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/*
* Copyright 2014, 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;
/**
* Defines call-state constants of the different states in which a call can exist. Although states
* have the notion of normal transitions, due to the volatile nature of telephony systems, code
* that uses these states should be resilient to unexpected state changes outside of what is
* considered traditional.
*/
public enum CallState {
/**
* Indicates that a call is new and not connected. This is used as the default state internally
* within Telecomm and should not be used between Telecomm and call services. Call services are
* not expected to ever interact with NEW calls, but {@link InCallService}s will see calls in
* this state.
*/
NEW,
/**
* Indicates that a call is outgoing and in the dialing state. A call transitions to this state
* once an outgoing call has begun (e.g., user presses the dial button in Dialer). Calls in this
* state usually transition to {@link #ACTIVE} if the call was answered or {@link #DISCONNECTED}
* if the call was disconnected somehow (e.g., failure or cancellation of the call by the user).
*/
DIALING,
/**
* Indicates that a call is incoming and the user still has the option of answering, rejecting,
* or doing nothing with the call. This state is usually associated with some type of audible
* ringtone. Normal transitions are to {@link #ACTIVE} if answered or {@link #DISCONNECTED}
* otherwise.
*/
RINGING,
/**
* Indicates that the 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 #POST_DIAL_WAIT} when the post-dial string requires user
* confirmation to proceed, {@link #ACTIVE} when the post-dial tones are completed, or
* {@link #DISCONNECTED}.
*/
POST_DIAL,
/**
* Indicates that the call was in the {@link #POST_DIAL} state but is now waiting for user
* confirmation before the remaining digits can be sent. Normal transitions are to
* {@link #POST_DIAL} when the user asks Telecomm to proceed with the post-dial sequence.
*/
POST_DIAL_WAIT,
/**
* Indicates that a call is currently connected to another party and a communication channel is
* open between them. The normal transition to this state is by the user answering a
* {@link #DIALING} call or a {@link #RINGING} call being answered by the other party.
*/
ACTIVE,
/**
* Indicates that the call is currently on hold. In this state, the call is not terminated
* but no communication is allowed until the call is no longer on hold. The typical transition
* to this state is by the user putting an {@link #ACTIVE} call on hold by explicitly performing
* an action, such as clicking the hold button.
*/
ON_HOLD,
/**
* Indicates that a call is currently disconnected. All states can transition to this state
* by the call service giving notice that the connection has been severed. When the user
* explicitly ends a call, it will not transition to this state until the call service confirms
* the disconnection or communication was lost to the call service currently responsible for
* this call (e.g., call service crashes).
*/
DISCONNECTED,
/**
* Indicates that the call was attempted (mostly in the context of outgoing, at least at the
* time of writing) but cancelled before it was successfully connected.
* @hide
*/
ABORTED;
}
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