From 8b361d918ecf9f1d9c5ca3f22549c9058dc2fe37 Mon Sep 17 00:00:00 2001
From: Sunny Goyal <sunnygoyal@google.com>
Date: Fri, 9 Feb 2018 10:41:03 -0800
Subject: [PATCH] Adding utility method to check the current home app

Test: Verified the libary with Launcher
Change-Id: I37c0c0a6c74484e6a34497168d841e4a92207b5b
---
 .../shared/system/PackageManagerWrapper.java  | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/system/PackageManagerWrapper.java b/packages/SystemUI/shared/src/com/android/systemui/shared/system/PackageManagerWrapper.java
index d5e6e6efb3cf9..6fa7db3f2cdbb 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/system/PackageManagerWrapper.java
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/system/PackageManagerWrapper.java
@@ -21,8 +21,12 @@ import android.content.ComponentName;
 import android.content.pm.ActivityInfo;
 import android.content.pm.IPackageManager;
 import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.os.RemoteException;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class PackageManagerWrapper {
 
     private static final String TAG = "PackageManagerWrapper";
@@ -47,4 +51,42 @@ public class PackageManagerWrapper {
             return null;
         }
     }
+
+    /**
+     * @return true if the packageName belongs to the current preferred home app on the device.
+     *
+     * If will also return false if there are multiple home apps and the user has not picked any
+     * preferred home, in which case the user would see a disambiguation screen on going to home.
+     */
+    public boolean isDefaultHomeActivity(String packageName) {
+        List<ResolveInfo> allHomeCandidates = new ArrayList<>();
+        ComponentName home;
+        try {
+            home = mIPackageManager.getHomeActivities(allHomeCandidates);
+        } catch (RemoteException e) {
+            e.printStackTrace();
+            return false;
+        }
+
+        if (home != null && packageName.equals(home.getPackageName())) {
+            return true;
+        }
+
+        // Find the launcher with the highest priority and return that component if there are no
+        // other home activity with the same priority.
+        int lastPriority = Integer.MIN_VALUE;
+        ComponentName lastComponent = null;
+        final int size = allHomeCandidates.size();
+        for (int i = 0; i < size; i++) {
+            final ResolveInfo ri = allHomeCandidates.get(i);
+            if (ri.priority > lastPriority) {
+                lastComponent = ri.activityInfo.getComponentName();
+                lastPriority = ri.priority;
+            } else if (ri.priority == lastPriority) {
+                // Two components found with same priority.
+                lastComponent = null;
+            }
+        }
+        return lastComponent != null && packageName.equals(lastComponent.getPackageName());
+    }
 }