Arrays

// Arrays are used to store data in a structured fashion.
// It's basically a list of items, any kind of items organized in a manner,
// such that each item or element within it can be accessed by using a number.

// The number is known as the index of the element and
// it's simply a counter of the elements that starts at zero.
// And is incremented by one for each additional element in the array.

//The items in the array can be any kind of data type or object.
// Our app will use an array of string objects because each fact will be
// stored as text in a string.

public class FunFactsActivity extends Activity {
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fun_facts);

        final TextView factLabel = (TextView) findViewById(R.id.factTextView);
        Button showFactButton = (Button) findViewById(R.id.showFactButton);
        View.OnClickListener listenerName = new View.onClickListener(){

                @Override
                public void onClick(View view) {

                String[] facts = {
                        "Ants stretch when they wake up in the morning.",
                        "Ostriches can run faster than horses.",
                        "Olympic gold medals are actually made mostly of silver.",
                        "You are born with 300 bones; by the time you are an adult you will have 206.",
                        "It takes about 8 minutes for light from the Sun to reach Earth.",
                        "Some bamboo plants can grow almost a meter in just one day.",
                        "The state of Florida is bigger than England.",
                        "Some penguins can leap 2-3 meters out of the water.",
                        "On average, it takes 66 days to form a new habit.",
                        "Mammoths still walked the earth when the Great Pyramid was being built." };

                String fact = "";

                Random randomGenerator = new Random ();
                int randomNumber = randomGenerator.nextInt(facts.length);

                fact = facts[randomNumber];

                factLabel.setText(fact);
                               }
        };

        showFactButton.setOnClickListener(listenerName);
    }
}
//-----------------------------------------------------------------------------------------------------------------------------------------

public class FunFactsActivity extends Activity {
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fun_facts);

    final TextView factLabel = (TextView) findViewById(R.id.factTextView);
    Button showFactButton = (Button) findViewById(R.id.showFactButton);
    View.OnClickListener listenerName = new View.onClickListener(){

        @Override
        public void onClick(View view) {

        String[] facts = {                                  // Datatype[] nameOfArray
                "Ants stretch when they wake up in the morning.",                                //index 0
                "Ostriches can run faster than horses.",                                         //index 1
                "Olympic gold medals are actually made mostly of silver.",                       //index 2
                "You are born with 300 bones; by the time you are an adult you will have 206.",  //index 3
            "It takes about 8 minutes for light from the Sun to reach Earth.",               //index 4
                "Some bamboo plants can grow almost a meter in just one day.",                   //index 5
                "The state of Florida is bigger than England.",                                  //index 6
            "Some penguins can leap 2-3 meters out of the water.",                           //index 7
                "On average, it takes 66 days to form a new habit.",                             //index 8
                "Mammoths still walked the earth when the Great Pyramid was being built." };     //index 9

        String fact = "";
                Random randomGenerator = new Random ();
        int randomNumber = randomGenerator.nextInt(facts.length);  // "nameOfArray.length" uses the # of elements in the array instead of the hardcoded element like "10"

        fact = facts[randomNumber];      // this syntax is saying hey, facts array, give me the element at the index a random number.
// Duh:
// Now, we could have plugged in a number here instead of the random number variable
// like zero would give us the first number in the array.  //fact = facts[0]
// But that would always give us the same element.

        factLabel.setText(fact);
                       }
        };

        showFactButton.setOnClickListener(listenerName);
    }
}




//https://teamtreehouse.com/library/build-an-android-app/coding-the-fun-facts/introduction-to-arrays