Ergodic Analysis of how to add prev,next Button to implement
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!
