如何在Android Oreo系统中检测应用通知的Allow notification dot状态？

Hey there! I know hunting for a way to check if notification dots are enabled on Android Oreo can feel like a wild goose chase—let me walk you through the proven methods to get this sorted.

1. Check if the system allows your app to show notification dots #

Android 8.0 (API 26) added a dedicated AppOps permission for controlling notification badges. You can use the AppOpsManager to check the system-level setting for your app:

import android.app.AppOpsManager;
import android.content.Context;
import android.os.Process;

public boolean isNotificationDotAllowed(Context context) {
    AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
    if (appOps == null) {
        return false;
    }
    // Check the status of the notification badge permission
    int mode = appOps.checkOpNoThrow(
            AppOpsManager.OP_NOTIFICATION_BADGE,
            Process.myUid(),
            context.getPackageName()
    );
    return mode == AppOpsManager.MODE_ALLOWED;
}

2. Check if a specific notification channel enables badges #

Since Oreo ties notification behavior to channels, you might also need to verify if a specific channel has badges enabled. Here's how to check that:

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Build;

public boolean isChannelBadgeEnabled(Context context, String channelId) {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
        return false; // This doesn't apply to versions before Oreo
    }
    NotificationManager notificationManager = 
            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    if (notificationManager == null) {
        return false;
    }
    NotificationChannel channel = notificationManager.getNotificationChannel(channelId);
    // canShowBadge() returns true only if both the channel's setting and system allow it
    return channel != null && channel.canShowBadge();
}

Key Notes to Remember #

• Notification Permission is a Prerequisite: Before checking badge status, always confirm your app has notification permissions enabled. Use NotificationManagerCompat.areNotificationsEnabled(context) to verify this—if notifications are disabled, badges won't work no matter what other settings are in place.
• User Control: Keep in mind users can toggle badge settings both globally (for your entire app) and per-channel in system settings, so these checks will reflect the current user-configured state.

内容的提问来源于stack exchange，提问作者sonida