Program Beginner's Class Notes

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2B : Final version code

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2B :  String Data Type,  Combining Strings Together and Integer Variables Finally We cross the river and change the layouts successfully. But We can do it better by letting the price change automatically but not change after the we click the "order" button. So this is what we want to do in this class.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2B :    Plan Quantity Picker Layout Nested ViewGroups (part1, 2) Choosing the Right XML Layout Build the Quantity Picker Layout In this Part, We finished the Lesson 2A and go on to the 2B We want to rearrange the layouts to a better Views.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A : Fix the Order Button Finally, you can add new coffee by just click the "+" button, but the order button is still out of work.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A : Make the Quantity Picker Work In Last Class we still cannot fix the problem to increase the coffee quantity automatic. After the practice, now we can face the problem.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A :  Update Quantity Variable, Modify the increment() Method, Modify the decrement() Method In the last class, we found when we press the button "+" more and more, the coffee quantity just stopped at "4". And we have to figure out how to fix this problem step-by-step  in this class.

This Notes is according to the udacity free course : Android Development for Beginners The Notes below are my own notes in class. Lesson 2A :  Update a Variable in the App When you put new variable in the MainActivity.java you will get a new results when you press the button"+"

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A : Hook Up Two Buttons Today's class is to modify our JustJava app. Add two buttons on the app. Check out the layout style.  Modify the xml for work. Check out the initial value. Quantity shows "2" Price shows "10"

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A :  Debugging a Crash This part just watch video is better for understand.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A : The Need for Variable, Add Your First Variable When We change the "display" in our method,  we have to change the number one by one manually. Or may be we can set up a VARIABLE.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A : Add TextViews for Price =============================== Next Step is to check your app can change  "price" on your screen. First : Add Price and  @+id/quantity_text_view   to your layout. Second : copy those code into the MainActivity.java. paste them here under your left braces

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A :  Solving Math Problems So we know how to let our machine to display the number, and then we want to ask them to help us do some math work.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A :  Modifying First Lines of Java Code After paste up the Code on you MainActivity.java and run the button. Now, I introduce a simple concept for you.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A :  Do Something When Button is Clicked We finish the layouts arrangement and we start to enter the most important step which is let your app can interact with users.

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A : Create a New Project Plan How to Build the Layout Build layout Follow the instruction below to build up a new app called "Just Java" use empty activity .

This Notes is according to the udacity free course : Android Development for Beginners Lesson 2A : Introduction to Lesson 2 After we went through the first part of lesson 1, knows the basis of the android layouts and XML code. In the lesson 2, we keep adding some new element into our app. We will divide the course into two parts which are all about interacting with user in this lesson. First part ---- Lesson 2A build up some buttons in XML code. Second part ---- Lesson 2B how to let the button do some action with our users. >>  下一篇