Android 电话的反射调用机制实现静默接听电话(2)

     * @return true if the call screen was shown.
     *
     * @see showCallScreen
     */
    boolean showCallScreenWithDialpad(boolean showDialpad);
    /**
     * End call or go to the Home screen
     *
     * @return whether it hung up
     */
    boolean endCall();
    /**
     * Answer the currently-ringing call.
     *
     * If there's already a current active call, that call will be
     * automatically put on hold.  If both lines are currently in use, the
     * current active call will be ended.
     *
     * TODO: provide a flag to let the caller specify what policy to use
     * if both lines are in use.  (The current behavior is hardwired to
     * "answer incoming, end ongoing", which is how the CALL button
     * is specced to behave.)
     *
     * TODO: this should be a oneway call (especially since it's called
     * directly from the key queue thread).
     */
    void answerRingingCall();
    /**
     * Silence the ringer if an incoming call is currently ringing.
     * (If vibrating, stop the vibrator also.)
     *
     * It's safe to call this if the ringer has already been silenced, or
     * even if there's no incoming call.  (If so, this method will do nothing.)
     *
     * TODO: this should be a oneway call too (see above).
     *       (Actually *all* the methods here that return void can
     *       probably be oneway.)
     */
    void silenceRinger();
    /**
     * Check if we are in either an active or holding call
     * @return true if the phone state is OFFHOOK.
     */
    boolean isOffhook();
    /**
     * Check if an incoming phone call is ringing or call waiting.
     * @return true if the phone state is RINGING.
     */
    boolean isRinging();
    /**
     * Check if the phone is idle.
     * @return true if the phone state is IDLE.