Merge "Fix error prone warnings"

core/java/android/net/sntp/Duration64.java

@@ -26,7 +26,7 @@ import java.time.Duration;
  *
  * @hide
  */
-public class Duration64 {
+public final class Duration64 {
 
     public static final Duration64 ZERO = new Duration64(0);
     private final long mBits;

core/java/android/net/sntp/Timestamp64.java

@@ -15,6 +15,8 @@
  */
 package android.net.sntp;
 
+import android.text.TextUtils;
+
 import com.android.internal.annotations.VisibleForTesting;
 
 import java.time.Instant;
@@ -113,7 +115,7 @@ public final class Timestamp64 {
 
     @Override
     public String toString() {
-        return String.format("%08x.%08x", mEraSeconds, mFractionBits);
+        return TextUtils.formatSimple("%08x.%08x", mEraSeconds, mFractionBits);
     }
 
     /** Returns the instant represented by this value in the specified NTP era. */

core/tests/coretests/src/android/net/sntp/Duration64Test.java

@@ -21,13 +21,17 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertTrue;
 
+import androidx.test.runner.AndroidJUnit4;
+
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.time.Duration;
 import java.time.Instant;
 import java.time.LocalDateTime;
 import java.time.ZoneOffset;
 
+@RunWith(AndroidJUnit4.class)
 public class Duration64Test {
 
     @Test

core/tests/coretests/src/android/net/sntp/Timestamp64Test.java

@@ -21,13 +21,17 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
+import androidx.test.runner.AndroidJUnit4;
+
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.time.Instant;
 import java.util.HashSet;
 import java.util.Random;
 import java.util.Set;
 
+@RunWith(AndroidJUnit4.class)
 public class Timestamp64Test {
 
     @Test
@@ -191,6 +195,7 @@ public class Timestamp64Test {
         }
     }
 
+    @SuppressWarnings("JavaInstantGetSecondsGetNano")
     private static void assertInstantCreationOnlyFractionExact(
             int fractionBits, long expectedNanos) {
         Timestamp64 timestamp64 = Timestamp64.fromComponents(0, fractionBits);
@@ -201,6 +206,7 @@ public class Timestamp64Test {
         assertEquals(expectedNanos, instant.getNano());
     }
 
+    @SuppressWarnings("JavaInstantGetSecondsGetNano")
     private static void assertNanosWithTruncationAllowed(long expectedNanos, Instant instant) {
         // Allow for < 1ns difference due to truncation.
         long actualNanos = instant.getNano();
@@ -208,6 +214,7 @@ public class Timestamp64Test {
                 actualNanos == expectedNanos || actualNanos == expectedNanos - 1);
     }
 
+    @SuppressWarnings("JavaInstantGetSecondsGetNano")
     @Test
     public void testMillisRandomizationConstant() {
         // Mathematically, we can say that to represent 1000 different values, we need 10 binary