Android Click to Call

Example of Click to Call application for Android

This example allows to place outgoing audio call with one button click using account specified in server config file

/usr/local/FlashphonerWebCallServer/conf/apps/click-to-call/accounts.xml

On the screenshot below the example is displayed after terminating a call and closing connection to server.

Input fields required for connecting to WCS server and placing a call

• WCS URL, where 192.168.2.104 is the address of the WCS server
• Callee, where 001 is the SIP username of the callee

Analyzing the example code

To analyze the code, let's take class ClickToCallActivity.java of the click-to-call example, which can be downloaded with corresponding build 1.0.1.38.

1. Initialization of the API

Flashphoner.init() code

For initialization, Сontext object is passed to the init() method.

Flashphoner.init(this);

2. Session creation

Flashphoner.createSession() code

SessionOptions object with URL of WCS server is passed to createSession method

SessionOptions sessionOptions = new SessionOptions(mWcsUrlView.getText().toString());
session = Flashphoner.createSession(sessionOptions);

3. Connection to the server

Session.connect() code

Connection object with appKey of internal server-side REST hook application clickToCallApp is passed to the method

Connection connection = new Connection();
connection.setAppKey("clickToCallApp");
/**
  * Connect to WCS server
  */
session.connect(connection);

4. Receiving the event confirming successful connection

Session.onConnected(), Session.createCall() code

On this event, outgoung call is created with Session.createCall() method. CallOptions object with callee SIP username is passed to the method.

@Override
public void onConnected(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mCallButton.setText(R.string.action_hangup);
            mCallButton.setTag(R.string.action_hangup);
            mCallButton.setEnabled(true);
            mCallStatus.setText("Connection: " + connection.getStatus());

            /**
              * Pass 'callee' to the callOptions and create a new call object
              */
            CallOptions callOptions = new CallOptions(mCalleeView.getText().toString());
            call = session.createCall(callOptions);
            call.on(new CallStatusEvent() {
                ...
            });

            ActivityCompat.requestPermissions(ClickToCallActivity.this,
                  new String[]{Manifest.permission.RECORD_AUDIO},
                  CALL_REQUEST_CODE);
            ...
        }
    });
}

5. Making outgoing call when permissions are granted

Call.call() code

case CALL_REQUEST_CODE: {
    if (grantResults.length == 0 ||
          grantResults[0] != PackageManager.PERMISSION_GRANTED) {
        mCallButton.setEnabled(false);
        session.disconnect();
        Log.i(TAG, "Permission has been denied by user");
    } else {
        /**
          * Make the outgoing call
          */
        call.call();
        Log.i(TAG, "Permission has been granted by user");
    }
}

6. Disconnection

Session.disconnect() code

mCallButton.setEnabled(false);
session.disconnect();

7. Receiving the event confirming successful disconnection

Session.onDisconnection() code

@Override
public void onDisconnection(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mCallButton.setText(R.string.action_call);
            mCallButton.setTag(R.string.action_call);
            mCallButton.setEnabled(true);
            mCallStatus.setText("Connection: " + connection.getStatus());
        }
    });
}