[Exposed-core]: fix NPE caused by can reorder.

Author: 维术

VirtualApp/app/src/main/java/io/virtualapp/VApp.java

@@ -30,7 +30,7 @@
  */
 public class VApp extends MultiDexApplication {
 
-    private static final String XPOSED_INSTALLER_PACKAGE = "de.robv.android.xposed.installer";
+    public static final String XPOSED_INSTALLER_PACKAGE = "de.robv.android.xposed.installer";
 
     private static VApp gApp;
     private SharedPreferences mPreferences;

VirtualApp/app/src/main/java/io/virtualapp/home/HomeActivity.java

@@ -432,7 +432,9 @@ public boolean canDropOver(RecyclerView recyclerView, RecyclerView.ViewHolder cu
             }
             try {
                 AppData data = mLaunchpadAdapter.getList().get(target.getAdapterPosition());
-                return data.canReorder();
+                if (data != null) {
+                    return data.canReorder();
+                }
             } catch (IndexOutOfBoundsException e) {
                 e.printStackTrace();
             }

VirtualApp/app/src/main/java/io/virtualapp/home/models/PackageAppData.java

@@ -7,6 +7,8 @@
 
 import com.lody.virtual.remote.InstalledAppInfo;
 
+import io.virtualapp.VApp;
+
 /**
  * @author Lody
  */
@@ -74,6 +76,9 @@ public String getName() {
 
     @Override
     public boolean canReorder() {
+        if (VApp.XPOSED_INSTALLER_PACKAGE.equals(packageName)) {
+            return false;
+        }
         return true;
     }