add clock widget with dual-color time and next alarm

app/src/main/AndroidManifest.xml

@@ -35,5 +35,16 @@
                 android:name="android.appwidget.provider"
                 android:resource="@xml/agenda_widget_info" />
         </receiver>
+
+        <receiver
+            android:name=".widget.ClockWidgetReceiver"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+            </intent-filter>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/clock_widget_info" />
+        </receiver>
     </application>
 </manifest>

app/src/main/java/space/darkest/nova/android/widget/ClockWidget.kt

@@ -0,0 +1,156 @@
+package space.darkest.nova.android.widget
+
+import android.app.AlarmManager
+import android.content.Context
+import android.content.Intent
+import android.provider.AlarmClock
+import android.provider.Settings
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.glance.GlanceId
+import androidx.glance.GlanceModifier
+import androidx.glance.GlanceTheme
+import androidx.glance.action.clickable
+import androidx.glance.appwidget.GlanceAppWidget
+import androidx.glance.appwidget.GlanceAppWidgetReceiver
+import androidx.glance.appwidget.action.actionStartActivity
+import androidx.glance.appwidget.provideContent
+import androidx.glance.background
+import androidx.glance.color.DynamicThemeColorProviders
+import androidx.glance.layout.Alignment
+import androidx.glance.layout.Box
+import androidx.glance.layout.Column
+import androidx.glance.layout.Row
+import androidx.glance.layout.Spacer
+import androidx.glance.layout.fillMaxSize
+import androidx.glance.layout.height
+import androidx.glance.layout.padding
+import androidx.glance.layout.width
+import androidx.glance.text.FontWeight
+import androidx.glance.text.Text
+import androidx.glance.text.TextStyle
+import java.time.Instant
+import java.time.LocalDate
+import java.time.LocalTime
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
+import java.time.format.TextStyle as DateTextStyle
+import java.util.Locale
+
+class ClockWidget : GlanceAppWidget() {
+
+    override suspend fun provideGlance(context: Context, id: GlanceId) {
+        val alarmManager = context.getSystemService(AlarmManager::class.java)
+        val nextAlarm = alarmManager.nextAlarmClock?.let { alarm ->
+            Instant.ofEpochMilli(alarm.triggerTime)
+                .atZone(ZoneId.systemDefault())
+                .toLocalDateTime()
+        }
+
+        provideContent {
+            GlanceTheme(colors = DynamicThemeColorProviders) {
+                ClockContent(nextAlarm?.toLocalTime(), nextAlarm?.toLocalDate())
+            }
+        }
+    }
+
+    @Composable
+    private fun ClockContent(alarmTime: LocalTime?, alarmDate: LocalDate?) {
+        val now = LocalTime.now()
+        val today = LocalDate.now()
+        val hours = now.format(DateTimeFormatter.ofPattern("HH"))
+        val minutes = now.format(DateTimeFormatter.ofPattern("mm"))
+        val dateStr = today.let {
+            val day = it.dayOfWeek.getDisplayName(DateTextStyle.SHORT, Locale.getDefault())
+            val date = it.format(DateTimeFormatter.ofPattern("d MMM"))
+            "$day, $date"
+        }
+
+        Box(
+            modifier = GlanceModifier
+                .fillMaxSize()
+                .background(GlanceTheme.colors.widgetBackground)
+                .padding(16.dp)
+                .clickable(actionStartActivity(Intent(AlarmClock.ACTION_SHOW_ALARMS))),
+            contentAlignment = Alignment.CenterStart,
+        ) {
+            Column {
+                // time row: hours (primary) : minutes (tertiary)
+                Row(verticalAlignment = Alignment.Bottom) {
+                    Text(
+                        text = hours,
+                        style = TextStyle(
+                            color = GlanceTheme.colors.primary,
+                            fontSize = 48.sp,
+                            fontWeight = FontWeight.Bold,
+                        ),
+                    )
+                    Text(
+                        text = ":",
+                        style = TextStyle(
+                            color = GlanceTheme.colors.onSurfaceVariant,
+                            fontSize = 48.sp,
+                            fontWeight = FontWeight.Bold,
+                        ),
+                    )
+                    Text(
+                        text = minutes,
+                        style = TextStyle(
+                            color = GlanceTheme.colors.tertiary,
+                            fontSize = 48.sp,
+                            fontWeight = FontWeight.Bold,
+                        ),
+                    )
+                }
+
+                Spacer(GlanceModifier.height(2.dp))
+
+                // date
+                Text(
+                    text = dateStr,
+                    style = TextStyle(
+                        color = GlanceTheme.colors.onSurfaceVariant,
+                        fontSize = 14.sp,
+                    ),
+                )
+
+                // next alarm
+                if (alarmTime != null && alarmDate != null) {
+                    Spacer(GlanceModifier.height(4.dp))
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        Text(
+                            text = "\u23F0",
+                            style = TextStyle(fontSize = 12.sp),
+                        )
+                        Spacer(GlanceModifier.width(4.dp))
+                        Text(
+                            text = formatAlarm(alarmTime, alarmDate),
+                            style = TextStyle(
+                                color = GlanceTheme.colors.secondary,
+                                fontSize = 12.sp,
+                            ),
+                        )
+                    }
+                }
+            }
+        }
+    }
+
+    private fun formatAlarm(time: LocalTime, date: LocalDate): String {
+        val today = LocalDate.now()
+        val timeStr = time.format(DateTimeFormatter.ofPattern("HH:mm"))
+        return when (date) {
+            today -> timeStr
+            today.plusDays(1) -> "Tomorrow $timeStr"
+            else -> {
+                val dayName = date.dayOfWeek.getDisplayName(DateTextStyle.SHORT, Locale.getDefault())
+                "$dayName $timeStr"
+            }
+        }
+    }
+}
+
+class ClockWidgetReceiver : GlanceAppWidgetReceiver() {
+    override val glanceAppWidget: GlanceAppWidget = ClockWidget()
+}

app/src/main/res/values/strings.xml

@@ -1,5 +1,6 @@
 <resources>
     <string name="app_name">Nova Shell</string>
     <string name="widget_description">Calendar agenda showing upcoming events</string>
+    <string name="clock_widget_description">Clock with next alarm</string>
     <string name="widget_loading">Loading…</string>
 </resources>

app/src/main/res/xml/clock_widget_info.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
+    android:description="@string/clock_widget_description"
+    android:initialLayout="@layout/glance_default_loading_layout"
+    android:minWidth="180dp"
+    android:minHeight="110dp"
+    android:minResizeWidth="110dp"
+    android:minResizeHeight="80dp"
+    android:maxResizeWidth="530dp"
+    android:maxResizeHeight="200dp"
+    android:resizeMode="horizontal|vertical"
+    android:targetCellWidth="3"
+    android:targetCellHeight="2"
+    android:updatePeriodMillis="60000"
+    android:widgetCategory="home_screen" />