I notice in the source code they are not used in critical loops, e.g.
in View.java :
http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;f=core/java/android/view/ViewGroup.java;h=e686d1c20bd21eaa050ff3bf9187b549ee7b1355;hb=HEAD
I can see this kind of code which would be much easier implemented as
an ArrayList :
1867 private void addInArray(View child, int index) {
1868 View[] children = mChildren;
1869 final int count = mChildrenCount;
1870 final int size = children.length;
1871 if (index == count) {
1872 if (size == count) {
1873 mChildren = new View[size +
ARRAY_CAPACITY_INCREMENT];
1874 System.arraycopy(children, 0, mChildren, 0,
size);
1875 children = mChildren;
1876 }
1877 children[mChildrenCount++] = child;
1878 } else if (index < count) {
1879 if (size == count) {
1880 mChildren = new View[size +
ARRAY_CAPACITY_INCREMENT];
1881 System.arraycopy(children, 0, mChildren, 0,
index);
1882 System.arraycopy(children, index, mChildren,
index + 1, count - index);
1883 children = mChildren;
1884 } else {
1885 System.arraycopy(children, index, children, index
+ 1, count - index);
1886 }
1887 children[index] = child;
1888 mChildrenCount++;
1889 } else {
1890 throw new IndexOutOfBoundsException("index=" + index
+ " count=" + count);
1891 }
1892 }
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