Now that we've got access to the default shared prefs, let's see how to write data in and read it back out. To write to shared prefs, there are three steps: get the shared prefs editor, put a value in using a key string, and then apply the changes. To read from shared prefs, you just need to call a getter for the key you used to write a value. You can also specify a default value to use in case there is nothing saved in shared prefs for the key you pass in. Start by adding a key to map prefs that we'll use to save the color to use for map markers. Now add a method to map prefs to write color into shared prefs. First, get the shared prefs editor, put a string in for the marker color, and then apply the changes. Instead of calling 'apply', which writes to shared prefs asynchronously, you could use 'commit', which writes synchronously. Generally speaking, if you're on the app main thread, 'apply' is preferred. Now add a getter for the marker color shared pref. Just call into shared prefs to get a string using the marker color key, and use a value of red in case the marker color has not yet been saved, which will be the case the first time you try to get the shared prefs. Now that we can write into and read from shared prefs, let's use that capability in the app. We're using MVP in the app, so let's open map contract to add methods to save and get the marker color. Now implement those methods in map presenter control, and just pass the calls on to map prefs. Open up map activity and first write the marker color pref in the marker color dialog when the...
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