// onClick
if(answer1.getText() == mAnswer) {
                    mScore++;
                    score.setText("Punkte: " + mScore);
                    answer1.setBackgroundResource(R.color.colorCorrect);
                    doDelay();
                    fragezaehler.setText(mQuestionNumber + "/" + mQuestionLength);
                    updateQuestion(mQuestionNumber++);

// Delay
private void doDelay() {
        SystemClock.sleep(3000);
    }