Use TestUtil.getPublicMethods instead of getDeclaredMethods

JaCoCo introduces private synthetic methods (even on interfaces) which
have to be skipped when checking that a 'forwarding' implementation does
forward everything. Instead we can use the existing `getPublicMethods()`
method which implicitly skips these (since they're private).

PiperOrigin-RevId: 519665752

libraries/common/src/test/java/androidx/media3/common/SimpleBasePlayerTest.java

@@ -41,6 +41,7 @@ import androidx.media3.common.text.Cue;
 import androidx.media3.common.text.CueGroup;
 import androidx.media3.common.util.Size;
 import androidx.media3.test.utils.FakeMetadataEntry;
+import androidx.media3.test.utils.TestUtil;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.common.collect.ImmutableList;
@@ -1434,7 +1435,7 @@ public class SimpleBasePlayerTest {
                     .build()));
     verifyNoMoreInteractions(listener);
     // Assert that we actually called all listeners.
-    for (Method method : Player.Listener.class.getDeclaredMethods()) {
+    for (Method method : TestUtil.getPublicMethods(Player.Listener.class)) {
       if (method.getName().equals("onAudioSessionIdChanged")
           || method.getName().equals("onSkipSilenceEnabledChanged")) {
         // Skip listeners for ExoPlayer-specific states

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/analytics/DefaultAnalyticsCollectorTest.java

@@ -201,12 +201,7 @@ public final class DefaultAnalyticsCollectorTest {
    */
   @Test
   public void defaultAnalyticsCollector_overridesAllPlayerListenerMethods() throws Exception {
-    for (Method method : Player.Listener.class.getDeclaredMethods()) {
-      if (method.isSynthetic()) {
-        // JaCoCo inserts synthetic methods. See "My code uses reflection. Why does it fail when I
-        // execute it with JaCoCo?": https://www.eclemma.org/jacoco/trunk/doc/faq.html
-        continue;
-      }
+    for (Method method : TestUtil.getPublicMethods(Player.Listener.class)) {
       assertThat(
               DefaultAnalyticsCollector.class
                   .getMethod(method.getName(), method.getParameterTypes())