github: S11.01- NewListItemLayout , S11.02-TodayListItem , S11.03- DataBinding
* The source information is from Udacity Nanodegree Program- Become an Android Developer *
S11.01- Sunshine’s New Layout:
Count and Say
https://leetcode.com/problems/count-and-say/description/
My GitHub: Count And Say
- The nth level result is from counting each digit of the result of (n-1) th level.
String to Integer (atoi)
https://leetcode.com/problems/string-to-integer-atoi/description/
github: String to Integer(atoi)
Checking point:
- null or empty string
- white spaces
- +/- sign
- calculate real value
- handle min & max
Using StringBuffer solve Reverse Integer problem
LeetCode: https://leetcode.com/problems/reverse-integer/description/
The below Solution 1 is the most popular solution we can find online.
But here is another way (Solution 2) to solve the problem with StringBuffer.
The Solution 2 is easier to understand and the code is cleaner.
Localization
* The article source is from Udacity Nanodegree Program- Become an Android Developer *
Localization
Localization (also known as Internationalization) is the adaptation of a product or service to meet the needs of a particular language, culture or desired population’s “look-and-feel”.
Making Apps More Accessible
* The article source is from Udacity Nanodegree Program- Become an Android Developer *
Accessibility refers to the design of products, devices, services, or environments for people who experience disabilities. Android provides accessibility features like
- TalkBack: It uses spoken feedback to describe the results of actions such as launching an app, and events such as notifications.
- Explore by Touch which is a system feature that works with TalkBack, allowing you to touch your device’s screen and hear what’s under your finger via spoken feedback. This feature is helpful to users with low vision.
- Accessibility settings that let you modify your device’s display and sound options, such as increasing the text size, changing the speed at which text is spoken, and more. and more.
leetcode- Rotate Image
Leetcode: https://leetcode.com/problems/rotate-image/description/
Given input matrix = [1,2,3], [4,5,6], [7,8,9] rotate the input matrix in-place such that it becomes: [7,4,1], [8,5,2], [9,6,3]
- (x, y), the affected point is
(y, n – x – 1), (n – x – 1, n – y – 1), (n – y – 1, x), “n” is the size of the matrix.
The rotate function=
(x, y) -> (y, n – x – 1) -> (n – x – 1, n – y – 1) -> (n – y – 1, x) -> (x, y). - For the i th line, we start from (i, i) ( !! in for loop j = i ) , and ends at (i, n – 2 – i).
- We only need process half of them. n/2
LeetCode – Plus One
Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. You may assume the integer do not contain any leading zero, except the number 0 itself. The digits are stored such that the most significant digit is at the head of the list.
For example:
Q1.
int[] nums = {1,2,3,4};
int[] result = plusOne(nums);
the digits are in the result array are {1,2,3,5};
AsyncTask
Original artile : https://developer.android.com/reference/android/os/AsyncTask.html
The three types used by an asynchronous task are the following:
Params, the type of the parameters sent to the task upon execution.
Progress, the type of the progress units published during the background computation.
Result, the type of the result of the background computation.
