Android to determine if SD card exists and capacity query

The first step is to increase the access rights of the SD card in Androidmanifest.xml

<!--Create and delete files in SDcard permissions--  <uses-permission android:name= "android.permission.MOUNT_UNMOUNT_ Filesystems "/>  <!--writing data to SDcard permissions--  <uses-permission android:name=" Android.permission.WRITE _external_storage "/>   

does the SD card exist

Private Boolean Existsdcard () {    if (android.os.Environment.getExternalStorageState (). Equals (      Android.os.Environment.MEDIA_MOUNTED) {     return true;    } else     return false;   }  

SD Card remaining space

Public long Getsdfreesize () {       //Get SD card file path       = Environment.getexternalstoragedirectory ();        StatFs SF = new StatFs (Path.getpath ());        Gets the size of a single data block (Byte)       Long blockSize = Sf.getblocksize ();        The number of idle data blocks       long freeblocks = Sf.getavailableblocks ();       Return SD card idle size       //return freeblocks * blockSize;  Unit byte       //return (Freeblocks * blockSize)/1024;   Unit KB       return (freeblocks * blockSize)/1024/1024;//unit MB     }   

total SD card capacity

Public long Getsdallsize () {       //Get SD card file path       = Environment.getexternalstoragedirectory ();        StatFs SF = new StatFs (Path.getpath ());        Gets the size of a single data block (Byte)       Long blockSize = Sf.getblocksize ();        Gets the number of all data blocks       long allblocks = Sf.getblockcount ();       Return SD card size       //return allblocks * blockSize;//Unit byte       //return (Allblocks * blockSize)/1024;//unit KB       return ( Allblocks * blockSize)/1024/1024; Unit MB     }