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/*
* Copyright (C) 2015 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 com.android.tv;
import android.support.annotation.MainThread;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.ArraySet;
import com.android.tv.data.api.Channel;
import java.util.Set;
/**
* A wrapper for safely getting the current {@link MainActivity}. Note that this class is not
* thread-safe. All the public methods should be called on main thread.
*/
@MainThread
public final class MainActivityWrapper {
private MainActivity mActivity;
private final Set<OnCurrentChannelChangeListener> mListeners = new ArraySet<>();
/**
* Returns the current main activity. <b>WARNING</b> do not keep a reference to MainActivity,
* leaking activities is expensive.
*/
MainActivity getMainActivity() {
return mActivity;
}
/** Checks if the given {@code activity} is the current main activity. */
boolean isCurrent(MainActivity activity) {
return activity != null && mActivity == activity;
}
/** Sets the currently created main activity instance. */
public void onMainActivityCreated(@NonNull MainActivity activity) {
mActivity = activity;
}
/** Unsets the main activity instance. */
public void onMainActivityDestroyed(@NonNull MainActivity activity) {
if (mActivity == activity) {
mActivity = null;
}
}
/** Notifies the current channel change. */
void notifyCurrentChannelChange(@NonNull MainActivity caller, @Nullable Channel channel) {
if (mActivity == caller) {
for (OnCurrentChannelChangeListener listener : mListeners) {
listener.onCurrentChannelChange(channel);
}
}
}
/** Checks if the main activity is created. */
public boolean isCreated() {
return mActivity != null;
}
/** Checks if the main activity is started. */
public boolean isStarted() {
return mActivity != null && mActivity.isActivityStarted();
}
/** Checks if the main activity is resumed. */
public boolean isResumed() {
return mActivity != null && mActivity.isActivityResumed();
}
/** Adds OnCurrentChannelChangeListener. */
public void addOnCurrentChannelChangeListener(OnCurrentChannelChangeListener listener) {
mListeners.add(listener);
}
/** Removes OnCurrentChannelChangeListener. */
public void removeOnCurrentChannelChangeListener(OnCurrentChannelChangeListener listener) {
mListeners.remove(listener);
}
/** Listener for the current channel change in main activity. */
public interface OnCurrentChannelChangeListener {
/** Called when the current channel changes. */
void onCurrentChannelChange(@Nullable Channel channel);
}
}
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