Slide 11.1: Android server connection

Android Server Connection

There are a couple of ways to allow Android to connect to the servers. Two of the classes for the connections are given as follows:

URLConnection, which represents a communications link between the application and a URL, and

HttpClient, which is an interface for an HTTP client and was deprecated in Android 5.1 and is removed from the Android SDK in Android 6.0. In order to use it, edit the dependencies in build.gradle to the following:

Gradle Scripts: build.gradle (Module: app)

dependencies {
  compile fileTree(include: ['*.jar'], dir: 'libs')
  compile 'com.android.support:appcompat-v7:23.0.1'
  compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
    ...
}

This app is revised from the Android - PHP/MySQL Tutorial, which retrieves the user’s role from the MySQL database on the server according to the entered username and password.

The three figures on the right show the screenshots of this application, which calls a JDBC program using either one of the two methods: GET and POST.

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