内外部存储大小

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)private String getAvailSpace(String path) {    StatFs fs = new StatFs(path);    long totalBlocks = fs.getAvailableBlocksLong();    long size = fs.getBlockSizeLong();    return android.text.format.Formatter.formatFileSize(this,totalBlocks*size);}String rom = getAvailSpace(Environment.getDataDirectory().getAbsolutePath());
String sdCard = getAvailSpace(Environment.getExternalStorageDirectory().getAbsolutePath());