robertlevonyan

ValueAnimator sizeAnimator = ValueAnimator.ofFloat(1f, 1.2f);
sizeAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
  @Override
  public void onAnimationUpdate(ValueAnimator valueAnimator) {
    float animatedValue = (float) valueAnimator.getAnimatedValue();

    //something really cool happens here
  }
});

robertlevonyan

// A helper class to work with SQLite database
public class DatabaseHelper extends SQLiteOpenHelper {
    // Database version, which should be upgraded each time we made changes in database structure
    private static final int DATABASE_VERSION = 1;

    // Database name
    private static final String DATABASE_NAME = "notes_db";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);

robertlevonyan

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
  
    <!-- Other components and views -->
  
    <android.support.design.bottomappbar.BottomAppBar
        android:id="@+id/bottomAppBar"
        android:layout_width="match_parent"

robertlevonyan

override fun onCreate(savedInstanceState: Bundle?) {
  // some smart stuff here
  
  bottomAppBar.replaceMenu(R.menu.menu_wallpaper)
  bottomAppBar.setNavigationOnClickListener {
    // do something interesting on navigation click
  }
  
}

robertlevonyan

class LocationWorker(context: Context, workerParams: WorkerParameters) 
    : Worker(context, workerParams) {
    
    ...
    
    override fun doWork(): Result {
        
        val latitude = inputData.getDouble(KEY_LATITUDE, 40.1903484)
        val longitude = inputData.getDouble(KEY_LONGITUDE, 44.5148367)
        

robertlevonyan

fun createConstraints() = Constraints.Builder()
                        .setRequiredNetworkType(NetworkType.UNMETERED)  // if connected to WIFI
                                                                          // other values(NOT_REQUIRED, CONNECTED, NOT_ROAMING, METERED)
                        .setRequiresBatteryNotLow(true)                 // if the battery is not low
                        .setRequiresStorageNotLow(true)                 // if the storage is not low
                        .build()

fun createWorkRequest(data: Data) = PeriodicWorkRequestBuilder<LocationWorker>(12, TimeUnit.HOURS)  // setting period to 12 hours
                // set input data for the work
                .setInputData(data)                                                     

robertlevonyan

fun chainWorks(filter1: Work, filter2: Work, compress: Work, upload: Work) {
  WorkManager.getInstance()
    // Run these works in parallel
    .beginWith(listOf(filter1, filter2))
    // Dependent work (only runs after all previous work in chain)
    .then(compress)
    .then(upload)
    // Don't forget to enqueue()
    .enqueue()
}

robertlevonyan

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment
        android:id="@+id/fragmentNavHost"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"

robertlevonyan

...

//check is there a signed in user and navigate to specific destination

if (usersRepositoty.userExists())
  Navigation.findNavController(view).navigate(R.id.action_splashFragment_to_messageListFragment)
} else {
  Navigation.findNavController(view).navigate(R.id.action_splashFragment_to_signInFragment)
}

robertlevonyan

...

//navigate to Sign Up screen to create a new user

buttonSignUp.setOnClickListener { view ->
  view.findNavController().navigate(R.id.action_signInFragment_to_signUpFragment)
}

...