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Start your free trialEleni Minadaki
3,687 Pointssomething goes wrong with the loop...
Hi treehousers! i am creating an app based in Build a simple android app,"fun facts." The problem i have is that is my FactBook.java class is not change insequence (from 1 to 2 to 3 etc...).The only different thing i have make from the lessons is that i have add 31 text, because i try to make something like diary of the month. i put my code below so you can understand better,just instead of my 31 texts i put 5 ".....". i hope someone to know about this! Thanks!
public class FactBook {
public String [] mFacts = {
"1)........",
"2)........",
"3)........",
"4)........",
"5)........",
};
public String getFact(){
String fact = "";
Random randomGenerator = new Random();
int randomNumber = randomGenerator.nextInt(mFacts.length);
fact = mFacts[randomNumber];
return fact;
}
}
'
2 Answers
Jeremiah Montano
7,221 PointsThe reason your code isn't running in sequence is because you are still calling a random number to be generated and used to pull a fact. If you want the facts to go in order from 1 - 31 or whatever, you would need to use a for loop and store the number of the fact somewhere in your program in another variable.
janbaran
3,681 PointsSo you want to get your facts in ascending order? E.g.
- first call of getFact should return "1)........"
- 2nd call => "2)........" -3rd call => "3)........" -... and the 6th call should start from the beginning?
If so, there is no need for random numbers and you should implement your specific logic probably this way:
- decide where the first call should start
- create a holder var for the next getFact call, so it will know where to continue
- update this var in the getFact
Eleni Minadaki
3,687 PointsHello janbaran, thanks a lot for your anwer!
Eleni Minadaki
3,687 PointsEleni Minadaki
3,687 PointsHello Jeremiah, thanks a lot for your reply. This you tell me seems the solution, just because i am new in android and in java,i follow step by step the lessons and its little confused for me what should i delete and what should i write and where. But i know to make the for,so i 'll try and could i make an other question to you if i need later?
Eleni Minadaki
3,687 PointsEleni Minadaki
3,687 PointsHello again Jeremiah, your suggestion to make a for loop help me a lot But as i expect i stuck because something i have to delete or to add in my main or in another class and i don't know what. If you can again to help me i appreciate! 1) The problem i have know is that when the app runs the colors change with the random But the text didn't, 2) i delete the random from the factBookClass and create a for. 3)Below i will write my code for i) my main with the name ThoughtOfTheDayActivity.java ii)the FactBook.java and iii)ColorWheel.java (the only problem in colorwheel is that the color in the end " int colorAsInt = Color.parseColor(color);" is red but i don't have a warning why) as i told you the previous time i have write 31 articles for each day,something like a diary But instead of 31 i will write 5)......; for don't be more tedious. Thanks a lot for any help you could give me.
FACTBOOK.JAVA public class FactBook { public static void main(String [] args){ String[] mFacts; mFacts = new String[5]; mFacts[0]...; mFacts[1]...; mFacts[2]...; mFacts[3]...; mFacts[4]...;
int i; for(i=0; i<mFacts.length; i++) { System.out.println(mFacts[i]);
THOUGHTOFTHEDAYACTIVITY.JAVA
import android.app.Activity; import android.graphics.Color; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView; import android.widget.Toast;
import java.util.Random;
public class ThoughtOfTheDayActivity extends Activity {
}
COLORWHEEL.JAVA
import android.graphics.Color;
import java.util.Random;
/**
Created by Eleni on 30/4/2015. */ public class ColorWheel {
public String [] mColors = {
};
public int getColor(){ String color = ""; Random randomGenerator = new Random(); int randomNumber = randomGenerator.nextInt(mColors.length);
}
}