Add a debug log to HomeVisibilityListener.

Bug: 290747720
Test: atest ActivityManagerTest#testHomeVisibilityListener
Change-Id: I9af0cd64e6a525ff82e9c5bc67bf4928ea6b8c44

core/java/android/app/HomeVisibilityListener.java

@@ -25,6 +25,7 @@ import android.annotation.SystemApi;
 import android.annotation.TestApi;
 import android.content.Context;
 import android.os.Binder;
+import android.util.Log;
 
 import java.util.List;
 import java.util.concurrent.Executor;
@@ -40,6 +41,8 @@ import java.util.concurrent.Executor;
 @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
 @TestApi
 public abstract class HomeVisibilityListener {
+    private static final String TAG = HomeVisibilityListener.class.getSimpleName();
+    private static final boolean DBG = Log.isLoggable(TAG, Log.DEBUG);
     private ActivityTaskManager mActivityTaskManager;
     private Executor mExecutor;
     private int mMaxScanTasksForHomeVisibility;
@@ -102,6 +105,11 @@ public abstract class HomeVisibilityListener {
 
         for (int i = 0, taskSize = tasksTopToBottom.size(); i < taskSize; ++i) {
             ActivityManager.RunningTaskInfo task = tasksTopToBottom.get(i);
+            if (DBG) {
+                Log.d(TAG, "Task#" + i + ": activity=" + task.topActivity
+                        + ", visible=" + task.isVisible()
+                        + ", flg=" + Integer.toHexString(task.baseIntent.getFlags()));
+            }
             if (!task.isVisible()
                     || (task.baseIntent.getFlags() & FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS) != 0) {
                 continue;