final Client mKinveyClient = new Client.Builder(this.getApplicationContext()).build();

mKinveyClient.ping(new KinveyPingCallback() {
    public void onFailure(Throwable t) {
        Log.e("TAG", "Kinvey Ping Failed", t);
    }

    public void onSuccess(Boolean b) {
        Log.d("TAG", "Kinvey Ping Success");
    }
});

this code runs android 4.2.2 and 4.1.0 but exists error for android 6.0;
Kinvey Ping Failed

                                                                    com.kinvey.java.KinveyException: 

                                                                    REASON: The request failed.

                                                                    FIX: 

                                                                    EXPLANATION: com.kinvey.java.core.KinveyJsonResponseException: unknown