| /* |
| * Copyright 2018 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.viewmodel.savedstate.activity; |
| |
| import android.content.Intent; |
| import android.os.Bundle; |
| |
| import androidx.annotation.Nullable; |
| import androidx.fragment.app.Fragment; |
| import androidx.fragment.app.FragmentActivity; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| |
| public class FakingSavedStateActivity extends FragmentActivity { |
| |
| static final String FAKE_SAVED_STATE = "fake_state_key"; |
| private static final String TAG = "tag"; |
| private volatile CountDownLatch mCountDownLatch; |
| private Bundle mLastSavedState; |
| |
| public static Intent createIntent(Bundle savedState) { |
| return new Intent().putExtra(FAKE_SAVED_STATE, savedState); |
| } |
| |
| private Bundle getFakeSavedState() { |
| return getIntent() != null ? getIntent().getBundleExtra(FAKE_SAVED_STATE) : null; |
| } |
| |
| @Override |
| protected void onCreate(@Nullable Bundle savedInstanceState) { |
| Bundle alternativeState = savedInstanceState != null ? savedInstanceState |
| : getFakeSavedState(); |
| super.onCreate(alternativeState); |
| if (alternativeState == null) { |
| getSupportFragmentManager().beginTransaction().add(new Fragment(), TAG).commitNow(); |
| } |
| } |
| |
| public Fragment getFragment() { |
| return getSupportFragmentManager().findFragmentByTag(TAG); |
| } |
| |
| public Bundle awaitSavedState() throws InterruptedException { |
| mCountDownLatch = new CountDownLatch(1); |
| if (mCountDownLatch.await(1, TimeUnit.SECONDS)) { |
| Bundle result = mLastSavedState; |
| mLastSavedState = null; |
| mCountDownLatch = null; |
| return result; |
| } |
| return null; |
| } |
| |
| @Override |
| public void onSaveInstanceState(Bundle outState) { |
| super.onSaveInstanceState(outState); |
| if (mCountDownLatch != null) { |
| mLastSavedState = outState; |
| mCountDownLatch.countDown(); |
| } |
| } |
| } |