如何移除通知计时器、“Now”标识及下拉箭头并解决自动展开问题

Hey there, let's work through these notification quirks together—they're super common when dealing with custom RemoteViews, so I’ve got some practical fixes for you!

1. Fixing Auto-Expansion & Unresponsive Height Settings #

Android enforces certain minimum height rules for notifications, and it can override your layout dimensions if you don’t explicitly lock in the custom view behavior. Here’s what to do:

• Skip the expanded layout entirely: Since you want a single layout, don’t define or set a notificationLayoutExpanded—this tells the system there’s no expanded state to fall back to.
• Use the right style & lock the content view: Instead of relying on default styles, use NotificationCompat.DecoratedCustomViewStyle (or CustomViewStyle if you want no system decor) and explicitly set only your small custom view. Also, avoid high priority levels, as they can force expansion on some devices.
• Adjust your layout’s root view: Make sure your notification_small.xml root uses wrap_content or your desired fixed height (64dp/50dp) instead of match_parent—the system will respect this if you’ve set up the builder correctly.

Here’s the adjusted builder code snippet:

// Your existing RemoteViews setup
RemoteViews notificationLayout = new RemoteViews(getPackageName(), R.layout.notification_small);

// Build the notification correctly
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, YOUR_CHANNEL_ID)
        .setSmallIcon(R.drawable.your_mandatory_small_icon) // Never skip this!
        .setStyle(new NotificationCompat.DecoratedCustomViewStyle())
        .setCustomContentView(notificationLayout)
        // No setCustomBigContentView—we don't want expansion
        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
        .setCategory(NotificationCompat.CATEGORY_STATUS); // Helps system handle the notification properly

2. Removing Timer, "Now" Text & Dropdown Arrow #

These are all system-generated decor elements, and you can strip them out by switching to a full custom view style and disabling timestamp/chronometer:

• Use CustomViewStyle: This replaces the entire system notification template with your layout, so no default arrows or timestamps will show up.
• Disable timestamp and chronometer: Explicitly turn off these features in the builder to make sure they don’t sneak in.

Updated builder code for this part:

NotificationCompat.Builder builder = new NotificationCompat.Builder(this, YOUR_CHANNEL_ID)
        .setSmallIcon(R.drawable.your_mandatory_small_icon)
        .setStyle(new NotificationCompat.CustomViewStyle()) // No system decor
        .setCustomContentView(notificationLayout)
        .setShowWhen(false) // Removes the "Now" timestamp
        .setShowChronometer(false) // Removes any embedded timer
        .setPriority(NotificationCompat.PRIORITY_DEFAULT);

A quick note: The small icon is required for all Android notifications, so don’t omit it—even with a full custom layout, the system will throw an error if it’s missing.

If you’re still seeing issues, try testing on different API levels (Android 10+ has stricter notification rules) and clear your app’s cache to ensure old notification settings aren’t sticking around.

内容的提问来源于stack exchange，提问作者Gouse Mohiddin