The function WebView.getSettings().setPluginsEnabled();
method has been deprecated since API level 9, and was removed in API level 18. You can use the newer function WebView.getSettings().setPluginState(WebSettings.PluginState.ON);
which was added in API level 8 and was deprecated in API level 18. According to the WebSettings Documentation API levels beyond 18 will not support plugins; I’m assuming is because the main plugin to support was flash which adobe is no longer developing for mobile.