03 SharedPreferences

Create four square Views, one in each corner of the UI.

• You may use any View type you wish

  • Bonus use at least 2 different types such as 2 Buttons and 2 TextViews

Implement View.OnClickListener in MainActivity.java

Assign same onClick event listener to each View

• Display the number of clicks for each View 

• Store the values of each View onto the device using SharedPreferences

  • Either store the values in variables or use the getText()/setText() methods to access and track the values.  Then store to SharedPreferences. (If you use the latter, remember to parse the String values to int's when performing calculations.)

  • For extra fun, store to SharePreferences using the View's ID or tag. (You must assign a tag to each View to use the latter option.)

  • Storing and Accessing SharedPreferences

  • Shared Preferences in Android with Example

  • Don't forget to review the developer site

  • Tutorial which may be helpful:

    1. codelabs: Shared preferences 

• In the onResume() event handler, set the initial values by retrieving from SharedPreferences

  • Test by closing your app, reopening, and observing the values (should be the same as values at the time of closing)

• Bonus: display the clicks per second in a Toast

Add a SeekBar

• Shared Preferences in Android with Example

• Slider changes the font size in the Views

• When SeekBar tracking stops, pop a message using Snackbar that shows which shows the font size selected

  • Bonus: Add an undo action which will revert to previous font size and reset the SeekBar location to its last position

  • Snackbars

    1. Android Snackbar Example 

Reset

• Set an OnLongClickListener on the layout to clear SharedPreferences and reset the app

Build and Run your app on device

• Video capture your app

Build the .apk file

• Rename the .apk file 

• PeriodLabNumberLastFirstCustomName.apk  

• P8L03aTraDan4Corners.apk

Submit assignment

• Video

• .apk file

• Classes: MainActivity.java

• Layouts: activity_main.xml

• Values: strings.xml

• Values: dimens.xml

Custom ideas and demo

• Customize as you desire...

Submit as Lab03b

• P8L03bTraDan4Corners.apk

• Video