Android™

WebSocket Binance Trade Stream (subscribe and receive updates)

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Subscribe to a binance trade stream and receive updates. Android™

// 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);

    boolean success = false;

    // 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 wss://stream.binance.com:9443
    success = rest.Connect("stream.binance.com",9443,true,false);
    if (success == false) {
        Log.i(TAG, rest.lastErrorText());
        return;
        }

    success = ws.UseConnection(rest);
    if (success == false) {
        Log.i(TAG, ws.lastErrorText());
        return;
        }

    ws.AddClientHeaders();

    //  Raw streams are accessed at /ws/<streamName>
    String responseBody = rest.fullRequestNoBody("GET","/ws/btcusdt");
    if (rest.get_LastMethodSuccess() == false) {
        Log.i(TAG, rest.lastErrorText());
        return;
        }

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

    Log.i(TAG, responseBody);
    Log.i(TAG, rest.responseHeader());

    // POST JSON to subscribe to a stream

    // {
    // "method": "SUBSCRIBE",
    // "params":
    // [
    // "btcusdt@aggTrade",
    // "btcusdt@depth"
    // ],
    // "id": 1
    // }

    CkJsonObject json = new CkJsonObject();
    json.UpdateString("method","SUBSCRIBE");
    json.UpdateString("params[0]","btcusdt@aggTrade");
    json.UpdateString("params[1]","btcusdt@depth");
    json.UpdateInt("id",1);

    // Send a full message in a single frame
    boolean finalFrame = true;
    success = ws.SendFrame(json.emit(),finalFrame);
    if (success != true) {
        Log.i(TAG, ws.lastErrorText());
        return;
        }

    CkJsonObject jsonTradeData = new CkJsonObject();
    jsonTradeData.put_EmitCompact(false);

    // Begin reading the trade stream response.
    // We'll just read the 1st 10 updates and then exit..
    boolean receivedFinalFrame = false;
    int numTradesReceived = 0;
    while (numTradesReceived < 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 receivedJson = ws.getFrameData();

            jsonTradeData.Load(receivedJson);
            Log.i(TAG, jsonTradeData.emit());

            numTradesReceived = numTradesReceived + 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.");

    // The output of the above code is shown here:

  }

  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."
  }
}