怎么往外置sd卡中写入数据
如何往外置sd卡中写入数据
在学习android开发 看了老罗的视频
结果是如果用Environment.getExternalStorageDirectory()获取sd卡路径存入文件后文件都是写入到的自带的内置内存卡中，
然后输入这个路径后得到的是/storage/sdcard0
就想咨询一下 难道Environment.getExternalStorageDirectory()获取外置内存卡的路径而是内置内存卡路径？
如果如此的话那如何往外置内存卡中写入文件？
做测试用的机器是三星的平板
------解决思路----------------------
在学习android开发 看了老罗的视频
结果是如果用Environment.getExternalStorageDirectory()获取sd卡路径存入文件后文件都是写入到的自带的内置内存卡中，
然后输入这个路径后得到的是/storage/sdcard0
就想咨询一下 难道Environment.getExternalStorageDirectory()获取外置内存卡的路径而是内置内存卡路径？
如果如此的话那如何往外置内存卡中写入文件？
做测试用的机器是三星的平板
------解决思路----------------------
package com.cshis.DGRHotel.SDCardReader;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import com.cshis.DGRHotel.SDCardReader.Dev_MountInfo.DevInfo;
import android.os.Environment;
/**
* 取外置SD卡路径类
* @author WangYimin
*
*/
public class Dev_MountInfo implements IDev {
/**
* ***
*/
public final String HEAD = "dev_mount";
public final String LABEL = "<label>";
public final String MOUNT_POINT = "<mount_point>";
public final String PATH = "<part>";
public final String SYSFS_PATH = "<sysfs_path1...>";
/**
* Label for the volume
*/
private final int NLABEL = 1;
/**
* Partition
*/
private final int NPATH = 2;
/**
* Where the volume will be mounted
*/
private final int NMOUNT_POINT = 3;
private final int NSYSFS_PATH = 4;
private final int DEV_INTERNAL = 0;
private final int DEV_EXTERNAL = 1;
private ArrayList<String> cache = new ArrayList<String>();
private static Dev_MountInfo dev;
private DevInfo info;
private final File VOLD_FSTAB = new File(Environment.getRootDirectory()
.getAbsoluteFile()
+ File.separator
+ "etc"
+ File.separator
+ "vold.fstab");
public static Dev_MountInfo getInstance() {
if (null == dev)
dev = new Dev_MountInfo();
return dev;
}
private DevInfo getInfo(final int device) {
// for(String str:cache)
// System.out.println(str);
if (null == info)
info = new DevInfo();
try {
initVoldFstabToCache();
} catch (IOException e) {
e.printStackTrace();
}
if (device >= cache.size())
return null;
String[] sinfo = cache.get(device).split(" ");
info.setLabel(sinfo[NLABEL]);
info.setMount_point(sinfo[NMOUNT_POINT]);
info.setPath(sinfo[NPATH]);
info.setSysfs_path(sinfo[NSYSFS_PATH]);
return info;
}
/**
* init the words into the cache array
* @throws IOException
*/
private void initVoldFstabToCache() throws IOException {
cache.clear();
BufferedReader br = new BufferedReader(new FileReader(VOLD_FSTAB));
String tmp = null;
while ((tmp = br.readLine()) != null) {
// the words startsWith "dev_mount" are the SD info
if (tmp.startsWith(HEAD)) {
cache.add(tmp);
}
}
br.close();
cache.trimToSize();
}
public class DevInfo {
private String label, mount_point, path, sysfs_path;
/**
* return the label name of the SD card
* @return
*/
public String getLabel() {
return label;
}
private void setLabel(String label) {
this.label = label;
}
/**
* the mount point of the SD card
* @return
*/
public String getMount_point() {
return mount_point;
}
private void setMount_point(String mount_point) {
this.mount_point = mount_point;
}
/**
* SD mount path
* @return
*/
public String getPath() {
return path;
}
private void setPath(String path) {
this.path = path;
}
/**
* "unknow"
* @return
*/
public String getSysfs_path() {
return sysfs_path;
}
private void setSysfs_path(String sysfs_path) {
this.sysfs_path = sysfs_path;
}
}
@Override
public DevInfo getInternalInfo() {
return getInfo(DEV_INTERNAL);
}
@Override
public DevInfo getExternalInfo() {