Android--网络连接判断

1）判断是否有网络连接

public boolean isNetworkConnected(Context context) {  
    if (context != null) {  
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context  
                .getSystemService(Context.CONNECTIVITY_SERVICE);  
        NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();  
        if (mNetworkInfo != null) {  
            return mNetworkInfo.isAvailable();  
        }  
    }  
    return false;  
}

2）判断WIFI网络是否可用

public boolean isWifiConnected(Context context) {  
    if (context != null) {  
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context  
                .getSystemService(Context.CONNECTIVITY_SERVICE);  
        NetworkInfo mWiFiNetworkInfo = mConnectivityManager  
                .getNetworkInfo(ConnectivityManager.TYPE_WIFI);  
        if (mWiFiNetworkInfo != null) {  
            return mWiFiNetworkInfo.isAvailable();  
        }  
    }  
    return false;  
}

3）判断MOBILE网络是否可用

public boolean isMobileConnected(Context context) {  
    if (context != null) {  
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context  
                .getSystemService(Context.CONNECTIVITY_SERVICE);  
        NetworkInfo mMobileNetworkInfo = mConnectivityManager  
                .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);  
        if (mMobileNetworkInfo != null) {  
            return mMobileNetworkInfo.isAvailable();  
        }  
    }  
    return false;  
}

4）获取当前网络连接的类型信息

public static int getConnectedType(Context context) {  
    if (context != null) {  
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context  
                .getSystemService(Context.CONNECTIVITY_SERVICE);  
        NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();  
        if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {  
            return mNetworkInfo.getType();  
        }  
    }  
    return -1;  
}

原文链接： http://www.cnblogs.com/qingblog/archive/2012/07/19/2598983.html