Simple array example mini-app

Let's make a simple working array example. You can get the completed code for this example in the downloadable code bundle. It can be found in the Chapter 15/Simple Array Example/MainActivity.java folder.

Create a project with an Empty Activity and call it Simple Array Example.

First we declare our array, allocate five spaces, and initialize values to each of the elements. Then we output each of the values to the logcat console. Add the following code to the onCreate method just after the call to setContentView:

// Declaring an array
int[] ourArray;

// Allocate memory for a maximum size of 5 elements
ourArray = new int[5];

// Initialize ourArray with values
// The values are arbitrary, but they must be int
// The indexes are not arbitrary. 0 through 4 or crash!

ourArray[0] = 25;
ourArray[1] = 50;
ourArray[2] = 125;
ourArray[3] = 68;
ourArray[4] = 47;

//Output all the stored values
Log.i("info", "Here is ourArray:");
Log.i("info...