(Android™) Read Bitfinex WebSocket Ticker Channel

Subscribes to the public Bitfinex websocket ticker channel and receives ticker updates.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkWebSocket ws = new CkWebSocket();

    //  For brevity, this example does not check for errors when etablishing the WebSocket connection.
    //  See Establish WebSocket Connection for more complete sample code for making the connection.

    CkRest rest = new CkRest();

    //  Connect to api.bitfinex.com
    boolean success = rest.Connect("api.bitfinex.com",443,true,false);
    ws.UseConnection(rest);
    ws.AddClientHeaders();

    String responseBody = rest.fullRequestNoBody("GET","/ws");
    success = ws.ValidateServerHandshake();
    if (success != true) {
        Log.i(TAG, ws.lastErrorText());
        Log.i(TAG, responseBody);
        Log.i(TAG, rest.responseHeader());
        return;
        }

    //  After connecting, the bitfinex websocket server will send
    //  an info message that contains the actual version of the websocket stream.
    //  Receive that message..
    success = ws.ReadFrame();
    if (success != true) {
        Log.i(TAG, "Failed to receive a frame");
        Log.i(TAG, "ReadFrame fail reason = " + String.valueOf(ws.get_ReadFrameFailReason()));
        Log.i(TAG, ws.lastErrorText());
        return;
        }

    //  We should get this:
    //  {"event":"info","version":1.1,"platform":{"status":1}}
    Log.i(TAG, ws.getFrameData());

    //  Subscribe to the public ticker feed.
    //  See https://docs.bitfinex.com/docs for more information.
    CkJsonObject json = new CkJsonObject();
    json.AppendString("event","subscribe");
    json.AppendString("channel","ticker");
    json.AppendString("pair","BTCUSD");

    boolean finalFrame = true;
    success = ws.SendFrame(json.emit(),finalFrame);

    //  Read the response.
    success = ws.ReadFrame();
    if (success != true) {
        Log.i(TAG, "Failed to receive a frame");
        Log.i(TAG, "ReadFrame fail reason = " + String.valueOf(ws.get_ReadFrameFailReason()));
        Log.i(TAG, ws.lastErrorText());
        return;
        }

    //  Examine the response
    //  We should get this:
    //  {"event":"subscribed","channel":"ticker","chanId":2751,"pair":"BTCUSD"}
    Log.i(TAG, ws.getFrameData());

    //  Begin reading the ticker feed.
    //  We'll just read the 1st 5 updates and then exit..
    boolean receivedFinalFrame = false;
    int numUpdatesReceived = 0;
    while (numUpdatesReceived < 5) {

        success = ws.ReadFrame();
        if (success != true) {
            Log.i(TAG, "Failed to receive a frame");
            Log.i(TAG, "ReadFrame fail reason = " + String.valueOf(ws.get_ReadFrameFailReason()));
            Log.i(TAG, ws.lastErrorText());
            return;
            }

        //  The responses we desire are in Text frames, where the opcode = 1.
        if (ws.get_FrameOpcodeInt() == 1) {
            String receivedText = ws.getFrameData();
            Log.i(TAG, receivedText);
            //  Should receive a line of text such as this:
            //  [2751,7349,36.34269559,7349.1,41.01777063,-116.2,-0.0156,7349.1,22188.26055319,7560,7270.5]
            numUpdatesReceived = numUpdatesReceived + 1;
            }

        }

    //  Close the websocket connection.
    success = ws.SendClose(true,1000,"Closing this websocket.");
    if (success != true) {
        Log.i(TAG, ws.lastErrorText());
        return;
        }

    //  Read the Close response.
    success = ws.ReadFrame();
    if (success != true) {
        Log.i(TAG, "ReadFrame fail reason = " + String.valueOf(ws.get_ReadFrameFailReason()));
        Log.i(TAG, ws.lastErrorText());
        return;
        }

    Log.i(TAG, "Success.");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}