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Android獲取外部和內部存儲空間總大小
android.os下的StatFs類主要用來獲取文件係統的狀態，能夠獲取sd卡的大小和剩餘空間，獲取係統內部空間也就是/system的大小和剩餘空間等等。
看下讀取sd卡的：
Java代碼
void readSDCard() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
File sdcardDir = Environment.getExternalStorageDirectory();
StatFs sf = new StatFs(sdcardDir.getPath());
long blockSize = sf.getBlockSize();
long blockCount = sf.getBlockCount();
long availCount = sf.getAvailableBlocks();
Log.d("" , "block大小:" + blockSize+ ",block數目:" + blockCount+ ",總大小:" +blockSize*blockCount/ 1024 + "KB" );
Log.d("" , "可用的block數目：:" + availCount+ ",剩餘空間:" + availCount*blockSize/ 1024 + "KB" );
}
}
void readSDCard() {
String state = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED.equals(state)) {
File sdcardDir = Environment.getExternalStorageDirectory();
StatFs sf = new StatFs(sdcardDir.getPath());
long blockSize = sf.getBlockSize();
long blockCount = sf.getBlockCount();
long availCount = sf.getAvailableBlocks();
Log.d("", "block大小:"+ blockSize+",block數目:"+ blockCount+",總大小:"+blockSize*blockCount/1024+"KB");
Log.d("", "可用的block數目：:"+ availCount+",剩餘空間:"+ availCount*blockSize/1024+"KB");
}
} 然後看下讀取係統內部空間的：
Java代碼
void readSystem() {
File root = Environment.getRootDirectory();
StatFs sf = new StatFs(root.getPath());
long blockSize = sf.getBlockSize();
long blockCount = sf.getBlockCount();
long availCount = sf.getAvailableBlocks();
Log.d("" , "block大小:" + blockSize+ ",block數目:" + blockCount+ ",總大小:" +blockSize*blockCount/ 1024 + "KB" );
Log.d("" , "可用的block數目：:" + availCount+ ",可用大小:" + availCount*blockSize/ 1024 + "KB" );
}
void readSystem() {
File root = Environment.getRootDirectory();
StatFs sf = new StatFs(root.getPath());
long blockSize = sf.getBlockSize();
long blockCount = sf.getBlockCount();
long availCount = sf.getAvailableBlocks();
Log.d("", "block大小:"+ blockSize+",block數目:"+ blockCount+",總大小:"+blockSize*blockCount/1024+"KB");
Log.d("", "可用的block數目：:"+ availCount+",可用大小:"+ availCount*blockSize/1024+"KB");
} StatFs獲取的都是以block為單位的，這裏我解釋一下block的概念：
1.硬件上的 block size, 應該是"sector size"，linux的扇區大小是512byte
2.有文件係統的分區的block size, 是"block size"，大小不一，可以用工具查看
3.沒有文件係統的分區的block size，也叫“block size”，大小指的是1024 byte
4.Kernel buffer cache 的block size, 就是"block size"，大部分PC是1024
5.磁盤分區的"cylinder size"，用fdisk 可以查看。
我們這裏的block size是第二種情況，一般SD卡都是fat32的文件係統，block size是4096.
這樣就可以知道手機的內部存儲空間和sd卡存儲空間的總大小和可用大小了。
最後更新：2017-04-02 06:51:56