Android studio network info

How to Check Internet Connection in Android with No Internet Connection Dialog?

Hello geeks, today we are going to learn that how we can add the functionality of Internet Alert to our application. You have definitely seen in almost all applications that when data is turned off or application is not able to get Internet then it pops up a message of “No Internet Connection” and then again it is connected to data is displays message as “Back Online’ or “Internet in connected”, we are going to implement the same in our application.

Goals/purposes of Internet Alert:

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• To inform the user that he/she is not connected to the network.
• To stop all internet-related activities or services in the application.

What we are going to build in this article?

Here, we will be creating a button. Whenever the user will press the button message of Internet Connectivity will be displayed. Note that we are going to implement this application using Java language. A sample video is given below to get an idea about what we are going to do in this article.

Step by Step Implementation

Step 1: Creating a new project

If you don’t know how to create a new project in Android Studio then you can refer to How to Create/Start a New Project in Android Studio?

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Android check internet connection

In this blog, I’ll show how to check internet connection in android programmatically. While we are developing a professional app, you may need to check internet available or not. For example, while you are calling APIs you may need to check internet connection several times in an app. In this example, we’ll learn how we can check internet connections any place and anywhere.

I’m going to create a demo application, This app will automatically detect the internet changes using an internet connection listener. For the demonstration, I’ll create a sample app that app will capable of continuously check internet connection with android. So let started.

Create Android Project

Let move to Android Studio, and create a fresh project with some default template. We are going to use java 1.8 stuff in our project so lets set java version in app build.gradle file

Add ACCESS_NETWORK_STATE permission in Manifest

For detecting network permission we required some permission so let open the AndroidManifest and add below permission.

Write a ConnectivityProvider interface

I’m going to write complete solution for check internet connection for pre and post LOLLIPOP devices solution in a single interface. Please have a look

Extend ConnectivityProvider interface

Now create a abstract class named ConnectivityProviderBaseImpl which extends ConnectivityProvider interface, like below

Write a actual implementation of ConnectivityProvider

Let’s create a NetWorkManger class

In this class we have one live data object which hold the internet state, It can be accessible threw out the application.

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Android — Network Connection

Android lets your application connect to the internet or any other local network and allows you to perform network operations.

A device can have various types of network connections. This chapter focuses on using either a Wi-Fi or a mobile network connection.

Checking Network Connection

Before you perform any network operations, you must first check that are you connected to that network or internet e.t.c. For this android provides ConnectivityManager class. You need to instantiate an object of this class by calling getSystemService() method. Its syntax is given below −

Once you instantiate the object of ConnectivityManager class, you can use getAllNetworkInfo method to get the information of all the networks. This method returns an array of NetworkInfo. So you have to receive it like this.

The last thing you need to do is to check Connected State of the network. Its syntax is given below −

Apart from this connected states, there are other states a network can achieve. They are listed below −

Sr.No	State
1	Connecting
2	Disconnected
3	Disconnecting
4	Suspended
5	Unknown

Performing Network Operations

After checking that you are connected to the internet, you can perform any network operation. Here we are fetching the html of a website from a url.

Android provides HttpURLConnection and URL class to handle these operations. You need to instantiate an object of URL class by providing the link of website. Its syntax is as follows −

After that you need to call openConnection method of url class and receive it in a HttpURLConnection object. After that you need to call the connect method of HttpURLConnection class.

And the last thing you need to do is to fetch the HTML from the website. For this you will use InputStream and BufferedReader class. Its syntax is given below −

Apart from this connect method, there are other methods available in HttpURLConnection class. They are listed below −

This method releases this connection so that its resources may be either reused or closed

This method returns the request method which will be used to make the request to the remote HTTP server

This method returns response code returned by the remote HTTP server

This method Sets the request command which will be sent to the remote HTTP server

This method returns whether this connection uses a proxy server or not

Example

The below example demonstrates the use of HttpURLConnection class. It creates a basic application that allows you to download HTML from a given web page.

To experiment with this example, you need to run this on an actual device on which wifi internet is connected .

Sr.No	Method & description
1

Steps	Description
1	You will use Android studio IDE to create an Android application under a package com.tutorialspoint.myapplication.
2	Modify src/MainActivity.java file to add Activity code.
4	Modify layout XML file res/layout/activity_main.xml add any GUI component if required.
6	Modify AndroidManifest.xml to add necessary permissions.
7	Run the application and choose a running android device and install the application on it and verify the results.

Here is the content of src/MainActivity.java.

Here is the content of activity_main.xml.

Here is the content of Strings.xml.

Here is the content of AndroidManifest.xml

Let’s try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project’s activity files and click Run icon from the tool bar. Before starting your application, Android studio will display following window to select an option where you want to run your Android application.

Select your mobile device as an option and then check your mobile device which will display following screen −

Now just click on button, It will check internet connection as well as it will download image.

Out would be as follows and it has fetch the logo from internet.

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Monitor Network Requests and Responses on Android Studio

Dec 21, 2017 · 4 min read

Android Studio 3.0 has an improved Android Profiler. One nice addition in the profiler tool is that the network inspector added to Network section. Using that now we can see the network traffic originating from app in debug and see the responses as well. Those who were using Charles Proxy or similar tool will easily realise how convenient it is. We can get rid of one tool* and no more annoying HTTP proxy configuring and removing configuration after usage.

But there are few cat c hes. First thing is it will work only if you are using HttpURLConnection or OkHttp for network calls in your app. If you are using some other libraries for network request, probably you’ll get the following message on Network profiler

“Network Profiling Data Unavailable: There is no information for the network traffic you’ve selected.”

Second issue that you may face is that you might not be able to see the network request and response in all of your devices / emulators. You’ll need a device with API 26(Android 8.0) or above. Which is a serious issue for most of the developers. Android 8.0 is the latest release, and there are only very few actual devices running that. Many flagships are still awaiting Oreo update. Simulators are here to help. But how many of us really use AVDs? I personally don’t like it. They are still very slow(Definitely improved a lot in last few years)

Now let’s see how we can actually see the request-response in Android Studio and what are the things available in that

You’ll be familiar with the following Android Profiler window which sits normally at the bottom of Android Studio. And you’ll be using it once in a while or daily.

It have different profiler outputs like CPU, Memory, Network etc. Click on that network output which shows a blue and kind of orange spikes. It will expand to something like this.

The blue and orange spikes indicate received and send data respectively. So if you have a series of calls going on these spikes will be continuous. To see data that has been transferred between app and server. Select a particular region in the spike area. You can do this by dragging from start to end of the range. You’ll see something like this after selecting the area.

Here you can see a table below the spikes, thats the place where it lists the api calls happened between the selected range. On the right side the request response data, header etc can be inspected. In the above example name of the api is shown as one, because I have used a dummy api for this and the api was something like /posts/1.

I have tried to look into the network traffic generated from a webview. Profiler gave the default unavailable error message. I haven’t checked whether there are any tweaks to make it work. But my best guess is that it wont’t be showing data transfer originated from webviews. I will be updating that also when I have confirmation on that.

When Android Studio 3 was released the network monitor had the options only to view network responses and response headers. But no way to see the request params. But it is now available in the canary channel. Following is the screenshot of the above api response monitor example in Android Studio Canary 8 with request param option

So you might be wondering will it work only for API calls, or work with other web resources as well. I have tried monitoring the request and responses of image loading through some of the famous image loading libraries like Picasso, Glide, Fresco etch. Read more about it here.

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Network Info. State Class

Definition

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

This class is obsoleted in this android platform

Coarse-grained network state.

Remarks

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Properties

Returns the runtime class of this Object .

(Inherited from Object) Connected Connecting DeclaringClass

Returns the Class object corresponding to this enum constant’s enum type.

(Inherited from Enum) Disconnected Disconnecting Handle

The handle to the underlying Android instance.

(Inherited from Object) JniIdentityHashCode (Inherited from Object) JniPeerMembers PeerReference (Inherited from Object) Suspended ThresholdClass

This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.

(Inherited from Enum) ThresholdType

This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.

(Inherited from Enum) Unknown

Methods

(Inherited from Enum) CompareTo(Object)

Compares this enum with the specified object for order.

(Inherited from Enum) Dispose() (Inherited from Object) Dispose(Boolean) (Inherited from Object) Equals(Object)

Returns true if the specified object is equal to this enum constant.

(Inherited from Enum) GetHashCode()

Returns a hash code for this enum constant.

(Inherited from Enum) JavaFinalize()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

(Inherited from Object) Name()

Returns the name of this enum constant, exactly as declared in its enum declaration.

(Inherited from Enum) Notify()

Wakes up a single thread that is waiting on this object’s monitor.

(Inherited from Object) NotifyAll()

Wakes up all threads that are waiting on this object’s monitor.

(Inherited from Object) Ordinal()

Returns the ordinal of this enumeration constant (its position in its enum declaration, where the initial constant is assigned an ordinal of zero).

(Inherited from Enum) SetHandle(IntPtr, JniHandleOwnership)

Sets the Handle property.

(Inherited from Object) ToArray () (Inherited from Object) ToString()

Returns a string representation of the object.

(Inherited from Object) UnregisterFromRuntime() (Inherited from Object) ValueOf(String) Values() Wait()

Causes the current thread to wait until another thread invokes the java.lang.Object#notify() method or the java.lang.Object#notifyAll() method for this object.

(Inherited from Object) Wait(Int64)

Causes the current thread to wait until another thread invokes the java.lang.Object#notify() method or the java.lang.Object#notifyAll() method for this object.

(Inherited from Object) Wait(Int64, Int32)

Causes the current thread to wait until another thread invokes the java.lang.Object#notify() method or the java.lang.Object#notifyAll() method for this object.

(Inherited from Object)

Explicit Interface Implementations

IJavaPeerable.Disposed()	(Inherited from Object)
IJavaPeerable.DisposeUnlessReferenced()	(Inherited from Object)
IJavaPeerable.Finalized()	(Inherited from Object)
IJavaPeerable.JniManagedPeerState	(Inherited from Object)
IJavaPeerable.SetJniIdentityHashCode(Int32)	(Inherited from Object)
IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates)	(Inherited from Object)
IJavaPeerable.SetPeerReference(JniObjectReference)	(Inherited from Object)

Extension Methods

Performs an Android runtime-checked type conversion.

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