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Since we plan on using the preference values in other methods of our class, we should declare class member variables. We set them in onResume(), and then anytime, for example, we compute the total, we can look at the last known preference values retrieved by the onResume method by simply looking at the values stored inside the member variables.<\/p>\n"},"subContentId":"62b29c33-d030-417d-805f-0c106b041dc6","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"}},"pause":false,"displayType":"button","buttonOnMobile":false,"visuals":{"backgroundColor":"rgb(255, 255, 255)","boxShadow":true},"goto":{"url":{"protocol":"http:\/\/"},"visualize":false,"type":""},"label":"

Why create new member variables?<\/p>\n"},{"x":3.2751091703056767,"y":3.881610868510432,"width":16.593886462882097,"height":18.340611353711793,"duration":{"from":152.398,"to":162.398},"libraryTitle":"Text","action":{"library":"H5P.Text 1.1","params":{"text":"

Eventually these preference values we retrieve will be assigned to our class member variables (comes later in this video) \u2014 I am writing the right-hand side of the variable assignment operation first.<\/p>\n\n

Challenge<\/strong>: can you write the three assignment statements retrieving the preference values based on the keys we assigned our preference widgets in root_preferences.xml?<\/p>\n\n

Resume video when ready.<\/p>\n"},"subContentId":"e375247b-b9f0-48be-be7d-0f5214d8b144","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"}},"pause":true,"displayType":"poster","buttonOnMobile":false,"visuals":{"backgroundColor":"rgb(255, 255, 255)","boxShadow":true},"goto":{"url":{"protocol":"http:\/\/"},"visualize":false,"type":""},"label":""},{"x":10.91703056768559,"y":32.945736434108525,"width":10,"height":10,"duration":{"from":205.029,"to":215.029},"libraryTitle":"Text","action":{"library":"H5P.Text 1.1","params":{"text":"

As was alluded to in an earlier part of this lesson, we will change this to \".\" to simplify coding in the future.<\/p>\n"},"subContentId":"e71c60cb-37f6-49fe-a54c-29f2572488fa","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"}},"pause":false,"displayType":"poster","buttonOnMobile":false,"visuals":{"backgroundColor":"rgb(255, 255, 255)","boxShadow":true},"goto":{"url":{"protocol":"http:\/\/"},"visualize":false,"type":""},"label":""},{"x":5.458515283842795,"y":54.342552159146045,"width":26.943231441048038,"height":8.106577510917031,"duration":{"from":368.264,"to":370.264},"libraryTitle":"Text","action":{"library":"H5P.Text 1.1","params":{"text":"

Bigger challenge:<\/strong> can you write the code so that the state is restored only when the preference is to save the state on app close\/reopen, or when it is an orientation flip, or app deactivation\/reactivation?<\/p>\n\n

Resume video to see one possible solution.<\/p>\n"},"subContentId":"d3435b82-7e5d-4ebb-aaf0-2b3bea20a9cb","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"}},"pause":true,"displayType":"poster","buttonOnMobile":false,"visuals":{"backgroundColor":"rgb(255, 255, 255)","boxShadow":true},"goto":{"url":{"protocol":"http:\/\/"},"visualize":false,"type":""},"label":""},{"x":1.0917030567685588,"y":77.51937984496124,"width":10,"height":10,"duration":{"from":419.281,"to":429.281},"libraryTitle":"Link","action":{"library":"H5P.Link 1.3","params":{"linkWidget":{"protocol":"https:\/\/","url":"developer.android.com\/guide\/components\/activities\/activity-lifecycle"},"title":"Android Documentation: Lifecycle (when is onCreate called, when is onResume called, etc.)"},"subContentId":"f2bebc1f-e702-449b-9d6b-b48b6cecf179","metadata":{"contentType":"Link","license":"U"}},"displayType":"poster","visuals":{"backgroundColor":"rgb(0, 0, 255)","boxShadow":true},"pause":false,"buttonOnMobile":false},{"x":40.39301310043668,"y":58.13953488372093,"width":10,"height":10,"duration":{"from":565.743,"to":575.743},"libraryTitle":"Text","action":{"library":"H5P.Text 1.1","params":{"text":"

After this check of creatingActivity to see whether we should restore the state, we need to set:<\/p>\n\n

creatingActivity = false; \/\/ Insert this into line 148 according to current screen<\/pre>\n\nbecause otherwise everytime we re-enter onResume from an orientation flip or deactivate\/reactivate the app, onResume will still think it is \"creatingActivity\" where in reality it is not (we've already passed activity creation).<\/p>\n"},"subContentId":"282a9acf-0899-447c-a96b-74fe9dd723a7","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"}},"pause":false,"displayType":"button","buttonOnMobile":false,"visuals":{"backgroundColor":"rgb(255, 255, 255)","boxShadow":true},"goto":{"url":{"protocol":"http:\/\/"},"visualize":false,"type":""},"label":"
I missed something important!  Can you guess?<\/p>\n"},{"x":26.200873362445414,"y":77.51937984496124,"width":10,"height":10,"duration":{"from":644.793,"to":654},"libraryTitle":"Link","action":{"library":"H5P.Link 1.3","params":{"linkWidget":{"protocol":"https:\/\/","url":"conestoga.desire2learn.com\/"},"title":"Watch the final part (at last)!"},"subContentId":"dd9b6bb5-7787-40d5-a5a1-9932f630083c","metadata":{"contentType":"Link","license":"U"}},"displayType":"poster","visuals":{"backgroundColor":"rgb(0, 0, 255)","boxShadow":true},"pause":false,"buttonOnMobile":false},{"x":2.1834061135371177,"y":36.82170542635659,"width":38.427947598253276,"height":13.100436681222709,"duration":{"from":604.501,"to":614.501},"libraryTitle":"Text","action":{"library":"H5P.Text 1.1","params":{"text":"
WARNING! Your app might not replicate this behaviour, and onCreate might be called when changing orientation, causing the data not to be restored in onResume.<\/p>\n\n
If you want to ensure that onCreate is not called for your activity when changing orientations, you can specify this under the attribute configChanges <\/em><\/strong>in the AndroidManifest.xml<\/strong> element for this activity.<\/p>\n\n
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2.6, 2.7 Create Fragments and Activities and set Preferences - Part 4 (10m54s)

Chris Lo