Display Random Text From Array when Button is Pressed

Question

From a string array (code below), I want to randomly display one of the strings in a TextView (code below), when a button is pressed (code below). Do I have to use an onClick"sendMessage" and then a random string generator? How would I do this in Java? Many thanks!

<resources>
    <string-array name="colorArray">
        <item>Green</item>
        <item>Red</item>
        <item>Purple</item>
        <item>Blue</item>
        <item>Orange</item>
        <item>Brown</item>
        <item>Yellow</item>
        <item>White</item>
        <item>Pink</item>
</resources>

<TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="NOT SURE WHAT TO PUT HERE"
        android:textSize="76sp"
        android:gravity="center"
        android:textAllCaps="true"/>

<Button
        android:id="@+id/green_button"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="@drawable/green_button"/>

check this link [Get random value from array](http://stackoverflow.com/questions/11600001/how-to-get-a-random-value-from-a-string-array-in-android) — Rishal, Jul 22 '16 at 17:53

KDeogharkar · Accepted Answer · 2016-07-22T18:08:05.133

2

Generate random number using function Random whose value should not be exceed (array length - 1) using that value get value from string array and display it in your textview.

String[] colors = getResources().getStringArray(R.array.colorArray);

Random random = new Random();

textView.setText(colors[random.nextInt(colors.length()-1)]);

hope this will help.

Note : This snippet is just an example .pass your variables in it.

edited Jul 22 '16 at 18:08

answered Jul 22 '16 at 17:53

KDeogharkar

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I tried this code but I get errors that I cannot resolve symbols `random`, `textview`, and `nextInt` – TikiFrance Jul 22 '16 at 18:03
this is just snippet example now you have to pass your textview variable to it. and random and nextint should work why it is giving you cannot resolve error? – KDeogharkar Jul 22 '16 at 18:05
I imported import java.util.Random; – TikiFrance Jul 22 '16 at 18:19
But I'm still confused as to where I have to import my textview variable. Thanks! – TikiFrance Jul 22 '16 at 18:22

score 0 · Answer 2 · answered Jul 22 '16 at 17:57

You need a random number generator for the array indexes (see https://docs.oracle.com/javase/8/docs/api/java/util/Random.html)

Put an onClickListener on your Button. Then, using Random, generate a random int, which we will call randomNumber.

From there, the process is easy.

Check if user has clicked the button via an onClickListener
If the button is clicked, generate a random number, randomNumber, via the Random class.
Display your random String by setting your EditText's text to colorArray[randomNumber]

Display Random Text From Array when Button is Pressed

2 Answers2