Android to determine if SD card exists and capacity

First, add the SD card access to the Androidmanifest.xml

<!---  <android:name = " Android.permission.MOUNT_UNMOUNT_FILESYSTEMS "/>  <!----   <android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"  />   

    //whether the SD exists    Private BooleanExistsdcard () {if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {return true; } Else                 return false; }    //SD remaining space     Public Longgetsdfreesize () {//get SD card file pathFile Path =environment.getexternalstoragedirectory (); StatFs SF=NewStatFs (Path.getpath ()); //gets the size of a single data block (Byte)         LongBlockSize =sf.getblocksize (); //the number of free data blocks         LongFreeblocks =sf.getavailableblocks (); //return SD card idle size//return freeblocks * blockSize; //Unit byte//return (Freeblocks * blockSize)/1024; //Unit KB         return(Freeblocks * blockSize)/1024/1024;//units MB    }    //SD Total Capacity     Public Longgetsdallsize () {//get SD card file pathFile Path =environment.getexternalstoragedirectory (); StatFs SF=NewStatFs (Path.getpath ()); //gets the size of a single data block (Byte)        LongBlockSize =sf.getblocksize (); //get the number of all data blocks        LongAllblocks =Sf.getblockcount (); //return SD card size//return allblocks * blockSize;//Unit byte//return (allblocks * blockSize)/1024;//Unit KB        return(Allblocks * blockSize)/1024/1024;//units MB}

Android to determine if SD card exists and capacity