Randomly Assign Array Elements?

ramgraph1 · by **ramgraph1** » Sun Feb 03, 2008 11:49 pm

Is there an easy way to randomly assign array elements to objects so that each object in a series has a different element? So instead of the code below, object1 would randomly be assigned one of the elements, object2 a different element and so on until each of the five objects and five array elements are all randomly paired?

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object1 = (objectcount[0]);
 
object2 = (objectcount[1]);
 
object3 = (objectcount[2]);
 
object4 = (objectcount[3]);
 
object5 = (objectcount[4]);
Parsed in 0.029 seconds,  using GeSHi 1.0.8.4

plusminus · by **plusminus** » Mon Feb 04, 2008 1:31 am

Hello ramgraph,

Looks like you have an Array of Objects before :?:

so you could shuffle it before assigning its elements to the objects. Done like this:

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                String[] objArr = {"A","B","C","D"};
                ArrayList<String> objList = Lists.newArrayList(objArr);
                Collections.shuffle(objList );
                
                objList.toArray(objArr);
                // objArr is now shuffled
Parsed in 0.031 seconds,  using GeSHi 1.0.8.4

Regards,
plusminus

ramgraph1 · by **ramgraph1** » Mon Feb 04, 2008 9:22 am

Wow. That's perfect! So simple and yet so beyond what I knew...
Thanks once more!

plusminus · by **plusminus** » Mon Feb 04, 2008 10:00 am

Hello ramgraph,

the java.util.Collections-Classcontaisn some useful static methods for List/Collections-Stuff.
Like: shuffle, reverse, swap, min, max, frequency and of course sort...

I love that Android function: "Lists.newArrayList(anyArray);"

Regards,
plusminus

ramgraph1 · by **ramgraph1** » Mon Feb 04, 2008 10:41 pm

Shuffle is working great. But there is something that I was hoping to do with it that didn't work the way I thought it might. With one of the arrays that I am shuffling, I wanted to assign the array's elements to some objects' images. I defined a string array:

Code: Select all: String [] objects = {"red","blue","green","yellow","purple"};

and I tried this:

Code: Select all: door1.setImageResource(R.drawable.(objects[0]));

I have pngs with the names of the elements of the string array and this code works fine:

Code: Select all: door1.setImageResource(R.drawable.red);

Is there a way to get these array elements into the drawable reference so that I can have them randomly assigned?

plusminus · by **plusminus** » Mon Feb 04, 2008 11:21 pm

Hello ramgraph,

wohoo this is really weird if you think about it for one moment :!:

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door1.setImageResource(R.drawable.(objects[0]));
Parsed in 0.034 seconds,  using GeSHi 1.0.8.4

If we had a very very very very very very... intelligent programming language it would probably understand what you want to do (your thought is basically right, but 100% impossible the way you tried :!:

).

There is an Android built in function, called getIdentifier, which transforms the name of a resource to the ID it got assigned.
:idea:

Sample call:

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int resID = getResources().getIdentifier("myImage", "drawable", "org.anddev.android.testproject");
Parsed in 0.035 seconds,  using GeSHi 1.0.8.4

For you it would be something like:

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door1.setImageResource(getResources().getIdentifier(objects[0], "drawable", "your.package.structure"));
Parsed in 0.035 seconds,  using GeSHi 1.0.8.4

Let us know if it helped you.

Regards,
plusminus

ramgraph1 · by **ramgraph1** » Tue Feb 05, 2008 12:22 am

That worked perfectly and helps out a lot. Thanks.

Randomly Assign Array Elements?

Randomly Assign Array Elements?

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