Block modifying types of channels

The type of channels should not be changed once it's set.
Blocks this column from being modified.

Test: cts-tradefed run cts -m CtsTvTestCases
Change-Id: I9f7c99b4693db5553e85a1cab5cf1130425630c7

parent 2bd530e1

media/java/android/media/tv/TvContract.java

+3 −0

Original line number	Diff line number	Diff line
		@@ -1807,6 +1807,9 @@ public final class TvContract {
		* {@link #TYPE_S_DMB}, and
		* {@link #TYPE_T_DMB}.
		*
		* <p>This value cannot be changed once it's set. Trying to modify it will make the update
		* fail.
		*
		* <p>This is a required field.
		*
		* <p>Type: TEXT