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(Android™) Send and Receive WebSocket FrameDemonstrates how to send a websocket text frame to a websocket echo server. This example uses Chilkat's websocket test echo server at ws://websockets.chilkat.io/wsChilkatEcho.ashx
Note: The websockets.chilkat.io server imposes the following limitations:
// 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 websockets.chilkat.io // IMPORTANT: websockets.chilkat.io accepts frames of up to 16K in size and echoes them back. // IMPORTANT: The websockets.chilkat.io server imposes the following limitations: // ---------- Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages. boolean success = rest.Connect("websockets.chilkat.io",80,false,false); ws.UseConnection(rest); ws.AddClientHeaders(); String responseBodyIgnored = rest.fullRequestNoBody("GET","/wsChilkatEcho.ashx"); success = ws.ValidateServerHandshake(); if (success != true) { Log.i(TAG, ws.lastErrorText()); return; } // This example demonstrates sending a frame and receiving a text frame. // Send a frame containing the string "Hello World!" // This will be the first and final frame, and therefore this constitutes the entire message. boolean finalFrame = true; success = ws.SendFrame("Hello World!",finalFrame); if (success != true) { Log.i(TAG, ws.lastErrorText()); return; } // Read an incoming frame. 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; } // Show the string that was received. String receivedStr = ws.getFrameData(); Log.i(TAG, "Received: " + receivedStr); // 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; } // Should receive the "Close" opcode. Log.i(TAG, "Received opcode: " + ws.frameOpcode()); // Should be the same status code we sent (1000) Log.i(TAG, "Received close status code: " + String.valueOf(ws.get_CloseStatusCode())); // The server may echo the close reason. If not, this will be empty. Log.i(TAG, "Echoed close reason: " + ws.closeReason()); 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." } } |
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