Storage of data (2) using file storage

I. Overview of File saving

1. Seat of the file preservation

/data/data/<packagename>/files

2. Method of file operation

Openfileinput ()

Openfileoutput ()

DeleteFile ()

FileList () ....

Two. Create and write files in default table

1. Get an output stream FileOutputStream object

Openfileoutput ("MyFile.txt", context.mode_private);

Streams in Java have to specify the output path, but in Android, Openfileoutput is not, and this is a handy place for Android. The default path will be used, as above.

2. Write data to the stream

Write (Data.getbytes ());

Because in 1 we get the FileOutputStream byte stream, which can only be written in bytes. So we're going to turn the data (string) into a byte class,

Of course, we can also use OutputStreamWriter to turn it into a character stream and then manipulate it.

3.close Flow

Fos.close ()

Three. read files in default location

1. Create an input stream

FileInputStream fis; input byte throttling

InputStreamReader ISR; character streams

BufferedReader BR; Buffered stream that can be read over a section

FIS = openfileinput ("MyFile.txt");

ISR =new InputStreamReader (FIS);

br = new BufferedReader (ISR);

2. Reading data

We can use ReadLine here ()

String str =null;

STR =br.readline ();

3. Close the Stream

Fis.close ();

Isr.close ();

Br.close ();