如何检查android设备上的可用空间？在SD卡上？

Question

如何查看Android设备上还剩下多少MB或GB？我正在使用JAVA和android SDK 2.0.1。是否有任何系统服务会公开这样的信息？

Answer 1

试试这个代码：

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

long bytesAvailable = (long)stat.getBlockSize() *(long)stat.getBlockCount();

long megAvailable   = bytesAvailable / 1048576;

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

更新：

getBlockCount() -SD卡的返回大小；

getAvailableBlocks() -返回普通程序仍可访问的块数（感谢乔）

Answer 2

Yaroslav的答案将给出SD卡的大小，而不是可用空间。StatFs getAvailableBlocks()将返回普通程序仍可访问的块数。这是我正在使用的功能：

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);

}

上面的代码引用了一些不推荐使用的功能。下面我复制一个更新的版本：

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);

}

Answer 3

我设计了一些现成的函数来获取不同单位的可用空间。您可以通过简单地将其中任何一种复制到项目中来使用这些方法。

/**

 * @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;

}