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      1 /**
      2  * Copyright (C) 2014 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.service.voice;
     18 
     19 import android.app.Service;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.res.Configuration;
     23 import android.os.Bundle;
     24 import android.os.IBinder;
     25 import android.os.Looper;
     26 import android.os.Message;
     27 import android.os.RemoteException;
     28 import android.os.ServiceManager;
     29 import com.android.internal.app.IVoiceInteractionManagerService;
     30 import com.android.internal.os.HandlerCaller;
     31 import com.android.internal.os.SomeArgs;
     32 
     33 import java.io.FileDescriptor;
     34 import java.io.PrintWriter;
     35 
     36 /**
     37  * An active voice interaction session, initiated by a {@link VoiceInteractionService}.
     38  */
     39 public abstract class VoiceInteractionSessionService extends Service {
     40 
     41     static final int MSG_NEW_SESSION = 1;
     42 
     43     IVoiceInteractionManagerService mSystemService;
     44     VoiceInteractionSession mSession;
     45 
     46     IVoiceInteractionSessionService mInterface = new IVoiceInteractionSessionService.Stub() {
     47         public void newSession(IBinder token, Bundle args, int startFlags) {
     48             mHandlerCaller.sendMessage(mHandlerCaller.obtainMessageIOO(MSG_NEW_SESSION,
     49                     startFlags, token, args));
     50 
     51         }
     52     };
     53 
     54     HandlerCaller mHandlerCaller;
     55     final HandlerCaller.Callback mHandlerCallerCallback = new HandlerCaller.Callback() {
     56         @Override
     57         public void executeMessage(Message msg) {
     58             SomeArgs args = (SomeArgs)msg.obj;
     59             switch (msg.what) {
     60                 case MSG_NEW_SESSION:
     61                     doNewSession((IBinder)args.arg1, (Bundle)args.arg2, args.argi1);
     62                     break;
     63             }
     64         }
     65     };
     66 
     67     @Override
     68     public void onCreate() {
     69         super.onCreate();
     70         mSystemService = IVoiceInteractionManagerService.Stub.asInterface(
     71                 ServiceManager.getService(Context.VOICE_INTERACTION_MANAGER_SERVICE));
     72         mHandlerCaller = new HandlerCaller(this, Looper.myLooper(),
     73                 mHandlerCallerCallback, true);
     74     }
     75 
     76     public abstract VoiceInteractionSession onNewSession(Bundle args);
     77 
     78     @Override
     79     public IBinder onBind(Intent intent) {
     80         return mInterface.asBinder();
     81     }
     82 
     83     @Override
     84     public void onConfigurationChanged(Configuration newConfig) {
     85         super.onConfigurationChanged(newConfig);
     86         if (mSession != null) {
     87             mSession.onConfigurationChanged(newConfig);
     88         }
     89     }
     90 
     91     @Override
     92     public void onLowMemory() {
     93         super.onLowMemory();
     94         if (mSession != null) {
     95             mSession.onLowMemory();
     96         }
     97     }
     98 
     99     @Override
    100     public void onTrimMemory(int level) {
    101         super.onTrimMemory(level);
    102         if (mSession != null) {
    103             mSession.onTrimMemory(level);
    104         }
    105     }
    106 
    107     @Override
    108     protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
    109         if (mSession == null) {
    110             writer.println("(no active session)");
    111         } else {
    112             writer.println("VoiceInteractionSession:");
    113             mSession.dump("  ", fd, writer, args);
    114         }
    115     }
    116 
    117     void doNewSession(IBinder token, Bundle args, int startFlags) {
    118         if (mSession != null) {
    119             mSession.doDestroy();
    120             mSession = null;
    121         }
    122         mSession = onNewSession(args);
    123         try {
    124             mSystemService.deliverNewSession(token, mSession.mSession, mSession.mInteractor);
    125             mSession.doCreate(mSystemService, token);
    126         } catch (RemoteException e) {
    127         }
    128     }
    129 }
    130