android - Android 电话堆栈中的不同调用状态代表什么？

Question

内部 Android 类 com.android.internal.telephony.Call包含一个名为 State 的枚举，定义如下:

public enum State {
    IDLE, ACTIVE, HOLDING, DIALING, ALERTING, INCOMING, WAITING, DISCONNECTED, DISCONNECTING;

    public boolean isAlive() {
        return !(this == IDLE || this == DISCONNECTED || this == DISCONNECTING);
    }

    public boolean isRinging() {
        return this == INCOMING || this == WAITING;
    }

    public boolean isDialing() {
        return this == DIALING || this == ALERTING;
    }
}

不同的状态代表什么？

Answer 1

好的，这是我自己尝试回答的问题:

/** Call is idle. */
IDLE,
/** Call is active i.e. audio paths are connected. */
ACTIVE,
/** We have placed the call on hold. */
HOLDING,
/** Outgoing dialling call initiated. */
DIALING,
/** Outgoing call is alerting receiving party. */
ALERTING,
/** Incoming call ready for pickup. */ 
INCOMING,
/** Incoming call is waiting for pickup, while another call is in progress. */
WAITING,
/** Call is disconnected, by either party. */
DISCONNECTED,
/** Call is currently being disconnected. */
DISCONNECTING;