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      1 /*
      2  * Copyright 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 com.android.server.telecom;
     18 
     19 import android.content.Context;
     20 import android.content.Intent;
     21 import android.media.AudioAttributes;
     22 import android.media.session.MediaSession;
     23 import android.view.KeyEvent;
     24 
     25 /**
     26  * Static class to handle listening to the headset media buttons.
     27  */
     28 final class HeadsetMediaButton extends CallsManagerListenerBase {
     29 
     30     // Types of media button presses
     31     static final int SHORT_PRESS = 1;
     32     static final int LONG_PRESS = 2;
     33 
     34     private static final AudioAttributes AUDIO_ATTRIBUTES = new AudioAttributes.Builder()
     35             .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
     36             .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION).build();
     37 
     38     private final MediaSession.Callback mSessionCallback = new MediaSession.Callback() {
     39         @Override
     40         public boolean onMediaButtonEvent(Intent intent) {
     41             KeyEvent event = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
     42             Log.v(this, "SessionCallback.onMediaButton()...  event = %s.", event);
     43             if ((event != null) && (event.getKeyCode() == KeyEvent.KEYCODE_HEADSETHOOK)) {
     44                 Log.v(this, "SessionCallback: HEADSETHOOK");
     45                 boolean consumed = handleHeadsetHook(event);
     46                 Log.v(this, "==> handleHeadsetHook(): consumed = %b.", consumed);
     47                 return consumed;
     48             }
     49             return true;
     50         }
     51     };
     52 
     53     private final CallsManager mCallsManager;
     54 
     55     private final MediaSession mSession;
     56 
     57     HeadsetMediaButton(Context context, CallsManager callsManager) {
     58         mCallsManager = callsManager;
     59 
     60         // Create a MediaSession but don't enable it yet. This is a
     61         // replacement for MediaButtonReceiver
     62         mSession = new MediaSession(context, HeadsetMediaButton.class.getSimpleName());
     63         mSession.setCallback(mSessionCallback);
     64         mSession.setFlags(MediaSession.FLAG_EXCLUSIVE_GLOBAL_PRIORITY
     65                 | MediaSession.FLAG_HANDLES_MEDIA_BUTTONS);
     66         mSession.setPlaybackToLocal(AUDIO_ATTRIBUTES);
     67     }
     68 
     69     /**
     70      * Handles the wired headset button while in-call.
     71      *
     72      * @return true if we consumed the event.
     73      */
     74     private boolean handleHeadsetHook(KeyEvent event) {
     75         Log.d(this, "handleHeadsetHook()...%s %s", event.getAction(), event.getRepeatCount());
     76 
     77         if (event.isLongPress()) {
     78             return mCallsManager.onMediaButton(LONG_PRESS);
     79         } else if (event.getAction() == KeyEvent.ACTION_UP && event.getRepeatCount() == 0) {
     80             return mCallsManager.onMediaButton(SHORT_PRESS);
     81         }
     82 
     83         return true;
     84     }
     85 
     86     /** ${inheritDoc} */
     87     @Override
     88     public void onCallAdded(Call call) {
     89         if (!mSession.isActive()) {
     90             mSession.setActive(true);
     91         }
     92     }
     93 
     94     /** ${inheritDoc} */
     95     @Override
     96     public void onCallRemoved(Call call) {
     97         if (!mCallsManager.hasAnyCalls()) {
     98             if (mSession.isActive()) {
     99                 mSession.setActive(false);
    100             }
    101         }
    102     }
    103 }
    104