Android Question How to get another application's primary color?

Sub Activity_Create(FirstTime As Boolean)
   Dim jo As JavaObject
   jo.InitializeContext
   jo.RunMethod("test", Array("b4a.example"))
End Sub

#if Java
import android.content.ComponentName;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.Resources.Theme;
import android.graphics.Color;
   public void test(String packageName) {
      try {
      final PackageManager pm = getPackageManager();

      // The package name of the app you want to receive resources from
      final String appPackageName = packageName;
      // Retrieve the Resources from the app
      final Resources res = pm.getResourcesForApplication(appPackageName);
      // Create the attribute set used to get the colorPrimary color
      final int[] attrs = new int[] {
      /** AppCompat attr */
      res.getIdentifier("colorPrimary", "attr", appPackageName),
      /** Framework attr */
      android.R.attr.colorPrimary
      };

      // Create a new Theme and apply the style from the launcher Activity
      final Theme theme = res.newTheme();
      final ComponentName cn = pm.getLaunchIntentForPackage(appPackageName).getComponent();
      theme.applyStyle(pm.getActivityInfo(cn, 0).theme, false);

      // Obtain the colorPrimary color from the attrs
      TypedArray a = theme.obtainStyledAttributes(attrs);
      // Do something with the color
      final int colorPrimary = a.getColor(0, a.getColor(1, Color.WHITE));
         BA.Log("colorPrimary: " + colorPrimary);
      // Make sure you recycle the TypedArray
      a.recycle();
      a = null;
      } catch (final NameNotFoundException e) {
      e.printStackTrace();
      }
   }
#End If