diff --git a/app/build.gradle b/app/build.gradle
index 409f8d7..be179a0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -15,7 +15,7 @@ android {
         targetSdk target_sdk
 
         versionCode 1
-        versionName '0.1.0'
+        versionName '0.1.0-alpha.01'
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables {
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 481bb43..e391cf1 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -18,4 +18,10 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
\ No newline at end of file
+#-renamesourcefileattribute SourceFile
+
+# Keep default constuctors of wiget classes
+-keepnames class com.zjutjh.ijh.widget.* extends androidx.glance.appwidget.GlanceAppWidget
+-keepclassmembers class com.zjutjh.ijh.widget.* extends androidx.glance.appwidget.GlanceAppWidget {
+    public <init>();
+}
\ No newline at end of file
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/MainActivity.kt b/app/src/main/kotlin/com/zjutjh/ijh/MainActivity.kt
index 1ccbd6a..6a9b048 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/MainActivity.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/MainActivity.kt
@@ -12,9 +12,12 @@ import androidx.core.view.WindowCompat
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
 import androidx.lifecycle.LifecycleOwner
+import androidx.work.WorkManager
 import com.zjutjh.ijh.ui.IJhApp
 import com.zjutjh.ijh.ui.theme.IJhTheme
 import com.zjutjh.ijh.util.ViewModelStoreMappingOwner
+import com.zjutjh.ijh.widget.ScheduleWidget
+import com.zjutjh.ijh.work.enqueueWidgetRefresh
 import dagger.hilt.android.AndroidEntryPoint
 
 @AndroidEntryPoint
@@ -60,6 +63,9 @@ class MainActivity : ComponentActivity() {
         // Make system bars inside the application's layout scope
         WindowCompat.setDecorFitsSystemWindows(window, false)
 
+        // Update widget
+        WorkManager.getInstance(this).enqueueWidgetRefresh<ScheduleWidget>()
+
         setContent {
             IJhTheme {
                 IJhApp(
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidget.kt b/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidget.kt
index 68e61cb..a418f84 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidget.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidget.kt
@@ -178,8 +178,6 @@ class ScheduleWidget : GlanceAppWidget() {
                                 }
                             }
                         }
-                    } else {
-                        GText(context.getString(R.string.loading))
                     }
                 }
             }
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidgetReceiver.kt b/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidgetReceiver.kt
index 773c694..09b4133 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidgetReceiver.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/widget/ScheduleWidgetReceiver.kt
@@ -10,6 +10,7 @@ import androidx.work.WorkManager
 import com.zjutjh.ijh.data.repository.CourseRepository
 import com.zjutjh.ijh.data.repository.WeJhInfoRepository
 import com.zjutjh.ijh.work.ScheduleWidgetUpdater
+import com.zjutjh.ijh.work.enqueueWidgetRefresh
 import dagger.hilt.EntryPoint
 import dagger.hilt.InstallIn
 import dagger.hilt.components.SingletonComponent
@@ -31,7 +32,6 @@ class ScheduleWidgetReceiver : GlanceAppWidgetReceiver() {
 
     override fun onEnabled(context: Context) {
         super.onEnabled(context)
-
         // Enter relevant functionality for when the first widget is created
         val manager = WorkManager.getInstance(context)
         val request = PeriodicWorkRequestBuilder<ScheduleWidgetUpdater>(
@@ -46,6 +46,8 @@ class ScheduleWidgetReceiver : GlanceAppWidgetReceiver() {
             request
         )
 
+        manager.enqueueWidgetRefresh<ScheduleWidget>()
+
         Log.i("ScheduleWidget", "Updater enqueued.")
     }
 
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/work/ScheduleWidgetUpdater.kt b/app/src/main/kotlin/com/zjutjh/ijh/work/ScheduleWidgetUpdater.kt
index a4dc95a..0f6ef55 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/work/ScheduleWidgetUpdater.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/work/ScheduleWidgetUpdater.kt
@@ -12,6 +12,11 @@ import com.zjutjh.ijh.widget.ScheduleWidget
 import com.zjutjh.ijh.widget.ScheduleWidgetReceiver
 import dagger.hilt.android.EntryPointAccessors
 
+/**
+ * Worker that syncs data and updates widgets.
+ *
+ * **Note** On some devices, periodic update will work only when auto launch is enabled.
+ */
 class ScheduleWidgetUpdater(
     private val context: Context,
     workerParameters: WorkerParameters
diff --git a/app/src/main/kotlin/com/zjutjh/ijh/work/WidgetRefreshWorker.kt b/app/src/main/kotlin/com/zjutjh/ijh/work/WidgetRefreshWorker.kt
index a2011ae..8b6cdcb 100644
--- a/app/src/main/kotlin/com/zjutjh/ijh/work/WidgetRefreshWorker.kt
+++ b/app/src/main/kotlin/com/zjutjh/ijh/work/WidgetRefreshWorker.kt
@@ -7,11 +7,14 @@ import androidx.glance.appwidget.updateAll
 import androidx.work.Constraints
 import androidx.work.CoroutineWorker
 import androidx.work.ExistingPeriodicWorkPolicy
+import androidx.work.ExistingWorkPolicy
+import androidx.work.OneTimeWorkRequestBuilder
 import androidx.work.PeriodicWorkRequestBuilder
 import androidx.work.WorkManager
 import androidx.work.WorkerParameters
 import androidx.work.workDataOf
 import java.time.Duration
+import java.util.concurrent.TimeUnit
 
 /**
  * This worker is used to refresh the widget periodically.
@@ -27,33 +30,6 @@ class WidgetRefreshWorker(
         inline fun <reified T : GlanceAppWidget> getUniqueWorkName() =
             WidgetRefreshWorker::class.java.simpleName + "_" + T::class.java.simpleName
 
-        /**
-         * Enqueue a [WidgetRefreshWorker] for the given [GlanceAppWidget].
-         * Do nothing if the worker is already enqueued.
-         * Default refresh interval is 15 minutes.
-         */
-        inline fun <reified T : GlanceAppWidget> enqueue(context: Context) {
-            val manager = WorkManager.getInstance(context)
-            val request = PeriodicWorkRequestBuilder<WidgetRefreshWorker>(
-                Duration.ofMinutes(15), Duration.ofMinutes(5)
-            ).setConstraints(
-                Constraints(requiresBatteryNotLow = true)
-            ).setInputData(
-                workDataOf(INPUT_CLASS_NAME to T::class.java.name)
-            )
-                .build()
-
-            manager.enqueueUniquePeriodicWork(
-                getUniqueWorkName<T>(),
-                ExistingPeriodicWorkPolicy.KEEP,
-                request
-            )
-        }
-
-        inline fun <reified T : GlanceAppWidget> cancel(context: Context) {
-            val manager = WorkManager.getInstance(context)
-            manager.cancelUniqueWork(getUniqueWorkName<T>())
-        }
     }
 
     /**
@@ -78,5 +54,43 @@ class WidgetRefreshWorker(
             Result.failure()
         }
     }
+}
+
+inline fun <reified T : GlanceAppWidget> WorkManager.enqueueWidgetRefresh(force: Boolean = false) {
+    enqueueUniqueWork(
+        WidgetRefreshWorker.getUniqueWorkName<T>(),
+        if (force) ExistingWorkPolicy.REPLACE else ExistingWorkPolicy.KEEP,
+        OneTimeWorkRequestBuilder<WidgetRefreshWorker>()
+            .setInitialDelay(1, TimeUnit.SECONDS)
+            .setInputData(
+                workDataOf(WidgetRefreshWorker.INPUT_CLASS_NAME to T::class.java.name)
+            )
+            .build()
+    )
+}
+
+/**
+ * Enqueue a [WidgetRefreshWorker] for the given [GlanceAppWidget].
+ * Do nothing if the worker is already enqueued.
+ * Default refresh interval is 15 minutes.
+ */
+inline fun <reified T : GlanceAppWidget> WorkManager.enqueuePeriodicWidgetRefresh() {
+    val request = PeriodicWorkRequestBuilder<WidgetRefreshWorker>(
+        Duration.ofMinutes(15), Duration.ofMinutes(5)
+    ).setConstraints(
+        Constraints(requiresBatteryNotLow = true)
+    ).setInputData(
+        workDataOf(WidgetRefreshWorker.INPUT_CLASS_NAME to T::class.java.name)
+    )
+        .build()
+
+    enqueueUniquePeriodicWork(
+        WidgetRefreshWorker.getUniqueWorkName<T>(),
+        ExistingPeriodicWorkPolicy.KEEP,
+        request
+    )
+}
 
+inline fun <reified T : GlanceAppWidget> WorkManager.cancelPeriodicWidgetRefresh() {
+    cancelUniqueWork(WidgetRefreshWorker.getUniqueWorkName<T>())
 }
\ No newline at end of file
diff --git a/app/src/main/res/drawable/baseline_autorenew_24.xml b/app/src/main/res/drawable/baseline_autorenew_24.xml
index 1f497e9..60e8594 100644
--- a/app/src/main/res/drawable/baseline_autorenew_24.xml
+++ b/app/src/main/res/drawable/baseline_autorenew_24.xml
@@ -1,7 +1,6 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"
-    android:tint="#000000"
     android:viewportWidth="24"
     android:viewportHeight="24">
     <path
diff --git a/app/src/main/res/layout/widget_loading.xml b/app/src/main/res/layout/widget_loading.xml
deleted file mode 100644
index aad928f..0000000
--- a/app/src/main/res/layout/widget_loading.xml
+++ /dev/null
@@ -1,11 +0,0 @@
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    style="@style/Widget.IJH.AppWidget.Container"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:theme="@style/Theme.IJh.AppWidgetContainer">
-
-    <ProgressBar
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="center" />
-</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/widget_schedule_layout.xml b/app/src/main/res/layout/widget_schedule_layout.xml
new file mode 100644
index 0000000..09f3b28
--- /dev/null
+++ b/app/src/main/res/layout/widget_schedule_layout.xml
@@ -0,0 +1,62 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@android:id/background"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="?attr/colorSurface"
+    android:orientation="vertical"
+    android:theme="@style/Theme.IJh.AppWidgetContainer">
+
+    <LinearLayout
+        android:id="@+id/constraintLayout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="8dp">
+
+        <TextView
+            android:id="@+id/textView"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical"
+            android:layout_marginStart="16dp"
+            android:layout_weight="1"
+            android:text="@string/schedule"
+            android:textSize="20sp"
+            android:textStyle="bold" />
+
+        <ImageView
+            android:layout_width="20dp"
+            android:layout_height="20dp"
+            android:layout_gravity="center_vertical"
+            android:layout_marginEnd="16dp"
+            android:foregroundTint="?attr/colorOnBackground"
+            android:src="@drawable/baseline_autorenew_24"
+            app:tint="?attr/colorOnBackground" />
+    </LinearLayout>
+
+    <FrameLayout
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:layout_margin="5dp"
+        android:background="?attr/colorOutline" />
+
+
+    <!--    <FrameLayout-->
+    <!--        android:layout_width="match_parent"-->
+    <!--        android:layout_height="50dp"-->
+    <!--        android:layout_margin="10dp"-->
+    <!--        android:background="?attr/colorPrimaryContainer" />-->
+
+    <!--    <FrameLayout-->
+    <!--        android:layout_width="match_parent"-->
+    <!--        android:layout_height="50dp"-->
+    <!--        android:layout_margin="10dp"-->
+    <!--        android:background="?attr/colorSecondaryContainer" />-->
+
+    <!--    <FrameLayout-->
+    <!--        android:layout_width="match_parent"-->
+    <!--        android:layout_height="50dp"-->
+    <!--        android:layout_margin="10dp"-->
+    <!--        android:background="?attr/colorSecondaryContainer" />-->
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/xml/app_widget_schedule.xml b/app/src/main/res/xml/app_widget_schedule.xml
index 51191a0..4db57f2 100644
--- a/app/src/main/res/xml/app_widget_schedule.xml
+++ b/app/src/main/res/xml/app_widget_schedule.xml
@@ -2,13 +2,13 @@
 <appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:description="@string/app_widget_schedule_description"
-    android:initialKeyguardLayout="@layout/widget_loading"
-    android:initialLayout="@layout/widget_loading"
+    android:initialKeyguardLayout="@layout/widget_schedule_layout"
+    android:initialLayout="@layout/widget_schedule_layout"
     android:minWidth="200dp"
     android:minHeight="160dp"
     android:minResizeWidth="200dp"
     android:minResizeHeight="160dp"
-    android:previewLayout="@layout/widget_loading"
+    android:previewLayout="@layout/widget_schedule_layout"
     android:resizeMode="horizontal|vertical"
     android:targetCellWidth="3"
     android:targetCellHeight="3"