Android Assignment 04

Introduction to Database with Room

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

Reuse your assignment3 code and copy it to assignment4 folder.
In your app gradle, increase compileSdk to 31 (should be 30 since Room dependency gives us errors with compileSdk 30)
Remove your MovieDb class from Assignment3.
Implement Room library to permanently save selected movies in database accross app starts-
Verify that selected movies are shown on app start in MainActivity / Fragment / RecyclerView

2 Movie 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

3 Espresso Test

package de.hdmstuttgart.movietracker;


import android.view.View;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import androidx.test.core.app.ActivityScenario;
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.action.ViewActions.closeSoftKeyboard;
import static androidx.test.espresso.action.ViewActions.replaceText;
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 Assignment4Test {

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

    @Test
    public void assignment4Test() {

        onView(withId(R.id.searchBtn))
                .perform(click());

        onView(withId(R.id.searchMovieTitleEditText))
                .perform(replaceText("Gold"), closeSoftKeyboard());

        onView(withId(R.id.searchMovieTitleButton))
                .perform(click());

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

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

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

        onView(withId(R.id.searchBtn))
                .perform(click());

        onView(withId(R.id.searchMovieTitleEditText))
                .perform(replaceText("uss"), closeSoftKeyboard());

        onView(withId(R.id.searchMovieTitleButton))
                .perform(click());

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

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

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

        activityScenarioRule.getScenario().close();

        ActivityScenario.launch(MainActivity.class);

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

    }

    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);
            }
        };
    }
}

4 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'
    androidTestImplementation 'androidx.test:rules:1.4.0'

    implementation 'androidx.room:room-runtime:2.3.0'
    annotationProcessor 'androidx.room:room-compiler:2.3.0'
}