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Android Build a Simple Android App Improving Our Code Using the New Colors

I want to implement the ColorWheel without random function. Can someone help me?

I want to implement the ColorWheel without random function. Can someone help me?

2 Answers

Ezekiel dela Peña
Ezekiel dela Peña
6,231 Points

Hi! there are many ways you can do this. But here is an example. If you wanted to have a fixed color for each fact.

Here is just some idea on how it will turn out

In my code mColor[] from Color wheel and mFacts[] in FactBook is 1:1

example: if I get fact "Olympic gold medals are actually made mostly of silver." which is on index[2] of mFacts. the color I should get should be index[2] of mColor[] which is "#c25975", // mauve

Main Code:

package com.zeke.funfacts;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class FunFactsActivity extends AppCompatActivity {
    // Declare view var
    private FactBook mFactBookfact = new FactBook();
    private ColorWheel mColorWheel = new ColorWheel();
    private TextView mFactTxtView;
    private Button mShowFactBtn;
    private RelativeLayout mRelativeLayout;

    protected void onCreate(Bundle savedInstanceState) {

        // Assign views from the layout file to the corresponding variable
        mFactTxtView = (TextView) findViewById(R.id.factTextView);
        mShowFactBtn = (Button) findViewById(R.id.showFactButton);
        mRelativeLayout = (RelativeLayout) findViewById(R.id.relativeLayout);

        mShowFactBtn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
               //randomNum gets the random number used 
                int randomNum = mFactBookfact.returnRandomNum();
                String fact = mFactBookfact.getFact(randomNum);
                int color = mColorWheel.getColor(randomNum);


                // Update the screen with a random fact


package com.zeke.funfacts;

import java.util.Random;

public class FactBook {

    private String[] mFacts = {
            "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." };

    public String getFact(int randomNum) {
        // Randomly select a fact
        String fact = mFacts[randomNum];

        return fact;

//this function returns randomNum use to get the fact
    public int returnRandomNum() {
        return  new Random().nextInt(mFacts.length);

Color Wheel:

package com.zeke.funfacts;

import android.graphics.Color;

import java.util.Random;

public class ColorWheel {

    private String[] mColor = {
            "#39add1", // light blue
            "#3079ab", // dark blue
            "#c25975", // mauve
            "#e15258", // red
            "#f9845b", // orange
            "#838cc7", // lavender
            "#7d669e", // purple
            "#53bbb4", // aqua
            "#51b46d", // green
            "#e0ab18", // mustard
           /* commenting this
            "#637a91", // dark gray
            "#f092b0", // pink
            "#b7c0c7"  // light gray

    public int getColor(int randomNum) {
        // Randomly select a color
        String color = mColor[randomNum];
        int colorAsInt = Color.parseColor(color);

        return colorAsInt;

Thank you very much, for your response.