DO NOT MERGE Add LifecycleCallback adapter.

Add a lifecycle callback adapter to remove empty code blocks.

Bug: 205342008
Test: n/a small code clean up.
Change-Id: I5454fbcb24c26079369fd20e519c809b00c261ae

libs/WindowManager/Jetpack/src/androidx/window/common/EmptyLifecycleCallbacksAdapter.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.window.common;
+
+import android.app.Activity;
+import android.app.Application;
+import android.os.Bundle;
+
+/**
+ * An empty implementation of {@link Application.ActivityLifecycleCallbacks} derived classes can
+ * implement the methods necessary.
+ */
+public class EmptyLifecycleCallbacksAdapter implements Application.ActivityLifecycleCallbacks {
+    @Override
+    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
+    }
+
+    @Override
+    public void onActivityStarted(Activity activity) {
+    }
+
+    @Override
+    public void onActivityResumed(Activity activity) {
+    }
+
+    @Override
+    public void onActivityPaused(Activity activity) {
+    }
+
+    @Override
+    public void onActivityStopped(Activity activity) {
+    }
+
+    @Override
+    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
+    }
+
+    @Override
+    public void onActivityDestroyed(Activity activity) {
+    }
+}

libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitController.java

@@ -28,7 +28,6 @@ import android.app.Activity;
 import android.app.ActivityClient;
 import android.app.ActivityOptions;
 import android.app.ActivityThread;
-import android.app.Application.ActivityLifecycleCallbacks;
 import android.app.Instrumentation;
 import android.content.Context;
 import android.content.Intent;
@@ -41,6 +40,8 @@ import android.os.Looper;
 import android.window.TaskFragmentInfo;
 import android.window.WindowContainerTransaction;
 
+import androidx.window.common.EmptyLifecycleCallbacksAdapter;
+
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
@@ -759,11 +760,7 @@ public class SplitController implements JetpackTaskFragmentOrganizer.TaskFragmen
         return shouldRetainAssociatedContainer(finishingContainer, associatedContainer);
     }
 
-    private final class LifecycleCallbacks implements ActivityLifecycleCallbacks {
+    private final class LifecycleCallbacks extends EmptyLifecycleCallbacksAdapter {
-
-        @Override
-        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
-        }
 
         @Override
         public void onActivityPostCreated(Activity activity, Bundle savedInstanceState) {
@@ -774,30 +771,6 @@ public class SplitController implements JetpackTaskFragmentOrganizer.TaskFragmen
             SplitController.this.onActivityCreated(activity);
         }
 
-        @Override
-        public void onActivityStarted(Activity activity) {
-        }
-
-        @Override
-        public void onActivityResumed(Activity activity) {
-        }
-
-        @Override
-        public void onActivityPaused(Activity activity) {
-        }
-
-        @Override
-        public void onActivityStopped(Activity activity) {
-        }
-
-        @Override
-        public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
-        }
-
-        @Override
-        public void onActivityDestroyed(Activity activity) {
-        }
-
         @Override
         public void onActivityConfigurationChanged(Activity activity) {
             SplitController.this.onActivityConfigurationChanged(activity);