API tweaks round 2

Add nullability annotations and change a static constant to a method
that returns a value.

Fixes: 126702861
Fixes: 126699926
Fixes: 126698717
Fixes: 126699057
Fixes: 126701443
Fixes: 126700882
Test: compiles
Change-Id: I96396eb8890b8b5148cf74447e08c31983398e47

telephony/java/android/telephony/TelephonyManager.java

@@ -1344,12 +1344,7 @@ public class TelephonyManager {
      */
     public static final String EXTRA_RECOVERY_ACTION = "recoveryAction";
 
-    /**
-     * The max value for the timeout passed in {@link #requestNumberVerification}.
-     * @hide
-     */
-    @SystemApi
-    public static final long MAX_NUMBER_VERIFICATION_TIMEOUT_MILLIS = 60000;
+    private static final long MAX_NUMBER_VERIFICATION_TIMEOUT_MILLIS = 60000;
 
     /**
      * Intent sent when an error occurs that debug tools should log and possibly take further
@@ -1992,6 +1987,15 @@ public class TelephonyManager {
         return cmdline;
     }
 
+    /**
+     * @return The max value for the timeout passed in {@link #requestNumberVerification}.
+     * @hide
+     */
+    @SystemApi
+    public static long getMaxNumberVerificationTimeoutMillis() {
+        return MAX_NUMBER_VERIFICATION_TIMEOUT_MILLIS;
+    }
+
     /** Kernel command line */
     private static final String sKernelCmdLine = getProcCmdLine();
 
@@ -5718,8 +5722,8 @@ public class TelephonyManager {
      *
      * @hide
      * @param range The range of phone numbers the caller expects a phone call from.
-     * @param timeoutMillis The amount of time to wait for such a call, or
-     *                      {@link #MAX_NUMBER_VERIFICATION_TIMEOUT_MILLIS}, whichever is lesser.
+     * @param timeoutMillis The amount of time to wait for such a call, or the value of
+     *                      {@link #getMaxNumberVerificationTimeoutMillis()}, whichever is lesser.
      * @param executor The {@link Executor} that callbacks should be executed on.
      * @param callback The callback to use for delivering results.
      */