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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.lifecycle;
import static androidx.lifecycle.Lifecycle.Event.ON_CREATE;
import static androidx.lifecycle.Lifecycle.Event.ON_DESTROY;
import static androidx.lifecycle.Lifecycle.Event.ON_PAUSE;
import static androidx.lifecycle.Lifecycle.Event.ON_RESUME;
import static androidx.lifecycle.Lifecycle.Event.ON_START;
import static androidx.lifecycle.Lifecycle.Event.ON_STOP;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static java.util.Arrays.asList;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.activity.EmptyActivity;
import androidx.lifecycle.extensions.test.R;
import androidx.test.annotation.UiThreadTest;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.filters.SmallTest;
import androidx.test.rule.ActivityTestRule;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import java.util.ArrayList;
import java.util.List;
@SmallTest
@RunWith(AndroidJUnit4.class)
public class FragmentOperationsLifecycleTest {
@Rule
public ActivityTestRule<EmptyActivity> mActivityTestRule = new ActivityTestRule<>(
EmptyActivity.class);
@Test
@UiThreadTest
public void addRemoveFragment() {
EmptyActivity activity = mActivityTestRule.getActivity();
Fragment fragment = new Fragment();
FragmentManager fm = activity.getSupportFragmentManager();
fm.beginTransaction().add(fragment, "tag").commitNow();
CollectingObserver observer = observeAndCollectIn(fragment);
assertThat(observer.getEventsAndReset(), is(asList(ON_CREATE, ON_START, ON_RESUME)));
fm.beginTransaction().remove(fragment).commitNow();
assertThat(observer.getEventsAndReset(), is(asList(ON_PAUSE, ON_STOP, ON_DESTROY)));
fm.beginTransaction().add(fragment, "tag").commitNow();
assertThat(observer.getEventsAndReset(), is(asList(ON_CREATE, ON_START, ON_RESUME)));
}
@Test
@UiThreadTest
public void fragmentInBackstack() {
EmptyActivity activity = mActivityTestRule.getActivity();
Fragment fragment1 = new Fragment();
FragmentManager fm = activity.getSupportFragmentManager();
fm.beginTransaction().add(R.id.fragment_container, fragment1, "tag").addToBackStack(null)
.commit();
fm.executePendingTransactions();
CollectingObserver observer1 = observeAndCollectIn(fragment1);
assertThat(observer1.getEventsAndReset(), is(asList(ON_CREATE, ON_START, ON_RESUME)));
Fragment fragment2 = new Fragment();
fm.beginTransaction().replace(R.id.fragment_container, fragment2).addToBackStack(null)
.commit();
fm.executePendingTransactions();
CollectingObserver observer2 = observeAndCollectIn(fragment2);
assertThat(observer1.getEventsAndReset(), is(asList(ON_PAUSE, ON_STOP)));
assertThat(observer2.getEventsAndReset(), is(asList(ON_CREATE, ON_START, ON_RESUME)));
assertThat(fm.popBackStackImmediate(), is(true));
assertThat(observer1.getEventsAndReset(), is(asList(ON_START, ON_RESUME)));
assertThat(observer2.getEventsAndReset(), is(asList(ON_PAUSE, ON_STOP, ON_DESTROY)));
assertThat(fm.popBackStackImmediate(), is(true));
assertThat(observer1.getEventsAndReset(), is(asList(ON_PAUSE, ON_STOP, ON_DESTROY)));
}
private static CollectingObserver observeAndCollectIn(Fragment fragment) {
CollectingObserver observer = new CollectingObserver();
fragment.getLifecycle().addObserver(observer);
return observer;
}
private static class CollectingObserver implements LifecycleEventObserver {
final List<Lifecycle.Event> mCollectedEvents = new ArrayList<>();
@Override
public void onStateChanged(@NonNull LifecycleOwner source, @NonNull Lifecycle.Event event) {
mCollectedEvents.add(event);
}
List<Lifecycle.Event> getEventsAndReset() {
ArrayList<Lifecycle.Event> events = new ArrayList<>(mCollectedEvents);
mCollectedEvents.clear();
return events;
}
}
}
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