Android programming to determine the existence of SD card and the use of capacity query implementation method _android

This paper illustrates the existence of the SD card and the implementation of capacity query using the Android programming method. Share to everyone for your reference, specific as follows:

1. To determine whether the existence of SD card returns TRUE indicates existence

/* To determine if SD card exists returns true to exist
/public boolean Avaiablemedia () {
  String status = Environment.getexternalstoragestate ();
  if (Status.equals (environment.media_mounted)) {return
   true;
  } else {return
   false;
}}

2. Get SD card free space

/* Get SD card free space *
/public long getsdfreesize () {
  //Get SD card file path filename
  Environment.getexternalstoragedirectory ();
  Statfs SF = new Statfs (Path.getpath ());
  Gets the size of a single block of data (Byte)
  Long blockSize = Sf.getblocksizelong ();
  The number of free blocks of data
  long freeblocks = Sf.getavailableblockslong ();
  Back to SD card idle size
  //return freeblocks * blockSize;//unit byte
  //Return (Freeblocks * blockSize)/1024;//unit KB
  RE Turn (Freeblocks * blockSize)/1024/1024; per MB
}

3. Get SD card all the space

/* Get SD Card all space/public
long Getsdallsize () {
  //Get SD card file path filename
  Environment.getexternalstoragedirectory ();
  Statfs SF = new Statfs (Path.getpath ());
  Gets the size of a single block of data (Byte)
  Long blockSize = Sf.getblocksizelong ();
  Gets all data blocks number
  long allblocks = Sf.getblockcountlong ();
  Back to SD card size
  //return allblocks * blockSize;//unit byte
  //Return (Allblocks * blockSize)/1024;//unit KB
  return (Allblocks * blockSize)/1024/1024; per MB
}

I hope this article will help you with the Android program.