final Object iConnectivityManager = iConnectivityManagerField.get(conman);
    final Class iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
    final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
    setMobileDataEnabledMethod.setAccessible(true);

    setMobileDataEnabledMethod.invoke(iConnectivityManager, enabled);
}

public static boolean isMobileDataConnected(Context context) {
    try {
        final ConnectivityManager conman = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        final Class conmanClass = Class.forName(conman.getClass().getName());
        final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
        iConnectivityManagerField.setAccessible(true);
        final Object iConnectivityManager = iConnectivityManagerField.get(conman);
        final Class iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
        final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("getMobileDataEnabled");
        setMobileDataEnabledMethod.setAccessible(true);

        return Boolean.valueOf(setMobileDataEnabledMethod.invoke(iConnectivityManager).toString());
    } catch (Exception e) {
        Log.e("NetSwitcher", e.toString());
    }
    return false;
}

// pre 2.2
public static void setMobileDataEnabledLegacy(Context context) {
    boolean isEnabled = false;
    Method dataConnSwitchmethod;
    Class telephonyManagerClass;
    Object ITelephonyStub;
    Class ITelephonyClass;

    TelephonyManager telephonyManager = (TelephonyManager) context
            .getSystemService(Context.TELEPHONY_SERVICE);

    if (telephonyManager.getDataState() == TelephonyManager.DATA_CONNECTED) {
        isEnabled = true;
    } else {
        isEnabled = false;
    }
    try {
        telephonyManagerClass = Class.forName(telephonyManager.getClass().getName());
        Method getITelephonyMethod = telephonyManagerClass.getDeclaredMethod("getITelephony");
        getITelephonyMethod.setAccessible(true);
        ITelephonyStub = getITelephonyMethod.invoke(telephonyManager);
        ITelephonyClass = Class.forName(ITelephonyStub.getClass().getName());

        if (isEnabled) {
            dataConnSwitchmethod = ITelephonyClass
                    .getDeclaredMethod("disableDataConnectivity");
        } else {
            dataConnSwitchmethod = ITelephonyClass
                    .getDeclaredMethod("enableDataConnectivity");
        }
        dataConnSwitchmethod.setAccessible(true);
        dataConnSwitchmethod.invoke(ITelephonyStub);
    } catch (Exception e) {
        Log.e("NetSwitcher", e.toString());
    }
}