RemoteCallback.java revision 9c165d76010d9f79f5cd71978742a335b6b8d1b4 
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
17package android.os;
18
19import android.annotation.NonNull;
20import android.annotation.Nullable;
21
22/**
23 * @hide
24 */
25public final class RemoteCallback implements Parcelable {
26
27    public interface OnResultListener {
28        public void onResult(Bundle result);
29    }
30
31    private final OnResultListener mListener;
32    private final Handler mHandler;
33    private final IRemoteCallback mCallback;
34
35    public RemoteCallback(OnResultListener listener) {
36        this(listener, null);
37    }
38
39    public RemoteCallback(@NonNull OnResultListener listener, @Nullable Handler handler) {
40        if (listener == null) {
41            throw new NullPointerException("listener cannot be null");
42        }
43        mListener = listener;
44        mHandler = handler;
45        mCallback = new IRemoteCallback.Stub() {
46            @Override
47            public void sendResult(Bundle data) {
48                RemoteCallback.this.sendResult(data);
49            }
50        };
51    }
52
53    RemoteCallback(Parcel parcel) {
54        mListener = null;
55        mHandler = null;
56        mCallback = IRemoteCallback.Stub.asInterface(
57                parcel.readStrongBinder());
58    }
59
60    public void sendResult(@Nullable final Bundle result) {
61        // Do local dispatch
62        if (mListener != null) {
63            if (mHandler != null) {
64                mHandler.post(new Runnable() {
65                    @Override
66                    public void run() {
67                        mListener.onResult(result);
68                    }
69                });
70            } else {
71                mListener.onResult(result);
72            }
73        // Do remote dispatch
74        } else {
75            try {
76                mCallback.sendResult(result);
77            } catch (RemoteException e) {
78                /* ignore */
79            }
80        }
81    }
82
83    @Override
84    public int describeContents() {
85        return 0;
86    }
87
88    @Override
89    public void writeToParcel(Parcel parcel, int flags) {
90        parcel.writeStrongBinder(mCallback.asBinder());
91    }
92
93    public static final Parcelable.Creator<RemoteCallback> CREATOR
94            = new Parcelable.Creator<RemoteCallback>() {
95        public RemoteCallback createFromParcel(Parcel parcel) {
96            return new RemoteCallback(parcel);
97        }
98
99        public RemoteCallback[] newArray(int size) {
100            return new RemoteCallback[size];
101        }
102    };
103}
104