@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        bindView();

        messageTextView.setTypeface(Typeface.DEFAULT_BOLD);
        messageField.setSelection(messageField.length());
        messageField.requestFocus();
        iconImageView.setImageResource(R.drawable.redicon);
        fieldEnum = FieldEnum.message;

        startButton.setOnClickListener(new startButtonListener());
        clearButton.setOnClickListener(new clearButtonListener());

        exitButton.setOnClickListener(new exitButtonListener());
    }

    class startButtonListener implements View.OnClickListener {
        @Override
        public void onClick (View v){
            if (mSpeechRecognizer == null) {
                if (isConnected()) {
                    startVoiceRead();
                    displayToast(Constants.Message.START);
                } else {
                    displayToast(Constants.Message.ERROR_NETWORK);
                }
            } else {
                stopVoiceRead();
                readyMessageText += changedReceivedMessage;
                displayToast(Constants.Message.STOP);
            }
        }
    }

    class clearButtonListener implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            contactText = "";
            readyMessageText = "";
            messageField.setText(readyMessageText);
            contactField.setText(contactText);
            stopVoiceRead();
        }
    }

    class exitButtonListener implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            stopVoiceRead();
            System.exit(0);
        }
    }

    private void displayToast(String message) {
        Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
    }