Java	Kotlin	Flutter	ReactNative
Tutorials	Recap/Beginner	Language , For Android	Flutter	Expo , ReactNative
EventListener	OnClickListener
	Fragment	Fragment	Fragment
	ActionBar	ActionBar
	RecyclerView	RecyclerView	RecyclerView
	RecyclerView & Search	RecyclerView & Search	RecyclerView & Search
HTTP RetroFit 1.9 vs 2.0 , HTTP Libs , GsonConverterFactory
	RetroFit 1.9 Get , RetroFit 2.0 Get	RecyclerView & RetroFit , Tutorials	RecyclerView & Chopper
	RecyclerView & RetroFit & MultiMedia	RecyclerView & RetroFit & MultiMedia
	HTTP Requests with Auth	HTTP Requests with Auth	HTTP Request , HTTP Requests with Auth
	OkHttp3 Get , OkHttp3 Post MultiPart	OkHttp3	HTTP
	Volley	Volley	DIO
	Speech	Speech	Speech
	Google Android Maps API	Map
	Cloud Messaging	FCM
			Login
	Social Media Signup	Google SignIn , FireBase Google SignIn , FB SignIn
	WebView & Email	WebView & Email	WebView & Email
	App Link	App Link	App Link	https://github.com/atabegruslan/Notes/wiki/App-Links#in-react-native
	Device Admin
	Service
	HotSpot
	InApp Purchase
	Pay
	PlayStore
	Google Analytics
Dependency Injection
Dagger	Simplest Demo	Simplest Demo
Thread Options
AsyncTask Bad	AsyncTask
Executor
ReactiveX, Illustration	RxJava , RxJava Retrofit
Coroutine	X	Coroutine
JetPack AndroidX Tutorial , JetPack Tutorial
LifeCycle
ViewModel	Orientation - Old Way , Orientation - ViewModel
LiveData	LiveData
ROOM	ROOM & CRUD
	MVVM ROOM Retrofit	MVVM ROOM Retrofit Dagger2 Coroutines

• 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=PLk7v1Z2rk4hjxP_CHAhjXQN3zrcEhluF_
• 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://www.mobindustry.net/blog/mvc-vs-mvp-vs-mvvm-vs-mvi-choosing-an-architecture-for-android-app/

https://github.com/atabegruslan/Notes/blob/main/notes/android/complete_uninstall.pdf

• Enable Developer options on Android phone: Settings, About phone, tap Build number 7 times.
• Enable USB debugging: Settings, Developer options, turn this on, turn on Stay awake, turn on USB debugging.
• Connect device: Press Allow on phone. Set to the appropriate USB connect options on phone. Download necessary drivers if needed.

• https://www.samsung.com/vn/apps/smart-switch/
• https://www.android.com/filetransfer/

If you cant see your phone there or in AndroidStudio's Select Deployment Target window, the most likely cause is the driver.

Start, Device Manager: If you see "other devices" with ADB Interface and Android Samsung under it with exclaimation icons beside them, then do:

• https://uptodrivers.com/samsung-galaxy-a01-usb-driver-free-download/90393/ (I have Samsung A01)
  • https://uptodrivers.com/android-usb-driver/ (Get Google USB Driver in Android Package Manager > SDK tools)
    • https://uptodrivers.com/adb-usb-drivers-free-download/ (NEED ADB Driver)
      • https://www.youtube.com/watch?v=171KC_K3W4E (Have to manually install ADB Driver)
    • https://developer.samsung.com/mobile/android-usb-driver.html (Get Android driver)

Manually install ADB Driver:

1. Device Manager
2. Right click on faulty ADB interface
3. Update Driver Software
4. Browse computer
5. Pick from a list of device drivers
6. Select the android_winusb.inf in the unzipped ADB driver that was downloaded from https://dl-ssl.google.com/android/repository/latest_usb_driver_windows.zip
7. Install

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://github.com/atabegruslan/Notes/blob/main/notes/android/storage_external.pdf

• 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.

1. Activities - With UI, foreground.
2. Services - Can block, same thread. No UI, Background. Can spawn a new thread within a service. Used for eg polling, play music, DB CRUD.
3. Thread - Don't block. Foreground or background. Preferably use if delay is >=2s. (If >5s, OS will prompt to kill)
4. 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

https://youtu.be/O0UwUF2DgQc

Hardware Accelerated Execution Manager, accelerates emulator.

https://github.com/atabegruslan/Notes/blob/main/notes/android/haxm.pdf

• https://gist.github.com/atabegruslan/206f80fb948dedd99d78a5de153fbc3b
• https://github.com/atabegruslan/Notes/blob/main/notes/android/android_detection_in_web.pdf