Android 6.0.1用户Toast.makeText()无显示问题排查求助

Hey there, let's break down why your Android 6.0.1 user isn't seeing those Toast messages—this is actually a pretty common issue with that specific version, especially when dealing with custom ROMs. Here are the most likely causes and fixes:

• Custom ROM System Restrictions
  Android 6.0.1 was a popular base for OEM custom ROMs (like MIUI 7/8, EMUI 4.x, etc.), and many manufacturers added strict controls over popups and Toast notifications in this version. Users might have accidentally enabled a setting that blocks your app's Toasts, or the ROM might restrict Toasts for apps running in the background by default. Ask the user to check:

  Settings → Apps → [Your App Name] → Permissions/Notification Settings
  Look for options like "Block pop-ups" or "Restrict background notifications" and ensure they're disabled for your app.

• Custom Toast vs. System Toast Permissions
  If your app uses a custom Toast (built with WindowManager instead of the default Toast.makeText()), Android 6.0 introduced the SYSTEM_ALERT_WINDOW permission, which is required for floating views like custom Toasts. Unlike other runtime permissions, this one isn't requested via code—users have to enable it manually in:

  Settings → Apps → [Your App Name] → Advanced → Draw over other apps
  If you're using custom Toasts, this is almost certainly the issue for 6.0.1 users.

• Target SDK Version Compatibility
  If your app's targetSdkVersion is set to 23 (Android 6.0) or higher, some edge cases in Toast handling might trigger silent failures on 6.0.1. For example, if you're calling Toast.show() from a non-UI thread without switching to the main thread, the system might suppress the Toast instead of throwing an error (though this should happen on all versions, some 6.0.1 ROMs handle it differently). Double-check that all Toast calls are executed on the main thread using runOnUiThread() or a Handler.

• System Toast Service Glitch
  Occasionally, the system's Toast service (tied to the NotificationManagerService) can crash or get stuck due to low memory or aggressive background cleaners. In this case, the user would likely have issues with Toasts from all apps, not just yours. Suggest they restart their device or disable any third-party memory-cleaning apps that might be killing system processes.

• Incorrect Context Usage
  While using getApplicationContext() usually works for Toasts, some 6.0.1 custom ROMs enforce stricter context validation. Try replacing the application context with an Activity context (e.g., YourActivity.this) when creating the Toast. This ensures the Toast is tied to a visible activity, which might bypass ROM-level restrictions.

Start with the first two checks—custom ROM settings and custom Toast permissions—since those are the most frequent culprits for 6.0.1-specific Toast issues.

内容的提问来源于stack exchange，提问作者Pedro Neves