[Catalog] Surround TransitionFragment platform demos with proper sdk …

…int check to fix lint error

PiperOrigin-RevId: 449045527

catalog/java/io/material/catalog/transition/TransitionFragment.java

@@ -22,6 +22,7 @@
 import android.os.Build.VERSION;
 import android.os.Build.VERSION_CODES;
 import androidx.fragment.app.Fragment;
+import androidx.annotation.ChecksSdkIntAtLeast;
 import dagger.Provides;
 import dagger.android.ContributesAndroidInjector;
 import dagger.multibindings.IntoSet;
@@ -38,6 +39,10 @@
 /** A landing fragment that links to Transition demos for the Catalog app. */
 public class TransitionFragment extends DemoLandingFragment {
 
+  @ChecksSdkIntAtLeast(api = VERSION_CODES.LOLLIPOP)
+  private static final boolean PLATFORM_TRANSITIONS_AVAILABLE =
+      VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP;
+
   @Override
   public int getTitleResId() {
     return R.string.cat_transition_title;
@@ -61,8 +66,7 @@ public Intent createActivityIntent() {
   @Override
   public List<Demo> getAdditionalDemos() {
     List<Demo> demos = new ArrayList<>();
-    boolean shouldAddPlatformDemos = VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP;
-    if (shouldAddPlatformDemos) {
+    if (PLATFORM_TRANSITIONS_AVAILABLE) {
       demos.add(
           new Demo(R.string.cat_transition_container_transform_activity_title) {
             @Override
@@ -86,7 +90,7 @@ public Fragment createFragment() {
               }
             }));
 
-    if (shouldAddPlatformDemos) {
+    if (PLATFORM_TRANSITIONS_AVAILABLE) {
       demos.add(
           new Demo(R.string.cat_transition_shared_axis_activity_title) {
             @Override