TrendingMoviesActivity loads as a blank screen / empty list when launched 24 hours after the last launch successful launch.

Should display last known list of movies with a snackbar message telling the user about the stale data.

Steps to reproduce

1. Launch the app
2. Confirm trending movies list loads as expected
3. Close the app
4. Open device settings
5. System -> Date & time
6. Uncheck 'Use network-provided time'
7. Set date to tomorrow (+1 day)
8. Launch the app again

Expected: App displays the last known list of movies with the following snackbar message:

This list {n} day(s) old. Connect for an update! [Okay]

Actual: App shows a blank screen

TrendingMoviesActivity loads as a blank screen / empty list on initial launch without network connection (airplane mode)

Would be appropriate to display an oops message on screen for this scenario.

Steps to reproduce

1. Fresh app install
2. Enable airplane mode
3. Launch app

Expected: App displays a message to the user:

⚠️ Sorry! Connect to WiFi or mobile network to see today's trending movies"

Actual: App shows a blank screen

SharedPreferences isn't thread safe and seems to cause a StrictMode policy violation every time the app reads from it. Upgrade to Jetpack DataStore.

Jetpack DataStore: https://developer.android.com/topic/libraries/architecture/datastore

DiskStoreViolation

2021-05-26 16:00:20.970 31776-31776/com.evanisnor.flickwatcher D/StrictMode: StrictMode policy violation; ~duration=1800 ms: android.os.strictmode.DiskReadViolation
        at android.os.StrictMode$AndroidBlockGuardPolicy.onReadFromDisk(StrictMode.java:1556)
        at libcore.io.BlockGuardOs.access(BlockGuardOs.java:69)
        at libcore.io.ForwardingOs.access(ForwardingOs.java:73)
        at android.app.ActivityThread$AndroidOs.access(ActivityThread.java:7246)
        at java.io.UnixFileSystem.checkAccess(UnixFileSystem.java:281)
        at java.io.File.exists(File.java:815)
        at android.app.ContextImpl.getDataDir(ContextImpl.java:2340)
        at android.app.ContextImpl.getPreferencesDir(ContextImpl.java:590)
        at android.app.ContextImpl.getSharedPreferencesPath(ContextImpl.java:787)
        at android.app.ContextImpl.getSharedPreferences(ContextImpl.java:439)
        at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:178)
        at com.evanisnor.flickwatcher.cache.CacheModule.sharedPreferences(CacheModule.kt:38)
        at com.evanisnor.flickwatcher.cache.CacheModule_SharedPreferencesFactory.sharedPreferences(CacheModule_SharedPreferencesFactory.java:33)
        at com.evanisnor.flickwatcher.cache.CacheModule_SharedPreferencesFactory.get(CacheModule_SharedPreferencesFactory.java:25)
        at com.evanisnor.flickwatcher.cache.CacheModule_SharedPreferencesFactory.get(CacheModule_SharedPreferencesFactory.java:11)
        at com.evanisnor.flickwatcher.cache.CacheRepository_Factory.get(CacheRepository_Factory.java:37)
        at com.evanisnor.flickwatcher.cache.CacheRepository_Factory.get(CacheRepository_Factory.java:12)
        at dagger.internal.DoubleCheck.get(DoubleCheck.java:47)
        at com.evanisnor.flickwatcher.cache.DaggerCacheComponent.getCache(DaggerCacheComponent.java:60)
        at com.evanisnor.flickwatcher.trendingmovies.DaggerTrendingMoviesComponent$com_evanisnor_flickwatcher_cache_CacheComponent_getCache.get(DaggerTrendingMoviesComponent.java:102)
        at com.evanisnor.flickwatcher.trendingmovies.DaggerTrendingMoviesComponent$com_evanisnor_flickwatcher_cache_CacheComponent_getCache.get(DaggerTrendingMoviesComponent.java:93)
        at com.evanisnor.libraries.viewmodelfactory.ViewModelFactoryModule_ViewModelFactoryFactory.get(ViewModelFactoryModule_ViewModelFactoryFactory.java:25)
        at com.evanisnor.libraries.viewmodelfactory.ViewModelFactoryModule_ViewModelFactoryFactory.get(ViewModelFactoryModule_ViewModelFactoryFactory.java:10)
        at com.evanisnor.flickwatcher.trendingmovies.TrendingMoviesModule_ViewModelFactory.get(TrendingMoviesModule_ViewModelFactory.java:29)
        at com.evanisnor.flickwatcher.trendingmovies.TrendingMoviesModule_ViewModelFactory.get(TrendingMoviesModule_ViewModelFactory.java:10)
        at dagger.internal.DoubleCheck.get(DoubleCheck.java:47)
        at com.evanisnor.flickwatcher.trendingmovies.DaggerTrendingMoviesComponent.injectTrendingMoviesActivity(DaggerTrendingMoviesComponent.java:55)
        at com.evanisnor.flickwatcher.trendingmovies.DaggerTrendingMoviesComponent.inject(DaggerTrendingMoviesComponent.java:51)
        at com.evanisnor.flickwatcher.trendingmovies.TrendingMoviesActivity.onCreate(TrendingMoviesActivity.kt:133)
        at android.app.Activity.performCreate(Activity.java:7802)
        at android.app.Activity.performCreate(Activity.java:7791)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    	at com.android.internal.os.ZygoteInit.mai