Unity游戏在小米固件设备上无法保存进度问题求助

Hey Dmitriy, I’ve dealt with this exact problem multiple times when deploying Unity games to Xiaomi devices—their aggressive system optimizations often clash with standard Unity save workflows. Here are the most common fixes that have worked for me:

1. Beat Xiaomi’s Background App Killing #

Xiaomi’s MIUI tends to force-stop apps immediately when you swipe them away, which means your OnApplicationQuit() or OnDestroy() save logic might never run.

• Add your game to the background protection whitelist: Guide users to go to Settings > Apps > [Your Game] > Battery Saver > No Restrictions. This prevents the system from killing the app abruptly.
• Save on pause instead of quit: Replace (or supplement) exit-time saving with OnApplicationPause(), which triggers when the app is sent to the background (before it might get killed). Example code:

  private void OnApplicationPause(bool pauseStatus)
  {
      if (pauseStatus) // App is being sent to background
      {
          SaveGameProgress(); // Your existing save function
      }
  }
  

2. Use Unity’s Persistent Data Path #

Xiaomi’s storage restrictions (especially on Android 10+) can block writes to external storage directories. Unity’s Application.persistentDataPath is a private, app-specific directory that avoids these issues.

• Update your save path to use this directory:

  string saveFilePath = Path.Combine(Application.persistentDataPath, "game_save.dat");
  // Use this path for all read/write operations
  

• Avoid using Application.dataPath or external storage paths unless absolutely necessary—those are far more likely to be blocked by MIUI.

3. Disable Battery Optimization for Your Game #

Xiaomi’s battery saver modes can prevent apps from writing to storage in the background.

• Have users navigate to Settings > Battery & Performance > Battery Saver > App Battery Saver > [Your Game] > Disable. This removes restrictions on background file operations.

4. Ensure Synchronous File Writes #

Asynchronous save operations might get interrupted by MIUI before they finish. Use synchronous methods to guarantee data is written completely:

// Instead of async writes, use synchronous calls
byte[] saveData = SerializeYourSaveData(); // Your serialization logic
File.WriteAllBytes(saveFilePath, saveData);

Quick Test to Diagnose #

First, add a manual save button to your game. If saving manually and restarting the app works, the issue is definitely the system killing the app before exit-time saves run. If even manual saves fail, focus on storage permissions and path issues.

Hope these tips get your saves working on Xiaomi devices!

内容的提问来源于stack exchange，提问作者Vogd