Merge "Update PhoneStateListener#onCallStateChanged Javadoc."

    /**

     * Callback invoked when device call state changes.

     * @param state call state

     * @param incomingNumber incoming call phone number. If application does not have

     * @param phoneNumber call phone number. If application does not have

     * {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE} permission, an empty

     * string will be passed as an argument.

     *

     * @see TelephonyManager#CALL_STATE_RINGING

     * @see TelephonyManager#CALL_STATE_OFFHOOK

     */

    public void onCallStateChanged(int state, String incomingNumber) {

    public void onCallStateChanged(int state, String phoneNumber) {

        // default implementation empty

    }