CSC 349: Week of 9/11/17

CSC 349: The Week beginning Sept. 11

Homework:

Read and summarize the following article It's about to get tougher for cops, border agents to get at your iPhone's data

Watch the video Radio Buttons: Android Programming (by DrBFraser). Then redo your steak lab from last week, but this time generate the RadioButtons dynamically as shown in the video. Zip up the project and send it.

Due: Sept. 19
Tuesday:

Day_Time_Radio_Demo.zip xml and java for an app that allows the user to choose a day and time via two set of Radio buttons. I was asked
- How to pre-select an item. (There seemed to be an xml approach to check a radio button ahead of time (in Design), but then my user could not seem to uncheck that option. Thus I ended up doing it in Java toward the end of onCreate
```
			View rg_child = rgDay.getChildAt(1);
			RadioButton my_radio_button =(RadioButton)rg_child;
			my_radio_button.setChecked(true);
		
```
- How to clear out the choices. At first I looped over the Radio buttons in each group and used .setChecked(false) but this made it difficult for the user to re-select the choice that had just been de-selected. Then I found the RadioGroup's clearCheck() which was simpler and worked better.
Spinners.zip These files come from an app that shows two types of spinners (think drop-downs). One spinner gets values from an array in the values.xml file that is part of resources (res). The other spinner gets values from an array declared in Java.

Lab: Potato Calorie Count (source: https://www.verywell.com/how-many-calories-in-a-baked-potato-2506867)

Design an app that allows the user to determine the number of calories in a baked potato. The app will have two spinners (one for the size of the potato and one for the toppings), a button, and textview for displaying the answer. Have one spinner loaded from an array in an xml resource, and have the other spinner loaded from an array in Java.

Have a spinner that allows the user to enter the number of ounces of the baked potato. The range should go from 5 to 12. You can include half values if you want (5, 5.5, 6, ...). There are 25 calories for each ounce in a potato.

Have a spinner that allows the user to enter a topping. (Nothing, Butter, Sour Cream, Chili). Each of these will correspond to additional calories of (0, 100, 60, 75) respectively.

When the user clicks the button, determine the size of and topping on the potato and display the corresponding number of calories.

When the user changes either spinner value, either clear out the answer or recalculate.

Submit the .xml file with the array values, the .xml file for the layout, and the .java files (zipped up).

Due: Sept. 19
Thursday:

OneSeekBar.zip Demos a single SeekBar widget.

TwoSeekBars.zip Two SeekBars sharing a method.

Look1.zip (A little closer to handling multiple widgets efficiently.)

Lab: Toward an Equalizer Interface

Have a set of seek bars (at least six) that can be used to control the values of an array. Each value in the array can be in the range -12 to 12. The values should be displayed on the interface as well as stored in the (java) array. The numbers (32, 64, 125 etc.) seen above are not the values but rather are labels indicating the frequency range(?) to which each value corresponds.

Due: Sept. 21