Question 127991 in Android Studio Question posted in
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Android Studio – Collections.fill ArrayList with multiple values, not the same value

I’m using Android Studio where I have an array with a size of 126, and I initially fill them with 0’s. Then I have an input with a size of 63, I want it to "replace" the first 126 values, instead of adding 63 to the 126.

For example I have an array of length 5 ( [0,0,0,0,0] ). Then I input 1,2,3 as individuals. I want it to look like [1,2,3,0,0] instead of [0,0,0,0,0,1,2,3]

example code:

ArrayList<Float> list = new ArrayList<Float>(Collections.<Float>nCopies(126, Float.valueOf(0)));

Then I add by (edited):

for (int j = 0; j < loop; j++) {
         float xx = result.multiHandLandmarks().get(i).getLandmark(j).getX();
         floaat yy = result.multiHandLandmarks().get(i).getLandmark(j).getY();
         float zz = result.multiHandLandmarks().get(i).getLandmark(j).getZ();
        list.add(xx);
        list.add(yy);
        list.add(zz);
}
Tags:

2

Answers


  1. 0

    When you use

    list.add(x.get(i))

    it will be added to the end of the array.
    use this :

    list.add(i , x.get(i))

    the first parameter is index, second is the value;

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  2. 0

    You don’t need to add, that’s the problem, you need to set.
    For example:

    for (int i = 0; i < newList.size(); i++) { //like i < 63
                        oldList.set(i, newList.get(i)); //your new value
                    }
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