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@cyrilmottier Launch screens From a Tap to your App

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38 sec average interaction time

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23 % apps used only once 38 sec average interaction time

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13 launches per month 23 % apps used only once 38 sec average interaction time Source: Mobile Life Research Centre, University of Stockholm & Localytics

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Polish your launching experience

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No content

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Placeholder UI /ˈpleɪshəʊldə(r) juː-aɪ/ Display core structural elements (status bar, app bar, etc.) without content until the app has loaded.

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Branded launch /ˈbrændɪd lɔːntʃ/ Display your logo or other elements that improve brand recognition to portray a brand while the app is loading.

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Branded launch Google Maps Placeholder UI Settings

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Branded launch Google Maps Placeholder UI Settings your side Choose

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Branded launch Google Maps Placeholder UI Settings

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Yes! A launch screen is intentionally boring

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Source: iOS Human Interface Guidelines, Apple If you think that following these guidelines will result in a plain, boring launch image, you’re right. Remember, the launch image doesn’t provide you with an opportunity for artistic expression. It’s solely intended to enhance the user’s perception of your app as quick to launch and immediately ready for use. “

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Timeline of a launch

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Timeline of a launch Slowed down version

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User taps on icon Timeline of a launch 1 2 3 4 5

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User taps on icon Timeline of a launch 1 2 Fit to screen animation starts 3 4 5

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User taps on icon Timeline of a launch 1 2 Fit to screen animation starts 3 4 5 Fit to screen animation ends

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User taps on icon Timeline of a launch 1 2 Fit to screen animation starts 3 4 5 Fit to screen animation ends Window switching starts

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User taps on icon Timeline of a launch 1 2 Fit to screen animation starts 3 4 5 Fit to screen animation ends Window switching starts App content finishes loading

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User taps on icon Timeline of a launch 1 2 Fit to screen animation starts 3 4 5 Fit to screen animation ends Window switching starts App content finishes loading

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1 2 3 4 5 Launcher & Intent triggering Entering animation Static launch screen Content switching / fading Application fully drawn 1 2 3 4 5

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1 2 3 5 System App Launcher & Intent triggering Entering animation Static launch screen Content switching / fading Application fully drawn 1 2 3 4 5 4

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5 The perfect launch 1 2 3 4

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1 Load and launch the app 2 Display a starting/preview window 3 Create the app process 4 Create the app object 5 Launch the main thread 6 Create the main activity 7 Inflate views 8 Lay out the screen 9 Perform the initial draw

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1 Load and launch the app 2 Display a starting/preview window 3 Create the app process 4 Create the app object 5 Launch the main thread 6 Create the main activity 7 Inflate views 8 Lay out the screen 9 Perform the initial draw

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System 1 Load and launch the app 2 Display a starting/preview window 3 Create the app process 4 Create the app object 5 Launch the main thread 6 Create the main activity 7 Inflate views 8 Lay out the screen 9 Perform the initial draw

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System App 1 Load and launch the app 2 Display a starting/preview window 3 Create the app process 4 Create the app object 5 Launch the main thread 6 Create the main activity 7 Inflate views 8 Lay out the screen 9 Perform the initial draw

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System App Cold start 1 Load and launch the app 2 Display a starting/preview window 3 Create the app process 4 Create the app object 5 Launch the main thread 6 Create the main activity 7 Inflate views 8 Lay out the screen 9 Perform the initial draw

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System App Warm start 1 Load and launch the app 2 Display a starting/preview window 3 Create the app process 4 Create the app object 5 Launch the main thread 6 Create the main activity 7 Inflate views 8 Lay out the screen 9 Perform the initial draw

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PhoneWindowManager.java Context context = mContext; try { context = context.createPackageContext(packageName, 0); context.setTheme(theme); } catch (PackageManager.NameNotFoundException e) { // Ignore } final PhoneWindow win = new PhoneWindow(context); win.setType(WindowManager.LayoutParams.TYPE_APPLICATION_STARTING); win.setFlags(/*...*/); final WindowManager.LayoutParams params = win.getAttributes(); // Tweak params ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)). addView(win.getDecorView(), params);

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PhoneWindowManager.java Context context = mContext; try { context = context.createPackageContext(packageName, 0); context.setTheme(theme); } catch (PackageManager.NameNotFoundException e) { // Ignore } final PhoneWindow win = new PhoneWindow(context); win.setType(WindowManager.LayoutParams.TYPE_APPLICATION_STARTING); win.setFlags(/*...*/); final WindowManager.LayoutParams params = win.getAttributes(); // Tweak params ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)). addView(win.getDecorView(), params); Create Context for the started application context = context.createPackageContext(packageName, 0);

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PhoneWindowManager.java Context context = mContext; try { context = context.createPackageContext(packageName, 0); context.setTheme(theme); } catch (PackageManager.NameNotFoundException e) { // Ignore } final PhoneWindow win = new PhoneWindow(context); win.setType(WindowManager.LayoutParams.TYPE_APPLICATION_STARTING); win.setFlags(/*...*/); final WindowManager.LayoutParams params = win.getAttributes(); // Tweak params ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)). addView(win.getDecorView(), params); Set the target theme context.setTheme(theme);

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PhoneWindowManager.java Context context = mContext; try { context = context.createPackageContext(packageName, 0); context.setTheme(theme); } catch (PackageManager.NameNotFoundException e) { // Ignore } final PhoneWindow win = new PhoneWindow(context); win.setType(WindowManager.LayoutParams.TYPE_APPLICATION_STARTING); win.setFlags(/*...*/); final WindowManager.LayoutParams params = win.getAttributes(); // Tweak params ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)). addView(win.getDecorView(), params); final PhoneWindow win = new PhoneWindow(context); win.setType(WindowManager.LayoutParams.TYPE_APPLICATION_STARTING); win.setFlags(/*...*/); Create new Window and set it up final WindowManager.LayoutParams params = win.getAttributes(); // Tweak params

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PhoneWindowManager.java Context context = mContext; try { context = context.createPackageContext(packageName, 0); context.setTheme(theme); } catch (PackageManager.NameNotFoundException e) { // Ignore } final PhoneWindow win = new PhoneWindow(context); win.setType(WindowManager.LayoutParams.TYPE_APPLICATION_STARTING); win.setFlags(/*...*/); final WindowManager.LayoutParams params = win.getAttributes(); // Tweak params ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)). addView(win.getDecorView(), params); ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)). addView(win.getDecorView(), params); Display the newly created Window

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Same look, different process …and that explains a lot

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$ adb logcat | grep “ActivityManager” ActivityManager: Displayed com.launchtime/.LaunchTimeActivity: +666ms API 19+

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No content

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public class LaunchTimeActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks {
 
 private static final int LOADER_YO = 0xcafe;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_launch_time); 
 getSupportLoaderManager().initLoader(LOADER_YO, null, this);
 }
 
 @Override
 public void onLoadFinished(Loader loader, Void data) {
 switch (loader.getId()) {
 case LOADER_YO:
 // ...
 break;
 }
 reportFullyDrawn();
 }
 // ... }

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public class LaunchTimeActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks {
 
 private static final int LOADER_YO = 0xcafe;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_launch_time); 
 getSupportLoaderManager().initLoader(LOADER_YO, null, this);
 }
 
 @Override
 public void onLoadFinished(Loader loader, Void data) {
 switch (loader.getId()) {
 case LOADER_YO:
 // ...
 break;
 }
 reportFullyDrawn();
 }
 // ... } reportFullyDrawn();

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public class LaunchTimeActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks {
 
 private static final int LOADER_YO = 0xcafe;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_launch_time); 
 getSupportLoaderManager().initLoader(LOADER_YO, null, this);
 }
 
 @Override
 public void onLoadFinished(Loader loader, Void data) {
 switch (loader.getId()) {
 case LOADER_YO:
 // ...
 break;
 }
 reportFullyDrawn();
 }
 // ... } SecurityException on KitKat… reportFullyDrawn();

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public final class ActivityCompatAdditions {
 
 private static final Impl IMPL;
 
 static {
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
 IMPL = new LollipopImpl();
 } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
 IMPL = new KitKatImpl();
 } else {
 IMPL = new BaseImpl();
 }
 }
 
 private ActivityCompatAdditions() {
 // No instances
 } 
 
 public static void reportFullyDrawn(Activity activity) {
 IMPL.reportFullyDrawn(activity);
 } 
 
 private interface Impl {
 void reportFullyDrawn(Activity activity);
 } 


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private static final class BaseImpl implements Impl {
 @Override
 public void reportFullyDrawn(Activity activity) {
 // No-op
 }
 }
 
 private static final class KitKatImpl implements Impl {
 @Override @TargetApi(Build.VERSION_CODES.KITKAT)
 public void reportFullyDrawn(Activity activity) {
 try {
 activity.reportFullyDrawn();
 } catch (SecurityException se) {
 // Prevent an Exception on KitKat
 }
 }
 }
 
 private static final class LollipopImpl implements Impl {
 @Override @TargetApi(Build.VERSION_CODES.KITKAT)
 public void reportFullyDrawn(Activity activity) {
 activity.reportFullyDrawn();
 }
 }
 
 }

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public class LaunchTimeActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks {
 
 private static final int LOADER_YO = 0xcafe;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_launch_time); 
 getSupportLoaderManager().initLoader(LOADER_YO, null, this);
 }
 
 @Override
 public void onLoadFinished(Loader loader, Void data) {
 switch (loader.getId()) {
 case LOADER_YO:
 // ...
 break;
 }
 
 }
 // ... } reportFullyDrawn();

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public class LaunchTimeActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks {
 
 private static final int LOADER_YO = 0xcafe;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_launch_time); 
 getSupportLoaderManager().initLoader(LOADER_YO, null, this);
 }
 
 @Override
 public void onLoadFinished(Loader loader, Void data) {
 switch (loader.getId()) {
 case LOADER_YO:
 // ...
 break;
 }
 
 }
 // ... } reportFullyDrawn();

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public class LaunchTimeActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks {
 
 private static final int LOADER_YO = 0xcafe;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_launch_time); 
 getSupportLoaderManager().initLoader(LOADER_YO, null, this);
 }
 
 @Override
 public void onLoadFinished(Loader loader, Void data) {
 switch (loader.getId()) {
 case LOADER_YO:
 // ...
 break;
 }
 }
 // ... } ActivityCompatAdditions.reportFullyDrawn(this);

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$ adb logcat | grep “ActivityManager” ActivityManager: Displayed com.launchtime/.LaunchTimeActivity: +666ms ActivityManager: Fully drawn com.launchtime/.LaunchTimeActivity: +1s440ms API 19+

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com.launchtime/.LaunchScreenActivity $ adb shell am start

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com.launchtime/.LaunchScreenActivity $ adb shell am start -W

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No content

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No content

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$ adb shell am start -W com.launchtime/.LaunchScreenActivity Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.launchtime/.LaunchScreenActivity } Status: ok Activity: com.launchtime/.LaunchScreenActivity ThisTime: 2426 TotalTime: 2426 WaitTime: 2488 Complete

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$ adb shell screenrecord /sdcard/launch.mp4 API 19+

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$ adb shell screenrecord /sdcard/launch.mp4 --bugreport API 21+

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API 21+

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API 21+

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No content

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11:16:46.666 f=26 (0)

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11:16:46.666 f=26 (0) 11:16:46.666 Frame timestamp

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11:16:46.666 f=26 (0) f=26 Frame number

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11:16:46.666 f=26 (0) (0) Dropped frames count

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11:16:46.666 f=26 (0) Frame timestamp Dropped frames count Frame number

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SystemClock.sleep(2000L) all the things \o/ in debug only…

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SystemClock.sleep(2000L) all the things \o/ in debug only…

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com.launchtime/.LaunchScreenActivity $ adb shell am start

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com.launchtime/.LaunchScreenActivity $ adb shell am start -S

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No content

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Developer options Background process limit

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Developer options Background process limit

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Force cold launch with “No background processes”

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Measure, measure and measure again!

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Use Systrace & Traceview extensively

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Lazy-load & async all the things

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In general, beware of static init & onCreate

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public class LazyProvider extends ContentProvider {
 
 private static final int MODEL = 101;
 private static final int MODEL_ID = 102;
 
 private static final UriMatcher URI_MATCHER;
 static {
 URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
 URI_MATCHER.addURI(LazyContract.AUTHORITY, "/model", MODEL);
 URI_MATCHER.addURI(LazyContract.AUTHORITY, "/model/#", MODEL_ID);
 // ...
 }
 
 private SQLiteOpenHelper mOpenHelper;
 
 @Override
 public boolean onCreate() {
 mOpenHelper = new LoadOpenHelper(getContext());
 return true;
 }
 // ...
 } LazyProvider.java

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public class LazyProvider extends ContentProvider {
 
 private static final int MODEL = 101;
 private static final int MODEL_ID = 102;
 
 private static final UriMatcher URI_MATCHER;
 static {
 URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);
 URI_MATCHER.addURI(LazyContract.AUTHORITY, "/model", MODEL);
 URI_MATCHER.addURI(LazyContract.AUTHORITY, "/model/#", MODEL_ID);
 // ...
 }
 
 private SQLiteOpenHelper mOpenHelper;
 
 @Override
 public boolean onCreate() {
 mOpenHelper = new LoadOpenHelper(getContext());
 return true;
 }
 // ...
 } LazyProvider.java private static final UriMatcher URI_MATCHER; Created at class loading but used only in CRUD…

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public abstract class LazyGetter {
 
 private final AtomicReference> mCachedValue = new AtomicReference<>(Optional.empty());
 
 public final T get() {
 Optional value = mCachedValue.get();
 if (!value.isPresent()) {
 synchronized (mCachedValue) {
 value = mCachedValue.get();
 if (!value.isPresent()) {
 mCachedValue.set(Optional.ofNullable(initialValue()));
 }
 }
 }
 return mCachedValue.get().get();
 }
 
 protected abstract T initialValue();
 
 } LazyGetter.java

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public class LazyProvider extends ContentProvider {
 
 private static final int MODEL = 101;
 private static final int MODEL_ID = 102;
 
 private static final LazyGetter URI_MATCHER = new LazyGetter() {
 @Override
 protected UriMatcher initialValue() {
 final UriMatcher uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
 uriMatcher.addURI(LazyContract.AUTHORITY, "/model", MODEL);
 uriMatcher.addURI(LazyContract.AUTHORITY, "/model/#", MODEL_ID);
 // ...
 return uriMatcher;
 }
 }; 
 // ...
 } LazyProvider.java

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android:windowDisablePreview the (wrong) simple way…

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 AndroidManifest.xml

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 Default theme applies to all Activities AndroidManifest.xml android:theme="@style/Theme.LaunchTime">

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 <item name="android:colorPrimary">@color/colorPrimary</item>
 <item name="android:colorPrimaryDark">@color/colorPrimaryDark</item>
 <item name="android:colorAccent">@color/colorAccent</item>
 <item name="android:windowBackground">@color/appBackground</item>
 
 
 
 values/themes.xml

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No project on Earth is minSdk 21+ except Android built-in apps!

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to the rescue… AppCompat

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to the rescue… AppCompat (almost)

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to the rescue… AppCompat (almost)

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UI design is all about

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mirrors UI design is all about &mirrors mirrors & smoke

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Switch between compile time & runtime themes

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 values/attrs.xml

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 <item name=“android:actionBarSize"> @dimen/abc_action_bar_default_height_material </item>
 <item name="android:actionBarStyle">@style/PreviewWidget.ActionBar</item> <item name="android:windowBackground">@color/appBackground</item> <item name=“ltRuntimeTheme">@style/Theme.LaunchTime</item> 
 
 
 values/themes_preview.xml

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 <item name=“android:actionBarSize"> @dimen/abc_action_bar_default_height_material </item>
 <item name="android:actionBarStyle">@style/PreviewWidget.ActionBar</item> <item name="android:windowBackground">@color/appBackground</item> <item name=“ltRuntimeTheme">@style/Theme.LaunchTime</item> 
 
 
 values/themes_preview.xml @dimen/abc_action_bar_default_height_material Force pre-Lollipop ActionBars height to 48 / 56 / 64dp

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 <item name=“android:actionBarSize"> @dimen/abc_action_bar_default_height_material </item>
 <item name="android:actionBarStyle">@style/PreviewWidget.ActionBar</item> <item name="android:windowBackground">@color/appBackground</item> <item name=“ltRuntimeTheme">@style/Theme.LaunchTime</item> 
 
 
 values/themes_preview.xml @style/Theme.LaunchTime Define the theme to use at runtime

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 <item name="android:background">@color/colorPrimary</item>
 <item name=“android:displayOptions">showTitle</item> 
 
 
 values/styles_preview.xml

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 <item name="android:colorPrimary">@color/colorPrimary</item>
 <item name="android:colorPrimaryDark">@color/colorPrimaryDark</item>
 <item name="android:colorAccent">@color/colorAccent</item>
 <item name="android:windowBackground">@color/appBackground</item>
 <item name=“ltRuntimeTheme">@style/Theme.LaunchTime</item> 
 
 
 values-v21/themes_preview.xml

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 <item name="android:colorPrimary">@color/colorPrimary</item>
 <item name="android:colorPrimaryDark">@color/colorPrimaryDark</item>
 <item name="android:colorAccent">@color/colorAccent</item>
 <item name="android:windowBackground">@color/appBackground</item>
 <item name=“ltRuntimeTheme">@style/Theme.LaunchTime</item> 
 
 
 values-v21/themes_preview.xml parent=“android:Theme.Material.Light.DarkActionBar" Use Theme.Material on v-21+ devices

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 <item name="android:colorPrimary">@color/colorPrimary</item>
 <item name="android:colorPrimaryDark">@color/colorPrimaryDark</item>
 <item name="android:colorAccent">@color/colorAccent</item>
 <item name="android:windowBackground">@color/appBackground</item>
 <item name=“ltRuntimeTheme">@style/Theme.LaunchTime</item> 
 
 
 values-v21/themes_preview.xml Define the theme to use at runtime @style/Theme.LaunchTime

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 AndroidManifest.xml

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 AndroidManifest.xml android:theme="@style/PreviewTheme.LaunchTime" Tell the system to use a temporary preview theme

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public final class ThemeUtils { private ThemeUtils() { // No instances } @UiThread public static void ensureRuntimeTheme(Context context) { final TypedValue tv = new TypedValue(); context.getTheme().resolveAttribute(R.attr.ltRuntimeTheme, tv, true); if (tv.resourceId <= 0) { throw new IllegalArgumentException("ltRuntimeTheme " + "not defined in the preview theme"); } context.setTheme(tv.resourceId); } } ThemeUtils.java

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public class LaunchScreenActivity extends AppCompatActivity {
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 ThemeUtils.ensureRuntimeTheme(this);
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_launch_screen);
 // ...
 }
 
 } LaunchScreenActivity.java

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public class LaunchScreenActivity extends AppCompatActivity {
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 ThemeUtils.ensureRuntimeTheme(this);
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_launch_screen);
 // ...
 }
 
 } LaunchScreenActivity.java Inherit AppCompatActivity to get AppCompat behaviour public class LaunchScreenActivity extends AppCompatActivity {

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public class LaunchScreenActivity extends AppCompatActivity {
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 ThemeUtils.ensureRuntimeTheme(this);
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_launch_screen);
 // ...
 }
 
 } LaunchScreenActivity.java ThemeUtils.ensureRuntimeTheme(this); Dynamically switch to the runtime theme

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Don’t forget every screen is an entry point

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Consider launch screen as boring screen

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Don’t try to outsmart Android Embrace it!

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That’s all Folks! @cyrilmottier • cyrilmottier.com