Summary Android Notes For Professionals

Contents
About ................................................................................................................................................................................... 1
Chapter 1: Getting started with Android ........................................................................................................... 2
Section 1.1: Creating a New Project .............................................................................................................................. 2
Section 1.2: Setting up Android Studio ....................................................................................................................... 13
Section 1.3: Android programming without an IDE .................................................................................................. 14
Section 1.4: Application Fundamentals ...................................................................................................................... 18
Section 1.5: Setting up an AVD (Android Virtual Device) ......................................................................................... 19
Chapter 2: Android Studio ...................................................................................................................................... 23
Section 2.1: Setup Android Studio .............................................................................................................................. 23
Section 2.2: View And Add Shortcuts in Android Studio .......................................................................................... 23
Section 2.3: Android Studio useful shortcuts ............................................................................................................ 24
Section 2.4: Android Studio Improve performance tip ............................................................................................ 25
Section 2.5: Gradle build project takes forever ........................................................................................................ 26
Section 2.6: Enable/Disable blank line copy ............................................................................................................ 26
Section 2.7: Custom colors of logcat message based on message importance ................................................. 27
Section 2.8: Filter logs from UI ................................................................................................................................... 28
Section 2.9: Create filters configuration ................................................................................................................... 29
Section 2.10: Create assets folder .............................................................................................................................. 30
Chapter 3: Instant Run in Android Studio ....................................................................................................... 32
Section 3.1: Enabling or disabling Instant Run .......................................................................................................... 32
Section 3.2: Types of code Swaps in Instant Run .................................................................................................... 32
Section 3.3: Unsupported code changes when using Instant Run ......................................................................... 33
Chapter 4: TextView ................................................................................................................................................. 34
Section 4.1: Spannable TextView ................................................................................................................................ 34
Section 4.2: Strikethrough TextView .......................................................................................................................... 35
Section 4.3: TextView with image .............................................................................................................................. 36
Section 4.4: Make RelativeSizeSpan align to top ..................................................................................................... 36
Section 4.5: Pinchzoom on TextView ......................................................................................................................... 38
Section 4.6: Textview with dierent Textsize ............................................................................................................ 39
Section 4.7: Theme and Style customization ............................................................................................................ 39
Section 4.8: TextView customization ......................................................................................................................... 41
Section 4.9: Single TextView with two dierent colors ............................................................................................ 44
Chapter 5: AutoCompleteTextView ................................................................................................................... 46
Section 5.1: AutoComplete with CustomAdapter, ClickListener and Filter ............................................................. 46
Section 5.2: Simple, hard-coded AutoCompleteTextView ....................................................................................... 49
Chapter 6: Autosizing TextViews ......................................................................................................................... 50
Section 6.1: Granularity ............................................................................................................................................... 50
Section 6.2: Preset Sizes ............................................................................................................................................. 50
Chapter 7: ListView .................................................................................................................................................... 52
Section 7.1: Custom ArrayAdapter ............................................................................................................................. 52
Section 7.2: A basic ListView with an ArrayAdapter ................................................................................................ 53
Section 7.3: Filtering with CursorAdapter .................................................................................................................. 53
Chapter 8: Layouts .................................................................................................................................................... 55
Section 8.1: LayoutParams ......................................................................................................................................... 55
Section 8.2: Gravity and layout gravity .................................................................................................................... 58
Section 8.3: CoordinatorLayout Scrolling Behavior ................................................................................................. 60

, Section 8.4: Percent Layouts ...................................................................................................................................... 62
Section 8.5: View Weight ............................................................................................................................................ 63
Section 8.6: Creating LinearLayout programmatically ........................................................................................... 64
Section 8.7: LinearLayout ........................................................................................................................................... 65
Section 8.8: RelativeLayout ........................................................................................................................................ 66
Section 8.9: FrameLayout .......................................................................................................................................... 68
Section 8.10: GridLayout ............................................................................................................................................. 69
Section 8.11: CoordinatorLayout ................................................................................................................................. 71
Chapter 9: ConstraintLayout ................................................................................................................................ 73
Section 9.1: Adding ConstraintLayout to your project ............................................................................................. 73
Section 9.2: Chains ...................................................................................................................................................... 74
Chapter 10: TextInputLayout ................................................................................................................................ 75
Section 10.1: Basic usage ............................................................................................................................................ 75
Section 10.2: Password Visibility Toggles .................................................................................................................. 75
Section 10.3: Adding Character Counting ................................................................................................................. 75
Section 10.4: Handling Errors ..................................................................................................................................... 76
Section 10.5: Customizing the appearance of the TextInputLayout ...................................................................... 76
Section 10.6: TextInputEditText .................................................................................................................................. 77
Chapter 11: CoordinatorLayout and Behaviors ........................................................................................... 79
Section 11.1: Creating a simple Behavior ................................................................................................................... 79
Section 11.2: Using the SwipeDismissBehavior .......................................................................................................... 80
Section 11.3: Create dependencies between Views .................................................................................................. 80
Chapter 12: TabLayout ............................................................................................................................................. 82
Section 12.1: Using a TabLayout without a ViewPager ............................................................................................ 82
Chapter 13: ViewPager ............................................................................................................................................. 83
Section 13.1: ViewPager with a dots indicator ........................................................................................................... 83
Section 13.2: Basic ViewPager usage with fragments ............................................................................................. 85
Section 13.3: ViewPager with PreferenceFragment ................................................................................................. 86
Section 13.4: Adding a ViewPager .............................................................................................................................. 87
Section 13.5: Setup OnPageChangeListener ............................................................................................................. 88
Section 13.6: ViewPager with TabLayout .................................................................................................................. 89
Chapter 14: CardView ............................................................................................................................................... 92
Section 14.1: Getting Started with CardView ............................................................................................................. 92
Section 14.2: Adding Ripple animation ...................................................................................................................... 93
Section 14.3: Customizing the CardView ................................................................................................................... 93
Section 14.4: Using Images as Background in CardView (Pre-Lollipop device issues) ........................................ 94
Section 14.5: Animate CardView background color with TransitionDrawable ...................................................... 96
Chapter 15: NavigationView .................................................................................................................................. 97
Section 15.1: How to add the NavigationView ........................................................................................................... 97
Section 15.2: Add underline in menu elements ....................................................................................................... 101
Section 15.3: Add seperators to menu ..................................................................................................................... 102
Section 15.4: Add menu Divider using default DividerItemDecoration ................................................................ 103
Chapter 16: RecyclerView ..................................................................................................................................... 105
Section 16.1: Adding a RecyclerView ........................................................................................................................ 105
Section 16.2: Smoother loading of items ................................................................................................................. 106
Section 16.3: RecyclerView with DataBinding ......................................................................................................... 107
Section 16.4: Animate data change ......................................................................................................................... 108
Section 16.5: Popup menu with recyclerView ......................................................................................................... 112
Section 16.6: Using several ViewHolders with ItemViewType ............................................................................... 114

, Section 16.7: Filter items inside RecyclerView with a SearchView ........................................................................ 115
Section 16.8: Drag&Drop and Swipe with RecyclerView ....................................................................................... 116
Section 16.9: Show default view till items load or when data is not available .................................................... 117
Section 16.10: Add header/footer to a RecyclerView ............................................................................................ 119
Section 16.11: Endless Scrolling in Recycleview ....................................................................................................... 122
Section 16.12: Add divider lines to RecyclerView items .......................................................................................... 122
Chapter 17: RecyclerView Decorations ......................................................................................................... 125
Section 17.1: Add divider to RecyclerView ............................................................................................................... 125
Section 17.2: Drawing a Separator .......................................................................................................................... 127
Section 17.3: How to add dividers using and DividerItemDecoration .................................................................. 128
Section 17.4: Per-item margins with ItemDecoration ............................................................................................. 128
Section 17.5: ItemOsetDecoration for GridLayoutManager in RecycleView .................................................... 129
Chapter 18: RecyclerView onClickListeners ................................................................................................. 131
Section 18.1: Kotlin and RxJava example ................................................................................................................ 131
Section 18.2: RecyclerView Click listener ................................................................................................................. 132
Section 18.3: Another way to implement Item Click Listener ................................................................................ 133
Section 18.4: New Example ....................................................................................................................................... 135
Section 18.5: Easy OnLongClick and OnClick Example .......................................................................................... 136
Section 18.6: Item Click Listeners ............................................................................................................................. 139
Chapter 19: RecyclerView and LayoutManagers ..................................................................................... 141
Section 19.1: Adding header view to recyclerview with gridlayout manager ...................................................... 141
Section 19.2: GridLayoutManager with dynamic span count ............................................................................... 142
Section 19.3: Simple list with LinearLayoutManager .............................................................................................. 144
Section 19.4: StaggeredGridLayoutManager ......................................................................................................... 148
Chapter 20: Pagination in RecyclerView ...................................................................................................... 151
Section 20.1: MainActivity.java ................................................................................................................................. 151
Chapter 21: ImageView .......................................................................................................................................... 156
Section 21.1: Set tint ................................................................................................................................................... 156
Section 21.2: Set alpha .............................................................................................................................................. 157
Section 21.3: Set Scale Type ..................................................................................................................................... 157
Section 21.4: ImageView ScaleType - Center ......................................................................................................... 162
Section 21.5: ImageView ScaleType - CenterCrop ................................................................................................. 164
Section 21.6: ImageView ScaleType - CenterInside ............................................................................................... 166
Section 21.7: ImageView ScaleType - FitStart and FitEnd ..................................................................................... 168
Section 21.8: ImageView ScaleType - FitCenter ..................................................................................................... 172
Section 21.9: Set Image Resource ............................................................................................................................ 174
Section 21.10: ImageView ScaleType - FitXy ........................................................................................................... 175
Section 21.11: MLRoundedImageView.java .............................................................................................................. 177
Chapter 22: VideoView ........................................................................................................................................... 180
Section 22.1: Play video from URL with using VideoView ..................................................................................... 180
Section 22.2: VideoView Create ............................................................................................................................... 180
Chapter 23: Optimized VideoView .................................................................................................................... 181
Section 23.1: Optimized VideoView in ListView ....................................................................................................... 181
Chapter 24: WebView ............................................................................................................................................. 193
Section 24.1: Troubleshooting WebView by printing console messages or by remote debugging ................. 193
Section 24.2: Communication from Javascript to Java (Android) ...................................................................... 194
Section 24.3: Communication from Java to Javascript ........................................................................................ 195
Section 24.4: Open dialer example .......................................................................................................................... 195
Section 24.5: Open Local File / Create dynamic content in Webview ................................................................ 196

, Section 24.6: JavaScript alert dialogs in WebView - How to make them work ................................................. 196
Chapter 25: SearchView ........................................................................................................................................ 198
Section 25.1: Setting Theme for SearchView .......................................................................................................... 198
Section 25.2: SearchView in Toolbar with Fragment ............................................................................................. 198
Section 25.3: Appcompat SearchView with RxBindings watcher ......................................................................... 200
Chapter 26: BottomNavigationView ............................................................................................................... 203
Section 26.1: Basic implemetation ........................................................................................................................... 203
Section 26.2: Customization of BottomNavigationView ....................................................................................... 204
Section 26.3: Handling Enabled / Disabled states ................................................................................................. 204
Section 26.4: Allowing more than 3 menus ............................................................................................................ 205
Chapter 27: Canvas drawing using SurfaceView ..................................................................................... 207
Section 27.1: SurfaceView with drawing thread ..................................................................................................... 207
Chapter 28: Creating Custom Views ............................................................................................................... 212
Section 28.1: Creating Custom Views ...................................................................................................................... 212
Section 28.2: Adding attributes to views ................................................................................................................. 214
Section 28.3: CustomView performance tips ......................................................................................................... 216
Section 28.4: Creating a compound view ............................................................................................................... 217
Section 28.5: Compound view for SVG/VectorDrawable as drawableRight ...................................................... 220
Section 28.6: Responding to Touch Events ............................................................................................................ 223
Chapter 29: Getting Calculated View Dimensions .................................................................................... 224
Section 29.1: Calculating initial View dimensions in an Activity ............................................................................ 224
Chapter 30: Adding a FuseView to an Android Project ......................................................................... 225
Section 30.1: hikr app, just another android.view.View .......................................................................................... 225
Chapter 31: Supporting Screens With Dierent Resolutions, Sizes ................................................ 232
Section 31.1: Using configuration qualifiers ............................................................................................................. 232
Section 31.2: Converting dp and sp to pixels .......................................................................................................... 232
Section 31.3: Text size and dierent android screen sizes .................................................................................... 233
Chapter 32: ViewFlipper ........................................................................................................................................ 234
Section 32.1: ViewFlipper with image sliding .......................................................................................................... 234
Chapter 33: Design Patterns ............................................................................................................................... 235
Section 33.1: Observer pattern ................................................................................................................................. 235
Section 33.2: Singleton Class Example .................................................................................................................... 235
Chapter 34: Activity ................................................................................................................................................ 237
Section 34.1: Activity launchMode ............................................................................................................................ 237
Section 34.2: Exclude an activity from back-stack history ................................................................................... 238
Section 34.3: Android Activity LifeCycle Explained ................................................................................................ 238
Section 34.4: End Application with exclude from Recents .................................................................................... 241
Section 34.5: Presenting UI with setContentView ................................................................................................... 242
Section 34.6: Up Navigation for Activities ............................................................................................................... 243
Section 34.7: Clear your current Activity stack and launch a new Activity ......................................................... 244
Chapter 35: Activity Recognition ...................................................................................................................... 246
Section 35.1: Google Play ActivityRecognitionAPI .................................................................................................. 246
Section 35.2: PathSense Activity Recognition ........................................................................................................ 248
Chapter 36: Split Screen / Multi-Screen Activities ................................................................................... 250
Section 36.1: Split Screen introduced in Android Nougat implemented .............................................................. 250
Chapter 37: Material Design ............................................................................................................................... 251
Section 37.1: Adding a Toolbar ................................................................................................................................. 251
Section 37.2: Buttons styled with Material Design ................................................................................................. 252