File path = Environment.getExternalStorageDirectory();/* * Retrieve overall information about the space on a filesystem.  * This is a wrapper for Unix statvfs().  */StatFs stat = new StatFs(path.getPath());long blockSize = stat.getBlockSize();long totalBlocks = stat.getBlockCount();long availableBlocks = stat.getAvailableBlocks();long totalSize = blockSize * totalBlocks;long availSize = availableBlocks * blockSize;String totalStr = Formatter.formatFileSize(this, totalSize);String availStr = Formatter.formatFileSize(this, availSize);

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