android - 获取 Android 上的所有总空间和可用空间

Question

据我所知，在 Android 上，有:

• 应用程序和缓存的内部存储器
• 部分手机内置 SD 卡(不可移动)
• 用于存储音乐和照片的外部 SD 卡(可移动)

我如何通过检查它们是否存在来获得总数和可用量(有些手机没有内置 SD 卡)

谢谢

Answer 1

以下是获取内部存储大小的方法:

 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;

以下是获取外部存储大小(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;

---

简短的笔记

空闲 block :

The total number of blocks that are free on the file system, including reserved blocks (that are not available to normal applications).

可用 block :

The number of blocks that are free on the file system and available to applications.

---

检测SD卡是否挂载的方法如下:

 String state = Environment.getExternalStorageState();
 if (Environment.MEDIA_MOUNTED.equals(state)) 
 {
   // We can read and write the media    
 } 
 else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) 
 {
    // We can only read the media     
 } 
 else 
 {
    // No external media
 }