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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.telecomm;
import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import com.android.internal.os.SomeArgs;
import com.android.internal.telecomm.IInCallAdapter;
import com.android.internal.telecomm.IInCallService;
/**
* This service is implemented by any app that wishes to provide the user-interface for managing
* phone calls. Telecomm binds to this service while there exists a live (active or incoming)
* call, and uses it to notify the in-call app of any live and and recently disconnected calls.
* TODO(santoscordon): Needs more/better description of lifecycle once the interface is better
* defined.
* TODO(santoscordon): What happens if two or more apps on a given device implement this interface?
*/
public abstract class InCallService extends Service {
private static final int MSG_SET_IN_CALL_ADAPTER = 1;
private static final int MSG_ADD_CALL = 2;
private static final int MSG_UPDATE_CALL = 3;
private static final int MSG_SET_POST_DIAL = 4;
private static final int MSG_SET_POST_DIAL_WAIT = 5;
private static final int MSG_ON_AUDIO_STATE_CHANGED = 6;
/** Default Handler used to consolidate binder method calls onto a single thread. */
private final Handler mHandler = new Handler(Looper.getMainLooper()) {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_SET_IN_CALL_ADAPTER:
mAdapter = new InCallAdapter((IInCallAdapter) msg.obj);
onAdapterAttached(mAdapter);
break;
case MSG_ADD_CALL:
addCall((InCallCall) msg.obj);
break;
case MSG_UPDATE_CALL:
updateCall((InCallCall) msg.obj);
break;
case MSG_SET_POST_DIAL: {
SomeArgs args = (SomeArgs) msg.obj;
try {
String callId = (String) args.arg1;
String remaining = (String) args.arg2;
setPostDial(callId, remaining);
} finally {
args.recycle();
}
break;
}
case MSG_SET_POST_DIAL_WAIT: {
SomeArgs args = (SomeArgs) msg.obj;
try {
String callId = (String) args.arg1;
String remaining = (String) args.arg2;
setPostDialWait(callId, remaining);
} finally {
args.recycle();
}
break;
}
case MSG_ON_AUDIO_STATE_CHANGED:
onAudioStateChanged((CallAudioState) msg.obj);
break;
default:
break;
}
}
};
/** Manages the binder calls so that the implementor does not need to deal with it. */
private final class InCallServiceBinder extends IInCallService.Stub {
/** {@inheritDoc} */
@Override
public void setInCallAdapter(IInCallAdapter inCallAdapter) {
mHandler.obtainMessage(MSG_SET_IN_CALL_ADAPTER, inCallAdapter).sendToTarget();
}
/** {@inheritDoc} */
@Override
public void addCall(InCallCall call) {
mHandler.obtainMessage(MSG_ADD_CALL, call).sendToTarget();
}
/** {@inheritDoc} */
@Override
public void updateCall(InCallCall call) {
mHandler.obtainMessage(MSG_UPDATE_CALL, call).sendToTarget();
}
@Override
public void setPostDial(String callId, String remaining) {
SomeArgs args = SomeArgs.obtain();
args.arg1 = callId;
args.arg2 = remaining;
mHandler.obtainMessage(MSG_SET_POST_DIAL, args).sendToTarget();
}
@Override
public void setPostDialWait(String callId, String remaining) {
SomeArgs args = SomeArgs.obtain();
args.arg1 = callId;
args.arg2 = remaining;
mHandler.obtainMessage(MSG_SET_POST_DIAL_WAIT, args).sendToTarget();
}
/** {@inheritDoc} */
@Override
public void onAudioStateChanged(CallAudioState audioState) {
mHandler.obtainMessage(MSG_ON_AUDIO_STATE_CHANGED, audioState).sendToTarget();
}
}
private final InCallServiceBinder mBinder;
private InCallAdapter mAdapter;
protected InCallService() {
mBinder = new InCallServiceBinder();
}
@Override
public final IBinder onBind(Intent intent) {
return mBinder;
}
/**
* @return The attached {@link CallServiceSelectorAdapter} if attached, or null otherwise.
*/
protected final InCallAdapter getAdapter() {
return mAdapter;
}
/**
* Lifecycle callback which is called when this {@link InCallService} has been attached
* to a {@link InCallAdapter}, indicating {@link #getAdapter()} is now safe to use.
*
* @param adapter The adapter now attached to this in-call service.
*/
protected void onAdapterAttached(InCallAdapter adapter) {
}
/**
* Indicates to the in-call app that a new call has been created and an appropriate
* user-interface should be built and shown to notify the user.
*
* @param call Information about the new call.
*/
protected abstract void addCall(InCallCall call);
/**
* Call when information about a call has changed.
*
* @param call Information about the new call.
*/
protected abstract void updateCall(InCallCall call);
/**
* Indicates to the in-call app that the specified call is active but in a "post-dial" state
* where Telecomm is now sending some dual-tone multi-frequency signaling (DTMF) tones appended
* to the dialed number. Normal transitions are to {@link #setPostDialWait(String,String)} when
* the post-dial string requires user confirmation to proceed, {@link #setActive(String)} when
* the post-dial tones are completed.
*
* @param callId The identifier of the call changing state.
* @param remaining The remaining postdial string to be dialed.
*/
protected abstract void setPostDial(String callId, String remaining);
/**
* Indicates to the in-call app that the specified call was in the
* {@link #setPostDial(String,String)} state but is now waiting for user confirmation before the
* remaining digits can be sent. Normal transitions are to {@link #setPostDial(String,String)}
* when the user asks Telecomm to proceed with the post-dial sequence and the in-call app
* informs Telecomm of this by invoking {@link InCallAdapter#postDialContinue(String)}.
*
* @param callId The identifier of the call changing state.
* @param remaining The remaining postdial string to be dialed.
*/
protected abstract void setPostDialWait(String callId, String remaining);
/**
* Called when the audio state changes.
*
* @param audioState The new {@link CallAudioState}.
*/
protected abstract void onAudioStateChanged(CallAudioState audioState);
}
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