第二十一周ARTS总结

Algorithm

• Swap Nodes in Pairs (opens new window)

0ms | 100.00% Run time
34.2MB | 100.00% Memory

public ListNode swapPairs(ListNode head) {
    ListNode changedNode = new ListNode(-1);
    changedNode.next = head;

    ListNode initNode = changedNode;

    while (changedNode.next != null) {
        ListNode next = changedNode.next;
        ListNode nnext = next.next;

        // 交换相邻两节点
        if (nnext != null) {
            changedNode.next = nnext;

            ListNode temp = nnext.next;
            nnext.next = next;
            next.next = temp;
        }

        changedNode = next;
    }

    return initNode.next;
}

static class ListNode {
    int val;
    ListNode next;

    ListNode(int x) {
        val = x;
    }
}

Review

• Activity and Fragment Layouts with AndroidX (opens new window)

Tip

• 关于处理Bitmap的一些规则
  • Never keep in memory more than you actually need
  • Scaling：利用inSampleSize、inDensity、inTargetDensity来显示图片，而不是复制一份图片做变换
  • Decode a specific region
  • Getting image size
  • ImageDecoder

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