Adds the ability to Android to initiate a 2 Digit Call. (0b2bbacd) · Commits · e / os / android_frameworks_base

telephony/java/com/android/internal/telephony/gsm/GsmMmiCode.java

+67 −13

Original line number	Diff line number	Diff line
		@@ -44,6 +44,13 @@ public final class GsmMmiCode extends Handler implements MmiCode {

		//***** Constants

		// Max Size of the Short Code (aka Short String from TS 22.030 6.5.2)
		static final int MAX_LENGTH_SHORT_CODE = 2;

		// TS 22.030 6.5.2 Every Short String USSD command will end with #-key
		// (known as #-String)
		static final char END_OF_USSD_COMMAND = '#';

		// From TS 22.030 6.5.2
		static final String ACTION_ACTIVATE = "*";
		static final String ACTION_DEACTIVATE = "#";
		@@ -446,22 +453,69 @@ public final class GsmMmiCode extends Handler implements MmiCode {
		}

		/**
		* Helper function for newFromDialString. Returns true if dialString appears to be a short code
		* AND conditions are correct for it to be treated as such.
		* Helper function for newFromDialString. Returns true if dialString appears
		* to be a short code AND conditions are correct for it to be treated as
		* such.
		*/
		static private boolean isShortCode(String dialString, GSMPhone phone) {
		// Refer to TS 22.030 Figure 3.5.3.2:
		// A 1 or 2 digit "short code" is treated as USSD if it is entered while on a call or
		// does not satisfy the condition (exactly 2 digits && starts with '1').
		return ((dialString != null && dialString.length() <= 2)
		&& !PhoneNumberUtils.isEmergencyNumber(dialString)
		&& (phone.isInCall()
		\|\| !((dialString.length() == 2 && dialString.charAt(0) == '1')
		/* While contrary to TS 22.030, there is strong precedence
		* for treating "0" and "00" as call setup strings.
		if (dialString == null) {
		return false;
		}

		// Illegal dial string characters will give a ZERO length.
		// At this point we do not want to crash as any application with
		// call privileges may send a non dial string.
		// It return false as when the dialString is equal to NULL.
		if (dialString.length() == 0) {
		return false;
		}

		if (PhoneNumberUtils.isEmergencyNumber(dialString)) {
		return false;
		} else {
		return isShortCodeUSSD(dialString, phone);
		}
		}

		/**
		* Helper function for isShortCode. Returns true if dialString appears to be
		* a short code and it is a USSD structure
		*
		* According to the 3PGG TS 22.030 specification Figure 3.5.3.2: A 1 or 2
		* digit "short code" is treated as USSD if it is entered while on a call or
		* does not satisfy the condition (exactly 2 digits && starts with '1'), there
		* are however exceptions to this rule (see below)
		*
		* Exception (1) to Call initiation is: If the user of the device is already in a call
		* and enters a Short String without any #-key at the end and the length of the Short String is
		* equal or less then the MAX_LENGTH_SHORT_CODE [constant that is equal to 2]
		*
		* The phone shall initiate a USSD/SS commands.
		*
		* Exception (2) to Call initiation is: If the user of the device enters one
		* Digit followed by the #-key. This rule defines this String as the
		* #-String which is a USSD/SS command.
		*
		* The phone shall initiate a USSD/SS command.
		*/
		\|\| dialString.equals("0")
		\|\| dialString.equals("00"))));
		static private boolean isShortCodeUSSD(String dialString, GSMPhone phone) {
		if (dialString != null) {
		if (phone.isInCall()) {
		// The maximum length of a Short Code (aka Short String) is 2
		if (dialString.length() <= MAX_LENGTH_SHORT_CODE) {
		return true;
		}
		}

		// The maximum length of a Short Code (aka Short String) is 2
		if (dialString.length() <= MAX_LENGTH_SHORT_CODE) {
		if (dialString.charAt(dialString.length() - 1) == END_OF_USSD_COMMAND) {
		return true;
		}
		}
		}
		return false;
		}

		/**