Fixing wrong check being used for application status

Earlier we were relying on activity list to check is an app is
installed or not. It fails if the app only exposes widgets and
no visible activity. Hence dragging an icon to AppInfo sometimes
causes the icon to get disappear.

Bug: 33241335
Change-Id: Ieb71e298a0930dd0a831cf09bd1e998514a427fd
diff --git a/src/com/android/launcher3/UninstallDropTarget.java b/src/com/android/launcher3/UninstallDropTarget.java
index e68a5b0..0fac29f 100644
--- a/src/com/android/launcher3/UninstallDropTarget.java
+++ b/src/com/android/launcher3/UninstallDropTarget.java
@@ -5,6 +5,7 @@
 import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.LauncherActivityInfo;
+import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.UserHandle;
@@ -139,9 +140,10 @@
             final Runnable checkIfUninstallWasSuccess = new Runnable() {
                 @Override
                 public void run() {
-                    String packageName = cn.getPackageName();
-                    boolean uninstallSuccessful = !AllAppsList.packageHasActivities(
-                            launcher, packageName, user);
+                    // We use MATCH_UNINSTALLED_PACKAGES as the app can be on SD card as well.
+                    boolean uninstallSuccessful = LauncherAppsCompat.getInstance(launcher)
+                            .getApplicationInfo(cn.getPackageName(),
+                                    PackageManager.MATCH_UNINSTALLED_PACKAGES, user) == null;
                     callback.onDragObjectRemoved(uninstallSuccessful);
                 }
             };