Primus Android Library

This is a very simple Primus client for Android. I've only tested with Primus setup using the SockJS transformer.

Installation

Add the following to your build.gradle.

dependencies {
  compile 'io.cine:primus:0.0.4'
}

Ensure Maven central is included in your build.gradle. This should happen by default when building a project with Google's recommended Android IDE, Android Studio.

apply plugin: 'android'
buildscript {
  repositories {
    mavenCentral()
  }
}
repositories {
  mavenCentral()
}

Download primus-android to your application with ./gradlew build.

Usage

AndroidManifest.xml

Primus uses the internet. We need permission for that.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.example.yourpackage">
  <!-- Make sure to include the internet permission -->
  <uses-permission android:name="android.permission.INTERNET" />
</manifest>

Initialization

import io.cine.primus.Primus;

public class MainActivity extends Activity {
  private Primus primus;
  private final String PRIMUS_URL = "http://example.com/primus";
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    primus = Primus.connect(this, PRIMUS_URL);
    Primus.PrimusOpenCallback openCallback = new Primus.PrimusOpenCallback() {
      @Override
      public void onOpen() {
        // Websocket open
      }
    };
    Primus.PrimusDataCallback dataCallback = new Primus.PrimusDataCallback() {
      @Override
      public void onData(JSONObject data) {
        //got data
      }
    });
    primus.setOpenCallback(openCallback);
    primus.setDataCallback(dataCallback);
  }
}

Sending data

try {
  JSONObject j = new JSONObject();
  j.put("some", "data");
  primus.send(j);
} catch (JSONException e) {
  e.printStackTrace();
}

Ending

  primus.end();

Features

1. Auto reconnecting using exponential backoff

• heartbeat
• converting messages to a JSONObject
• waiting until connection is ready to send messages