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How to add prev,next buttons to achieve the ergodic analysis, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

1) modify strings.xml to add two buttons

Next one

Prev_button

1The Pacific Ocean is larger than the Atlantic Ocean

2The Suez Canal connects the Red Sea and the Indian Ocean

3the source of the nile River is in Egypt

4the amazon river is the longest river in the USA

5Lake Baikal is the world\'s oldest and deepest freshwater lake

2) modify activity_main.xml and lay out two buttons

3) modify MainActivity.java

Private Button mNextButton

Private TextView mQuestionTextView

Private Button mPrevButton

Private Question [] mQuestionsBank=new Question [] {

New Question (R.string.scientific oceans.true)

New Question (R.string.creative mideast.false)

New Question (R.string.Fracula false)

New Question (R.string.diagnostic americas.true)

New Question (R.string.originalasiatrue)

}

Private int mCurrentIndex=0

Private void updateQuestion () {

Int question= mQuestionsBank [mCurrentIndex] .getTextResId ()

MQuestionTextView.setText (question)

}

4) modify onCreate method

MNextButton = (Button) findViewById (R.id.next_button)

MNextButton.setOnClickListener (new View.OnClickListener () {

@ Override

Public void onClick (View view) {

MCurrentIndex= (mCurrentIndex+1)% mQuestionsBank.length

UpdateQuestion ()

}

});

MPrevButton= (Button) findViewById (R.id.prev_button)

MPrevButton.setOnClickListener (new View.OnClickListener () {

@ Override

Public void onClick (View view) {

MCurrentIndex-=1

If (mCurrentIndex==-1) {

MCurrentIndex=mQuestionsBank.length-1

}

UpdateQuestion ()

}

});

The effect is as shown in the picture

After reading the above, do you know how to add prev,next buttons to implement the traversal analysis of the problem? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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