1/*
2 * Copyright 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package androidx.car.widget;
18
19import static android.support.test.espresso.Espresso.onView;
20import static android.support.test.espresso.action.ViewActions.click;
21import static android.support.test.espresso.matcher.ViewMatchers.isDescendantOfA;
22import static android.support.test.espresso.matcher.ViewMatchers.withId;
23
24import static org.hamcrest.Matchers.allOf;
25import static org.junit.Assert.assertEquals;
26
27import android.content.pm.ActivityInfo;
28import android.content.pm.PackageManager;
29import android.support.test.espresso.IdlingRegistry;
30import android.support.test.espresso.IdlingResource;
31import android.support.test.filters.SmallTest;
32import android.support.test.filters.Suppress;
33import android.support.test.rule.ActivityTestRule;
34import android.support.test.runner.AndroidJUnit4;
35import androidx.recyclerview.widget.LinearLayoutManager;
36import androidx.recyclerview.widget.RecyclerView;
37import android.view.LayoutInflater;
38import android.view.View;
39import android.view.ViewGroup;
40import android.widget.TextView;
41
42import org.hamcrest.Matcher;
43import org.junit.After;
44import org.junit.Assume;
45import org.junit.Before;
46import org.junit.Rule;
47import org.junit.Test;
48import org.junit.runner.RunWith;
49
50import java.util.ArrayList;
51import java.util.List;
52import java.util.Random;
53
54import androidx.car.test.R;
55
56/** Unit tests for the ability of the {@link PagedListView} to save state. */
57@RunWith(AndroidJUnit4.class)
58@SmallTest
59public final class PagedListViewSavedStateTest {
60    /**
61     * Used by {@link TestAdapter} to calculate ViewHolder height so N items appear in one page of
62     * {@link PagedListView}. If you need to test behavior under multiple pages, set number of items
63     * to ITEMS_PER_PAGE * desired_pages.
64     *
65     * <p>Actual value does not matter.
66     */
67    private static final int ITEMS_PER_PAGE = 5;
68
69    /**
70     * The total number of items to display in a list. This value just needs to be large enough
71     * to ensure the scroll bar shows.
72     */
73    private static final int TOTAL_ITEMS_IN_LIST = 100;
74
75    private static final int NUM_OF_PAGES = TOTAL_ITEMS_IN_LIST / ITEMS_PER_PAGE;
76
77    @Rule
78    public ActivityTestRule<PagedListViewSavedStateActivity> mActivityRule =
79            new ActivityTestRule<>(PagedListViewSavedStateActivity.class);
80
81    private PagedListViewSavedStateActivity mActivity;
82    private PagedListView mPagedListView1;
83    private PagedListView mPagedListView2;
84
85    @Before
86    public void setUp() {
87        Assume.assumeTrue(isAutoDevice());
88
89        mActivity = mActivityRule.getActivity();
90        mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
91
92        mPagedListView1 = mActivity.findViewById(R.id.paged_list_view_1);
93        mPagedListView2 = mActivity.findViewById(R.id.paged_list_view_2);
94
95        setUpPagedListView(mPagedListView1);
96        setUpPagedListView(mPagedListView2);
97    }
98
99    private boolean isAutoDevice() {
100        PackageManager packageManager = mActivityRule.getActivity().getPackageManager();
101        return packageManager.hasSystemFeature(PackageManager.FEATURE_AUTOMOTIVE);
102    }
103
104    private void setUpPagedListView(PagedListView pagedListView) {
105        try {
106            mActivityRule.runOnUiThread(() -> {
107                pagedListView.setMaxPages(PagedListView.ItemCap.UNLIMITED);
108                pagedListView.setAdapter(new TestAdapter(TOTAL_ITEMS_IN_LIST,
109                        pagedListView.getMeasuredHeight()));
110            });
111        } catch (Throwable throwable) {
112            throwable.printStackTrace();
113            throw new RuntimeException(throwable);
114        }
115    }
116
117    @After
118    public void tearDown() {
119        for (IdlingResource idlingResource : IdlingRegistry.getInstance().getResources()) {
120            IdlingRegistry.getInstance().unregister(idlingResource);
121        }
122    }
123
124    @Suppress
125    @Test
126    public void testPagePositionRememberedOnRotation() {
127        LinearLayoutManager layoutManager1 =
128                (LinearLayoutManager) mPagedListView1.getRecyclerView().getLayoutManager();
129        LinearLayoutManager layoutManager2 =
130                (LinearLayoutManager) mPagedListView2.getRecyclerView().getLayoutManager();
131
132        Random random = new Random();
133        IdlingRegistry.getInstance().register(new PagedListViewScrollingIdlingResource(
134                mPagedListView1, mPagedListView2));
135
136        // Add 1 to this random number to ensure it is a value between 1 and NUM_OF_PAGES.
137        int numOfClicks = 2;
138        clickPageDownButton(onPagedListView1(), numOfClicks);
139        int topPositionOfPagedListView1 =
140                layoutManager1.findFirstVisibleItemPosition();
141
142        numOfClicks = 3;
143        clickPageDownButton(onPagedListView2(), numOfClicks);
144        int topPositionOfPagedListView2 =
145                layoutManager2.findFirstVisibleItemPosition();
146
147        // Perform a configuration change by rotating the screen.
148        mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
149        mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
150
151        // Check that the positions are the same after the change.
152        assertEquals(topPositionOfPagedListView1,
153                layoutManager1.findFirstVisibleItemPosition());
154        assertEquals(topPositionOfPagedListView2,
155                layoutManager2.findFirstVisibleItemPosition());
156    }
157
158    /** Clicks the page down button on the given PagedListView for the given number of times. */
159    private void clickPageDownButton(Matcher<View> pagedListView, int times) {
160        for (int i = 0; i < times; i++) {
161            onView(allOf(withId(R.id.page_down), pagedListView)).perform(click());
162        }
163    }
164
165
166    /** Convenience method for checking that a View is on the first PagedListView. */
167    private Matcher<View> onPagedListView1() {
168        return isDescendantOfA(withId(R.id.paged_list_view_1));
169    }
170
171    /** Convenience method for checking that a View is on the second PagedListView. */
172    private Matcher<View> onPagedListView2() {
173        return isDescendantOfA(withId(R.id.paged_list_view_2));
174    }
175
176    private static String getItemText(int index) {
177        return "Data " + index;
178    }
179
180    /** An Adapter that ensures that there is {@link #ITEMS_PER_PAGE} displayed. */
181    private class TestAdapter extends RecyclerView.Adapter<TestViewHolder>
182            implements PagedListView.ItemCap {
183        private List<String> mData;
184        private int mParentHeight;
185
186        TestAdapter(int itemCount, int parentHeight) {
187            mData = new ArrayList<>();
188            for (int i = 0; i < itemCount; i++) {
189                mData.add(getItemText(i));
190            }
191            mParentHeight = parentHeight;
192        }
193
194        @Override
195        public TestViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
196            LayoutInflater inflater = LayoutInflater.from(parent.getContext());
197            return new TestViewHolder(inflater, parent);
198        }
199
200        @Override
201        public void onBindViewHolder(TestViewHolder holder, int position) {
202            // Calculate height for an item so one page fits ITEMS_PER_PAGE items.
203            int height = (int) Math.floor(mParentHeight / ITEMS_PER_PAGE);
204            holder.itemView.setMinimumHeight(height);
205            holder.setText(mData.get(position));
206        }
207
208        @Override
209        public int getItemCount() {
210            return mData.size();
211        }
212
213        @Override
214        public void setMaxItems(int maxItems) {
215            // No-op
216        }
217    }
218
219    /** A ViewHolder that holds a View with a TextView. */
220    private class TestViewHolder extends RecyclerView.ViewHolder {
221        private TextView mTextView;
222
223        TestViewHolder(LayoutInflater inflater, ViewGroup parent) {
224            super(inflater.inflate(R.layout.paged_list_item_column_card, parent, false));
225            mTextView = itemView.findViewById(R.id.text_view);
226        }
227
228        public void setText(String text) {
229            mTextView.setText(text);
230        }
231    }
232
233    // Registering IdlingResource in @Before method does not work - espresso doesn't actually wait
234    // for ViewAction to finish. So each method that  clicks on button will need to register their
235    // own IdlingResource.
236    private class PagedListViewScrollingIdlingResource implements IdlingResource {
237        private boolean mIsIdle = true;
238        private ResourceCallback mResourceCallback;
239
240        PagedListViewScrollingIdlingResource(PagedListView pagedListView1,
241                PagedListView pagedListView2) {
242            // Ensure the IdlingResource waits for both RecyclerViews to finish their movement.
243            pagedListView1.getRecyclerView().addOnScrollListener(mOnScrollListener);
244            pagedListView2.getRecyclerView().addOnScrollListener(mOnScrollListener);
245        }
246
247        @Override
248        public String getName() {
249            return PagedListViewScrollingIdlingResource.class.getName();
250        }
251
252        @Override
253        public boolean isIdleNow() {
254            return mIsIdle;
255        }
256
257        @Override
258        public void registerIdleTransitionCallback(ResourceCallback callback) {
259            mResourceCallback = callback;
260        }
261
262        private final RecyclerView.OnScrollListener mOnScrollListener =
263                new RecyclerView.OnScrollListener() {
264                    @Override
265                    public void onScrollStateChanged(
266                            RecyclerView recyclerView, int newState) {
267                        super.onScrollStateChanged(recyclerView, newState);
268
269                        // Treat dragging as idle, or Espresso will block itself when
270                        // swiping.
271                        mIsIdle = (newState == RecyclerView.SCROLL_STATE_IDLE
272                                || newState == RecyclerView.SCROLL_STATE_DRAGGING);
273
274                        if (mIsIdle && mResourceCallback != null) {
275                            mResourceCallback.onTransitionToIdle();
276                        }
277                    }
278
279                    @Override
280                    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {}
281                };
282    }
283}
284