FileInputStream



FileINputStream

FileInputStream,:This stream is not buffered. Most callers should wrap this stream with aBufferedInputStream.

这个流不缓冲，绝大多数情况下使用BufferedInputStream来包装

比如读取一个文件Flie sdCardDir=Environment.getExternalStorageDirectonry();

1）构造器

ileInputStream(File file)
Constructs a new FileInputStream that reads from file.

FileInputStream(FileDescriptor fd)//可以补考虑
Constructs a new FileInputStream that reads from fd.

FileInputStream(String path)//根据文件路径获取对应的流
Equivalent to new FileInputStream(new File(path)).

2）方法intavailable()

Returns an estimated number of bytes that can be read or skipped without blocking for more input.

voidclose()

Closes this stream.

intread()

Reads a single byte from this stream and returns it as an integer in the range from 0 to 255.

intread(byte[] buffer, int byteOffset, int byteCount)

Reads up to byteCount bytes from this stream and stores them in the byte arraybuffer starting at byteOffset.

longskip(long byteCount)

Skips at most n bytes in this stream.