blob: 5af5079f52264b998697ba57e35624dd5f84d303 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* 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.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);
}
}
|
