Mobile Development - atabegruslan/Notes GitHub Wiki
- Comparison of technologies: https://academind.com/tutorials/react-native-vs-flutter-vs-ionic-vs-nativescript-vs-pwa/
- https://www.youtube.com/playlist?list=PLgCYzUzKIBE_cyEsXgIcwC3P8ipvlSFd_ (Firebase)
- https://www.youtube.com/playlist?list=PLrnPJCHvNZuARS1W7qMt-zxBNqWYZpOg6 (animation)
- https://www.youtube.com/playlist?list=PLgCYzUzKIBE_ZuZzgts135GuLQNX5eEPk (test)
- https://www.youtube.com/playlist?list=PLgCYzUzKIBE-xYch_APQy_wR9JBlnp9Hg (test)
- https://www.raywenderlich.com/817602-mvi-architecture-for-android-tutorial-getting-started (MVI)
https://github.com/atabegruslan/Notes/blob/main/notes/android/complete_uninstall.pdf
android.* : packages that are bundled with the Android operating system
androidx.* : packages that are packaged with your app's APK
https://stackoverflow.com/questions/51280090/what-is-androidx
AndroidX = Existing support libraries (re-organized) + JetPack. (JetPack is made of androidx.* libraries.)
- https://developer.android.com/topic/libraries/support-library
- https://developer.android.com/jetpack
- https://stackoverflow.com/questions/50251658/what-exactly-is-android-jetpack
- https://github.com/atabegruslan/Notes/blob/main/notes/android/storage_options.pdf
- eg: Write to SD Card folder:
File sdCard = Environment.getExternalStorageDirectory();
File dir = new File (sdCard.getAbsolutePath() + "/dir1/dir2");
dir.mkdirs();
File file = new File(dir, "filename");
FileOutputStream f = new FileOutputStream(file);
- https://www.youtube.com/watch?v=3tzEcB-GOKI
- https://www.youtube.com/watch?v=JiTn9wsiGsc
- https://www.gizbot.com/how-to/tips-tricks/how-to-find-your-phone-s-screen-density-value-043500.html
- https://blog.prototypr.io/designing-for-multiple-screen-densities-on-android-5fba8afe7ead
- https://stackoverflow.com/questions/2025282/what-is-the-difference-between-px-dip-dp-and-sp#:~:text=The%20conversion%20of%20dp%20units,on%20screens%20with%20different%20densities.&text=dp%20is%20dip%20.
- https://stackoverflow.com/questions/18077325/scale-image-to-fill-imageview-width-and-keep-aspect-ratio
- https://stackoverflow.com/questions/7506230/set-position-size-of-ui-element-as-percentage-of-screen-size
Just like Java runs on JVM, Android runs on Dalvik VM.
Android's DexCode is like Java ByteCode
https://github.com/atabegruslan/Notes/tree/main/notes/android/Gradle
Build Type: debug, release
Flavour: eg: Free, paid
Build variants: Build Types & Flavours.
- https://wajahatkarim.com/2018/04/difference-between-build-type-flavour-and-build-variant-in-android/
- https://developer.android.com/studio/build/build-variants
App components are the essential building blocks of an Android app.
Each component is an entry point through which the system or a user can enter your app.
Some components depend on others.
- Activities - With UI, foreground.
- Services - Can block, same thread. No UI, Background. Can spawn a new thread within a service. Used for eg polling, play music, DB CRUD.
- Thread - Don't block. Foreground or background. Preferably use if delay is >=2s. (If >5s, OS will prompt to kill)
- Broadcast receivers - Listen for an broadcast intent (like the phone ringing, or an SMS is received)
Content providers - In front of DB/storage.
Intent: A messaging object. It requests an action to be performed by another app component.
Intent Filter: Tells app's components (eg activity) which intent to respond to.
Other apps can potentially start that activity with the right intent.
https://stackoverflow.com/questions/6578051/what-is-an-intent-in-android/1
- Explicit intent - Component to Component.
- Implicit intent - Component into another app, eg send mail.
- Pending intent - Component into another app. The other app can exec it in the future, even if the calling component is gone. The other app exec it with the same permissions.
IntentService - related to Service on a different thread.
https://github.com/atabegruslan/Notes/blob/main/notes/android/intent_service.pdf
- https://github.com/atabegruslan/Notes/blob/main/notes/android/context.pdf
- https://medium.com/susheel-karam/different-ways-to-get-context-in-android-8018d9663292
ViewGroup is subclass of View. Views can hold Views and ViewGroups.
ViewGroups are Layouts.
Widgets extends View. Widgets are eg Button, TextView, etc...
Lock Screen Orientation - in manifest: android:screenOrientation="portrait"
<string-array name="xxx"><item>string1</item> can be used in strings.xml to store a long array. Java arrays are used to store short arrays.
Linear Layout - forms
Relative Layout - all view pos rel to each other
Table Layout - table. Cant scroll
GridView - two-dimensional, scrollable grid. Thumbnail gallery. Adapter pull content into this view
ListView - scrollable items. eg menu. Adapter pull content into this view
AbsoluteLayout enables you to specify the exact location of its children.
FrameLayout is a placeholder on screen that you can use to display a single view.
TabLayout - 1 activity many panes
DexGuard and ProGuard are for obfuscation
https://www.guardsquare.com/en/blog/proguard-vs-dexguard
- https://coderwall.com/p/r09hoq/android-generate-release-debug-keystores
- https://stackoverflow.com/questions/55199078/difference-between-google-api-debug-and-release-keys
- https://developer.android.com/studio/publish/preparing
- https://developer.android.com/studio/publish/app-signing
- https://github.com/Ruslan-Aliyev/Travel-Blog-Android#for-google-signin-sha1-certificate-fingerprint
Hardware Accelerated Execution Manager, accelerates emulator.
https://github.com/atabegruslan/Notes/blob/main/notes/android/haxm.pdf