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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 com.android.server.telecom;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.IntentFilter;
     23 import android.media.AudioManager;
     24 import android.os.UserHandle;
     25 import android.provider.Settings;
     26 import android.telecom.TelecomManager;
     27 
     28 import com.android.internal.util.IndentingPrintWriter;
     29 
     30 // TODO: Needed for move to system service: import com.android.internal.R;
     31 
     32 final class TtyManager implements WiredHeadsetManager.Listener {
     33     private final TtyBroadcastReceiver mReceiver = new TtyBroadcastReceiver();
     34     private final Context mContext;
     35     private final WiredHeadsetManager mWiredHeadsetManager;
     36     private int mPreferredTtyMode = TelecomManager.TTY_MODE_OFF;
     37     private int mCurrentTtyMode = TelecomManager.TTY_MODE_OFF;
     38 
     39     TtyManager(Context context, WiredHeadsetManager wiredHeadsetManager) {
     40         mContext = context;
     41         mWiredHeadsetManager = wiredHeadsetManager;
     42         mWiredHeadsetManager.addListener(this);
     43 
     44         mPreferredTtyMode = Settings.Secure.getInt(
     45                 mContext.getContentResolver(),
     46                 Settings.Secure.PREFERRED_TTY_MODE,
     47                 TelecomManager.TTY_MODE_OFF);
     48 
     49         IntentFilter intentFilter = new IntentFilter(
     50                 TelecomManager.ACTION_TTY_PREFERRED_MODE_CHANGED);
     51         mContext.registerReceiver(mReceiver, intentFilter);
     52 
     53         updateCurrentTtyMode();
     54     }
     55 
     56     boolean isTtySupported() {
     57         boolean isEnabled = mContext.getResources().getBoolean(R.bool.tty_enabled);
     58         Log.v(this, "isTtySupported: %b", isEnabled);
     59         return isEnabled;
     60     }
     61 
     62     int getCurrentTtyMode() {
     63         return mCurrentTtyMode;
     64     }
     65 
     66     @Override
     67     public void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn) {
     68         Log.v(this, "onWiredHeadsetPluggedInChanged");
     69         updateCurrentTtyMode();
     70     }
     71 
     72     private void updateCurrentTtyMode() {
     73         int newTtyMode = TelecomManager.TTY_MODE_OFF;
     74         if (isTtySupported() && mWiredHeadsetManager.isPluggedIn()) {
     75             newTtyMode = mPreferredTtyMode;
     76         }
     77         Log.v(this, "updateCurrentTtyMode, %d -> %d", mCurrentTtyMode, newTtyMode);
     78 
     79         if (mCurrentTtyMode != newTtyMode) {
     80             mCurrentTtyMode = newTtyMode;
     81             Intent ttyModeChanged = new Intent(TelecomManager.ACTION_CURRENT_TTY_MODE_CHANGED);
     82             ttyModeChanged.putExtra(TelecomManager.EXTRA_CURRENT_TTY_MODE, mCurrentTtyMode);
     83             mContext.sendBroadcastAsUser(ttyModeChanged, UserHandle.ALL);
     84 
     85             updateAudioTtyMode();
     86         }
     87     }
     88 
     89     private void updateAudioTtyMode() {
     90         String audioTtyMode;
     91         switch (mCurrentTtyMode) {
     92             case TelecomManager.TTY_MODE_FULL:
     93                 audioTtyMode = "tty_full";
     94                 break;
     95             case TelecomManager.TTY_MODE_VCO:
     96                 audioTtyMode = "tty_vco";
     97                 break;
     98             case TelecomManager.TTY_MODE_HCO:
     99                 audioTtyMode = "tty_hco";
    100                 break;
    101             case TelecomManager.TTY_MODE_OFF:
    102             default:
    103                 audioTtyMode = "tty_off";
    104                 break;
    105         }
    106         Log.v(this, "updateAudioTtyMode, %s", audioTtyMode);
    107 
    108         AudioManager audioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
    109         audioManager.setParameters("tty_mode=" + audioTtyMode);
    110     }
    111 
    112     private final class TtyBroadcastReceiver extends BroadcastReceiver {
    113         @Override
    114         public void onReceive(Context context, Intent intent) {
    115             String action = intent.getAction();
    116             Log.v(TtyManager.this, "onReceive, action: %s", action);
    117             if (action.equals(TelecomManager.ACTION_TTY_PREFERRED_MODE_CHANGED)) {
    118                 int newPreferredTtyMode = intent.getIntExtra(
    119                         TelecomManager.EXTRA_TTY_PREFERRED_MODE, TelecomManager.TTY_MODE_OFF);
    120                 if (mPreferredTtyMode != newPreferredTtyMode) {
    121                     mPreferredTtyMode = newPreferredTtyMode;
    122                     updateCurrentTtyMode();
    123                 }
    124             }
    125         }
    126     }
    127 
    128     /**
    129      * Dumps the state of the {@link TtyManager}.
    130      *
    131      * @param pw The {@code IndentingPrintWriter} to write the state to.
    132      */
    133     public void dump(IndentingPrintWriter pw) {
    134         pw.println("mCurrentTtyMode: " + mCurrentTtyMode);
    135     }
    136 }
    137