This is my fourth tutorial for how to build a ListView based Android app. In last tutorial, I have shown an example about how to build ListView with text, image, and button. In this tutorial, I will demonstrate how to play sound with Android Mediaplayer. In my example code, I will set an event listener on the button which is put in ListView. When users click on the button, I will play the local mp3 file basing on which ListView button is clicked. After we finish, you will be able to build a Android music player which has a playlist. When users click play button in the playlist, you can play the corresponding mp3 file.
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New Update Version 1.6:

• Add cropping function
• Scale bitmap data before setting as wallpaper

To create an Android wallpaper app, the cropping picture function is quite necessary. To support multiple Android screens, I have to make sure to assign the right size pictures to Android wallpaper. In my solution, I will prepare a set of high resolution pictures to fit the majority Android screen size. When users choose one picture, I will let them to trim the pictures in a specific aspect ratio to perfectly fit the screen size. For example, I will prepare the big image in 1600×1000. When users want to set wallpaper on their 480×800 Android phone, I will provide a cropping tool which can only trims the image in 3:5 aspect ratio. Now, let me show you how I add this cropping feature in my Android Wallpaper app.
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In my android app “Memo English Fruit Master”, I create a customized ListView. In each ListView item, I put a button inside so when user clicks on the button, the app will play a voice over according to the text in that ListView item. The problem is here, how do I know which voice over the app should play. Hence, I need to know the position of the item in ListView. Here are several ways to get listview item position on click.
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In my last tutorial, I have shown you how to load the built-in JSON data file to initialize the app. I am building a new data array from JSON file and apply the data array to ListView. For each item in the Android ListView, I will customize the item layout by adding one imageView, two textField and one button.

In Android, ListView is composed of several item views. Each item view is a normal Android View. Therefore, the concept for customizing Android ListView item is quite simple. In this tutorial, I will show you how to define a customized ListView item.
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