The use of read files commonly used in Android is as follows

1. Read the file data from resource raw:

""; try{in= Getresources (). Openrawresource (r.raw.test);  Get the size of the data in.available ();  Byte[length]; //Read data in.read (buffer);" BIG5 "); //Close in.close ();} catch (Exception e) {e.printstacktrace ();}          

2. Read the file data from the resource asset

File name string res="";  try{in= Getresources (). Getassets (). open (fileName);  In.available (); Byte[length]; in.read (buffer); "UTF-8");} catch (Exception e) {e.printstacktrace ();}       

3. Read and write the files on the/data/data/< application name > directory:

Write DataPublicvoid WriteFile (String filename,string writestr)Throws ioexception{try{fileoutputstream fout =openfileoutput (FileName, mode_private); catch (Exception e) {e.printstacktrace ();} //read data public String readFile (string fileName)  Throws ioexception{string Res=new fileinputstream (Jsonflie); byte [] buffer = new byte[length];fin.read (buffer ), res = encodingutils.getstring (buffer, catch (Exception e) {e.printstacktrace ();} return res;}             

4. Read and write the files in the SD card. Which is the file under the/mnt/sdcard/directory.

Write data to files in SDPublicvoid Writefilesdcardfile (String filename,string write_str)Throws ioexception{try{fileoutputstream fout = new fileoutputstream (fileName); byte [] bytes = Write_str.getbytes (); fout.write (bytes); Fout.close ();} catch (Exception e) {e.printstacktrace ();}} //read files in SD public String readfilesdcardfile (string fileName) throws ioexception{string res=new fileinputstream (fileName); byte [] buffer = new byte[length];fin.read (buffer ), res = encodingutils.getstring (buffer, catch (Exception e) {e.printstacktrace ();} return res;}              

5. Use the file class to read and write files:

Read the filepublic string Readsdfile (string fileName)throws ioexception {File File = new File (FileName); FileInputStream FIS = new fileinputstream (file); byte [] buffer = new byte[length];fis.read (buffer ), res = encodingutils.getstring (buffer, //write file public void writesdfile (String fileName, String write_str) throws ioexception{file file = new file (fileName); FileOutputStream fos = new fileoutputstream (file);        

6. [Code] v. In addition, the file class has some of the following common operations:

String Name = File.getname (); Get the name of the file or folder:

String Parentpath = File.getparent (); Get the parent directory of a file or folder

String path = File.getabsoultepath ();//Absolute Road warp

String path = File.getpath ();//Relative Road warp

File.createnewfile ();//Build file

File.mkdir (); Create a folder

File.isdirectory (); Judging is a file or folder

file[] files = file.listfiles (); List all file and folder names under a folder

File.renameto (dest); Modify folder and file name

File.delete (); Delete a folder or file

1. There are two kinds of resource files in apk, which are used in two different ways.
Raw uses inputstream in = Getresources (). Openrawresource (R.raw.test);

Asset uses inputstream in = Getresources (). Getassets (). open (FileName);

This data can only be read and cannot be written. More importantly, the file size under this directory cannot exceed 1M.

Also, it is important to note that you need to add throws IOException to the function name when using InputStream.

2, the files in the SD card use FileInputStream and FileOutputStream for file operation.

3, stored in the data area (/data/data/.) Files can only be manipulated using Openfileoutput and Openfileinput.

Note You cannot use FileInputStream and FileOutputStream for file operations.

4, the Randomaccessfile class is limited to file operation, cannot access other IO devices. It can jump to any location of the file and start reading and writing from the current position.

Excerpted from T9team

The use of read files commonly used in Android is as follows