Get free space on internal memory

问题

Is it possible to get the amount of free memory on an Android device (not on the SD CARD) via the Android SDK?

If so, how?

回答1:

this post might fit well to your question.

also check this thread. there is so much info here on SO.

googled a bit and here is the solution (found at android git)

File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return Formatter.formatFileSize(this, availableBlocks * blockSize);

回答2:

/*************************************************************************************************
Returns size in bytes.

If you need calculate external memory, change this: 
    StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());
to this: 
    StatFs statFs = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath());        
**************************************************************************************************/
    public long TotalMemory()
    {
        StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());   
        long   Total  = ( (long) statFs.getBlockCount() * (long) statFs.getBlockSize());
        return Total;
    }

    public long FreeMemory()
    {
        StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());
        long   Free   = (statFs.getAvailableBlocks() * (long) statFs.getBlockSize());
        return Free;
    }

    public long BusyMemory()
    {
        StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());   
        long   Total  = ((long) statFs.getBlockCount() * (long) statFs.getBlockSize());
        long   Free   = (statFs.getAvailableBlocks()   * (long) statFs.getBlockSize());
        long   Busy   = Total - Free;
        return Busy;
    }

Converting bytes to human readable format (like 1 Mb, 1 Gb)

    public static String floatForm (double d)
    {
       return new DecimalFormat("#.##").format(d);
    }


    public static String bytesToHuman (long size)
    {
        long Kb = 1  * 1024;
        long Mb = Kb * 1024;
        long Gb = Mb * 1024;
        long Tb = Gb * 1024;
        long Pb = Tb * 1024;
        long Eb = Pb * 1024;

        if (size <  Kb)                 return floatForm(        size     ) + " byte";
        if (size >= Kb && size < Mb)    return floatForm((double)size / Kb) + " Kb";
        if (size >= Mb && size < Gb)    return floatForm((double)size / Mb) + " Mb";
        if (size >= Gb && size < Tb)    return floatForm((double)size / Gb) + " Gb";
        if (size >= Tb && size < Pb)    return floatForm((double)size / Tb) + " Tb";
        if (size >= Pb && size < Eb)    return floatForm((double)size / Pb) + " Pb";
        if (size >= Eb)                 return floatForm((double)size / Eb) + " Eb";

        return "???";
    }

回答3:

It looks like the StatFs class might be what you need to use. I'm not sure what path would be considered the root of the device, but I believe the result would be the same regardless of directory, as long as it's part of the internal storage. Something like this may work:

StatFs stats = new StatFs("/data");
int availableBlocks = stats.getAvailableBlocks();
int blockSizeInBytes = stats.getBlockSize();
int freeSpaceInBytes = availableBlocks * blockSizeInBytes;

If nothing else, the StatFs class should give you a good start on where to look.

回答4:

There are some methods which were deprecated by Google since 2013 and you might change these methods (API 18+ only):

• getAvailableBlocks() to getAvailableBlocksLong()
• getBlockCount() to getBlockCountLong()
• getBlockSize() to getBlockSizeLong()
• getFreeBlocks() to getFreeBlocksLong()

回答5:

On devices where internal memory size is very big it doesn't work because int value is too small. For example on Motorola xum it doesn't work. You have to use something like this:

int freeSpaceInKilobytes = availableBlocks * (blockSizeInBytes / 1024);

回答6:

/**
 * @return Number of bytes available on internal storage
 */
public static long getInternalAvailableSpace() {
    long availableSpace = -1L;
    try {StatFs stat = new StatFs(Environment.getDataDirectory()
            .getPath());
        stat.restat(Environment.getDataDirectory().getPath());
        availableSpace = (long) stat.getAvailableBlocks() * (long) stat.getBlockSize();
    } catch (Exception e) {
        e.printStackTrace();
    }

    return availableSpace;
}

回答7:

Please refer this link: Android get free size of internal/external memory This might help. Here, everything is explained in a nice way.

来源：https://stackoverflow.com/questions/4595334/get-free-space-on-internal-memory