Home | History | Annotate | Download | only in os 
      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 {
     30         public void onResult(Bundle result);
     31     }
     32 
     33     private final OnResultListener mListener;
     34     private final Handler mHandler;
     35     private final IRemoteCallback mCallback;
     36 
     37     public RemoteCallback(OnResultListener listener) {
     38         this(listener, null);
     39     }
     40 
     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 
     55     RemoteCallback(Parcel parcel) {
     56         mListener = null;
     57         mHandler = null;
     58         mCallback = IRemoteCallback.Stub.asInterface(
     59                 parcel.readStrongBinder());
     60     }
     61 
     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
     86     public int describeContents() {
     87         return 0;
     88     }
     89 
     90     @Override
     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