安卓Oreo(8.0)版本内存(RAM)清理功能内存总量获取问题求助

Hey there, sorry to hear you’ve been stuck on this for 10 days—nothing’s more frustrating than a single Android version breaking a feature that works flawlessly everywhere else. Let’s dive into some targeted tips that might help you figure out why your RAM cleaner can’t get total memory like Clean Master does on Oreo:

• Audit Oreo’s Permission Restrictions
  Android 8.0 locked down access to system-level stats in a big way. The ActivityManager.getMemoryInfo() call that works on other versions might be returning incomplete data here because your app lacks the right permissions. Make sure you’ve declared android.permission.READ_DEVICE_STATS in your manifest—this is a restricted permission, so users have to manually grant it via Settings > Apps > [Your App] > Permissions > Device Stats. Clean Master likely gets around this either by being pre-installed on many devices (granting it system-level privileges) or using a hidden permission whitelist.

• Check /proc/meminfo Access
  A common method to fetch total RAM is reading the /proc/meminfo file, specifically the MemTotal line. But Oreo restricted third-party app access to certain proc filesystem entries. Try reading this file programmatically with BufferedReader and see if you hit a permission denied error. If so, that’s your culprit. Clean Master might use a native component with elevated privileges or a system service workaround to access this file when regular apps can’t.

• Test Alternative API Paths
  The totalMem field in ActivityManager.MemoryInfo might be returning 0 or wrong values on Oreo. You could try checking SystemProperties.get("ro.runtime.memtotal"), but this requires the android.permission.READ_PRIVILEGED_PHONE_STATE permission—only available to system apps, which might explain why Clean Master can use it if it’s pre-installed. Another angle: use adb shell dumpsys meminfo on an Oreo device to see what system-level data is exposed, then replicate that in your app if possible.

• Rule Out Device-Specific Quirks
  Is this issue happening on all Oreo devices, or just specific manufacturer models? Some OEMs modify their Oreo ROMs to restrict system stats access even more. Test on a stock Android 8.0 emulator first to eliminate device-specific tweaks as the cause.

• Ethically Reverse-Engineer Clean Master’s Workflow
  Install Clean Master on an Oreo device and use Android Studio’s Profiler or adb logcat to monitor its behavior when it calculates total RAM. Look for calls to hidden system services, native library invocations, or permission requests that your app isn’t making. Just remember to do this strictly for educational purposes, respecting their intellectual property.

The image you shared clearly shows the discrepancy between your app’s RAM total and Clean Master’s on Oreo—this confirms the issue is tied to Oreo’s unique system restrictions or API changes, not a general bug in your code.

Hopefully these leads help you get to the bottom of this! It’s a tricky one, but focusing on Oreo’s permission and filesystem changes should point you toward a solution.

内容的提问来源于stack exchange，提问作者Vaibhav patel