public String getDataTotalSize(Context context){
StatFs sf = new StatFs(context.getCacheDir().getAbsolutePath());
long blockSize = sf.getBlockSize();
long totalBlocks = sf.getBlockCount();
return Formatter.formatFileSize(context, blockSize*totalBlocks);
}
原文：https://www.cnblogs.com/pxuan/p/14880639.html