Hi,
I am wondering how to find out how much space is left on the device
before I download something big?
According to the documentation StatFs would have the appropriate
methods for doing that, but in practice I failed with StatFs on the
emulator and G1.
Here is a piece of code using those methods from within an Activity:
String path = getFilesDir().getAbsolutePath();
StatFs statFs = new StatFs(path);
Log.d("X", "Free Blocks (1) =" + statFs.getFreeBlocks());
Log.d("X", "Available Blocks (1) =" + statFs.getAvailableBlocks());
byte[] oneMegaByte = new byte[1024 * 1024];
FileOutputStream fos = openFileOutput("dummy", Context.MODE_PRIVATE);
for (int i = 0; i < 10; i++)
fos.write(oneMegaByte);
fos.close();
// statFs.restat(path); -> makes no difference
Log.d("X", "Free Blocks (2) =" + statFs.getFreeBlocks());
Log.d("X", "Available Blocks (2) =" + statFs.getAvailableBlocks());
It uses the above mentioned functionality to print how many blocks
are free/available on the device, then writes a 10MB file and checks
the free/available blocks again. Unfortunately without any success:
D/X ( 401): Free Blocks (1) =9582
D/X ( 401): Available Blocks (1) =9582
D/dalvikvm( 401): GC freed 681 objects / 46160 bytes in 69ms
I/dalvikvm-heap( 401): Grow heap (frag case) to 4.001MB for 1048592-
byte allocation
D/dalvikvm( 401): GC freed 190 objects / 10096 bytes in 66ms
D/X ( 401): Free Blocks (2) =9582
D/X ( 401): Available Blocks (2) =9582
The file has been created though:
# pwd
/data/data/test.listview/files
# ls -l
-rw-rw---- app_20 app_20 10485760 2009-01-14 14:59 dummy
# df
/dev: 47284K total, 0K used, 47284K available (block size 4096)
/sqlite_stmt_journals: 4096K total, 0K used, 4096K available (block
size 4096)
/system: 65536K total, 43424K used, 22112K available (block size 4096)
/data: 65536K total, 37448K used, 28088K available (block size 4096)
/cache: 65536K total, 1156K used, 64380K available (block size 4096)
/sdcard: 258064K total, 115K used, 257949K available (block size 512)
#
When using df I can see a difference though:
# df
..
/data: 65536K total, 37448K used, 28088K available (block size 4096)
..
# rm dummy
# df
..
/data: 65536K total, 27208K used, 38328K available (block size 4096)
..
Any ideas how to do that properly?
Cheers,
Mariano
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