Files on Android SD card

1. Get the storage device directory:/sdcard (normally)

Sdpath=environment.getexternalstoragedirectory () +"/";

2. Determine if the folder on the SD card exists: through the Exists () method of the File object.

  /* *   * Determine if the document already exists;   *  /Public  Boolean checkfileexists (String filepath) {         file File=new file (sdpath+filepath);         return file.exists ();    } 

3. Create a directory on the SD card: implemented by the mkdir () method of the File object.

/*    * Create a directory on the SD card   ;*    /Public File Createdir (String dirpath) {    file dir =new File (sdpath+dirpath);    Dir.mkdir ();     return dir;}

4. Create the file on the SD card: implemented by the CreateNewFile () method of the File object.

  /*    * Create file on SD card;   */public       file CreateFile (String filepath) throws ioexception{      File File=new file (sdpath+filepath);           File.createnewfile ();            return file;     }

5. Write the InputStream byte stream to the SD card file .

  /** * Write data from one InputStream to sd card*/    Publicfile Writestreamtosdcard (String dirpath,string filename,inputstream input) {file file=NULL; OutputStream Output=NULL; Try {                  //create a directory;Createdir (Dirpath); //create a file on the created directory;File = CreateFile (dirpath+filename); Output=Newfileoutputstream (file); byte[]bt=New byte[4*1024x768];  while(Input.read (BT)!=-1) {output.write (BT); }                //Refresh the cache,Output.flush (); } Catch(IOException e) {e.printstacktrace (); }              finally{                  Try{output.close (); }          Catch(Exception e) {e.printstacktrace (); }              }             returnfile; }

Files on Android SD card