How to Check available space on android device ? on SD card? [duplicate]

Question

Yaroslav's answer will give the size of the SD card, not the available space. StatFs's getAvailableBlocks() will return the number of blocks that are still accessible to normal programs. Here is the function I am using:

public static float megabytesAvailable(File f) {
    StatFs stat = new StatFs(f.getPath());
    long bytesAvailable = (long)stat.getBlockSize() * (long)stat.getAvailableBlocks();
    return bytesAvailable / (1024.f * 1024.f);
}

The above code has reference to some deprecated functions as of August 13, 2014. I below reproduce an updated version:

public static float megabytesAvailable(File f) {
    StatFs stat = new StatFs(f.getPath());
    long bytesAvailable = 0;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR2)
        bytesAvailable = (long) stat.getBlockSizeLong() * (long) stat.getAvailableBlocksLong();
    else
        bytesAvailable = (long) stat.getBlockSize() * (long) stat.getAvailableBlocks();
    return bytesAvailable / (1024.f * 1024.f);
}

Try this code:

StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());

long bytesAvailable = (long)stat.getBlockSize() *(long)stat.getBlockCount();
long megAvailable   = bytesAvailable / 1048576;

System.out.println("Megs: " + megAvailable);

Update:

getBlockCount() - return size of SD card;

getAvailableBlocks() - return the number of blocks that are still accessible to normal programs (thanks Joe)

I have designed some ready to use functions to get available space in different units. You can use these methods by simply copying any one of them into your project.

/**
 * @return Number of bytes available on External storage
 */
public static long getAvailableSpaceInBytes() {
    long availableSpace = -1L;
    StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
    availableSpace = (long) stat.getAvailableBlocks() * (long) stat.getBlockSize();

    return availableSpace;
}


/**
 * @return Number of kilo bytes available on External storage
 */
public static long getAvailableSpaceInKB(){
    final long SIZE_KB = 1024L;
    long availableSpace = -1L;
    StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
    availableSpace = (long) stat.getAvailableBlocks() * (long) stat.getBlockSize();
    return availableSpace/SIZE_KB;
}
/**
 * @return Number of Mega bytes available on External storage
 */
public static long getAvailableSpaceInMB(){
    final long SIZE_KB = 1024L;
    final long SIZE_MB = SIZE_KB * SIZE_KB;
    long availableSpace = -1L;
    StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
    availableSpace = (long) stat.getAvailableBlocks() * (long) stat.getBlockSize();
    return availableSpace/SIZE_MB;
}

/**
 * @return Number of gega bytes available on External storage
 */
public static long getAvailableSpaceInGB(){
    final long SIZE_KB = 1024L;
    final long SIZE_GB = SIZE_KB * SIZE_KB * SIZE_KB;
    long availableSpace = -1L;
    StatFs stat = new StatFs(Environment.getExternalStorageDirectory().getPath());
    availableSpace = (long) stat.getAvailableBlocks() * (long) stat.getBlockSize();
    return availableSpace/SIZE_GB;
}

Based on this answer, Added support to Android version < 18

public static float megabytesAvailable(File file) {
    StatFs stat = new StatFs(file.getPath());
    long bytesAvailable;
    if(Build.VERSION.SDK_INT >= 18){
        bytesAvailable = getAvailableBytes(stat);
    }
    else{
        //noinspection deprecation
        bytesAvailable = stat.getBlockSize() * stat.getAvailableBlocks();
    }

    return bytesAvailable / (1024.f * 1024.f);
}

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
private static long getAvailableBytes(StatFs stat) {
    return stat.getBlockSizeLong() * stat.getAvailableBlocksLong();
}