tobioyelekan

private val userId = MutableLiveData<String>()

    val userDetails = userId.switchMap {
        userRepo.getUser(it)
    }

    val userFullName = userDetails.map {
        getFullName(it.firstName, it.lastName)
    }

nikhilmufc7

// Error Codes for SignUp

ERROR_OPERATION_NOT_ALLOWED` - Indicates that Anonymous accounts are not enabled.
ERROR_WEAK_PASSWORD - If the password is not strong enough.
ERROR_INVALID_EMAIL` - If the email address is malformed.  
ERROR_EMAIL_ALREADY_IN_USE - If the email is already in use by a different account. 
ERROR_INVALID_CREDENTIAL` - If the [email] address is malformed.
  
  // sending password reset email
ERROR_INVALID_EMAIL` - If the [email] address is malformed.

anitaa1990

/* We create an interface with one method  */

  public interface TextWatcherWithInstance {
      void onTextChanged(EditText editText, CharSequence s, int start, int before, int count);
  }
  
  
  /* We create a custom class called MultiTextWatcher. 
   * And pass the interface here  
   */            

msangel

// Dagger 1 example
@Module(
        complete = false,
        library = true
)
public final class ApiModule {
    @Provides
    @Singleton
    Retrofit provideRetrofit(Gson gson, Application app) {
        return new Retrofit.Builder()

Antarix

import android.content.Context;
import android.content.Intent;
import android.support.v4.content.WakefulBroadcastReceiver;
import android.util.Log;

/**
 * This is called whenever app receives notification
 * in background/foreground state so you can
 * apply logic for background task, but still Firebase notification
 * will be shown in notification tray

iChintanSoni

import android.content.Context;
import android.content.SharedPreferences;

public class SharedPreferenceUtils {
    private static SharedPreferenceUtils mSharedPreferenceUtils;
    protected Context mContext;
    private SharedPreferences mSharedPreferences;
    private SharedPreferences.Editor mSharedPreferencesEditor;

    private SharedPreferenceUtils(Context context) {

lopspower

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

mcelotti

Nav flow is: A => B => C => A with results from C
If you're using fragments please note that "onActivityResult" will be called according to where "startActivityForResult" is called (method "startActivityForResult" is available in both, activity and fragment)

ActivityA
   startActivityForResult(intentB, 22);

ActivityB
   intentC.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
   startActivity(intentC);
   finish();

cesarferreira

View Click

Instead of the verbose setOnClickListener:

RxView.clicks(submitButton).subscribe(o -> log("submit button clicked!"));

Filter even numbers

Observable
    .just(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

yqritc

ItemOffsetDecoration

public class ItemOffsetDecoration extends RecyclerView.ItemDecoration {

    private int mItemOffset;

    public ItemOffsetDecoration(int itemOffset) {
        mItemOffset = itemOffset;
    }