Android send get request

Android OkHttp3 Http Get Post Request Example

This example will show you how to use OkHttp3 to send get or post HTTP request to a web server and how to parse and display response text in an Android TextView.

1. OKHttp Characters.

1. OkHttp3 is a third-party open-source library that is contributed by the square company. It has below characters.
2. User-friendly API.
3. Support http2, sharing the same socket for all requests from a machine.
4. Built-in connection pool, support for connection reuse, and reduction of delay.
5. Supports transparent gzip compression response.
6. Avoid duplicate requests by caching.
7. Automatically retry the host’s other IP and redirect automatically when the request fails.

2. Add OkHttp3 Library In build.gradle.

1. Before you can use the OkHttp3 library, you need to add dependencies in the build.gradle file in android studio as below.
2. You can get the most recent build library from https://github.com/square/okhttp.
3. After adding the below code, you need to click the Sync Now link in the top right corner to sync the project.

2. Use OkHttp3 To Create HTTP Get Request Method Call Object.

1. The below source code snippet will use the OkHttp3 library to create an HTTP GET request.

3. Use OkHttp3 To Create HTTP Post Request Method Call Object.

1. The below source code snippet will use the OkHttp3 library to create an HTTP POST request.

4. Send Http Request Synchronously And Asynchronously.

1. You can send HTTP GET or POST requests with OkHttp3 synchronously or asynchronously.
2. When you send the request synchronously, you need to run the code in a child thread because the process may take a long time.
3. When you send the request asynchronously, the system will create a child thread and run OkHttp3 code in it automatically.

5. OkHttp Get Post Request Example.

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Android HTTP requests made easy

If you’ve ever had to make an HTTP network request in Android, you know what a pain it can be. Making Android HTTP requests usually involves writing a lot of boilerplate code. You could make things a bit easier by creating some custom classes, but it can still be tedious.

In this tutorial I will show you how to make network requests using two different methods. The first method involves creating custom classes, which will aid in code reusability. The second method involves adding a library called the Android Asynchronous Http Client by loopj. This library will greatly reduce the amount of code you will need to write.

In addition, we will be making a network request to the BitcoinAverage API which returns a JSON string. You will learn how to handle the JSON string, both with and without the use of the Android Asynchronous Http Client library.

This tutorial is for those who:

• are comfortable with the Android development environment;
• want to learn an easier way to make HTTP requests in Android.

Note: you should also be comfortable with Java and how Object-Orientation works in Java.

Adding permissions

This step is relevant to both methods. Navigate to your AndroidManifiest.xml file and add the following permission before the tag:

Method 1: Creating custom classes

The first class we will be creating is called the RequestPackage class. This class will accept three important values when making HTTP requests. First, it will receive the URL. Next, it will receive the request method (POST or GET). Last, it will receive any values that the server might need (e.g. product_id). The request package will then be sent to the HttpManager class that we will create later.

Create a class called RequestPackage and add the following code to the class:

HttpManager

Next, we will create the HttpManager class. As mentioned earlier, the HttpManager receives the RequestPackage that we created in the previous section. The HttpManager is responsible for making the actual request and receiving the response from the server.

Create a class called HttpManager and add the following code to it:

Putting it all together

Finally, we can use the code we just implemented. Here we will be putting everything together within the MainActivity. We will have to create a private class within the MainActivity and we will call it Downloader.

The Downloader class is an AsyncTask, which is required when making network requests in Android. If you try to make network requests outside an AsyncTask, your UI will freeze until it gets the HTTP response from the server.

Create an activity called MainActivity and add the following code:

And we are done. The amount of code we needed to write in order to get those three small pieces of information is a lot. It gets even worse if you want to use something like a RecyclerView. That would involve creating an adapter, which would significantly increase the amount of code we need to write.

In the next section, I will show you how to do the same thing by making use of the Android Asynchronous Http Client.

Method 2: Android Asynchronous HTTP Client

Navigate to the app/build.gradle file and enter the code below in the dependencies section:

Android Studio will ask if you would like to sync your project. You should do this and the dependencies will be downloaded.

Creating the MainActivity

Next, you will need to add the code below to the MainActivity:

Run your app and, voila, you’re done.

Conclusion

Well done! You have completed this tutorial. As you can see, the amount of code needed when working with the Android Asynchronous Http Client is far less than making HTTP requests using no library.

You now have a choice to make: do you prefer method 1 or method 2?

To find out more about the Android Asynchronous Http Client, please visit: http://loopj.com/android-async-http/

To view and/or clone a similar project to the one in this tutorial – that also uses the Android Asynchronous Http Client – please visit: https://github.com/londonappbrewery/bitcoin-ticker-android-citispy

To find out more about the BitcoinAverage API, please visit: https://bitcoinaverage.com/

Find out more about our Certified Mobile Developer Bootcamp. You will cover the following modules: Java Programming Essentials, Introduction to Mobile Development and Advanced Mobile Developer.

This article was contributed by Yusuf Isaacs.

Editor’s note: This was post was originally published November 14th, 2017 and has been updated February 18th, 2019.

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How To Send A GET Request In Android

Android Tutorials

Volley, a networking library developed by Google, enables you to send ‘GET’ requests from your Android-powered device with very few lines of code. I would recommend using Android Studio, as it can accelerate the development process by generating some of the code for you (unless you’re implementing a custom request).

While there are many ways to send GET requests using Volley, this article explains the use of the StringRequest method. If your GET request will contain JSON data, you should create a JsonObjectRequest instead. If you need to send a JSON array in your request, use a JsonArrayRequest. Bear in mind that the Volley library is built for smaller downloads (such as text).

First, you need to add the Volley library to your project using the ‘library dependency’ option. ‘Dependency’ is a widely-used term to refer to a library that apps depend on.

Next, add the necessary imports to the activity that the GET request will be sent from, as shown below.

You may now start writing your GET request!

Create a RequestQueue:

Create a StringRequest (remember to add the ‘http’ prefix) named ExampleStringRequest:

The String ‘response’ contains the server’s response. You can test it by printing response.substring(0,500) to the screen.

If you’d like to send a POST request instead, you could change the ‘.GET’ in the Request.Method.GET parameter to ‘.POST’ instead. Ensure that your back-end is configured to listen for GET requests in this case. If you’re sending a POST request, you would have to configure your back-end to receive a POST request instead, otherwise it would fail.

Be sure to add the ‘INTERNET’ permission to your AndroidManifest.xml file:

Voila! You’re done.

How To Send A JsonObjectRequest From Android (Send GET Request For JSON Data)

Another type of GET request you’re likely to need on Android is the JsonObjectRequest. A JsonObjectRequest enables you to send an HTTP request for JSON objects. The structure of a JsonObjectRequest is very similar to that of a StringRequest, which is designed for strings.

Update For 2020

If you are using a newer version of Android Studio (greater than version 4, for example), you can just add the dependency to your projects build.gradle file with one line of code, as shown below (then follow the same instructions above to import it and create the GET request).

Adding the Volley networking library as a dependency to build.gradle in Android Studio 4.01.

2 Comments

When I want to do some PUT/PATCH requests to update the info I request, how do I call the instance to trigger the PUT/PATCH request to handle such cases?

A friend of mine (Jeroen Goossens) said that you:

‘should be using callbacks to call the put/patch methods. also, beware that patch calls aren’t natively supported in the HttpUrlConnection in java. You can however call them if you override the method.’

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Android OkHttp3 Http Get Post Request Example

This example will show you how to use OkHttp3 to send get or post HTTP request to a web server and how to parse and display response text in an Android TextView.

1. OKHttp Characters.

1. OkHttp3 is a third-party open-source library that is contributed by the square company. It has below characters.
2. User-friendly API.
3. Support http2, sharing the same socket for all requests from a machine.
4. Built-in connection pool, support for connection reuse, and reduction of delay.
5. Supports transparent gzip compression response.
6. Avoid duplicate requests by caching.
7. Automatically retry the host’s other IP and redirect automatically when the request fails.

2. Add OkHttp3 Library In build.gradle.

1. Before you can use the OkHttp3 library, you need to add dependencies in the build.gradle file in android studio as below.
2. You can get the most recent build library from https://github.com/square/okhttp.
3. After adding the below code, you need to click the Sync Now link in the top right corner to sync the project.

2. Use OkHttp3 To Create HTTP Get Request Method Call Object.

1. The below source code snippet will use the OkHttp3 library to create an HTTP GET request.

3. Use OkHttp3 To Create HTTP Post Request Method Call Object.

1. The below source code snippet will use the OkHttp3 library to create an HTTP POST request.

4. Send Http Request Synchronously And Asynchronously.

1. You can send HTTP GET or POST requests with OkHttp3 synchronously or asynchronously.
2. When you send the request synchronously, you need to run the code in a child thread because the process may take a long time.
3. When you send the request asynchronously, the system will create a child thread and run OkHttp3 code in it automatically.

5. OkHttp Get Post Request Example.

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Отправляем GET запрос в Android без Apache

Когда заходит разговор о работе с HTTP под Android чаще всего сразу же вспоминают библиотеку классов от Apache. При этом незаслуженно игнорируя другой не менее эффективный способ обмена данными.

Этот способ по праву можно считать если не очевидным, то, по крайней мере, хорошо известным для тех, кто программирует на Java. Однако в среде Android разработчиков он пока почему-то не получил широкого распространения.

Речь идёт о пакете java.net, который входит в состав «обычного» Java SE, но доступен также и в Android.

Для отправки запроса потребуется всего два класса из этого пакета URL и HttpURLConnection.

Вначале создадим подключение к тому ресурсу, к которому планируется оправить запрос. Для этого создадим объект класса URL и на его основе получим объект класса HttpURLConnection.

Затем собственно отправляем сам запрос и обрабатываем результат:

В чём преимущество java.net перед Apache?

1. Это стандартный пакетJava.
   Для его использования не требуется устанавливать или подключать каких-либо сторонних библиотек. А, писать программы с его использованием можно практически «не оглядываясь» на версию Android;
2. Больше возможностей контролировать процесс обмена данными.
   В частности, можно без труда анализировать ответ сервера, что часто требуется при работе с RestAPI;
3. Более простая и компактная реализация программ для работы сHTTP.
   Для того чтобы отправить даже простой запрос в библиотеке от Apache требуется работа с тремя объектами. В java.net всё сводится, по сути, к одному HttpURLConnection. При этом без ущерба для архитектуры приложения;
4. JavaSE и, в частности,java.net превосходно документированы.
   К сожалению, этого нельзя сказать о библиотеке от Apache. Документация по ней представлена только в виде примеров, которые уже не актуальны для более новых версий.

Последнее преимущество обычно принято как-то сбрасывать со счетов. Однако про него почему-то столь же часто вспоминают, когда дело доходит до сложных или просто не тривиальных задач и все остальные способы разобраться в проблеме исчерпаны. О том насколько влияет наличие и качество документации на возможность освоения для новичков, и говорить не приходится.

Из недостатков рассматриваемого способа можно отметить только один. HttpURLConnection позволяет получить данные только в виде набора байт. Поэтому, чтобы получить ответ с сервера в виде строки требуется выполнить преобразования.

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