本人博客原文
getExternalStorageDirectory() 这个节点上,而对于真正的外部sdcard挂载到了"/mnt/sdcard2"这个节点上。另外/system/etc/vold.fstab文件中描述了SDcard的挂载点，我们可以读取它来得到关于SD card的挂载点信息。
getExternalStorageDirectory() 这个节点上，其次是"/mnt/sdcard2"这个节点上，再次是"/mnt/emmc"，再次考虑/system/etc/vold.fstab文件中的挂载点，最后才是手机的内部存储(即“/data”区域）。getExternalStorageDirectory() 这个节点上，或是"/mnt/sdcard2"这个节点上，或是是"/mnt/emmc"。但是其实做两次检查应该没有什么副作用，由于对于读取/system/etc/vold.fstab文件来得到描述SDcard的挂载点这个事情似乎不是一个官方的做法；我就把它放在了更低的优先级。
-l看到该文件对别的应用程序来说其实已经有读的权限，但是别的应用程序实际上还是无法读取这些。这时我们需要在创建该文件的应用程序中对getFilesDir()目录执行"chmod
705"的操作来解决该问题。
package cn.edu.cdut.robin;import java.io.File;import java.io.IOException;import android.content.Context;import android.os.Environment;import android.os.StatFs;import android.text.TextUtils;public class AppUtil {static Context context;static void init(Context cxt)
{
context = cxt;
}/** get external Storage available space */
public static long getExternaltStorageAvailableSpace()
{
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED))
{
return 0;
}
File path = Environment.getExternalStorageDirectory();
StatFs statfs = new StatFs(path.getPath());
long blockSize = statfs.getBlockSize();
long availableBlocks = statfs.getAvailableBlocks();
return blockSize * availableBlocks;
}/** get external Storage available space */
public static long getExternaltStorageTotalSpace()
{
File path = Environment.getExternalStorageDirectory();
StatFs statfs = new StatFs(path.getPath());
long blockSize = statfs.getBlockSize();
long totalBlocks = statfs.getBlockCount();
return blockSize * totalBlocks;
}/** get sdcard2 external Storage available space */
public static long getSdcard2StorageAvailableSpace()
{
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED))
{
return 0;
}
String path = getSdcard2StorageDirectory();
File file = new File(path);
if (!file.exists())
return 0;
StatFs statfs = new StatFs(path);
long blockSize = statfs.getBlockSize();
long availableBlocks = statfs.getAvailableBlocks();
return blockSize * availableBlocks;
}/** get sdcard2 external Storage total space */
public static long getSdcard2StorageTotalSpace()
{
String path = getSdcard2StorageDirectory();
File file = new File(path);
if (!file.exists())
return 0;
StatFs statfs = new StatFs(path);
long blockSize = statfs.getBlockSize();
long totalBlocks = statfs.getAvailableBlocks();
return blockSize * totalBlocks;
}/** get EMMC internal Storage available space */
public static long getEmmcStorageAvailableSpace()
{
String path = getEmmcStorageDirectory();
File file = new File(path);
if (!file.exists())
return 0;
StatFs statfs = new StatFs(path);
long blockSize = statfs.getBlockSize();
long availableBlocks = statfs.getAvailableBlocks();return blockSize * availableBlocks;
}/** get EMMC internal Storage available space */
public static long getEmmcStorageTotalSpace()
{
String path = getEmmcStorageDirectory();
File file = new File(path);
if (!file.exists())
return 0;
StatFs statfs = new StatFs(path);
long blockSize = statfs.getBlockSize();
long totalBlocks = statfs.getBlockCount();return blockSize * totalBlocks;
}
static FstabReader fsReader =null;
/** get other external Storage available space*/
public static long getOtherExternaltStorageAvailableSpace() {
if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
return 0;
}
if(otherExternalStorageState==kOtherExternalStorageStateUnable)
return 0;
if(otherExternalStorageDirectory==null)
{
getOtherExternalStorageDirectory();
}
if(otherExternalStorageDirectory==null)
return 0;
StatFs statfs = new StatFs(otherExternalStorageDirectory);
long blockSize = statfs.getBlockSize();
long availableBlocks = statfs.getAvailableBlocks();
return blockSize * availableBlocks;
}
private static String otherExternalStorageDirectory=null;
private static int kOtherExternalStorageStateUnknow=-1;
private static int kOtherExternalStorageStateUnable=0;
private static int kOtherExternalStorageStateIdle=1;
private static int otherExternalStorageState=kOtherExternalStorageStateUnknow;
public static String getOtherExternalStorageDirectory()
{
if(otherExternalStorageState==kOtherExternalStorageStateUnable)
return null;
if(otherExternalStorageState==kOtherExternalStorageStateUnknow)
{
FstabReader fsReader = new FstabReader();
if(fsReader.size()<=0)
{
otherExternalStorageState=kOtherExternalStorageStateUnable;
return null;
}
List<StorageInfo> storages = fsReader.getStorages();
/*对于可用空间小于100M的挂载节点忽略掉*/
long availableSpace=100<<(20);
String path=null;
for(int i=0;i<storages.size();i++)
{
StorageInfo info=storages.get(i);
if(info.getAvailableSpace()>availableSpace){
availableSpace=info.getAvailableSpace();
path=info.getPath();
}
}
otherExternalStorageDirectory=path;
if(otherExternalStorageDirectory!=null){
otherExternalStorageState=kOtherExternalStorageStateIdle;
}
else {
otherExternalStorageState=kOtherExternalStorageStateUnable;
}
}
return otherExternalStorageDirectory;
}
public static long getInternalStorageAvailableSpace()
{
String path = getInternalStorageDirectory();
StatFs stat = new StatFs(path);
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return blockSize * availableBlocks;
}/**
* 获取手机内部总的存储空间
*
* @return
*/
public static long getInternalStorageTotalSpace()
{
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
return totalBlocks * blockSize;
}public final static String getExternalStorageDirectory()
{
return Environment.getExternalStorageDirectory() + File.separator + "";
}public final static String getExternalStoragePublicDirectory(String type)
{
return Environment.getExternalStoragePublicDirectory(type)
.getAbsolutePath();
}public final static String getSdcard2StorageDirectory()
{
return "/mnt/sdcard2";
}public final static String getEmmcStorageDirectory()
{
return "/mnt/emmc";
}private static String externalStoragePrivateDirectory;
static String getExternalPrivateFilesDirectory()
{
if (externalStoragePrivateDirectory == null)
externalStoragePrivateDirectory = context.getExternalFilesDir(null)
.getAbsolutePath();
return externalStoragePrivateDirectory;
}private static String internalStorageDirectory;
public final static String getInternalStorageDirectory()
{
if (TextUtils.isEmpty(internalStorageDirectory))
{
File file = context.getFilesDir();
internalStorageDirectory = file.getAbsolutePath();
if (!file.exists())
file.mkdirs();
String shellScript = "chmod 705 " + internalStorageDirectory;
runShellScriptForWait(shellScript);
}
return internalStorageDirectory;
}public static boolean isInternalStoragePath(String path)
{
String rootPath = getInternalStorageDirectory();
if (path != null && path.startsWith(rootPath))
return true;
return false;
}public
作者: nameless
- 该日志由 nameless 于11年前发表在综合分类下，最后更新于 2013年07月04日.
- 转载请注明: Android中一些数据存储函数的封装 | 学步园 +复制链接
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