LifecycleEventObserver.java
/*
* 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;
import androidx.annotation.NonNull;
/**
* Class that can receive any lifecycle change and dispatch it to the receiver.
* <p>
* If a class implements both this interface and
* {@link androidx.lifecycle.DefaultLifecycleObserver}, then
* methods of {@code DefaultLifecycleObserver} will be called first, and then followed by the call
* of {@link LifecycleEventObserver#onStateChanged(LifecycleOwner, Lifecycle.Event)}
* <p>
* If a class implements this interface and in the same time uses {@link OnLifecycleEvent}, then
* annotations will be ignored.
*/
public interface LifecycleEventObserver extends LifecycleObserver {
/**
* Called when a state transition event happens.
*
* @param source The source of the event
* @param event The event
*/
void onStateChanged(@NonNull LifecycleOwner source, @NonNull Lifecycle.Event event);
}