内部存储空间

我们知道，存储硬件的空间是按着区块来划分的，每个区块有固定的大小。存储设备的总大小=区块大小*区块数量。通过StatFs类，我们可以获取到总的区块，可用区块和每个区块的字节大小等信息。

/**

* 获取手机内部空间总大小

*

* @return 大小，字节为单位

*/

static public long getTotalInternalMemorySize() {

//获取内部存储根目录

File path = Environment.getDataDirectory();

//系统的空间描述类

StatFs stat = new StatFs(path.getPath());

//每个区块占字节数

long blockSize = stat.getBlockSize();

//区块总数

long totalBlocks = stat.getBlockCount();

return totalBlocks * blockSize;

}

/**

* 获取手机内部可用空间大小

*

* @return 大小，字节为单位

*/

static public long getAvailableInternalMemorySize() {

File path = Environment.getDataDirectory();

StatFs stat = new StatFs(path.getPath());

long blockSize = stat.getBlockSize();

//获取可用区块数量

long availableBlocks = stat.getAvailableBlocks();

return availableBlocks * blockSize;

}

用以上两个方法，就可以获得内部存储空间总大小和可用大小了。

sdcard外部存储空间

/**

* 判断SD卡是否可用

*

* @return true : 可用
false : 不可用

*/

public static boolean isSDCardEnable() {

return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());

}

/**

* 获取手机外部总空间大小

*

* @return 总大小，字节为单位

*/

static public long getTotalExternalMemorySize() {

if (isSDCardEnable()) {

//获取SDCard根目录

File path = Environment.getExternalStorageDirectory();

StatFs stat = new StatFs(path.getPath());

long blockSize = stat.getBlockSize();

long totalBlocks = stat.getBlockCount();

return totalBlocks * blockSize;

} else {

return -1;

}

}

/**

* 获取SD卡剩余空间

*

* @return SD卡剩余空间

*/

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)

public static String getFreeSpace() {

if (!isSDCardEnable()) return "sdcard unable!";

StatFs stat = new StatFs(getSDCardPath());

long blockSize, availableBlocks;

availableBlocks = stat.getAvailableBlocksLong();

blockSize = stat.getBlockSizeLong();

long size = availableBlocks * blockSize / 1024L;

return String.valueOf(size);

}

统一描述sdcard的信息

/**

* 获取SD卡信息

*

* @return SDCardInfo

*/

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)

public static String getSDCardInfo() {

SDCardInfo sd = new SDCardInfo();

if (!isSDCardEnable()) return "sdcard unable!";

sd.isExist = true;

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

sd.totalBlocks = sf.getBlockCountLong();

sd.blockByteSize = sf.getBlockSizeLong();

sd.availableBlocks = sf.getAvailableBlocksLong();

sd.availableBytes = sf.getAvailableBytes();

sd.freeBlocks = sf.getFreeBlocksLong();

sd.freeBytes = sf.getFreeBytes();

sd.totalBytes = sf.getTotalBytes();

return sd.toString();

}

public static class SDCardInfo {

boolean isExist;

long totalBlocks;

long freeBlocks;

long availableBlocks;

long blockByteSize;

long totalBytes;

long freeBytes;

long availableBytes;

@Override

public String toString() {

return "isExist=" + isExist +

"\ntotalBlocks=" + totalBlocks +

"\nfreeBlocks=" + freeBlocks +

"\navailableBlocks=" + availableBlocks +

"\nblockByteSize=" + blockByteSize +

"\ntotalBytes=" + totalBytes +

"\nfreeBytes=" + freeBytes +

"\navailableBytes=" + availableBytes;

}

}