@Override
public void handleMessage(Message msg) {
    switch (msg.what) {
        case MSG_START_LOADING_SIZES: {
            List<PackageStats> stats = new ArrayList<>();
            List<UserInfo> users = mUm.getUsers();
            for (int userCount = 0, userSize = users.size();
                    userCount < userSize; userCount++) {
                UserInfo user = users.get(userCount);
                final List<ApplicationInfo> apps = mPm.getInstalledApplicationsAsUser(
                        PackageManager.MATCH_DISABLED_COMPONENTS, user.id);

                for (int appCount = 0, size = apps.size(); appCount < size; appCount++) {
                    ApplicationInfo app = apps.get(appCount);
                    if (!Objects.equals(app.volumeUuid, mVolume.getFsUuid())) {
                        continue;
                    }

                    try {
                        StorageStats storageStats =
                                mStorageStatsManager.queryStatsForPackage(app.storageUuid,
                                        app.packageName, user.getUserHandle());
                        PackageStats packageStats = new PackageStats(app.packageName,
                                user.id);
                        packageStats.cacheSize = storageStats.getCacheBytes();
                        packageStats.codeSize = storageStats.getAppBytes();
                        packageStats.dataSize = storageStats.getDataBytes();
                        stats.add(packageStats);
                    } catch (NameNotFoundException | IOException e) {
                        Log.e(TAG, "An exception occurred while fetching app size", e);
                    }
                }
            }

            mStats.complete(stats);
        }
    }
}
 

/**
 * 获取应用的大小
 */
@RequiresApi(api = Build.VERSION_CODES.O)
private static void getAppSizeAboveO(Context context, @NonNull OnGetSizeListener listener) {
    StorageStatsManager storageStatsManager = (StorageStatsManager) context
            .getSystemService(Context.STORAGE_STATS_SERVICE);
    StorageManager storageManager = (StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
    // 获取所有应用的StorageVolume列表
    List<StorageVolume> storageVolumes = storageManager.getStorageVolumes();
    for (StorageVolume item : storageVolumes) {
        String uuidStr = item.getUuid();
        UUID uuid;
        if (uuidStr == null) {
            uuid = StorageManager.UUID_DEFAULT;
        } else {
            uuid = UUID.fromString(uuidStr);
        }
        int uid = getUid(context, context.getPackageName());
        // 通过包名获取uid
        StorageStats storageStats;
        try {
            storageStats = storageStatsManager.queryStatsForUid(uuid, uid);
            AppSizeInfo ctAppSizeInfo = new AppSizeInfo();
            ctAppSizeInfo.cacheSize = storageStats.getCacheBytes();
            ctAppSizeInfo.dataSize = storageStats.getDataBytes();
            ctAppSizeInfo.codeSize = storageStats.getAppBytes();
            listener.onGetSize(ctAppSizeInfo);
        } catch (IOException e) {
            listener.onError(e);
        }
    }
}