The SinchClient is the Sinch SDK entry point. It's used to configure the user’s and device’s capabilities, as well as to provide access to feature classes such as the CallClient, MessageClient and AudioController.

Create a SinchClient

// Instantiate a SinchClient using the SinchClientBuilder.
android.content.Context context = this.getApplicationContext();
SinchClient sinchClient = Sinch.getSinchClientBuilder().context(context)
                                                  .applicationKey("<application key>")
                                                  .applicationSecret("<application secret>")
                                                  .userId("<user id>")

Note: All listener callbacks emitted from the Sinch SDK are invoked on the same thread that the call to is made on. If the invoking thread is not the main-thread, it needs to have an associated Looper.

Specify capabilities

The SinchClient can be configured to enable or disable certain functionality. Please see the Reference for a comprehensive description of each capability.

The following example shows how to setup the client with voice calling enabled.

// Specify the client capabilities.
// or, only when the push is not desired and the application is always in foreground

Calling startListeningOnActiveConnection allows your application to receive incoming calls and messages without using push notifications.


If the application is meant to only make outgoing calls but not receive incoming calls, don’t call startListeningOnActiveConnection or setSupportManagedPush. Outgoing calls can be made after calling the start method.

Start the Sinch client

Before starting the client, add a client listener (see Reference documentation):

sinchClient.addSinchClientListener(new SinchClientListener() {

    public void onClientStarted(SinchClient client) { }

    public void onClientStopped(SinchClient client) { }

    public void onClientFailed(SinchClient client, SinchError error) { }

    public void onRegistrationCredentialsRequired(SinchClient client, ClientRegistration registrationCallback) { }

    public void onLogMessage(int level, String area, String message) { }


Terminate the Sinch client

When the app is done using the SinchClient, it should be stopped. If the client is currently listening for incoming events, it needs to stop listening as well. After terminate is called, any object retrieved directly from the client object (that is, CallClient, MessageClient, and AudioController) is considered invalid.

Terminating the client: