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      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 import android.annotation.TestApi;
     23 
     24 /**
     25  * @hide
     26  */
     27 @SystemApi
     28 @TestApi
     29 public final class RemoteCallback implements Parcelable {
     30 
     31     public interface OnResultListener {
     32         public void onResult(Bundle result);
     33     }
     34 
     35     private final OnResultListener mListener;
     36     private final Handler mHandler;
     37     private final IRemoteCallback mCallback;
     38 
     39     public RemoteCallback(OnResultListener listener) {
     40         this(listener, null);
     41     }
     42 
     43     public RemoteCallback(@NonNull OnResultListener listener, @Nullable Handler handler) {
     44         if (listener == null) {
     45             throw new NullPointerException("listener cannot be null");
     46         }
     47         mListener = listener;
     48         mHandler = handler;
     49         mCallback = new IRemoteCallback.Stub() {
     50             @Override
     51             public void sendResult(Bundle data) {
     52                 RemoteCallback.this.sendResult(data);
     53             }
     54         };
     55     }
     56 
     57     RemoteCallback(Parcel parcel) {
     58         mListener = null;
     59         mHandler = null;
     60         mCallback = IRemoteCallback.Stub.asInterface(
     61                 parcel.readStrongBinder());
     62     }
     63 
     64     public void sendResult(@Nullable final Bundle result) {
     65         // Do local dispatch
     66         if (mListener != null) {
     67             if (mHandler != null) {
     68                 mHandler.post(new Runnable() {
     69                     @Override
     70                     public void run() {
     71                         mListener.onResult(result);
     72                     }
     73                 });
     74             } else {
     75                 mListener.onResult(result);
     76             }
     77         // Do remote dispatch
     78         } else {
     79             try {
     80                 mCallback.sendResult(result);
     81             } catch (RemoteException e) {
     82                 /* ignore */
     83             }
     84         }
     85     }
     86 
     87     @Override
     88     public int describeContents() {
     89         return 0;
     90     }
     91 
     92     @Override
     93     public void writeToParcel(Parcel parcel, int flags) {
     94         parcel.writeStrongBinder(mCallback.asBinder());
     95     }
     96 
     97     public static final Parcelable.Creator<RemoteCallback> CREATOR
     98             = new Parcelable.Creator<RemoteCallback>() {
     99         public RemoteCallback createFromParcel(Parcel parcel) {
    100             return new RemoteCallback(parcel);
    101         }
    102 
    103         public RemoteCallback[] newArray(int size) {
    104             return new RemoteCallback[size];
    105         }
    106     };
    107 }
    108