code: private static void convertActivityToTranslucentAfterL(Activity activity) {
          try {
              Method getActivityOptions = Activity.class.getDeclaredMethod("getActivityOptions");
              getActivityOptions.setAccessible(true);
              Object options = getActivityOptions.invoke(activity);
  
              Class<?>[] classes = Activity.class.getDeclaredClasses();
              Class<?> translucentConversionListenerClazz = null;
              for (Class clazz : classes) {
                  if (clazz.getSimpleName().contains("TranslucentConversionListener")) {
                      translucentConversionListenerClazz = clazz;
                  }
              }
              Method convertToTranslucent = Activity.class.getDeclaredMethod("convertToTranslucent",
                      translucentConversionListenerClazz, ActivityOptions.class);
              convertToTranslucent.setAccessible(true);
              convertToTranslucent.invoke(activity, null, options);
          } catch (Throwable t) {
          }
      }
docs: Calling the convertToTranslucent method on platforms after Android 5.0