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

Rishal
– Rishal

2016-07-22 17:53:14 +00:00
Commented Jul 22, 2016 at 17:53 — Rishal
– Rishal, Commented Jul 22, 2016 at 17:53

KDeogharkar · Accepted Answer · 2016-07-22 18:08:05Z

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, 2016 at 18:08

answered Jul 22, 2016 at 17:53

KDeogharkar

10.9k7 gold badges53 silver badges97 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

TikiFrance Over a year ago

I tried this code but I get errors that I cannot resolve symbols random, textview, and nextInt

KDeogharkar Over a year ago

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?

TikiFrance Over a year ago

I imported import java.util.Random;

TikiFrance Over a year ago

But I'm still confused as to where I have to import my textview variable. Thanks!

Henry Dang · Accepted Answer · 2016-07-22 17:57:17Z

0

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]

answered Jul 22, 2016 at 17:57

Henry Dang

1062 bronze badges

Collectives™ on Stack Overflow

Display Random Text From Array when Button is Pressed

2 Answers 2

4 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related