Improve Android Calendar Widget Logic

Author: jakobkoerber

android/app/src/main/kotlin/de/tum/in/tumcampus/widgets/calendar/CalendarWidget.kt

@@ -0,0 +1,92 @@
+package de.tum.`in`.tumcampus.widgets.calendar
+
+import android.appwidget.AppWidgetManager
+import android.content.Context
+import android.content.Intent
+import android.content.SharedPreferences
+import android.view.View
+import android.widget.RemoteViews
+import de.tum.`in`.tumcampus.MainActivity
+import de.tum.`in`.tumcampus.R
+import de.tum.`in`.tumcampus.util.DateTimeSerializer
+import de.tum.`in`.tumcampus.util.timeAgo
+import es.antonborri.home_widget.HomeWidgetLaunchIntent
+import es.antonborri.home_widget.HomeWidgetProvider
+import java.time.LocalDate
+import java.time.LocalDateTime
+import java.time.Period
+import java.time.format.DateTimeFormatter
+import java.time.format.FormatStyle
+import java.time.format.TextStyle
+import java.util.Locale
+import androidx.core.net.toUri
+
+class CalendarWidgetProvider : HomeWidgetProvider() {
+    override fun onUpdate(
+        context: Context,
+        appWidgetManager: AppWidgetManager,
+        appWidgetIds: IntArray,
+        widgetData: SharedPreferences
+    ) {
+        // There may be multiple widgets active, so update all of them
+        for (appWidgetId in appWidgetIds) {
+            updateAppWidget(context, appWidgetManager, appWidgetId, widgetData)
+        }
+    }
+
+    private fun updateAppWidget(
+        context: Context,
+        appWidgetManager: AppWidgetManager,
+        appWidgetId: Int,
+        widgetData: SharedPreferences
+    ) {
+        // Instantiate the RemoteViews object for the app widget layout.
+        val remoteViews = RemoteViews(context.packageName, R.layout.calendar_widget)
+
+        // Set formatted date in the header
+        val localDate = LocalDate.now()
+        val dateFormatter =
+            DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(Locale.getDefault())
+        val date = localDate.format(dateFormatter)
+        val weekday = localDate.dayOfWeek.getDisplayName(TextStyle.FULL, Locale.getDefault())
+        remoteViews.setTextViewText(R.id.calendar_widget_date, "$weekday, $date")
+
+        // Set last saved date in the header
+        val lastSaved = widgetData.getString("calendar_save", null)
+        val lastSavedDate = DateTimeSerializer.deserializeStringToDate(lastSaved)
+        val lastSavedDateString = (lastSavedDate ?: LocalDateTime.now()).timeAgo(context)
+        remoteViews.setTextViewText(R.id.calendar_widget_updated_on, lastSavedDateString)
+
+        if (lastSavedDate != null && Period.between(
+                LocalDate.now(),
+                lastSavedDate.toLocalDate(),
+            ).days < 14
+        ) {
+            // Set up the intent that starts the calendarWidgetService
+            val intent = Intent(context, CalendarWidgetService::class.java)
+            intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId)
+            intent.data = intent.toUri(Intent.URI_INTENT_SCHEME).toUri()
+            remoteViews.setRemoteAdapter(R.id.calendar_widget_listview, intent)
+
+            // The empty view is displayed when the collection has no items.
+            // It should be in the same layout used to instantiate the RemoteViews
+            // object above.
+            remoteViews.setEmptyView(R.id.calendar_widget_listview, R.id.empty_list_item)
+            remoteViews.setViewVisibility(R.id.old_data_item, View.INVISIBLE)
+        } else {
+            remoteViews.setViewVisibility(R.id.old_data_item, View.VISIBLE)
+            remoteViews.setViewVisibility(R.id.calendar_widget_listview, View.INVISIBLE)
+        }
+
+        val pendingIntentWithData = HomeWidgetLaunchIntent.getActivity(
+            context,
+            MainActivity::class.java,
+            "tumCampusApp://message?homeWidget=calendar".toUri()
+        )
+        remoteViews.setOnClickPendingIntent(R.id.calendar_widget, pendingIntentWithData)
+
+        // Instruct the widget manager to update the widget
+        appWidgetManager.updateAppWidget(appWidgetId, remoteViews)
+        appWidgetManager.notifyAppWidgetViewDataChanged(appWidgetId, R.id.calendar_widget_listview)
+    }
+}

android/app/src/main/kotlin/de/tum/in/tumcampus/widgets/calendar/CalendarWidgetProvider.kt

@@ -4,11 +4,16 @@ import android.content.Context
 import android.content.Intent
 import android.content.res.ColorStateList
 import android.os.Build
+import android.os.Bundle
 import android.widget.RemoteViews
 import android.widget.RemoteViewsService
+import androidx.core.net.toUri
+import de.tum.`in`.tumcampus.MainActivity
 import de.tum.`in`.tumcampus.util.DateTimeUtils
 import de.tum.`in`.tumcampus.R
 import de.tum.`in`.tumcampus.util.Const
+import es.antonborri.home_widget.HomeWidgetBackgroundIntent
+import es.antonborri.home_widget.HomeWidgetLaunchIntent
 import es.antonborri.home_widget.HomeWidgetPlugin
 import kotlinx.serialization.json.Json
 import java.time.LocalDateTime