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Fix typos
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118 changed files with 1150 additions and 1602 deletions
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@ -50,7 +50,7 @@ class MainActivity : AppCompatActivity() {
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### Passing data between activities
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In *lauching* activity:
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In *laughing* activity:
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```kotlin
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private fun openActivity() {
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@ -58,7 +58,7 @@ private fun openActivity() {
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//target to open Intent(opener, opened)
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val intent = Intent(this, Activity::class.java)
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//pass data to lauched activity
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//pass data to launched activity
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intent.putExtra("identifier", value)
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startActivity(intent) //launch another activity
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@ -76,7 +76,7 @@ val identifier = intent.get<Type>Extra("identifier")
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### Resources Hooks
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```kotlin
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R.<resourceType>.<resourceName> //access to reource
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R.<resourceType>.<resourceName> //access to resource
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ContextCompat.getColor(this, colorResource) //extract color from resources
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getString(stringResource) //extract string from resources
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@ -98,14 +98,14 @@ in `Activity.kt`:
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```kotlin
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var element = findViewById(R.id.<id>) //old method
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<id>.poperty = value //access and modify view contents
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<id>.popery = value //access and modify view contents
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```
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## Activity Components
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### Snackbar
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Componed derived from material design. If using old API material design dependency must be set in gradle.
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Component derived from material design. If using old API material design dependency must be set in gradle.
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In `build.gradle (Module:app)`:
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@ -144,10 +144,10 @@ startActivity(intent)
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val intent = Intent(Intent.ACTION_SEND)
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intent.setType("text/plain") //specifying shared content type
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intent.putExtra(Intent.EXTRA_MAIL, "mail@address") //open mail client and precompile field if share w/ mail
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intent.putExtra(Intent.EXTRA_MAIL, "mail@address") //open mail client and pre-compile field if share w/ mail
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intent.putExtra(Intent.EXTRA_SUBJECT, "subject")
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intent.putExtra(Intent.EXTRA_TEXT, "text") //necessary since type is text
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startActivity(Initent.startChooser(intent, "chooser title")) //let user choose the share app
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startActivity(Intent.startChooser(intent, "chooser title")) //let user choose the share app
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```
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### App Google Maps
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@ -186,21 +186,22 @@ In `AndroidManifest.xml`:
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//https://developer.android.com/training/permissions/requesting
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//intercept OS response to permission popup
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override fun onRequestPermissionResult(requestCode: Int, permissins: Array<out String>, grantResults: IntArray) {
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override fun onRequestPermissionResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
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super.onRequestPermissionsResult(requestCode, permissions, grantResults)
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}
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fun checkCallPermission() {
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//check if permission to make a call has been granted
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if (ContextCompact.checkSelfPermission(context!!, android.Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
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// i permission has not been granted request it (opens OS popup, no listener aviable)
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ActivityCompat.requestPermissions(context!!, arrrayOf(android.Manifest.permission.CALL_PHONE), requestCode) //request code neeeds to be specific for the permission
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// if permission has not been granted request it (opens OS popup, no listener available)
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// request code needs to be specific for the permission
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ActivityCompat.requestPermissions(context!!, arrayOf(android.Manifest.permission.CALL_PHONE), requestCode)
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} else {
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call() //if permission has been already given
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}
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}
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@SuppressLint("MissingPermission") // suppress warnig of unhandled permission (handled in checkCallPermission)
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@SuppressLint("MissingPermission") // suppress warning of unhandled permission (handled in checkCallPermission)
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fun call() {
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val intent = Intent(Intent.ACTION_DIAL, Uri.parse("tel: <phone number>"))
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startActivity(intent)
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@ -230,11 +231,11 @@ recycleView.LayoutManager = layoutManager // assign LayoutManager for the recyc
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// handle adapter var containing null value
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if (array != null) {
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adapter = RecyclerViewItemAdapter(array!!) // valorize adapter with a adaper object
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recyclerView.adapter = adapter // assing adapter to the recyclerView
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adapter = RecyclerViewItemAdapter(array!!) // valorize adapter with a adapter object
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recyclerView.adapter = adapter // assign adapter to the recyclerView
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}
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// add or remom item
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// add or remove item
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// tell the adapter that something is changed
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adapter?.notifyDataSetChanged()
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@ -247,7 +248,7 @@ adapter?.notifyDataSetChanged()
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```kotlin
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webView.webViewClient = object : WebViewClient() {
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// avoid openiing browsed by default, open webview instead
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// avoid opening browsed by default, open webview instead
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override fun shouldOverrideUrlLoading(view: WebView?, url: String?): Boolean {
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view?.loadUrl(url) // handle every url
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return true
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@ -261,7 +262,7 @@ webView.webViewClient = object : WebViewClient() {
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}
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Intent(Intent.ACTION_VIEW, Uri.parse(url).apply){
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startActivity(this) // open br br owser/app when the website changes to external URL
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startActivity(this) // open browser/app when the website changes to external URL
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}
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return true
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}
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@ -291,7 +292,7 @@ Import in `build.gradle`:
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implementation 'com.android.volley:volley:1.1.1'
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```
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Perrmissions in `AndroidManifest.xml`:
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Permissions in `AndroidManifest.xml`:
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```xml
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<uses-permission android:name="android.permission.INTERNET" />
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@ -299,7 +300,7 @@ Perrmissions in `AndroidManifest.xml`:
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### Make the request
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Subsequnt requests sould be delayed to avoid allowing the user to make too frequent requests.
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Subsequent requests should be delayed to avoid allowing the user to make too frequent requests.
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```kotlin
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private lateinit var queue: RequestQueue
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@ -358,14 +359,14 @@ private fun getJSONArrayRequest(){
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override fun onStop() {
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super.onStop()
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queue?.cancellAll("TAG") // delete all request with a particular tag when the activity is closed (avoid crash)
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queue?.cancelAll("TAG") // delete all request with a particular tag when the activity is closed (avoid crash)
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}
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```
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### Parse JSON Request
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```kotlin
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Response.Litener { response ->
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Response.Listener { response ->
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var value = response.getSting("key")
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}
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```
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@ -374,19 +375,19 @@ Response.Litener { response ->
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### Singleton
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Object instantiated during app init and is destroid only on app closing. It can be used for data persistance since is not affected by the destruction of an activity.
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Object instantiated during app init and is destroyed only on app closing. It can be used for data persistance since is not affected by the destruction of an activity.
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```kotlin
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// Context: Interface to global information about an application environment.
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class Singleton consturctor(context: Context) {
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class Singleton constructor(context: Context) {
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companion object {
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@Volatile
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private var INSTANCE: Singleton? = null
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// syncronized makes sure that all instances of the singleton are actually the only existing one
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fun getInstance(context: Contecxt) = INSTANCE ?: syncronized(this) {
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// synchronized makes sure that all instances of the singleton are actually the only existing one
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fun getInstance(context: Context) = INSTANCE ?: synchronized(this) {
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INSTANCE ?: Singleton(context).also {
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INSTANCE = it
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}
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@ -26,10 +26,10 @@ class RecipeAdapter : RecyclerView.Adapter<RecipeAdapter.ViewHolder> {
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}
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}
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//adapter contructor, takes list of data
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//adapter contractor, takes list of data
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constructor(myDataset: ArrayList<Recipe>/*, mContext: Context?*/){
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mDataset = myDataset
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//mContenxt = mContext
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//mContext = mContext
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}
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@ -18,18 +18,18 @@ android {
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}
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```
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## Distribuiting the app
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## Distributing the app
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### APK vs Bundle
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- APK: android executable, contains all assets of the app (multiplr versions for each device). The user downloads all the assets.
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- Bundle: split the assets based on dedvice specs. The users donwloads only the assest needed for the target device.
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- APK: android executable, contains all assets of the app (multiple versions for each device). The user downloads all the assets.
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- Bundle: split the assets based on device specs. The users downloads only the assets needed for the target device.
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### APK generation & [App Signing](https://developer.android.com/studio/publish/app-signing)
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- **Key store path**: location where the keystore file will be stored.
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- **Key store password**: secure password for the keystore (**to be rememberd**).
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- **Key alias**: identifying name for the key (**to be rememberd**).
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- **Key password**: secure password for the key (**to be rememberd**).
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- **Key store password**: secure password for the keystore (**to be remembered**).
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- **Key alias**: identifying name for the key (**to be remembered**).
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- **Key password**: secure password for the key (**to be remembered**).
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The ketstore identifies the app and it's developers. It's needed for APK generation and releases distribution.
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The keystore identifies the app and it's developers. It's needed for APK generation and releases distribution.
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@ -2,13 +2,13 @@
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[Google Maps Docs](https://developers.google.com/maps/documentation/android-sdk/intro)
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Activity sould be **Google Maps Activity**.
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Activity should be **Google Maps Activity**.
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In `google_maps_api.xml`:
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```xml
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<resources>
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<string name="google_maps_key" templateMergeStartegy="preserve", translateble="false">API_KEY</string>
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<string name="google_maps_key" templateMergeStrategy="preserve", translatable="false">API_KEY</string>
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</resources>
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```
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@ -63,7 +63,7 @@ class MapsActivity : AppCompatActivity(), OnMapReadyCallback,
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mMap.setOnInfoWindowClickListener(this)
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// Add a marker and move the camera
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val location = LatLng(-34.0, 151.0) // set loaction with latitude and longitude
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val location = LatLng(-34.0, 151.0) // set location with latitude and longitude
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mMap.addMarker(MarkerOptions().position(location).title("Marker in ...")) // ad the marker to the map with a name and position
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mMap.moveCamera(CameraUpdateFactory.newLatLng(location)) // move camera to the marker
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@ -31,17 +31,17 @@ class DatabaseHelper(
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Make data persistent.
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```kotlin
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class AppSingleton consturctor(context: Context) {
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class AppSingleton constructor(context: Context) {
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var dataabse: SQLiteDatabase? = null // point to database file in memory
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var database: SQLiteDatabase? = null // point to database file in memory
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companion object {
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@Volatile
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private var INSTANCE: AppSingleton? = null
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// syncronized makes sure that all instances of the singleton are actually the only existing one
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fun getInstance(context: Contecxt) = INSTANCE ?: syncronized(this) {
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// synchronized makes sure that all instances of the singleton are actually the only existing one
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fun getInstance(context: Context) = INSTANCE ?: synchronized(this) {
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INSTANCE ?: Singleton(context).also {
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INSTANCE = it
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}
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@ -75,10 +75,10 @@ override fun onCreate() {
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Controller to handle data from the objects and interact with the Database
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```kotlin
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sqLiteDatabse = AppISngleton.getInstance().database // reference to the database from the singleton
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sqLiteDatabase = AppISingleton.getInstance().database // reference to the database from the singleton
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contentValues = ContentValues() // dict like structure to insert data in DB
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contentValuest.put("DB_Column", value) // put data in the structure
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contentValues.put("DB_Column", value) // put data in the structure
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// insertion query V1
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sqLiteDatabase?.insert("table", null, contentValue)
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@ -4,7 +4,7 @@
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### Colors, Style, Strings
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These resorsces are located in `app/src/main/res/values/<resource_type>.xml`
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These resources are located in `app/src/main/res/values/<resource_type>.xml`
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`@color/colorName` -> access to *color definition* in `colors.xml`
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`@string/stringName` -> access to *string definition* in `strings.xml` (useful for localization)
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`@style/styleName` -> access to *style definition* in `styles.xml`
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@ -65,7 +65,7 @@ A **View Group** or **Layout** is a container of Views.
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```
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`android:layout_width`, `android:layout_heigth`:
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`android:layout_width`, `android:layout_height`:
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* fixed value (dp, sp)
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* match_parent
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@ -141,7 +141,7 @@ Layout that arranges other views either horizontally in a single column or verti
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```xml
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<!--ID is necessary for identification -->
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<View
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android:id="@+id/uniquieId"
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android:id="@+id/uniqueId"
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android:layout_width="value"
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android:layout_height="value"
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/>
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@ -164,7 +164,7 @@ The scroll view can only have one child. If the child is a layout than the layou
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```xml
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<ScrollView
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android:id="@+id/uniquieId"
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android:id="@+id/uniqueId"
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android:layout_width="value"
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android:layout_height="value">
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<!-- single child -->
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