DroidCon NYC 2016 - A Material Design guide for Android developers

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A Material Design Guide for Android Developers Yash Prabhu @yashvprabhu github.com/yprabhu dramafever.com

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Why?

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What is Material Design?

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Skeuomorphism Flat Material @yashvprabhu

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Terminology Screen Size - small, normal, large, xlarge Screen density - ldpi, mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi Orientation - landscape/portrait Resolution - physical pixel Density Independent Pixel - virtual pixel px = dp * (dpi / 160) Example: 240 dp screen, 1 dp = 1.5 px

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Style Layout Animation Components Patterns

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Style

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Color

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Color Theme

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Color Theme Typography

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Color Theme Typography Imagery

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Color Primary 500 Primary Dark 700 Accent 500 https://material.google.com/style/color .html

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Material Palette materialpalette.com

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Theme Theme.Holo & Theme.AppCompat

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How do I apply a theme? <item name="colorPrimary">@color/color_primary</item> <item name="colorPrimaryDark">@color/color_primary_dark</item> <item name="colorAccent">@color/color_accent</item> <item name="android:windowBackground"> @color/window_background </item>

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Color & Theme Theme.AppCompat compile "com.android.support:appcompat-v7:2 4.2.1" http://developer.android.com/training/ material/theme.html#StatusBar @yashvprabhu

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Typography Use scaled pixels (sp) Min 12sp

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Custom Fonts Google Fonts fonts.google.com Chris Jenkins’ Calligraphy Library github.com/chrisjenx/Calligraphy @yashvprabhu

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Custom Fonts // Programmatically defining typefaces TextView tv= (TextView) findViewById(R.id.custom); Typeface face=Typeface.createFromAsset(getAssets(), "fonts/Verdana.ttf"); tv.setTypeface(face); // Using Chris Jenkins’ Calligraphy library

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Imagery - Palette API For extracting colors from an image compile "com.android.support:palette-v7:24.2.1" @yashvprabhu

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Palette API Bitmap myBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.chicago); if (myBitmap != null && !myBitmap.isRecycled()) { Palette.from(myBitmap).generate(paletteListener); }

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Palette API Palette.PaletteAsyncListener paletteListener = new Palette.PaletteAsyncListener(){ @Override public void onGenerated(Palette palette) { int defColor = 0x000000; int vibrant = palette.getVibrantColor(defColor); int vibrantLight = palette.getLightVibrantColor(defColor); int vibrantDark = palette.getDarkVibrantColor(defColor); int muted = palette.getMutedColor(defaultColor); int mutedLight = palette.getLightMutedColor(defaultColor); int mutedDark = palette.getDarkMutedColor(defaultColor); }}

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Imagery - Raster & Vector Specific number of pixels Uses math to draw shapes using points, lines and curves @yashvprabhu

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Imagery - Adding Vector assets

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Imagery - Scalable Vector Graphic (svg)

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Imagery - Adding Vector Assets

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Layout

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Keylines & Grids

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Keylines & Grids Device Metrics

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Keylines & Grids Device Metrics Responsive UI

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Keylines & Grids Device Metrics Responsive UI Breakpoints

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Keylines & Grids 8dp baseline grid 4dp typography grid

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Design Testing apps Keyline Pushing Material Cue @yashvprabhu

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Device metrics design.google.com/devices

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Responsive UI res/layout/main_activity.xml # For handsets res/layout-sw600dp/main_activity.xml # For tablets

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Responsive UI layout-w1024dp/show_activity.xml

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Breakpoints @yashvprabhu

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Animation

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Surface Reaction

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Surface Reaction Shadow

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Surface Reaction Ripples (indicates touch input) ?android:attr/selectableItemBackground ?android:attr/selectableItemBackgroundBor derless android:colorControlHighlight

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Shadow Elevation (lifts to your touch) ● Resting 2dp ● Raised 8dp

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Components

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Button

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Button Card

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Button Card Grid & List

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Button Card Grid & List Snackbar

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Demo github.com/yprabhu/materialworld Forked from github.com/chrisbanes/cheesesquare @yashvprabhu

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app/build.gradle compile "com.android.support:palette-v7:24.2.1" compile "com.android.support:design:24.2.1" compile "com.android.support:appcompat-v7:24.2.1" compile "com.android.support:recyclerview-v7:24.2.1" compile "com.android.support:cardview-v7:24.2.1"

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Buttons Flat Raised FAB

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Post-21 (Lollipop)

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Pre-21 (Lollipop) workaround

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FloatingActionButton (FAB) Default Elevation: 6 dp Normal size: 56 dp, Mini size: 40 dp

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FAB Widget

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Card compile 'com.android.support:cardview-v7:24.2.1' Resting elevation: 2dp Raised elevation: 8dp

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CardView

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Lists & Grids compile 'com.android.support:recyclerview-v7:24.2.1'

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RecyclerView - Under the hood Recycler View Layout Manager Adapter Dataset Item Animator @yashvprabhu

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Add RecyclerView to your layout

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Add RecyclerView item

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Set LayoutManager & Adapter // Set either of these layout managers recyclerView.setLayoutManager(new LinearLayoutManager(context)); recyclerView.setLayoutManager(new GridLayoutManager(context, GRID_SPAN)); recyclerView.setLayoutManager(new StaggeredGridLayoutManager(STAGGERED_GRID_SPAN, StaggeredGridLayoutManager.VERTICAL)); // Set adapter on recycler view recyclerView.setAdapter(new GridRecyclerViewAdapter(activity);

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Snackbar ● Swipeable, can have actions ● Single-line snackbar height: 48dp ● Multi-line snackbar height: 80dp ● Text: Roboto Regular 14sp ● Action button: Roboto Med 14sp, all-caps ● Default background fill: #323232 100%

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Snackbar Snackbar.make(view, "Archived", Snackbar.LENGTH_SHORT) .setAction(R.string.undo_string, new UndoListener()); .show();

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Patterns

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@yashvprabhu

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Appbar, Toolbar, ActionBar? @yashvprabhu

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Appbar, Toolbar, ActionBar? @yashvprabhu

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Common Pattern: Tabs @yashvprabhu

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CoordinatorLayout AppBarLayout ToolBarLayout TabLayout ViewPager FloatingActionButton @yashvprabhu

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Scrolling Behaviors CoordinatorLayout xmlns:app="http://schemas.android.com/apk/res-auto" Toolbar app:layout_scrollFlags="scroll|enterAlways|snap" ViewPager app:layout_behavior="@string/appbar_scrolling_view_behavior" @yashvprabhu

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Common Pattern: Flexible space with image @yashvprabhu

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Coordinator Layout AppBarLayout CollapsingToolbarLayout NestedScrollView FloatingActionButton ImageView Toolbar LinearLayout CardView Button @yashvprabhu

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Scrolling Behaviors CoordinatorLayout xmlns:app="http://schemas.android.com/apk/res-auto" CollapsingToolbarLayout app:layout_scrollFlags="scroll|exitUntilCollapsed" NestedScrollView app:layout_behavior="@string/appbar_scrolling_view_behavior" @yashvprabhu

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Style Layout Animation Components Patterns

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Image Credit Windows Phone - Flat design iOS Phone - Skeuomorphic design Android - Material Design Android Design Docs Android Developer docs City images @yashvprabhu

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Resources Udacity - Material Design for Android Developers Android Developer Docs - Material Design Google Material Design Guidelines Plaid app by Nick Butcher MaterialWorld (Cheesesquare by Chris Banes) Tutorials: Material Doc, Codepath, Google IO 2016 Codelabs @yashvprabhu

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A Practical Guide to Material Design Implementation Yash Prabhu @yashvprabhu github.com/yprabhu dramafever.com We’re hiring! www.jsco.re/8ns9