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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 com.android.incallui;
import com.google.android.collect.Sets;
import com.google.common.base.Preconditions;
import android.content.Context;
import android.content.Intent;
import com.android.services.telephony.common.Call;
import java.util.Set;
/**
* Takes updates from the CallList and notifies the InCallActivity (UI)
* of the changes.
* Responsible for starting the activity for a new call and finishing the activity when all calls
* are disconnected.
* Creates and manages the in-call state and provides a listener pattern for the presenters
* that want to listen in on the in-call state changes.
* TODO(klp): This class has become more of a state machine at this point. Consider renaming.
*/
public class InCallPresenter implements CallList.Listener {
private static InCallPresenter sInCallPresenter;
private final StatusBarNotifier mStatusBarNotifier;
private final Set<InCallStateListener> mListeners = Sets.newHashSet();
private InCallState mInCallState = InCallState.HIDDEN;
private InCallActivity mInCallActivity;
public static InCallPresenter getInstance() {
Preconditions.checkNotNull(sInCallPresenter);
return sInCallPresenter;
}
public static synchronized InCallPresenter init(Context context) {
Preconditions.checkState(sInCallPresenter == null);
sInCallPresenter = new InCallPresenter(context);
return sInCallPresenter;
}
public void setActivity(InCallActivity inCallActivity) {
mInCallActivity = inCallActivity;
mInCallState = InCallState.STARTED;
Logger.d(this, "UI Initialized");
// Since the UI just came up, imitate an update from the call list
// to set the proper UI state.
onCallListChange(CallList.getInstance());
}
/**
* Called when there is a change to the call list.
* Sets the In-Call state for the entire in-call app based on the information it gets from
* CallList. Dispatches the in-call state to all listeners. Can trigger the creation or
* destruction of the UI based on the states that is calculates.
*/
@Override
public void onCallListChange(CallList callList) {
// fast fail if we are still starting up
if (mInCallState == InCallState.STARTING_UP) {
Logger.d(this, "Already on STARTING_UP, ignoring until ready");
return;
}
InCallState newState = getPotentialStateFromCallList(callList);
newState = startOrFinishUi(newState);
// Set the new state before announcing it to the world
mInCallState = newState;
// notify listeners of new state
for (InCallStateListener listener : mListeners) {
Logger.d(this, "Notify " + listener + " of state " + mInCallState.toString());
listener.onStateChange(mInCallState, callList);
}
}
/**
* Given the call list, return the state in which the in-call screen should be.
*/
public InCallState getPotentialStateFromCallList(CallList callList) {
InCallState newState = InCallState.HIDDEN;
if (callList.getIncomingCall() != null) {
newState = InCallState.INCOMING;
} else if (callList.getActiveCall() != null ||
callList.getBackgroundCall() != null) {
newState = InCallState.INCALL;
}
return newState;
}
public void addListener(InCallStateListener listener) {
Preconditions.checkNotNull(listener);
mListeners.add(listener);
}
public void removeListener(InCallStateListener listener) {
Preconditions.checkNotNull(listener);
mListeners.remove(listener);
}
/**
* When the state of in-call changes, this is the first method to get called. It determines if
* the UI needs to be started or finished depending on the new state and does it.
* It returns a potential new middle state (STARTING_UP) if appropriate.
*/
private InCallState startOrFinishUi(InCallState newState) {
Logger.d(this, "startOrFInishUi: " + newState.toString());
// TODO(klp): Consider a proper state machine implementation
// if we need to show something, we need to start the Ui...
if (!newState.isHidden()) {
// When we attempt to go to any state from HIDDEN, it means that we need to create the
// entire UI. However, the StatusBarNotifier is in charge of starting up the Ui because
// it has special behavior in case we have to deal with an immersive foreground app.
// We set the STARTING_UP state to let StatusBarNotifier know it needs to start the
// the Ui.
if (mInCallState.isHidden()) {
return InCallState.STARTING_UP;
}
} else if (mInCallActivity != null) {
// Null out reference before we start end sequence
InCallActivity temp = mInCallActivity;
mInCallActivity = null;
temp.finish();
}
return newState;
}
/**
* Private constructor. Must use getInstance() to get this singleton.
*/
private InCallPresenter(Context context) {
Preconditions.checkNotNull(context);
mStatusBarNotifier = new StatusBarNotifier(context);
addListener(mStatusBarNotifier);
CallList.getInstance().addListener(this);
}
/**
* All the main states of InCallActivity.
*/
public enum InCallState {
// InCall Screen is off and there are no calls
HIDDEN,
// In call is in the process of starting up
STARTING_UP,
// In call has started but is not displaying any information
STARTED,
// Incoming-call screen is up
INCOMING,
// In-call experience is showing
INCALL;
public boolean isIncoming() {
return (this == INCOMING);
}
public boolean isHidden() {
return (this == HIDDEN);
}
}
/**
* Interface implemented by classes that need to know about the InCall State.
*/
public interface InCallStateListener {
// TODO(klp): Enhance state to contain the call objects instead of passing CallList
public void onStateChange(InCallState state, CallList callList);
}
}
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