evandroferreiras

interface PlacesService {
    @GET("places/{id}")
    Observable<Place> getPlaceById(@Path("id") int placeId);
}

interface UsersService {
    @GET("users")
    Observable<List<User>> listUsers();
}

evandroferreiras

interface PlacesService {
    @GET("places/{id}")
    Call<Place> getPlaceById(@Path("id") int placeId);
}

interface UsersService {
    @GET("users")
    Call<List<User>> listUsers();
}

evandroferreiras

Observable<Car> carsObservable = getBestSellingCarsObservable();
carsObservable.subscribeOn(Schedulers.io())
.filter(car -> car.type == Car.Type.ALL_ELECTRIC)
.filter(car -> car.price < 90000)
.map(car -> car.year + " " + car.make + " " + car.model)
.distinct()
.take(5)
.observeOn(AndroidSchedulers.mainThread())
.subscribe(this::updateUi);

evandroferreiras

getPerson(person => {
   getPlanet(person, (planet) => {
       getGalaxy(planet, (galaxy) => {
           console.log(galaxy);
       });
   });
});

evandroferreiras

package com.example.pkg.myimageview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;

import com.example.pkg.myimageviewlibrary.MyImageViewBasic;

public class MainActivity extends AppCompatActivity {

evandroferreiras

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.example.pkg.myimageviewlibrary.MyImageViewBasic
        android:id="@+id/blackAndWhiteImage"                                                         

evandroferreiras

package com.example.pkg.myimageviewlibrary;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;
import android.widget.RelativeLayout;

evandroferreiras

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="MyImageViewBasic">
        <attr name="imageSrc" format="reference"/>
        <attr name="imagePlaceholder" format="reference"/>
        <attr name="imageError" format="reference"/>
        <attr name="isBlackAndWhite" format="boolean"/>
    </declare-styleable>
</resources>

evandroferreiras

package com.example.pkg.myimageviewlibrary;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

public class MyImageViewBasic extends RelativeLayout {
    public MyImageViewBasic(Context context) {
        super(context);
    }

evandroferreiras

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

    <ImageView
        android:id="@+id/my_image_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />