call类的java⽂件_Call.java
Call.java ⽂件位于 frameworks/ba/telephony/java/com/android/internal/telephony ⽬录下，它是⼀个抽象类，描述了phone 中通话⽅⾯信息：
刚开始⽤⼀个枚举定义了电话的所有状态，为：
IDLE, ACTIVE, HOLDING, DIALING, ALERTING, INCOMING, WAITING, DISCONNECTED, DISCONNECTING;
并且对这些状态进⾏了归类，具体为：
isActive = !(IDLE || DISCONNECTED || DISCONNECTING);
6年级数学补习isRinging = (INCOMING || WAITING);
isDialing = (DIALING || ALERTING);filon
其中定义的⽅法有：
1. public abstract List getConnection(); //获取Call中所有的Connection
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2. public abstract Phone getPhone(); //取得包含Call的Phone
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3. public abstract boolean isMultiparty(); //是否有多个通话⽅
4. public abstract void hangup() throws CallStateException; //挂断通话
5. public boolean hasConnection(Connection c); //判断Call是否包含某个特定的Connection
6. public boolean hasConnections(); //判断Call中是否包含Connection
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zigzag7. public State getState(); //返回Call的状态
8. public boolean isIdle(); //返回true，如果Call中仅包含disconnected Connection诧异意思
9. public Connection getEarlistConnection(); //返回最早建⽴的Connection
10. public long getEarlistCreateTime(); //返回最早的Connection的建⽴时间
11. public long getEarlistConnectionTime(); //返回最早的Connection的连接时间
12. public boolean isDialingOrAlerting();
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13. public boolean isRinging();
14. public Connection getLastestConnection(); //返回最新建⽴的Connection
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15. public void hangupIfAlive(); //Hangup call if it is alive
