Android Assignment 02

Introduction to RecyclerView

Stuttgart Media University

Please conduct the following tasks alone. For implementation details you can refer to the lecture slides or the Android developer website. Please do not hesitate to ask me or the tutor if you have any questions.

1 Tasks

Create a new Android Project in Android Studio and use your "assignment2" git folder as the project root folder.
- Template: "Empty Activity"
- Name: "MovieTracker"
- Package name: "de.hdmstuttgart.movietracker"
- Save location: Path to your assignment2 folder
- Language: Java
- Minimum SDK: API 26
Add RecyclerView Gradle dependency to your project implementation "androidx.recyclerview:recyclerview:1.2.1" https://developer.android.com/jetpack/androidx/releases/recyclerview
Add a vertical RecyclerView to your MainActivity and give it the following id: "android:id="@+id/homeRecyclerView""
Create item views as described
When user clicks on a row, remove the row
optional: run espresso test to validate your implementation

2 Item Views

Use this android ids for each row:

title: @+id/title
year: @+id/year
actor: @+id/actor

Example Layout:

center

3 Row Data

Use this data to fill out your rows:

title	year	actor
Dr. No	1962	Sean Connery
From Russia with Love	1963	Sean Connery
Goldfinger	1964	Sean Connery
Thunderball	1965	Sean Connery
You Only Live Twice	1967	Sean Connery

4 Espresso Test

package de.hdmstuttgart.movietracker;


import android.view.View;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import androidx.test.espresso.contrib.RecyclerViewActions;
import androidx.test.espresso.matcher.BoundedMatcher;
import androidx.test.ext.junit.rules.ActivityScenarioRule;
import androidx.test.filters.LargeTest;
import androidx.test.runner.AndroidJUnit4;

import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import static androidx.test.espresso.Espresso.onView;
import static androidx.test.espresso.action.ViewActions.click;
import static androidx.test.espresso.assertion.ViewAssertions.matches;
import static androidx.test.espresso.core.internal.deps.guava.base.Preconditions.checkNotNull;
import static androidx.test.espresso.matcher.ViewMatchers.hasDescendant;
import static androidx.test.espresso.matcher.ViewMatchers.withId;
import static androidx.test.espresso.matcher.ViewMatchers.withText;

@LargeTest
@RunWith(AndroidJUnit4.class)
public class Assignment2Test {

    @Rule
    public ActivityScenarioRule<MainActivity> activityScenarioRule
            = new ActivityScenarioRule<>(MainActivity.class);

    @Test
    public void mainActivityTest() {

        onView(withId(R.id.homeRecyclerView))
                .check(matches(atPosition(0, hasDescendant(withText("Dr. No")))));

        onView(withId(R.id.homeRecyclerView))
                .check(matches(atPosition(1, hasDescendant(withText("From Russia with Love")))));

        onView(withId(R.id.homeRecyclerView))
                .check(matches(atPosition(2, hasDescendant(withText("Goldfinger")))));

        onView(withId(R.id.homeRecyclerView))
                .check(matches(atPosition(3, hasDescendant(withText("Thunderball")))));

        onView(withId(R.id.homeRecyclerView))
                .check(matches(atPosition(4, hasDescendant(withText("You Only Live Twice")))));

        onView(withId(R.id.homeRecyclerView))
                .perform(RecyclerViewActions.actionOnItemAtPosition(0, click()));

        onView(withId(R.id.homeRecyclerView))
                .check(matches(atPosition(0, hasDescendant(withText("From Russia with Love")))));

        onView(withId(R.id.homeRecyclerView))
                .perform(RecyclerViewActions.actionOnItemAtPosition(0, click()));

        onView(withId(R.id.homeRecyclerView))
                .check(matches(atPosition(0, hasDescendant(withText("Goldfinger")))));
    }

    public static Matcher<View> atPosition(final int position, @NonNull final Matcher<View> itemMatcher) {
        checkNotNull(itemMatcher);
        return new BoundedMatcher<View, RecyclerView>(RecyclerView.class) {
            @Override
            public void describeTo(Description description) {
                description.appendText("has item at position " + position + ": ");
                itemMatcher.describeTo(description);
            }

            @Override
            protected boolean matchesSafely(final RecyclerView view) {
                RecyclerView.ViewHolder viewHolder = view.findViewHolderForAdapterPosition(position);
                if (viewHolder == null) {
                    // has no item on such position
                    return false;
                }
                return itemMatcher.matches(viewHolder.itemView);
            }
        };
    }
}

5 Gradle Dependencies

dependencies {
    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.1'
    implementation "androidx.recyclerview:recyclerview:1.2.1"
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
    androidTestImplementation 'androidx.test.espresso:espresso-contrib:3.4.0'
}