TriggerX is a modular, developer-friendly alarm execution library for Android.
It simplifies scheduling exact alarms and showing user-facing UIs at a specific time, even when your app has been killed or without you managing foreground-service boilerplate, wake-locks, or lock-screen flags.
| ⏰ Exact alarms that work in Doze (API 25+) | 🔓 Lock-screen activity automatically shown when the alarm fires |
| 🔑 Handles permissions: exact alarm, battery optimisations, overlay, notification | 📱 Wakes the device, starts a foreground service, then stops it |
🔄 Fetches fresh data at alarm time via suspend provider (Room, API, …) |
🎨 Lets you build the UI in Jetpack Compose |
Think of TriggerX as an execution layer that runs a piece of UI logic at the right time and hides the system details.
| 📅 You need to show a UI (reminder, alert, action screen) at a given time | 🔄 The UI needs live data from DB, cache, or API |
| 🧹 You want to avoid edge-case handling for Doze, foreground services, or flags | 🎯 You want a consistent alarm solution across Android versions |
Version catalogs
[versions]
triggerx = "latest-version"
[dependencies]
triggerx = { module = "com.meticha:triggerx", version.ref = "triggerx" }Gradle DSL
dependencies {
implementation("com.meticha:triggerx:latest-version")
}<uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
<!-- Permissions for scheduling exact alarms -->
<uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
TriggerX.init(this) {
/* UI that opens when the alarm fires */
activityClass = MyAlarmActivity::class.java
/* Foreground-service notification */
useDefaultNotification(
title = "Alarm running",
message = "Tap to open",
channelName = "Alarm Notifications"
)
/* Optional: Provide up-to-date data right before the UI opens */
alarmDataProvider = object : TriggerXDataProvider {
override suspend fun provideData(alarmId: Int, alarmType: String): Bundle {
return when (alarmType) {
"MEETING" -> {
val meeting = meetingRepository.getMeeting(alarmId)
return bundleOf(
"title" to meeting?.title,
"location" to meeting?.location
)
}
else -> bundleOf()
}
}
}
}
}
}The library provides a composable helper to request permissions so that you don't have to manage this manually. However, the library provides the functionality to request permissions manually if you want to follow that path
@Composable
fun HomeScreen(
viewModel: HomeViewModel = hiltViewModel()
) {
val context = LocalContext.current
val permissionState = rememberAppPermissionState()
val coroutines = rememberCoroutineScope()
Scaffold { paddingValues ->
Column(
modifier = Modifier
.fillMaxSize()
.padding(paddingValues)
.padding(16.dp),
verticalArrangement = Arrangement.Center,
horizontalAlignment = Alignment.CenterHorizontally
) {
ElevatedButton(
onClick = {
coroutines.launch {
if (permissionState.allRequiredGranted()) {
viewModel.scheduleOneMinuteAlarm(context)
} else {
permissionState.requestPermission()
}
}
}
) {
Text("Schedule Activity")
}
}
}
}val inFiveMinutes = Calendar.getInstance().apply {
add(Calendar.MINUTE, 5)
}.timeInMillis
TriggerXAlarmScheduler().scheduleAlarm(
context = this,
alarmId = 1,
type = "MEETING",
triggerAtMillis = inFiveMinutes
)💡 You can schedule many alarms with different alarmId / alarmType.
class AppAlarmActivity : TriggerXActivity() {
@Composable
override fun AlarmContent() {
val bundle = remember { intent?.getBundleExtra("ALARM_DATA") }
val title = bundle?.getString("title") ?: "empty title"
val location = bundle?.getString("location")
Box(
modifier = Modifier.fillMaxSize()
) {
Column(
modifier = Modifier
.fillMaxSize()
.background(
color = Color.White,
shape = RoundedCornerShape(32.dp)
)
.padding(32.dp),
verticalArrangement = Arrangement.Center,
horizontalAlignment = Alignment.CenterHorizontally
) {
Icon(
imageVector = Icons.Default.Notifications,
contentDescription = "Trigger Icon",
tint = Color(0xFF111111),
modifier = Modifier.size(80.dp)
)
Spacer(modifier = Modifier.height(24.dp))
Text(
text = title,
fontSize = 42.sp,
fontWeight = FontWeight.Bold,
color = Color(0xFF111111)
)
Spacer(modifier = Modifier.height(12.dp))
Text(
text = location ?: "empty location",
fontSize = 20.sp,
fontWeight = FontWeight.Medium,
color = Color(0xFF333333),
textAlign = TextAlign.Center
)
}
}
}
}What the base class handles for you:
- 🔓 Shows over lock-screen
- 📱 Turns screen on
- ⚙️ Chooses correct flags per Android version
- 📦 Receives & parses Bundle (“ALARM_DATA”)
TriggerX includes a Composable helper to request what it needs.
@Composable
fun HomeScreen(
viewModel: HomeViewModel = hiltViewModel()
) {
val context = LocalContext.current
val permissionState = rememberAppPermissionState()
val coroutines = rememberCoroutineScope()
Scaffold { paddingValues ->
Column(
modifier = Modifier
.fillMaxSize()
.padding(paddingValues)
.padding(16.dp),
verticalArrangement = Arrangement.Center,
horizontalAlignment = Alignment.CenterHorizontally
) {
ElevatedButton(
onClick = {
coroutines.launch {
if (permissionState.allRequiredGranted()) {
viewModel.scheduleOneMinuteAlarm(
context
)
} else {
permissionState.requestPermission()
}
}
}
) {
Text("Schedule Activity")
}
}
}
}Covered automatically:
| Permission | Version |
|---|---|
| ⏰ Exact alarm | API 31+ |
| 🔋 Ignore battery optimisation | all |
| 🖼 Overlay (only if needed) | all |
| 📢 Post-notification | API 33+ |
- AlarmManager schedules an exact alarm
- BroadcastReceiver fires when alarm time arrives
- ForegroundService starts (Play-Store-compliant)
- Your AlarmDataProvider supplies fresh data (suspend)
- Service launches your activity with the data bundle
- ForegroundService stops; activity shows over lock-screen
interface TriggerXDataProvider {
/**
* Fetch or build data for a specific alarm.
* Called on a background dispatcher.
*/
suspend fun provideData(alarmId: Int, alarmType: String): Bundle
}Room example:
class RoomProvider(private val dao: MeetingDao) : TriggerXDataProvider {
override suspend fun provideData(id: Int, type: String) = when (type) {
"MEETING" -> dao.getMeeting(id)?.run {
bundleOf("title" to title, "location" to location)
} ?: Bundle.EMPTY
else -> Bundle.EMPTY
}
}class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
TriggerX.init(this) {
notificationTitle = "Reminder"
notificationMessage = "You have a scheduled event"
notificationChannelName = "Event Alarms"
customLogger = object : TriggerXLogger {
override fun d(message: String) = Log.d("TriggerX", message)
override fun e(message: String, throwable: Throwable?) =
Log.e("TriggerX", message, throwable)
}
}
}
}class ApiProvider(private val api: AlarmApi) : TriggerXDataProvider {
override suspend fun provideData(alarmId: Int, alarmType: String): Bundle {
return try {
val response = api.getAlarmDetails(alarmId)
bundleOf("title" to response.title, "description" to response.description)
} catch (e: Exception) {
Bundle.EMPTY
}
}
}class StaticProvider : TriggerXDataProvider {
override suspend fun provideData(alarmId: Int, alarmType: String): Bundle {
return when (alarmType) {
"WELCOME" -> bundleOf("title" to "Welcome!", "body" to "Thanks for installing our app.")
else -> Bundle.EMPTY
}
}
}class MultiSourceProvider(
private val roomProvider: TriggerXDataProvider,
private val networkProvider: TriggerXDataProvider
) : TriggerXDataProvider {
override suspend fun provideData(alarmId: Int, alarmType: String): Bundle {
return when (alarmType) {
"MEETING" -> roomProvider.provideData(alarmId, alarmType)
"NEWS" -> networkProvider.provideData(alarmId, alarmType)
else -> Bundle.EMPTY
}
}
}TriggerX stores minimal info (ID, type, activity class) in Preferences DataStore so alarms still work after the user swipes the app away.
TriggerXAlarmScheduler().cancelAlarm(this, alarmId = 1)| Issue | Check |
|---|---|
| Alarm doesn’t fire | Exact-alarm permission granted? |
| Activity not visible | Overlay / lock-screen flags? |
| Service killed early | Battery optimisation disabled? |
See CONTRIBUTING.MD for more info on how you can contribute to this repository
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Copyright 2025 Meticha
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