JAVA Android Internet Connectivity

This class checks for internet connection availability, speed and network type on your android phone.

For mobile network speeds, the network subtypes below are checked

1.  NETWORK_TYPE_1xRTT:
2.  NETWORK_TYPE_EDGE:    return false;   // ~ 50-100     -Kbps   
3.  NETWORK_TYPE_CDMA:    return false;   // ~ 14-64      -Kbps   
4.  NETWORK_TYPE_EVDO_0:  return true;    // ~ 400-1000   -Kbps
5.  NETWORK_TYPE_EVDO_A:  return true;    // ~ 600-1400   -Kbps
6.  NETWORK_TYPE_GPRS:    return false;   // ~ 100        -Kbps   
7.  NETWORK_TYPE_HSDPA:   return true;    // ~ 2000-1400  -Kbps
8.  NETWORK_TYPE_HSPA:    return true;    // ~ 700-1700   -Kbps
9.  NETWORK_TYPE_HSUPA:   return true;    // ~ 1000-2300  -Kbps
10. NETWORK_TYPE_UMTS:    return true;    // ~ 400-7000   -Kbps
11. NETWORK_TYPE_EHRPD:   return true;    // ~ 1000-2000  -Kbps   // API level 11
12. NETWORK_TYPE_EVDO_B:  return true;    // ~ 5000       -Kbps   // API level 9
13. NETWORK_TYPE_HSPAP:   return true;    // ~ 10000-20000-Kbps   // API level 13
14. NETWORK_TYPE_IDEN:    return false;   // ~ 25         -Kbps   // API level 8
15. NETWORK_TYPE_LTE:     return true;    // ~ 10000+     -Kbps   // API level 11
16. NETWORK_TYPE_UNKNOWN:                 // ~ Unknown

For WiFi and VPN speed calculation:

1. A file is downloaded from the internet.
2. Get download start time.
3. Calculate download time by subtracting download endTime from download startTime.
	double timeTakenMills = Math.floor(endTime[0] - startTime);  // time taken in milliseconds.
      	double timeTakenSecs = timeTakenMills / 1000;  // divide by 1000 to get time in seconds.
      	final int kilobytesPerSec = (int) Math.round(1024 / timeTakenSecs);  

4. Get the download speed by dividing the file size by time taken to download
      double speed = fileSize[0] / timeTakenMills;

Manifest
The following permissions will be required. Add them to your AndroidManifest.xml file.

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />

build.gradle
Add okhttp library to your dependencies in your build.gradle file.

dependencies {
    implementation 'com.squareup.okhttp:okhttp-urlconnection:2.0.0'
}

Examples in code:

Check connectivity to either WiFi or mobile connection.

// Check connectivity to either WiFi or mobile connection
if (InternetConnectivity.isConnectedToAnyNetwork(mContext)){
    // Run process requiring WiFi or mobile connection
    doSomething();

    // Check if connection is fast
    if (InternetConnectivity.isConnectionFast(mContext)){
	// Run heavy request requiring strong network connection
	doSomething();
    }
}

Check connectivity to mobile connection.

// Check connectivity to mobile connection
if (InternetConnectivity.isConnectedToMobileNetwork(mContext)){
    // Run process on mobile network
    doSomething();

    // Check if connection is fast
    if (InternetConnectivity.isConnectionFast(mContext)){
	// Run heavy request requiring strong network connection
	doSomething();
    }

    // Check mobile connection speed with subtype
    if (InternetConnectivity.isConnectionFast(ConnectivityManager.TYPE_MOBILE, TelephonyManager.NETWORK_TYPE_UNKNOWN)){
	// Throw UNKNOWN NETWORK exception
	doSomething();
    }
}

Check connectivity to WiFi connection.

// Check connectivity to WiFi connection
if (InternetConnectivity.isConnectedToWifiNetwork(mContext)){
    // Run process on WiFi connection - e.g. Heavy downloads, updates etc
    doSomething();

    // Check if connection is fast
    if (InternetConnectivity.isConnectionFast(mContext)){
	// Run heavy request requiring strong network connection
	doSomething();
    }


    // Check if connection is fast and return network information
    // Returns HashMap<String, String> with details (timeTakenMillis, timeTakenSecs, linkSpeedBps, linkSpeedKbps, linkSpeedMbps, testFileDownloadSpeed, testFileSize)
    String timeTakenMillis, timeTakenSecs, linkSpeedBps, linkSpeedKbps, linkSpeedMbps, testFileDownloadSpeed, testFileSize;
    boolean isFastNetwork;
    connectionSpeedInfo = InternetConnectivity.getWiFiConnectionSpeedInfo(mContext);
    //noinspection unused
    timeTakenMillis = connectionSpeedInfo.get("timeTakenMillis");
    timeTakenSecs = connectionSpeedInfo.get("timeTakenSecs");
    linkSpeedBps = connectionSpeedInfo.get("linkSpeedBps");
    linkSpeedKbps = connectionSpeedInfo.get("linkSpeedKbps");
    linkSpeedMbps = connectionSpeedInfo.get("linkSpeedMbps");
    testFileDownloadSpeed = connectionSpeedInfo.get("testFileDownloadSpeed");
    testFileSize = connectionSpeedInfo.get("testFileSize");
    isFastNetwork = Boolean.parseBoolean(connectionSpeedInfo.get("isFastNetwork"));
}

Check connectivity to VPN connection.

// Check connectivity to VPN connection
if (InternetConnectivity.isConnectedToVPNNetwork(mContext)){
    // Run process on WiFi connection - e.g. Heavy downloads, updates etc
    doSomething();

    // Check if connection is fast
    if (InternetConnectivity.isConnectionFast(mContext)){
	// Run heavy request requiring strong network connection
	doSomething();
    }

    // Check if connection is fast and return network information
    // Returns HashMap<String, String> with details (timeTakenMillis, timeTakenSecs, linkSpeedBps, linkSpeedKbps, linkSpeedMbps, testFileDownloadSpeed, testFileSize)
    String timeTakenMillis, timeTakenSecs, linkSpeedBps, linkSpeedKbps, linkSpeedMbps, testFileDownloadSpeed, testFileSize;
    boolean isFastNetwork;
    connectionSpeedInfo = InternetConnectivity.getVPNConnectionSpeedInfo(mContext);
    timeTakenMillis = connectionSpeedInfo.get("timeTakenMillis");
    timeTakenSecs = connectionSpeedInfo.get("timeTakenSecs");
    linkSpeedBps = connectionSpeedInfo.get("linkSpeedBps");
    linkSpeedKbps = connectionSpeedInfo.get("linkSpeedKbps");
    linkSpeedMbps = connectionSpeedInfo.get("linkSpeedMbps");
    testFileDownloadSpeed = connectionSpeedInfo.get("testFileDownloadSpeed");
    testFileSize = connectionSpeedInfo.get("testFileSize");
    isFastNetwork = Boolean.parseBoolean(connectionSpeedInfo.get("isFastNetwork"));
}

Android Application Example.

An android application with code examples named InternetConnectivityExample.zip has been included in this repository. It contains:

1. InternetConnectivity.class
2. Example code implementations
3. A basic network_security_config.xml file - could be used to configure network traffic like disabling clearTextTraffic to domains and subdomains.