public E valueAt(int index) {
        return (E) mArray[index];
    }
Return the value at the given index in the array.

@param index The desired index, must be between 0 and {@link #size()}-1.
@return Returns the value stored at the given index.
replugin-host-library/replugin-host-lib/src/main/java/com/qihoo360/replugin/utils/basic/ArraySet.java