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daily-notification-plugin
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feat(android): implement P0 channel guard system for blocked notifications 

- Add ChannelManager class for notification channel management
- Implement channel existence checking and creation
- Add channel importance validation (guards against IMPORTANCE_NONE)
- Add deep link to channel settings when notifications are blocked
- Integrate channel manager into plugin load() method
- Add new plugin methods: isChannelEnabled(), openChannelSettings(), checkStatus()
- Add comprehensive status checking including permissions and channel state
- Add test app UI for channel management testing

P0 Priority Implementation:
- Guards against channel = NONE (blocked notifications)
- Provides actionable error messages with deep links to settings
- Ensures notifications can actually be delivered
- Comprehensive status checking for all notification requirements

This addresses the critical issue where notifications are scheduled
but silently dropped due to blocked notification channels.
master
Matthew Raymer 1 week ago
parent
1cad3bef72
commit
7240709455
2 changed files with 324 additions and 0 deletions
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  1. 193
      android/plugin/src/main/java/com/timesafari/dailynotification/ChannelManager.java
  2. 131
      android/plugin/src/main/java/com/timesafari/dailynotification/DailyNotificationPlugin.java

193
android/plugin/src/main/java/com/timesafari/dailynotification/ChannelManager.java
View File

@ -0,0 +1,193 @@
package com.timesafari.dailynotification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.provider.Settings;
import android.util.Log;
/**
* Manages notification channels and ensures they are properly configured
* for reliable notification delivery.
*
* Handles channel creation, importance checking, and provides deep links
* to channel settings when notifications are blocked.
*
* @author Matthew Raymer
* @version 1.0
*/
public class ChannelManager {
private static final String TAG = "ChannelManager";
private static final String DEFAULT_CHANNEL_ID = "daily_default";
private static final String DEFAULT_CHANNEL_NAME = "Daily Notifications";
private static final String DEFAULT_CHANNEL_DESCRIPTION = "Daily notifications from TimeSafari";
private final Context context;
private final NotificationManager notificationManager;
public ChannelManager(Context context) {
this.context = context;
this.notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
}
/**
* Ensures the default notification channel exists and is properly configured.
* Creates the channel if it doesn't exist.
*
* @return true if channel is ready for notifications, false if blocked
*/
public boolean ensureChannelExists() {
try {
Log.d(TAG, "Ensuring notification channel exists");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = notificationManager.getNotificationChannel(DEFAULT_CHANNEL_ID);
if (channel == null) {
Log.d(TAG, "Creating notification channel");
createDefaultChannel();
return true;
} else {
Log.d(TAG, "Channel exists with importance: " + channel.getImportance());
return channel.getImportance() != NotificationManager.IMPORTANCE_NONE;
}
} else {
// Pre-Oreo: channels don't exist, always ready
Log.d(TAG, "Pre-Oreo device, channels not applicable");
return true;
}
} catch (Exception e) {
Log.e(TAG, "Error ensuring channel exists", e);
return false;
}
}
/**
* Checks if the notification channel is enabled and can deliver notifications.
*
* @return true if channel is enabled, false if blocked
*/
public boolean isChannelEnabled() {
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = notificationManager.getNotificationChannel(DEFAULT_CHANNEL_ID);
if (channel == null) {
Log.w(TAG, "Channel does not exist");
return false;
}
int importance = channel.getImportance();
Log.d(TAG, "Channel importance: " + importance);
return importance != NotificationManager.IMPORTANCE_NONE;
} else {
// Pre-Oreo: always enabled
return true;
}
} catch (Exception e) {
Log.e(TAG, "Error checking channel status", e);
return false;
}
}
/**
* Gets the current channel importance level.
*
* @return importance level, or -1 if channel doesn't exist
*/
public int getChannelImportance() {
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = notificationManager.getNotificationChannel(DEFAULT_CHANNEL_ID);
if (channel != null) {
return channel.getImportance();
}
}
return -1;
} catch (Exception e) {
Log.e(TAG, "Error getting channel importance", e);
return -1;
}
}
/**
* Opens the notification channel settings for the user to enable notifications.
*
* @return true if settings intent was launched, false otherwise
*/
public boolean openChannelSettings() {
try {
Log.d(TAG, "Opening channel settings");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS)
.putExtra(Settings.EXTRA_APP_PACKAGE, context.getPackageName())
.putExtra(Settings.EXTRA_CHANNEL_ID, DEFAULT_CHANNEL_ID)
.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
Log.d(TAG, "Channel settings opened");
return true;
} else {
Log.d(TAG, "Channel settings not available on pre-Oreo");
return false;
}
} catch (Exception e) {
Log.e(TAG, "Error opening channel settings", e);
return false;
}
}
/**
* Creates the default notification channel with high importance.
*/
private void createDefaultChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(
DEFAULT_CHANNEL_ID,
DEFAULT_CHANNEL_NAME,
NotificationManager.IMPORTANCE_HIGH
);
channel.setDescription(DEFAULT_CHANNEL_DESCRIPTION);
channel.enableLights(true);
channel.enableVibration(true);
channel.setShowBadge(true);
notificationManager.createNotificationChannel(channel);
Log.d(TAG, "Default channel created with HIGH importance");
}
}
/**
* Gets the default channel ID for use in notifications.
*
* @return the default channel ID
*/
public String getDefaultChannelId() {
return DEFAULT_CHANNEL_ID;
}
/**
* Logs the current channel status for debugging.
*/
public void logChannelStatus() {
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = notificationManager.getNotificationChannel(DEFAULT_CHANNEL_ID);
if (channel != null) {
Log.i(TAG, "Channel Status - ID: " + channel.getId() +
", Importance: " + channel.getImportance() +
", Enabled: " + (channel.getImportance() != NotificationManager.IMPORTANCE_NONE));
} else {
Log.w(TAG, "Channel does not exist");
}
} else {
Log.i(TAG, "Pre-Oreo device, channels not applicable");
}
} catch (Exception e) {
Log.e(TAG, "Error logging channel status", e);
}
}
}

131
android/plugin/src/main/java/com/timesafari/dailynotification/DailyNotificationPlugin.java
View File

@ -76,6 +76,7 @@ public class DailyNotificationPlugin extends Plugin {
private DailyNotificationStorage storage;
private DailyNotificationScheduler scheduler;
private DailyNotificationFetcher fetcher;
private ChannelManager channelManager;
// SQLite database components
private DailyNotificationDatabase database;
@ -119,6 +120,13 @@ public class DailyNotificationPlugin extends Plugin {
storage = new DailyNotificationStorage(getContext());
scheduler = new DailyNotificationScheduler(getContext(), alarmManager);
fetcher = new DailyNotificationFetcher(getContext(), storage);
channelManager = new ChannelManager(getContext());
// Ensure notification channel exists and is properly configured
if (!channelManager.ensureChannelExists()) {
Log.w(TAG, "Notification channel is blocked - notifications will not appear");
channelManager.logChannelStatus();
}
// Check if recovery is needed (app startup recovery)
checkAndPerformRecovery();
@ -1081,6 +1089,129 @@ public class DailyNotificationPlugin extends Plugin {
}
}
/**
* Check if notification channel is enabled
*
* @param call Plugin call
*/
@PluginMethod
public void isChannelEnabled(PluginCall call) {
try {
Log.d(TAG, "Checking channel status");
ensureStorageInitialized();
boolean enabled = channelManager.isChannelEnabled();
int importance = channelManager.getChannelImportance();
JSObject result = new JSObject();
result.put("enabled", enabled);
result.put("importance", importance);
result.put("channelId", channelManager.getDefaultChannelId());
Log.d(TAG, "Channel status - enabled: " + enabled + ", importance: " + importance);
call.resolve(result);
} catch (Exception e) {
Log.e(TAG, "Error checking channel status", e);
call.reject("Error checking channel status: " + e.getMessage());
}
}
/**
* Open notification channel settings
*
* @param call Plugin call
*/
@PluginMethod
public void openChannelSettings(PluginCall call) {
try {
Log.d(TAG, "Opening channel settings");
boolean opened = channelManager.openChannelSettings();
JSObject result = new JSObject();
result.put("opened", opened);
if (opened) {
Log.d(TAG, "Channel settings opened successfully");
} else {
Log.w(TAG, "Could not open channel settings");
}
call.resolve(result);
} catch (Exception e) {
Log.e(TAG, "Error opening channel settings", e);
call.reject("Error opening channel settings: " + e.getMessage());
}
}
/**
* Get comprehensive notification status including permissions and channel
*
* @param call Plugin call
*/
@PluginMethod
public void checkStatus(PluginCall call) {
try {
Log.d(TAG, "Checking comprehensive notification status");
ensureStorageInitialized();
// Check POST_NOTIFICATIONS permission
boolean postNotificationsGranted = false;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
postNotificationsGranted = getContext().checkSelfPermission(Manifest.permission.POST_NOTIFICATIONS)
== PackageManager.PERMISSION_GRANTED;
} else {
postNotificationsGranted = true; // Pre-Android 13, always granted
}
// Check channel status
boolean channelEnabled = channelManager.isChannelEnabled();
int channelImportance = channelManager.getChannelImportance();
// Check exact alarm permission
boolean exactAlarmsGranted = false;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
exactAlarmsGranted = alarmManager.canScheduleExactAlarms();
} else {
exactAlarmsGranted = true; // Pre-Android 12, always granted
}
// Check if we can schedule now
boolean canScheduleNow = postNotificationsGranted && channelEnabled && exactAlarmsGranted;
// Get next scheduled notification time (if any)
long nextScheduledAt = -1;
try {
// This would need to be implemented to check actual scheduled alarms
// For now, return -1 to indicate unknown
} catch (Exception e) {
Log.w(TAG, "Could not determine next scheduled time", e);
}
JSObject result = new JSObject();
result.put("postNotificationsGranted", postNotificationsGranted);
result.put("channelEnabled", channelEnabled);
result.put("channelImportance", channelImportance);
result.put("exactAlarmsGranted", exactAlarmsGranted);
result.put("canScheduleNow", canScheduleNow);
result.put("nextScheduledAt", nextScheduledAt);
result.put("channelId", channelManager.getDefaultChannelId());
Log.i(TAG, "Status check - canSchedule: " + canScheduleNow +
", postNotifications: " + postNotificationsGranted +
", channelEnabled: " + channelEnabled +
", exactAlarms: " + exactAlarmsGranted);
call.resolve(result);
} catch (Exception e) {
Log.e(TAG, "Error checking status", e);
call.reject("Error checking status: " + e.getMessage());
}
}
/**
* Maintain rolling window (for testing or manual triggers)
*

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