Build a simple Android app.......

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fun_facts);

    // Declare our view variables and assign the views rom the layout file.
    final TextView factLabel = (TextView)findViewById(R.id.factTextView);
    Button showFactButton = (Button)findViewById (R.id.showFactButton);
    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // The button was clicked so update the fact label with a new fact.
            String fact = "";
            // Randomly select a fact.
            Random randomGenerator = new Random(); // Construct a new random generator.
            int randomNumber = randomGenerator.nextInt(3);

            /* Convert the randomNumber to a random text fact
             *0 = Ants stretch when they wake up in the morning.
             *1 = Ostriches can run faster than horses.
             *2 = Olympic gold medals are actually made mostly of silver.
             */

            // if randomNumber equals 0 then
            if (randomNumber == 0) {
                // set fact equal to ant fact
                fact = "Ants stretch when they wake up in the morning.";
                }

            else if (randomNumber == 1) {
                    // set fact equal to ant fact
                    fact = "Ostriches can run faster than horses.";
                }
            else if (randomNumber == 2) {
                    // set fact equal to ant fact
                    fact = "Olympic gold medals are actually made mostly of silver.";
                }
            else {
                    fact = "Sorry, there was an error!";
                        }

            }

            // if random Number equals 1 then
            // set fact equal to Ostriches fact
            // if randomNumber equals to 2 then
            // set fact equal to olympic fact


            // Update the label with our random fact.
            factLabel.setText(fact);



   };
    showFactButton.setOnClickListener(listener);

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_fun_facts, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}