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
17package android.service.voice;
18
19import android.app.Service;
20import android.content.Context;
21import android.content.Intent;
22import android.content.res.Configuration;
23import android.os.Bundle;
24import android.os.IBinder;
25import android.os.Looper;
26import android.os.Message;
27import android.os.RemoteException;
28import android.os.ServiceManager;
29import com.android.internal.app.IVoiceInteractionManagerService;
30import com.android.internal.os.HandlerCaller;
31import com.android.internal.os.SomeArgs;
32
33import java.io.FileDescriptor;
34import java.io.PrintWriter;
35
36/**
37 * An active voice interaction session, initiated by a {@link VoiceInteractionService}.
38 */
39public 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