Hi,
mPreviousButton = (Button) findViewById(R.id.previous_button);
mPreviousButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
if (mCurrentIndex == 0) {
updateQuestion();
}else {
mCurrentIndex = (mCurrentIndex -1 ) % mQuestionsBank.length;
updateQuestion();
}
}
});