1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package android.os;
18 
19 import android.annotation.NonNull;
20 import android.annotation.Nullable;
21 import android.annotation.SystemApi;
22 
23 /**
24  * @hide
25  */
26 @SystemApi
27 public final class RemoteCallback implements Parcelable {
28 
29     public interface OnResultListener {
onResult(Bundle result)30         public void onResult(Bundle result);
31     }
32 
33     private final OnResultListener mListener;
34     private final Handler mHandler;
35     private final IRemoteCallback mCallback;
36 
RemoteCallback(OnResultListener listener)37     public RemoteCallback(OnResultListener listener) {
38         this(listener, null);
39     }
40 
RemoteCallback(@onNull OnResultListener listener, @Nullable Handler handler)41     public RemoteCallback(@NonNull OnResultListener listener, @Nullable Handler handler) {
42         if (listener == null) {
43             throw new NullPointerException("listener cannot be null");
44         }
45         mListener = listener;
46         mHandler = handler;
47         mCallback = new IRemoteCallback.Stub() {
48             @Override
49             public void sendResult(Bundle data) {
50                 RemoteCallback.this.sendResult(data);
51             }
52         };
53     }
54 
RemoteCallback(Parcel parcel)55     RemoteCallback(Parcel parcel) {
56         mListener = null;
57         mHandler = null;
58         mCallback = IRemoteCallback.Stub.asInterface(
59                 parcel.readStrongBinder());
60     }
61 
sendResult(@ullable final Bundle result)62     public void sendResult(@Nullable final Bundle result) {
63         // Do local dispatch
64         if (mListener != null) {
65             if (mHandler != null) {
66                 mHandler.post(new Runnable() {
67                     @Override
68                     public void run() {
69                         mListener.onResult(result);
70                     }
71                 });
72             } else {
73                 mListener.onResult(result);
74             }
75         // Do remote dispatch
76         } else {
77             try {
78                 mCallback.sendResult(result);
79             } catch (RemoteException e) {
80                 /* ignore */
81             }
82         }
83     }
84 
85     @Override
describeContents()86     public int describeContents() {
87         return 0;
88     }
89 
90     @Override
writeToParcel(Parcel parcel, int flags)91     public void writeToParcel(Parcel parcel, int flags) {
92         parcel.writeStrongBinder(mCallback.asBinder());
93     }
94 
95     public static final Parcelable.Creator<RemoteCallback> CREATOR
96             = new Parcelable.Creator<RemoteCallback>() {
97         public RemoteCallback createFromParcel(Parcel parcel) {
98             return new RemoteCallback(parcel);
99         }
100 
101         public RemoteCallback[] newArray(int size) {
102             return new RemoteCallback[size];
103         }
104     };
105 }
106