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我目前正在開發一個應用程序，在該應用程序中顯示關於它所安裝的設備的各種不同統計信息。其中一個統計數據被使用/ SD卡的總空間。我得到它的答案發現Here和Here。Android內部SD卡大小不返回「true」大小
事情是，我相信無論如何，沒有root權限，它不會返回內部（模擬）SD卡的「真實」值。下面是一些代碼：
如何獲取Sd中的位置（S）和大小（S）：
new StorageUtils();
ArrayList<StorageInfo> storageInfoList = StorageUtils.getStorageList();
if (storageInfoList.size() > 0) {
tvStorageAName = (TextView) findViewById(R.id.tvStorageAName);
tvStorageAName.setText(storageInfoList.get(0).path);
devStorageA = StorageUtils.getReadableFileSize(
(StorageUtils.getUsedSpace(storageInfoList.get(0).path)),
true)
+ "/"
+ StorageUtils.getReadableFileSize((StorageUtils
.getTotalSpace(storageInfoList.get(0).path)), true);
if (storageInfoList.size() > 1) {
tvStorageBName = (TextView) findViewById(R.id.tvStorageBName);
tvStorageBName.setText(storageInfoList.get(1).path);
devStorageB = StorageUtils.getReadableFileSize(
StorageUtils.getUsedSpace(storageInfoList.get(1).path)
+ (StorageUtils.getUsedSpace("system/")), true)
+ "/"
+ StorageUtils.getReadableFileSize((StorageUtils
.getTotalSpace(storageInfoList.get(1).path)),
true);
} else {
devStorageB = "N/A";
}
} else {
devStorageA = "N/A";
devStorageB = "N/A";
}
我StorageUtils類：
public class StorageUtils {
private static final String TAG = "StorageUtils";
public static class StorageInfo {
public final String path;
public final boolean internal;
public final boolean readonly;
public final int display_number;
StorageInfo(String path, boolean internal, boolean readonly,
int display_number) {
this.path = path;
this.internal = internal;
this.readonly = readonly;
this.display_number = display_number;
}
}
public static ArrayList<StorageInfo> getStorageList() {
ArrayList<StorageInfo> list = new ArrayList<StorageInfo>();
String def_path = Environment.getExternalStorageDirectory().getPath();
boolean def_path_internal = !Environment.isExternalStorageRemovable();
String def_path_state = Environment.getExternalStorageState();
boolean def_path_available = def_path_state
.equals(Environment.MEDIA_MOUNTED)
|| def_path_state.equals(Environment.MEDIA_MOUNTED_READ_ONLY);
boolean def_path_readonly = Environment.getExternalStorageState()
.equals(Environment.MEDIA_MOUNTED_READ_ONLY);
BufferedReader buf_reader = null;
try {
HashSet<String> paths = new HashSet<String>();
buf_reader = new BufferedReader(new FileReader("/proc/mounts"));
String line;
int cur_display_number = 1;
Log.d(TAG, "/proc/mounts");
while ((line = buf_reader.readLine()) != null) {
Log.d(TAG, line);
if (line.contains("vfat") || line.contains("/mnt")) {
StringTokenizer tokens = new StringTokenizer(line, " ");
String unused = tokens.nextToken(); // device
String mount_point = tokens.nextToken(); // mount point
if (paths.contains(mount_point)) {
continue;
}
unused = tokens.nextToken(); // file system
List<String> flags = Arrays.asList(tokens.nextToken()
.split(",")); // flags
boolean readonly = flags.contains("ro");
if (mount_point.equals(def_path)) {
paths.add(def_path);
list.add(new StorageInfo(def_path, def_path_internal,
readonly, -1));
} else if (line.contains("/dev/block/vold")) {
if (!line.contains("/mnt/secure")
&& !line.contains("/mnt/asec")
&& !line.contains("/mnt/obb")
&& !line.contains("/dev/mapper")
&& !line.contains("tmpfs")) {
paths.add(mount_point);
list.add(new StorageInfo(mount_point, false,
readonly, cur_display_number++));
}
}
}
}
if (!paths.contains(def_path) && def_path_available) {
list.add(new StorageInfo(def_path, def_path_internal,
def_path_readonly, -1));
}
} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
} finally {
if (buf_reader != null) {
try {
buf_reader.close();
} catch (IOException ex) {
}
}
}
return list;
}
public static String getReadableFileSize(long bytes, boolean si) {
int unit = si ? 1000 : 1024;
if (bytes < unit)
return bytes + " B";
int exp = (int) (Math.log(bytes)/Math.log(unit));
String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1)
+ (si ? "" : "i");
return String.format("%.1f %sB", bytes/Math.pow(unit, exp), pre);
}
@SuppressLint("NewApi")
public static long getFreeSpace(String path) {
StatFs statFs = new StatFs(path);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
long sdAvailSize = statFs.getFreeBlocksLong()
* statFs.getBlockSizeLong();
return sdAvailSize;
} else {
@SuppressWarnings("deprecation")
double sdAvailSize = (double) statFs.getFreeBlocks()
* (double) statFs.getBlockSize();
return (long) sdAvailSize;
}
}
public static long getUsedSpace(String path) {
return getTotalSpace(path) - getFreeSpace(path);
}
@SuppressLint("NewApi")
public static long getTotalSpace(String path) {
StatFs statFs = new StatFs(path);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
long sdTotalSize = statFs.getBlockCountLong()
* statFs.getBlockSizeLong();
return sdTotalSize;
} else {
@SuppressWarnings("deprecation")
double sdTotalSize = (double) statFs.getBlockCount()
* statFs.getBlockSize();
return (long) sdTotalSize;
}
}
}
的問題是我猜，這是獲得這些大小（沒有root權限）的最準確的方法，還是有更好的方法來做到這一點？任何和所有的幫助非常感謝，感謝您花時間閱讀本文！
編輯：外部SD卡並沒有給我一個問題。內部SD卡（也似乎是數據/目錄）沒有顯示總計。它在我的測試設備上缺少〜5Gb。有任何想法嗎？
編輯2：我有一個朋友測試他們的電話，內部顯示36.0 GB（已用）/ 8.6 GB（總計），爲什麼這會返回這樣的零星結果？一個應用程序如何說文件管理器返回結果？
模擬卷不具有** a *真*「大小」，因爲在使用該塊和使用同一塊塊用於其他目的之間存在權衡。仿真層可能會強加一個人爲限制，但這也不是真正的大小。 –
感謝您的回覆。我在他們的手機上進行了朋友測試，內部顯示36.0 GB（使用）/ 8.6 GB（總計）。似乎會有辦法獲得更好的結果，有什麼想法？感謝您的時間。 – MattMatt