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@nisrulz #devfest17

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@nisrulz #devfest17

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@nisrulz #devfest17 ●

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@nisrulz #devfest17 ● ●

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// Project’s root build.gradle allprojects { repositories { jcenter() maven { url 'https://maven.google.com' } // or use google() } } @nisrulz #devfest17

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// Project’s root build.gradle allprojects { repositories { jcenter() maven { url 'https://maven.google.com' } // or use google() } } @nisrulz #devfest17

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// app’s build.gradle // For Lifecycles, LiveData, and ViewModel, add: implementation "android.arch.lifecycle:runtime:1.0.0" implementation "android.arch.lifecycle:extensions:1.0.0-beta2" annotationProcessor "android.arch.lifecycle:compiler:1.0.0-beta2" @nisrulz #devfest17

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@nisrulz #devfest17

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class MyLocationListener { public MyLocationListener(Context context, Callback callback) { // ... } void start() { // connect to system location service } void stop() { // disconnect from system location service } } @nisrulz #devfest17

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class MyLocationListener { public MyLocationListener(Context context, Callback callback) { // ... } void start() { // connect to system location service } void stop() { // disconnect from system location service } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { private MyLocationListener myLocationListener; public void onCreate(...) { myLocationListener = new MyLocationListener(this, (location) -> { // update UI }); } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { private MyLocationListener myLocationListener; public void onCreate(...) { myLocationListener = new MyLocationListener(this, (location) -> { // update UI }); } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { // .. public void onStart() { super.onStart(); myLocationListener.start(); } public void onStop() { super.onStop(); myLocationListener.stop(); } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { // .. public void onStart() { super.onStart(); myLocationListener.start(); } public void onStop() { super.onStop(); myLocationListener.stop(); } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { //... public void onStart() { super.onStart(); Util.checkUserStatus(result -> { // what if this callback is invoked AFTER activity is stopped? if (result) { myLocationListener.start(); } }); } // onStop() } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { //... public void onStart() { super.onStart(); Util.checkUserStatus(result -> { // what if this callback is invoked AFTER activity is stopped? if (result) { myLocationListener.start(); } }); } // onStop() } @nisrulz #devfest17

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@nisrulz #devfest17

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Lifecycle Owner Class with lifecycle i.e Activity & Fragments @nisrulz #devfest17

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Lifecycle Owner Class with lifecycle i.e Activity & Fragments Lifecycle Observer Class that observe lifecycle @nisrulz #devfest17

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public class MyLocationListener implements LifecycleObserver { public MyLocationListener(Context context, Lifecycle lifecycle, Callback callback) { // ... lifecycle.addObserver(this); } } @nisrulz #devfest17

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public class MyLocationListener implements LifecycleObserver { public MyLocationListener(Context context, Lifecycle lifecycle, Callback callback) { // ... lifecycle.addObserver(this); } } @nisrulz #devfest17

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public class MyLocationListener implements LifecycleObserver { // ... @OnLifecycleEvent(Lifecycle.Event.ON_START) public void start() { // connect to system location service } @OnLifecycleEvent(Lifecycle.Event.ON_STOP) public void stop() { // disconnect from system location service } } @nisrulz #devfest17

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public class MyLocationListener implements LifecycleObserver { // ... @OnLifecycleEvent(Lifecycle.Event.ON_START) public void start() { // connect to system location service } @OnLifecycleEvent(Lifecycle.Event.ON_STOP) public void stop() { // disconnect from system location service } } @nisrulz #devfest17

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public class MyLocationListener implements LifecycleObserver { // ... @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY) public void cleanup() { lifecycle.removeObserver(this); } } @nisrulz #devfest17

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public class MyLocationListener implements LifecycleObserver { // ... @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY) public void cleanup() { lifecycle.removeObserver(this); } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { private MyLocationListener myLocationListener; public void onCreate() { myLocationListener = new MyLocationListener(this, getLifecycle(), location -> { //update UI }); Util.checkUserStatus(result -> { //... }); } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { private MyLocationListener myLocationListener; public void onCreate() { myLocationListener = new MyLocationListener(this, getLifecycle(), location -> { //update UI }); Util.checkUserStatus(result -> { //... }); } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { private MyLocationListener myLocationListener; public void onCreate() { myLocationListener = new MyLocationListener(this, getLifecycle(), location -> { //update UI }); Util.checkUserStatus(result -> { //... }); } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { private MyLocationListener myLocationListener; public void onCreate() { myLocationListener = new MyLocationListener(this, getLifecycle(), location -> { //update UI }); Util.checkUserStatus(result -> { //... }); } } @nisrulz #devfest17

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As of release of Support Library v26.1.0 @nisrulz #devfest17

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As of release of Support Library v26.1.0 “Fragment and FragmentActivity (the base class for AppCompatActivity) now implement the LifecycleOwner interface from Architecture Components” @nisrulz #devfest17

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class LocationManager extends LiveData{ // ... } @nisrulz #devfest17

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class LocationManager extends LiveData{ @override protected void onActive(){ super.onActive(); // connect to location } @override protected void onInactive(){ super.onInactive(); // disconnect from location } } @nisrulz #devfest17

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class LocationManager extends LiveData{ @override protected void onActive(){ super.onActive(); // connect to location } @override protected void onInactive(){ super.onInactive(); // disconnect from location } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { public void onCreate(...) { LocationManager.getInstance().observe(this, location -> { //Location Changed }) } } @nisrulz #devfest17

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class MyActivity extends AppCompatActivity { public void onCreate(...) { LocationManager.getInstance().observe(this, location -> { //Location Changed }) } } @nisrulz #devfest17

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@nisrulz #devfest17 It is the VM in MVVM architecture

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@nisrulz #devfest17 It is the VM in MVVM architecture A simple class to store and manage ui-related data

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@nisrulz #devfest17 It is the VM in MVVM architecture A simple class to store and manage ui-related data Data survives configuration changes such as screen rotation

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@nisrulz #devfest17 It is the VM in MVVM architecture A simple class to store and manage ui-related data Data survives configuration changes such as screen rotation No memory leaks (no references to activity or fragment or views)

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@nisrulz #devfest17 public class MyViewModel extends ViewModel { private MutableLiveData> users; public LiveData> getUsers() { if (users == null) { users = new MutableLiveData>(); loadUsers(); } return users; } private void loadUsers() { // do async operation to fetch users } }

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@nisrulz #devfest17 public class MyViewModel extends ViewModel { private MutableLiveData> users; public LiveData> getUsers() { if (users == null) { users = new MutableLiveData>(); loadUsers(); } return users; } private void loadUsers() { // do async operation to fetch users } }

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@nisrulz #devfest17 public class MyActivity extends AppCompatActivity { public void onCreate(Bundle savedInstanceState) { MyViewModel model = ViewModelProviders .of(this) .get(MyViewModel.class); model.getUsers().observe(this, users -> { // update UI }); } }

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@nisrulz #devfest17 public class MyActivity extends AppCompatActivity { public void onCreate(Bundle savedInstanceState) { MyViewModel model = ViewModelProviders .of(this) .get(MyViewModel.class); model.getUsers().observe(this, users -> { // update UI }); } }

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@nisrulz #devfest17

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@nisrulz #devfest17 ViewModels - provide a convenient way to retain data across configuration changes - they are not persisted if the application is killed by the operating system.

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@nisrulz #devfest17 ViewModels - provide a convenient way to retain data across configuration changes - they are not persisted if the application is killed by the operating system. SavedInstanceState - stores data, usually ID - they are saved in system process memory, OS limits the amount

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// app’s build.gradle // For Room, add: implementation "android.arch.persistence.room:runtime:1.0.0-beta2" annotationProcessor "android.arch.persistence.room:compiler:1.0.0-beta2" @nisrulz #devfest17

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@nisrulz #devfest17 @Entity public class User { @PrimaryKey private int uid; @ColumnInfo(name = "first_name") private String firstName; @ColumnInfo(name = "last_name") private String lastName; // Getters and setters are ignored for brevity, // but they're required for Room to work. }

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@nisrulz #devfest17 @Entity public class User { @PrimaryKey private int uid; @ColumnInfo(name = "first_name") private String firstName; @ColumnInfo(name = "last_name") private String lastName; // Getters and setters are ignored for brevity, // but they're required for Room to work. }

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@nisrulz #devfest17 @Dao public interface UserDao { @Query("SELECT * FROM user") List getAll(); @Insert void insertAll(User... users); @Delete void delete(User user); }

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@nisrulz #devfest17 @Dao public interface UserDao { @Query("SELECT * FROM user") List getAll(); @Insert void insertAll(User... users); @Delete void delete(User user); }

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@nisrulz #devfest17 @Dao public interface UserDao { @Query("SELECT * FROM user") List getAll(); @Insert void insertAll(User... users); @Delete void delete(User user); }

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@nisrulz #devfest17 @Dao public interface UserDao { @Query("SELECT * FROM user") List getAll(); @Insert void insertAll(User... users); @Delete void delete(User user); }

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@nisrulz #devfest17 @Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract UserDao userDao(); }

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@nisrulz #devfest17 @Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract UserDao userDao(); }

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@nisrulz #devfest17 @Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract UserDao userDao(); }

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@nisrulz #devfest17 @Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { public abstract UserDao userDao(); }

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@nisrulz #devfest17 @Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { // .. private static AppDatabase INSTANCE; public static AppDatabase getDatabase(Context context) { if (INSTANCE == null) { INSTANCE= Room .databaseBuilder(getApplicationContext(), AppDatabase.class, "db_name") .build(); } return INSTANCE; } }

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@nisrulz #devfest17 @Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase { // .. private static AppDatabase INSTANCE; public static AppDatabase getDatabase(Context context) { if (INSTANCE == null) { INSTANCE= Room .databaseBuilder(getApplicationContext(), AppDatabase.class, "db_name") .build(); } return INSTANCE; } }

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@nisrulz #devfest17 // .. INSTANCE= Room .databaseBuilder(getApplicationContext(), AppDatabase.class, "db_name") .build();

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@nisrulz #devfest17 // Get db AppDatabase appDatabase = AppDatabase .getDatabase(application); // Get data from db using the DAO List userList = appDatabase .userDao() .getAll();

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@nisrulz #devfest17

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@nisrulz #devfest17 Compile time SQL statement verification

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@nisrulz #devfest17 Compile time SQL statement verification Testable

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@nisrulz #devfest17 Compile time SQL statement verification Testable Support for RxJava 2

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@nisrulz #devfest17 Compile time SQL statement verification Testable Support for RxJava 2 SQLite data relationship supported

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@nisrulz #devfest17 Compile time SQL statement verification Testable Support for RxJava 2 SQLite data relationship supported Easily define multiple indexes to improve query performance

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@nisrulz #devfest17 @Dao public interface UserDao { @Query("SELECT * FROM user") List getAll(); @Insert void insertAll(User... users); @Delete void delete(User user); }

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@nisrulz #devfest17 @Dao public interface UserDao { @Query("SELECT * FROM user") LiveData> getAll(); @Insert void insertAll(User... users); @Delete void delete(User user); }

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@nisrulz #devfest17 @Dao public interface UserDao { @Query("SELECT * FROM user") LiveData> getAll(); @Insert void insertAll(User... users); @Delete void delete(User user); }

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@nisrulz #devfest17 Data takes time to load

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@nisrulz #devfest17 Data takes time to load Performance lag

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@nisrulz #devfest17 Data takes time to load Performance lag Too much memory wasted

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@nisrulz #devfest17 Gradually load information as needed from a data source, without overloading the device or waiting too long for a big database query.

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// app’s build.gradle // For Paging, add: implementation "android.arch.paging:runtime:1.0.0-alpha3" @nisrulz #devfest17

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@nisrulz #devfest17 // If you use Room lib to manage your data @Query("select * from users WHERE age > :age order by name DESC, id ASC") TiledDataSource usersOlderThan(int age);

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@nisrulz #devfest17 Loads data from a DataSource. You can configure how much data - is loaded at a time - should be prefetched (minimizing the amount of time your users have to wait for data to be loaded)

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@nisrulz #devfest17 Implementation of RecyclerView.Adapter that presents data from a PagedLi

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