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      1 /*
      2  * Copyright (C) 2013 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.phone;
     18 
     19 import com.google.android.collect.Lists;
     20 
     21 import android.content.BroadcastReceiver;
     22 import android.content.Context;
     23 import android.content.Intent;
     24 import android.content.IntentFilter;
     25 import android.os.SystemProperties;
     26 import android.util.Log;
     27 
     28 import java.util.List;
     29 
     30 /**
     31  * Listens for and caches headset state.  Used By the AudioRouter for maintaining
     32  * overall audio state for use in the UI layer. Also provides method for connecting the bluetooth
     33  * headset to the phone call.
     34  */
     35 public class WiredHeadsetManager {
     36     private static final String LOG_TAG = WiredHeadsetManager.class.getSimpleName();
     37     private static final boolean DBG =
     38             (PhoneGlobals.DBG_LEVEL >= 1) && (SystemProperties.getInt("ro.debuggable", 0) == 1);
     39     private static final boolean VDBG = (PhoneGlobals.DBG_LEVEL >= 2);
     40 
     41     // True if a wired headset is currently plugged in, based on the state
     42     // from the latest Intent.ACTION_HEADSET_PLUG broadcast we received in
     43     // mReceiver.onReceive().
     44     private boolean mIsHeadsetPlugged = false;
     45     private final WiredHeadsetBroadcastReceiver mReceiver;
     46     private final List<WiredHeadsetListener> mListeners = Lists.newArrayList();
     47 
     48     public WiredHeadsetManager(Context context) {
     49         mReceiver = new WiredHeadsetBroadcastReceiver();
     50 
     51         // Register for misc other intent broadcasts.
     52         IntentFilter intentFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);
     53         context.registerReceiver(mReceiver, intentFilter);
     54     }
     55 
     56     /**
     57      * Returns connection state of the wires headset.
     58      */
     59     public boolean isHeadsetPlugged() {
     60         return mIsHeadsetPlugged;
     61     }
     62 
     63     /**
     64      * Add a listener for wired headset connection status.
     65      */
     66     public void addWiredHeadsetListener(WiredHeadsetListener listener) {
     67         if (!mListeners.contains(listener)) {
     68             mListeners.add(listener);
     69         }
     70     }
     71 
     72     /**
     73      * Called when we get an event from the system for the headset connection state.
     74      */
     75     private void onHeadsetConnection(boolean pluggedIn) {
     76         if (DBG) {
     77             Log.d(LOG_TAG, "Wired headset connected: " +  pluggedIn);
     78         }
     79         mIsHeadsetPlugged = pluggedIn;
     80 
     81         notifyListeners();
     82     }
     83 
     84     private void notifyListeners() {
     85         for (int i = 0; i < mListeners.size(); i++) {
     86             mListeners.get(i).onWiredHeadsetConnection(mIsHeadsetPlugged);
     87         }
     88     }
     89 
     90     /**
     91      * Receiver for misc intent broadcasts the BluetoothManager cares about.
     92      */
     93     private class WiredHeadsetBroadcastReceiver extends BroadcastReceiver {
     94         @Override
     95         public void onReceive(Context context, Intent intent) {
     96             String action = intent.getAction();
     97 
     98             if (action.equals(Intent.ACTION_HEADSET_PLUG)) {
     99                 if (VDBG) Log.d(LOG_TAG, "mReceiver: ACTION_HEADSET_PLUG");
    100                 if (VDBG) Log.d(LOG_TAG, "    state: " + intent.getIntExtra("state", 0));
    101                 if (VDBG) Log.d(LOG_TAG, "    name: " + intent.getStringExtra("name"));
    102                 onHeadsetConnection(intent.getIntExtra("state", 0) == 1);
    103             }
    104         }
    105     }
    106 
    107     /**
    108      * Listeners for those that want to know about the headset state.
    109      */
    110     public interface WiredHeadsetListener {
    111         void onWiredHeadsetConnection(boolean pluggedIn);
    112     }
    113 }
    114