The error is, that it is showing a red line in Collections.addAll(in,n).
How do I solve this?
ArrayList<Integer> in = new ArrayList<>(); //declared array in integer type
int[] n = getResources().getIntArray(R.array.number12);
Collections.addAll(in,n); //this is not working showing error,it is not accepting
integers.xml
<resources>
<integer-array name="number12">
<item>735895698</item>`
<item>814895046</item>``
</integer-array>
</resources>
This doesn't work, because an int[]-array is not an Integer[]-array, which Collections.addAll() expectes.
here are two ways to create a list from an array. This uses a for-each loop which iterates over the array and then adds every int in the array to the list:
int[] n = getResources().getIntArray(R.array.number12);
List<Integer> list = new ArrayList<>(n.length);
for(int i : n){
list.add(i);
}
The other way, is to use the in Java8 introduced Arrays.stream():
int[] n = getResources().getIntArray(R.array.number12);
List<Integer> list = Arrays.stream(n)
.boxed()
.collect(Collectors.toList());
And if you explicitly want to get an ArrayList you can use the following:
int[] n = getResources().getIntArray(R.array.number12);
List<Integer> list = Arrays.stream(n)
.boxed()
.collect(Collectors.toCollection(ArrayList::new));
Integer not an array of intQuick fix:
ArrayList<Integer> in= new ArrayList<>();//declared array in integer type
Integer[] n=getResources().getIntArray(R.array.number12);
Collections.addAll(in,n);//this is not working showing error,it is not
As explained here, the type needs to be the same.
The Collection expects an array of Integer, not an array of int
in.addAll(Arrays.stream(n).boxed().collect(Collectors.toList()));