Basic Widget of an Android App

import android.appwidget.AppWidgetManager

import android.appwidget.AppWidgetProvider

import android.content.Context

import android.widget.RemoteViews

class NewAppWidget : AppWidgetProvider() {

override fun onUpdate(

context: Context,

appWidgetManager: AppWidgetManager,

appWidgetIds: IntArray

) {

// There may be multiple widgets 

 (appWidgetId in appWidgetIds) {

updateAppWidget(context, appWidgetManager, appWidgetId)}}

// when the first widget is created

override fun onEnabled(context: Context) {}

// when the last widget is disabled

override fun onDisabled(context: Context) {}

}

internal fun updateAppWidget(

context: Context,

appWidgetManager: AppWidgetManager,

appWidgetId: Int

) {

val widgetText = context.getString(R.string.appwidget_text)val views =           RemoteViews(context.packageName, R.layout.new_app_widget)

views.setTextViewText(R.id.appwidget_text, widgetText)

appWidgetManager.updateAppWidget(appWidgetId, views)

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

style="@style/Widget.MyApplication.AppWidget.Container"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:theme="@style/Theme.MyApplication.AppWidgetContainer">

<TextView

android:id="@+id/appwidget_text"

style="@style/Widget.MyApplication.AppWidget.InnerView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_centerVertical="true"

android:layout_margin="8dp"

android:contentDescription="@string/appwidget_text"

android:text="@string/appwidget_text"

android:textSize="24sp"

android:textStyle="bold|italic" />

</RelativeLayout>