Android to determine if SD card exists and capacity query

An easy way for Android to determine the presence and capacity of an SD card is as follows:
The first step is to increase the access rights of the SD card in Androidmanifest.xml

[HTML]View Plaincopy

1. <!--Create and delete files in SDcard permissions--
2. <uses-permission android:name="Android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
3. <!--write data to sdcard permissions--
4. <uses-permission android:name="Android.permission.WRITE_EXTERNAL_STORAGE"/>

Does the SD card exist

[Java]View Plaincopy

1. Private Boolean Existsdcard () {
2. if (Android.os.Environment.getExternalStorageState (). Equals (
3. Android.os.Environment.MEDIA_MOUNTED)) {
4. return true;
5. } Else
6. return false;
7. }

SD Card remaining space [Java]View Plaincopy

2. Public Long Getsdfreesize () {
4. //Get SD card file path
6. File path = Environment.getexternalstoragedirectory ();
8. StatFs SF = new StatFs (Path.getpath ());
10. //Gets the size of a single data block (Byte)
12. Long blockSize = Sf.getblocksize ();
14. //number of idle data blocks
16. Long freeblocks = Sf.getavailableblocks ();
18. //Return SD card idle size
20. //return freeblocks * blockSize; Unit byte
22. //return (freeblocks * blockSize)/1024; Unit KB
24. return (Freeblocks * blockSize)/1024x768/1024; //units MB
26. }

Total SD card capacity [Java]View Plaincopy

2. Public Long Getsdallsize () {
4. //Get SD card file path
6. File path = Environment.getexternalstoragedirectory ();
8. StatFs SF = new StatFs (Path.getpath ());
10. //Gets the size of a single data block (Byte)
12. Long blockSize = Sf.getblocksize ();
14. //Get the number of all data blocks
16. Long allblocks = Sf.getblockcount ();
18. //Return SD card size
20. //return allblocks * blockSize;//Unit byte
22. //return (allblocks * blockSize)/1024;//unit KB
24. return (Allblocks * blockSize)/1024/1024; //units MB
26. }