131 lines
4.1 KiB
Java
131 lines
4.1 KiB
Java
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.os;
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import com.android.internal.os.IResultReceiver;
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/**
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* Generic interface for receiving a callback result from someone. Use this
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* by creating a subclass and implement {@link #onReceiveResult}, which you can
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* then pass to others and send through IPC, and receive results they
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* supply with {@link #send}.
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*/
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public class ResultReceiver implements Parcelable {
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final boolean mLocal;
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final Handler mHandler;
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IResultReceiver mReceiver;
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class MyRunnable implements Runnable {
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final int mResultCode;
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final Bundle mResultData;
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MyRunnable(int resultCode, Bundle resultData) {
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mResultCode = resultCode;
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mResultData = resultData;
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}
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public void run() {
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onReceiveResult(mResultCode, mResultData);
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}
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}
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class MyResultReceiver extends IResultReceiver.Stub {
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public void send(int resultCode, Bundle resultData) {
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if (mHandler != null) {
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mHandler.post(new MyRunnable(resultCode, resultData));
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} else {
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onReceiveResult(resultCode, resultData);
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}
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}
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}
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/**
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* Create a new ResultReceive to receive results. Your
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* {@link #onReceiveResult} method will be called from the thread running
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* <var>handler</var> if given, or from an arbitrary thread if null.
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*/
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public ResultReceiver(Handler handler) {
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mLocal = true;
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mHandler = handler;
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}
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/**
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* Deliver a result to this receiver. Will call {@link #onReceiveResult},
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* always asynchronously if the receiver has supplied a Handler in which
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* to dispatch the result.
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* @param resultCode Arbitrary result code to deliver, as defined by you.
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* @param resultData Any additional data provided by you.
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*/
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public void send(int resultCode, Bundle resultData) {
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if (mLocal) {
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if (mHandler != null) {
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mHandler.post(new MyRunnable(resultCode, resultData));
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} else {
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onReceiveResult(resultCode, resultData);
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}
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return;
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}
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if (mReceiver != null) {
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try {
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mReceiver.send(resultCode, resultData);
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} catch (RemoteException e) {
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}
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}
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}
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/**
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* Override to receive results delivered to this object.
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*
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* @param resultCode Arbitrary result code delivered by the sender, as
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* defined by the sender.
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* @param resultData Any additional data provided by the sender.
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*/
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protected void onReceiveResult(int resultCode, Bundle resultData) {
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}
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public int describeContents() {
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return 0;
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}
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public void writeToParcel(Parcel out, int flags) {
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synchronized (this) {
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if (mReceiver == null) {
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mReceiver = new MyResultReceiver();
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}
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out.writeStrongBinder(mReceiver.asBinder());
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}
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}
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ResultReceiver(Parcel in) {
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mLocal = false;
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mHandler = null;
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mReceiver = IResultReceiver.Stub.asInterface(in.readStrongBinder());
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}
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public static final Parcelable.Creator<ResultReceiver> CREATOR
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= new Parcelable.Creator<ResultReceiver>() {
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public ResultReceiver createFromParcel(Parcel in) {
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return new ResultReceiver(in);
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}
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public ResultReceiver[] newArray(int size) {
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return new ResultReceiver[size];
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}
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};
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}
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