注意StatFs＆amp; int在新设备上溢出

this answer 中的方法在具有大量外部存储空间的设备上被破坏。例如，在我的Nexus 7上，它实际上会返回~2 GB，实际上还剩下大约10 GB的空间。

// DOES NOT WORK CORRECTLY ON DEVICES WITH LARGE STORAGE DUE TO INT OVERFLOW
File externalStorageDir = Environment.getExternalStorageDirectory();
StatFs statFs = new StatFs(externalStorageDirectory.getAbsolutePath());  
int free = (statFs.getAvailableBlocks() * statFs.getBlockSize()) / 1024 / 1024;

StatF确实有返回long，getAvailableBlocksLong()和getBlockCountLong()的替换方法，但问题是它们只是在 API级别18 中添加。

改为使用

最简单的方法是使用API级别9中添加的getFreeSpace() in java.io.File，它返回long：

返回包含此字节的分区上的空闲字节数路径。如果此路径不存在，则返回0。

因此，要在外部存储空间获得可用空间（＆＃34; SD卡＆＃34;）：

File externalStorageDir = Environment.getExternalStorageDirectory();
long free = externalStorageDir.getFreeSpace() / 1024 / 1024;

或者，如果确实想要使用StatF但需要支持API级别＆lt; 18，这将修复整数溢出：

File externalStorageDir = Environment.getExternalStorageDirectory();
StatFs statFs = new StatFs(externalStorageDir.getAbsolutePath());  
long blocks = statFs.getAvailableBlocks();
long free = (blocks * statFs.getBlockSize()) / 1024 / 1024;

Answer 2

/******************************************************************************************
Returns size in MegaBytes.

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  = (statFs.getBlockCount() * statFs.getBlockSize()) / 1048576;
        return total;
    }

    public long freeMemory()
    {
        StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());
        long   free   = (statFs.getAvailableBlocks() * statFs.getBlockSize()) / 1048576;
        return free;
    }

    public long busyMemory()
    {
        StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());   
        long   total  = (statFs.getBlockCount() * statFs.getBlockSize()) / 1048576;
        long   free   = (statFs.getAvailableBlocks() * statFs.getBlockSize()) / 1048576;
        long   busy   = total - free;
        return busy;
    }

Answer 3

使用StatFs并将外部存储目录的路径传递给构造函数，然后可以在getAvailableBlocks()对象上调用getBlockSize()和StatFs等函数。

Answer 4

我认为您可以使用此声明来处理您的问题。这不能检查是否有足够的SD卡容量。

if(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)){
    //to do something in here
}

Answer 5

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

    return availableSpace;
}

Answer 6

以下是获取内部存储空间大小的方法：

 StatFs statFs = new StatFs(Environment.getRootDirectory().getAbsolutePath());        
 long blockSize = statFs.getBlockSize();
 long totalSize = statFs.getBlockCount()*blockSize;
 long availableSize = statFs.getAvailableBlocks()*blockSize;
 long freeSize = statFs.getFreeBlocks()*blockSize;

以下是获得外部存储空间大小（SD卡大小）的方法：

 StatFs statFs = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath());        
 long blockSize = statFs.getBlockSize();
 long totalSize = statFs.getBlockCount()*blockSize;
 long availableSize = statFs.getAvailableBlocks()*blockSize;
 long freeSize = statFs.getFreeBlocks()*blockSize;

如何检查外部存储空间的可用性？

6 个答案:

注意StatFs＆amp; int在新设备上溢出

改为使用