No internet!! Let your apps still work
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Presented at: Cafit Reboot, Calicut We have all seen many apps which works seamlessly without internet. WhatsApp lets you see all past messages and lets you post message, delivering it as soon as it gets internet. Same for GMail, Evernote and many others. In this talk, I will talk my experience building such app and basics required for it.
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No internet!! Let your apps still work
- 6. Event-driven programming Start a java program ◦ main function runs Android ◦ User clicked on button ◦ Screen starting ◦ GPS Location changed ◦ Another app is sharing image
- 7. Activity Provides a screen Hooks for ◦ Hey, screen is starting what do you want to do ◦ Hey, screen is stopping what do you want to do ◦ Hey, screen is becoming visible / invisible what do you want to do Source: http://www.edureka.co/blog/android-tutorials-for-beginners-activity-component/
- 8. Intent & Intent Filters Intent ◦ Implicit ◦ Share a joke (text) ◦ Open maps link ◦ https://www.google.co.in/maps/place/Kozhikode,+Kerala ◦ Explicit ◦ Open another screen (activity) in my app Intent Filter ◦ Capable to share images ◦ Capable to open links to my domain Source: http://slidenerd.com/2014/10/31/android-intents-explicit-and-implicit-intents/
- 9. Manifest file Way to tell requirement & capabilities of your app ◦ Activities ◦ Services, Receivers ◦ Permissions ◦ Want to know precise location of user ◦ Feature ◦ Device should have camera
- 12. Broadcast Receivers Trigger ◦ Let me know, when device is put on charging ◦ Let me know, when SMS is received Perform some logic ◦ Start an activity ◦ Send data to server
- 13. Layouts
- 14. Threads One main execution thread ◦ Should not be blocked ◦ UI manipulation can happen only here Long running operations ◦ Done on different thread
- 15. Android Essentials Crash reporting ◦ ACRA, Crashlytics, Crittercism Analytics ◦ Google Analytics, Flurry, Mixpanel JSON (de-)serialization ◦ Gson HTTP library ◦ Retrofit, Volley, Loopj Push notifications ◦ GCM ◦ Parse, CleverTap, Moengage, Qgraph Image handling ◦ Picasso Install Tracking ◦ TUNE, AppsFlyer
- 16. Data Storage Key-Value pairs ◦ SharedPreferences ◦ “organization”: ”Cafit”; “conference”: “Reboot” ◦ Single value items e.g. user preferences Files Relational data ◦ Out of the box: SQLite ◦ Multiple rows of data ◦ Normalized data form
- 17. Connecting to your server Basics ◦ AsyncTask ◦ HttpURLConnection Libraries ◦ Retrofit by Square ◦ Volley ◦ Loopj
- 18. Sync Framework Provides ◦ Robust framework out of the box ◦ Automated network checking ◦ Improved battery performance ◦ Scheduling, Retries Implementation ◦ Authenticator ◦ Content Provider ◦ Sync Adapter Resource ◦ Transferring Data Using Sync Adapters ◦ How to develop an offline-first native Android app
- 19. Authenticator Registers user in Android System (Settings > Accounts) Stub it or implement it ◦ Depends on login requirement of your server-side Extends AbstractAccountAuthenticator Register ◦ Metadata file Source: ◦ AbstractAccountAuthenticator ◦ Stub Authenticator
- 21. Content Provider What ◦ Sharing data with other apps ◦ Accessing data of other apps ◦ E.g. Contacts, Calendar ◦ More structured way to access own data Resources ◦ Content Provider ◦ Stub provider ◦ Simple provider – Great library to start Advanced cases ◦ Joining tables ◦ Visibility handling
- 23. Bound service
- 25. Sync Adapter – When to run When server data changes ◦ GCM ◦ ContentResolver.requestSync() When device data changes ◦ Content Provider detects change ◦ ContentObserver.onChange() Periodically ◦ At regular intervals ◦ Specific times of day ◦ ContentResolver.addPeriodicSync() On demand ◦ In response to user’s action ◦ ContentResolver.requestSync()
- 26. Additional benefits Loaders ◦ Asynchronous loading of data ◦ Auto refresh on content change ◦ Plugs in well with ContentProvider and Cursors ◦ https://developer.android.com/guide/components/loaders.html Sharing data across apps System checks connectivity for you