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      1 /*
      2  * Copyright (C) 2018 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.incallui;
     18 
     19 import android.annotation.TargetApi;
     20 import android.os.Handler;
     21 import android.os.HandlerThread;
     22 import android.os.Looper;
     23 import android.telecom.Call.RttCall;
     24 import com.android.dialer.common.LogUtil;
     25 import com.android.dialer.common.concurrent.ThreadUtil;
     26 import com.android.incallui.InCallPresenter.InCallState;
     27 import com.android.incallui.InCallPresenter.InCallStateListener;
     28 import com.android.incallui.call.CallList;
     29 import com.android.incallui.call.DialerCall;
     30 import com.android.incallui.rtt.protocol.RttCallScreen;
     31 import com.android.incallui.rtt.protocol.RttCallScreenDelegate;
     32 import java.io.IOException;
     33 
     34 /**
     35  * Logic related to the {@link RttCallScreen} and for managing changes to the RTT calling surfaces
     36  * based on other user interface events and incoming events.
     37  */
     38 @TargetApi(28)
     39 public class RttCallPresenter implements RttCallScreenDelegate, InCallStateListener {
     40 
     41   private RttCallScreen rttCallScreen;
     42   private RttCall rttCall;
     43   private HandlerThread handlerThread;
     44   private RemoteMessageHandler remoteMessageHandler;
     45 
     46   @Override
     47   public void initRttCallScreenDelegate(RttCallScreen rttCallScreen) {
     48     this.rttCallScreen = rttCallScreen;
     49   }
     50 
     51   @Override
     52   public void onLocalMessage(String message) {
     53     if (rttCall == null) {
     54       LogUtil.w("RttCallPresenter.onLocalMessage", "Rtt Call is not started yet");
     55       return;
     56     }
     57     remoteMessageHandler.writeMessage(message);
     58   }
     59 
     60   @Override
     61   public void onRttCallScreenUiReady() {
     62     LogUtil.enterBlock("RttCallPresenter.onRttCallScreenUiReady");
     63     InCallPresenter.getInstance().addListener(this);
     64     startListenOnRemoteMessage();
     65   }
     66 
     67   @Override
     68   public void onRttCallScreenUiUnready() {
     69     LogUtil.enterBlock("RttCallPresenter.onRttCallScreenUiUnready");
     70     InCallPresenter.getInstance().removeListener(this);
     71     stopListenOnRemoteMessage();
     72   }
     73 
     74   @Override
     75   public void onStateChange(InCallState oldState, InCallState newState, CallList callList) {
     76     LogUtil.enterBlock("RttCallPresenter.onStateChange");
     77     if (newState == InCallState.INCALL) {
     78       startListenOnRemoteMessage();
     79     }
     80   }
     81 
     82   private void startListenOnRemoteMessage() {
     83     DialerCall call = CallList.getInstance().getActiveCall();
     84     if (call == null) {
     85       LogUtil.i("RttCallPresenter.startListenOnRemoteMessage", "call is active yet");
     86       return;
     87     }
     88     rttCall = call.getRttCall();
     89     if (rttCall == null) {
     90       LogUtil.i("RttCallPresenter.startListenOnRemoteMessage", "RTT Call is not started yet");
     91       return;
     92     }
     93     if (handlerThread != null && handlerThread.isAlive()) {
     94       LogUtil.i("RttCallPresenter.startListenOnRemoteMessage", "already running");
     95       return;
     96     }
     97     handlerThread = new HandlerThread("RttCallRemoteMessageHandler");
     98     handlerThread.start();
     99     remoteMessageHandler =
    100         new RemoteMessageHandler(handlerThread.getLooper(), rttCall, rttCallScreen);
    101     remoteMessageHandler.start();
    102   }
    103 
    104   private void stopListenOnRemoteMessage() {
    105     if (handlerThread != null && handlerThread.isAlive()) {
    106       handlerThread.quit();
    107     }
    108   }
    109 
    110   private static class RemoteMessageHandler extends Handler {
    111     private static final int START = 1;
    112     private static final int READ_MESSAGE = 2;
    113     private static final int WRITE_MESSAGE = 3;
    114 
    115     private final RttCall rttCall;
    116     private final RttCallScreen rttCallScreen;
    117 
    118     RemoteMessageHandler(Looper looper, RttCall rttCall, RttCallScreen rttCallScreen) {
    119       super(looper);
    120       this.rttCall = rttCall;
    121       this.rttCallScreen = rttCallScreen;
    122     }
    123 
    124     @Override
    125     public void handleMessage(android.os.Message msg) {
    126       switch (msg.what) {
    127         case START:
    128           sendEmptyMessage(READ_MESSAGE);
    129           break;
    130         case READ_MESSAGE:
    131           try {
    132             final String message = rttCall.readImmediately();
    133             if (message != null) {
    134               ThreadUtil.postOnUiThread(() -> rttCallScreen.onRemoteMessage(message));
    135             }
    136           } catch (IOException e) {
    137             LogUtil.e("RttCallPresenter.RemoteMessageHandler.handleMessage", "read message", e);
    138           }
    139           sendEmptyMessageDelayed(READ_MESSAGE, 200);
    140           break;
    141         case WRITE_MESSAGE:
    142           try {
    143             rttCall.write((String) msg.obj);
    144           } catch (IOException e) {
    145             LogUtil.e("RttCallPresenter.RemoteMessageHandler.handleMessage", "write message", e);
    146           }
    147           break;
    148         default: // fall out
    149       }
    150     }
    151 
    152     void start() {
    153       sendEmptyMessage(START);
    154     }
    155 
    156     void writeMessage(String message) {
    157       sendMessage(obtainMessage(WRITE_MESSAGE, message));
    158     }
    159   }
    160 }
    161