I learnt many new concepts through this app and so I have divided it into 2 parts. In the 1st part of the app I got to know :-
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How to navigate between different activities of an app through Explicit Intent
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How to store data in a list and when to use Array and ArrayList
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What is RECYCLER VIEW and how is it used using ListView and ArrayAdapter
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Defining my own CustomArrayAdapter and implementing it
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How to include audio files in my app
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How to play audio files using MediaPlayer class and when to release resources held by its objects
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About AUDIO FOCUS and its methods which plays a vital role in any app
Download the pre-release version of the app APK to have a glimpse of it!!
In the 2nd part of the app, I learnt about :-
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How users can navigate between different acticities of an app using ViewPager and FragmentPagerAdapter
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How to have Ripple Effect for buttons
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Methods of FragmentPagerAdapter and also creatd my own CustomPagerAdapter
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Adding TabLayout to ViewPager so that clicking on tabs changes the ontent of ViewPager or swiping the activity changes the text of the respective tab
Download the final version of the app APK to have a run at it :)