Android:在Android设备上检查3G或Wifi网络是否开启或可用

时间:2012-07-05 11:19:29

标签: android networking wifi 3g

如何以编程方式在Android设备上检查该网络是否可用,当我们尝试连接网络(例如Wifi& amp;)时,它会抛出消息或Toast消息。 3G。

10 个答案:

答案 0 :(得分:47)

要检查网络,即3G或WiFi是否可用,我们可以在开始活动之前使用以下方法进行验证。

ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);

//For 3G check
boolean is3g = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
            .isConnectedOrConnecting();
//For WiFi Check
boolean isWifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
            .isConnectedOrConnecting();

System.out.println(is3g + " net " + isWifi);

if (!is3g && !isWifi) 
{ 
Toast.makeText(getApplicationContext(),"Please make sure your Network Connection is ON ",Toast.LENGTH_LONG).show();
} 
 else 
{ 
        " Your method what you want to do "
} 

希望这会对某人有所帮助。

答案 1 :(得分:6)

final ConnectivityManager connMgr = (ConnectivityManager)
    this.getSystemService(Context.CONNECTIVITY_SERVICE);

    final android.net.NetworkInfo wifi =
    connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

    final android.net.NetworkInfo mobile =
    connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

    if( wifi.isAvailable() && wifi.getDetailedState() == DetailedState.CONNECTED){
        Toast.makeText(this, "Wifi" , Toast.LENGTH_LONG).show();
    }
    else if( mobile.isAvailable() && mobile.getDetailedState() == DetailedState.CONNECTED ){
        Toast.makeText(this, "Mobile 3G " , Toast.LENGTH_LONG).show();
    }
    else
    {   
        Toast.makeText(this, "No Network " , Toast.LENGTH_LONG).show();
    }

此代码检查您是否使用wifi或3g或没有,在wifi打开但没有连接到网络的情况下或3g有信号问题它检测到此详细信息,并使用DetailedStates

答案 2 :(得分:4)

您可以使用此方法检查您的互联网连接是否为 2G,3G或4G

public String getNetworkClass(Context context) {
    TelephonyManager mTelephonyManager = (TelephonyManager)
            context.getSystemService(Context.TELEPHONY_SERVICE);
    int networkType = mTelephonyManager.getNetworkType();
    switch (networkType) {
        case TelephonyManager.NETWORK_TYPE_GPRS:
        case TelephonyManager.NETWORK_TYPE_EDGE:
        case TelephonyManager.NETWORK_TYPE_CDMA:
        case TelephonyManager.NETWORK_TYPE_1xRTT:
        case TelephonyManager.NETWORK_TYPE_IDEN:
            return "2G";
        case TelephonyManager.NETWORK_TYPE_UMTS:
        case TelephonyManager.NETWORK_TYPE_EVDO_0:
        case TelephonyManager.NETWORK_TYPE_EVDO_A:
        case TelephonyManager.NETWORK_TYPE_HSDPA:
        case TelephonyManager.NETWORK_TYPE_HSUPA:
        case TelephonyManager.NETWORK_TYPE_HSPA:
        case TelephonyManager.NETWORK_TYPE_EVDO_B:
        case TelephonyManager.NETWORK_TYPE_EHRPD:
        case TelephonyManager.NETWORK_TYPE_HSPAP:
            return "3G";
        case TelephonyManager.NETWORK_TYPE_LTE:
            return "4G";
        default:
            return "Unknown";
    }
}

使用以下方法,您可以检查互联网是否可用,并确定您是通过移动网络还是WiFi 访问互联网:

public String getNetworkType(Context context){
    String networkType = null;
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = connectivityManager.getActiveNetworkInfo();
    if (activeNetwork != null) { // connected to the internet
        if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                networkType = "WiFi";
        } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
            networkType = "Mobile";
        }
    } else {
        // not connected to the internet
    }
    return networkType;
}

答案 3 :(得分:3)

这项工作对我来说

NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();   
String name networkInfo.getTypeName();  

答案 4 :(得分:2)

Rahul Baradia的回答包括manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE),并且已被弃用。

以下是针对最新Android SDK的改进解决方案。

ConnectivityManager connManager = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
        boolean is3gEnabled = false;
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            Network[] networks = connManager.getAllNetworks();
            for(Network network: networks)
            {
                NetworkInfo info = connManager.getNetworkInfo(network);
                if(info!=null) {
                    if (info.getType() == ConnectivityManager.TYPE_MOBILE) {
                        is3gEnabled = true;
                        break;
                    }
                }
            }
        }
        else
        {
            NetworkInfo mMobile = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
            if(mMobile!=null)
                is3gEnabled = true;
        }

答案 5 :(得分:1)

将以下代码用作 NetworkChecker.java & 在代码中重复使用

package das.soumyadip.util;

import android.net.ConnectivityManager;
import android.util.Log;

public class NetworkChecker {
    private final static String TAG = "NwtworkChecker";

    public static boolean isNetworkConnected(
            final ConnectivityManager connectivityManager) {
        boolean val = false;

        Log.d(TAG, "Checking for Mobile Internet Network");
        final android.net.NetworkInfo mobile = connectivityManager
                .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        if (mobile.isAvailable() && mobile.isConnected()) {
            Log.i(TAG, "Found Mobile Internet Network");
            val = true;
        } else {
            Log.e(TAG, "Mobile Internet Network not Found");
        }

        Log.d(TAG, "Checking for WI-FI Network");
        final android.net.NetworkInfo wifi = connectivityManager
                .getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        if (wifi.isAvailable() && wifi.isConnected()) {
            Log.i(TAG, "Found WI-FI Network");
            val = true;
        } else {
            Log.e(TAG, "WI-FI Network not Found");
        }

        return val;
    }
}

答案 6 :(得分:1)

        // TODO Auto-generated method stub
        ConnectivityManager connMgr =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();

        final android.net.NetworkInfo mobile = connectivityManager
                .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        if (mobile.isAvailable() && mobile.isConnected()) {
            Log.i(TAG, "Found Mobile Internet Network");
            val = true;
        }
        // Checks the user prefs and the network connection. Based on the result, decides
        // whether
        // to refresh the display or keep the current display.
        // If the userpref is Wi-Fi only, checks to see if the device has a Wi-Fi connection.
        if (WIFI.equals(sPref) && networkInfo != null
                && networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
            // If device has its Wi-Fi connection, sets refreshDisplay
            // to true. This causes the display to be refreshed when the user
            // returns to the app.
            refreshDisplay = true;
            Toast.makeText(context, R.string.wifi_connected, Toast.LENGTH_SHORT).show();

            // If the setting is ANY network and there is a network connection
            // (which by process of elimination would be mobile), sets refreshDisplay to true.
        }

}
        else if (ANY.equals(sPref) && networkInfo != null) {
            refreshDisplay = true;

            // Otherwise, the app can't download content--either because there is no network
            // connection (mobile or Wi-Fi), or because the pref setting is WIFI, and there
            // is no Wi-Fi connection.
            // Sets refreshDisplay to false.
        } else {
            refreshDisplay = false;
            Toast.makeText(context, R.string.lost_connection, Toast.LENGTH_SHORT).show();
        }

答案 7 :(得分:1)

我们可以使用 ConnectivityManager Class 获取与网络相关的任何信息。

当网络连接更改时,它还会通知应用程序。通过调用

获取此类的实例

此课程的主要职责是:

      
  1. 监控网络连接(Wi-Fi,GPRS,UMTS等)
  2.   
  3. 网络连接更改时发送广播意图
  4.   
  5. 连接到网络时尝试“故障转移”到另一个网络   失去了
  6.   
  7. 提供允许应用程序查询粗粒度或细粒度的API   可用网络的状态
  8.   
  9. 提供一个API,允许应用程序为其数据请求和选择网络   流量
  10.  

    GetNetworkInfo函数返回有关特定网络类型的状态信息。

    此方法要求调用者持有权限

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    
         /**
         * Checks the type of data connection that is currently available on the device.
         *
         * @return <code>ConnectivityManager.TYPE_*</code> as a type of internet connection on the
         *This method does not support multiple connected networks
         *             of the same type.
         * device. Returns -1 in case of error or none of
         * <code>ConnectivityManager.TYPE_*</code> is found.
         **/
    

    -

    public static int getDataConnectionType(Context ctx) {
    
            ConnectivityManager connectivityManager = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
    
            if (connectivityManager != null && connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE) != null) {
                if (connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnected()) {
                    return ConnectivityManager.TYPE_MOBILE;
                } else if (connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnected()) {
                    return ConnectivityManager.TYPE_WIFI;
                } else
                    return -1;
            } else
                return -1;
        }
    

答案 8 :(得分:0)

在上面没有任何代码中,我看到检查getNetworkInfo()是否返回null,这是在不支持所请求的网络类型时根据文档发生的。这表明在没有3g的设备上,应用程序将因空指针异常而崩溃。

答案 9 :(得分:0)

public boolean isInternetAvailable(Context context) {
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null) { // connected to the internet
        if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
            // connected to wifi
            return true;

        } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
            // connected to the mobile provider's data plan
            return true;
        }
    } else {
        // not connected to the internet
        return false;
    }
    return false;
}