Android Google Saved Games 意外冲突

Posted 2023-04-14

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【中文标题】Android Google Saved Games 意外冲突【英文标题】：Android Google Saved Games unexpected conflicts 【发布时间】：2016-11-16 14:47:09 【问题描述】：

在我的游戏中，我有游戏内货币，我想将其价值保存到云端。我决定使用 Google Saved Games API。一切都很好，但是当我将数据保存到快照中，然后在游戏再次启动时读取它时，即使我在同一台设备上，我也会遇到冲突。现在我在每次更改后保存货币的状态，所以当玩家花费或获得一些“硬币”时。我在想这可能经常发生并且服务无法处理它，因为当我离线时（没有连接到网络）一切都很好而且很快，但是当我在线时（连接到 Wi-fi）可以使用快照速度较慢，正如我所说，我与上次保存的数据和以前保存的数据发生冲突（我正在记录所有值......）。有时我什至会遇到 5 个冲突。我有 3 个函数可用于保存的游戏。一种用于读取数据，一种用于保存数据，一种用于检查冲突：

读取数据：

private void readSavedGame(final String snapshotName) 
    AsyncTask<Void, Void, Boolean> readingTask = new AsyncTask<Void, Void, Boolean>() 
        @Override
        protected Boolean doInBackground(Void... params) 
            Snapshots.OpenSnapshotResult result = Games.Snapshots.open(mGoogleApiClient, snapshotName, false).await();

            Snapshot snapshot = processSnapshotOpenResult(result, 0);

            if(snapshot != null) 
                try 
                    updateGameData(snapshot.getSnapshotContents().readFully());
                    Log.d(TAG, "Updating game: "+String.valueOf(coins)+"...");
                    return true;
                 catch (IOException e) 
                    Log.d(TAG, "Error: " + e.getMessage());
                
            

            return false;
        

        @Override
        protected void onPostExecute(Boolean result) 
            super.onPostExecute(result);

            if(result) Log.d(TAG, "Game state read successfully...");
            else Log.d(TAG, "Error while reading game state...");

            updateUi();
        
    ;

    readingTask.execute();

保存数据：

private void writeSavedGame(final String snapshotName, final byte[] data) 
    AsyncTask<Void, Void, Boolean> updateTask = new AsyncTask<Void, Void, Boolean>() 
        @Override
        protected Boolean doInBackground(Void... params) 
            Snapshots.OpenSnapshotResult result = Games.Snapshots.open(
                    mGoogleApiClient, snapshotName, false).await();

            Snapshot snapshot = processSnapshotOpenResult(result, 0);

            if(snapshot != null) 
                snapshot.getSnapshotContents().writeBytes(getGameData());
                Log.d(TAG, "Saving: "+String.valueOf(coins)+"...");

                Snapshots.CommitSnapshotResult commitSnapshotResult = Games.Snapshots.commitAndClose(mGoogleApiClient, snapshot, SnapshotMetadataChange.EMPTY_CHANGE).await();

                if(commitSnapshotResult.getStatus().isSuccess()) return true;
            

            return false;
        

        @Override
        protected void onPostExecute(Boolean result) 
            if (result) Log.d(TAG, "Game was saved successfully....");
            else Log.d(TAG, "Error while saving game state...");
        
    ;

    updateTask.execute();

检查冲突或处理 OpenSnapshotResult

Snapshot processSnapshotOpenResult(Snapshots.OpenSnapshotResult result, int retryCount) 
    Snapshot mResolvedSnapshot = null;
    retryCount++;

    int status = result.getStatus().getStatusCode();
    Log.i(TAG, "Save Result status: " + status);

    if (status == GamesStatusCodes.STATUS_OK) 
        Log.d(TAG, "No conflict, SNAPSHOT is OK");
        return result.getSnapshot();
     else if (status == GamesStatusCodes.STATUS_SNAPSHOT_CONTENTS_UNAVAILABLE) 
        return result.getSnapshot();
    
    else if (status == GamesStatusCodes.STATUS_SNAPSHOT_CONFLICT) 
        Log.d(TAG, "Conflict: "+String.valueOf(retryCount));

        Snapshot snapshot = result.getSnapshot();
        Snapshot conflictSnapshot = result.getConflictingSnapshot();

        // Resolve between conflicts by selecting the newest of the conflicting snapshots.
        mResolvedSnapshot = snapshot;

        if (snapshot.getMetadata().getLastModifiedTimestamp() <
                conflictSnapshot.getMetadata().getLastModifiedTimestamp()) 
            mResolvedSnapshot = conflictSnapshot;
        

        try 
            Log.d(TAG, "Snapshot data: "+new String(snapshot.getSnapshotContents().readFully()));
            Log.d(TAG, "Conflicting data: "+new String(conflictSnapshot.getSnapshotContents().readFully()));
         catch (IOException e) 
            Log.e(TAG, "ERROR WHILE READING SPAPSHOTS CONTENTS...");
        


        Snapshots.OpenSnapshotResult resolveResult = Games.Snapshots.resolveConflict(
                mGoogleApiClient, result.getConflictId(), mResolvedSnapshot).await();

        if (retryCount < MAX_SNAPSHOT_RESOLVE_RETRIES) 
            // Recursively attempt again
            return processSnapshotOpenResult(resolveResult, retryCount);
         else 
            // Failed, log error and show Toast to the user
            String message = "Could not resolve snapshot conflicts";
            Log.e(TAG, message);
            //Toast.makeText(getBaseContext(), message, Toast.LENGTH_LONG).show();
        

    

    // Fail, return null.
    return null;

很好地解释了冲突原则here。我的代码基于official docs implementations 和samples。

所以离线时，一切正常，但连接时，我在同一台设备上遇到冲突……也许我经常更新我保存的游戏，而服务无法处理。有任何想法吗？谢谢。

【问题讨论】：

你解决了吗？我面临同样的问题。相同的代码在 iCloud 上运行良好，但在 Google 上会产生随机冲突。它与保存频率有关吗？文档的“合理频率”毫无意义。我也遇到了同样的问题，你的最终解决方案是什么？ 【参考方案1】：

如Saved Games - Conflict resolution中所述