我知道很多问题已经得到解答， 但在我的情况下，我的代码在Oppo，三星手机上正常工作但在MI，MOto G，Lenavo手机上无法正常工作
这是我的代码：
辅助SD卡的字符串返回路径：
public static String getExternalStorage() {
File rootFolder = new File("/");
boolean isSdcardRemovable = false;
String path = null;
/* loop: */
for (int i = 0; i < rootFolder.listFiles().length; i++) {
if (rootFolder.listFiles()[i].listFiles() != null
&& !rootFolder.listFiles()[i].toString().contains("system")
&& !rootFolder.listFiles()[i].toString().contains("etc")
&& !rootFolder.listFiles()[i].toString().contains("dev")) {
File dataDir = new File(Environment.getDataDirectory()
.getAbsolutePath());
long dataDirSize = dataDir.getFreeSpace() / (1000 * 1000);
long folderSize = rootFolder.listFiles()[i].getFreeSpace()
/ (1000 * 1000);
if (dataDirSize == folderSize
|| (dataDirSize > folderSize && folderSize > (dataDirSize - 80))) {
System.err
.println("INTERNAL1 " + rootFolder.listFiles()[i]);
System.err.println(dataDirSize);
System.err.println(folderSize);
} else {
File rootSubFolder1 = new File(
rootFolder.listFiles()[i].getAbsolutePath());
if (rootSubFolder1.listFiles() != null) {
for (int j = 0; j < rootSubFolder1.listFiles().length; j++) {
if (rootSubFolder1.listFiles()[j].getTotalSpace() != 0
&& rootSubFolder1.listFiles()[j]
.getFreeSpace() != 0
&& rootSubFolder1.listFiles()[j]
.listFiles() != null) {
Debug.i("fromGetExternalStorage", ""
+ rootSubFolder1.listFiles()[j]);
if (rootSubFolder1.listFiles()[j].toString()
.contains("sdcard")
|| rootSubFolder1.listFiles()[j]
.toString().contains("storage")
|| rootSubFolder1.listFiles()[j]
.toString().contains("mnt")) {
folderSize = rootSubFolder1.listFiles()[j]
.getFreeSpace() / (1000 * 1000);
if (dataDirSize == folderSize
|| (dataDirSize > folderSize && folderSize > (dataDirSize - 80))) {
System.err
.println("INTERNAL2 "
+ rootSubFolder1
.listFiles()[j]);
System.err.println(dataDirSize);
System.err.println(folderSize);
} else {
int pos = rootSubFolder1.listFiles()[j]
.getAbsolutePath().lastIndexOf(
'/');
String str = rootSubFolder1.listFiles()[j]
.getAbsolutePath().substring(
pos + 1);
if (str.matches("(sd|ext|3039|m_external_sd).*")) {
isSdcardRemovable = true;
System.err.println("EXTERNAL "
+ rootSubFolder1
.listFiles()[j]);
System.err.println(dataDirSize);
System.err.println(folderSize);
path = rootSubFolder1.listFiles()[j]
.getAbsolutePath() + "/";
break loop;
}
}
}
}
}
}
}
}
}
if (isSdcardRemovable) {
if (path != null) {
Debug.i("new Path from getExternal Storage", path);
} else {
Debug.i("fail", "External memory not found.");
}
} else {
Debug.i("fail", "External memory not available.");
}
return path;
}`
此代码我使用路径和复制文件：
OutputStream OS = new FileOutputStream（path + File.separator +“name.txt”）;
答案 0 :(得分：0)
首先制作目录
File wallpaperDirectory = new File("sdcard/Youpath/");
// have the object build the directory structure, if needed.
if(!wallpaperDirectory.exists()) {
wallpaperDirectory.mkdirs();
}
要复制的代码
final int[] mList= new int[] { R.raw.a, R.raw.b, R.raw.c,R.raw.d,R.raw.e,R.raw.f,
R.raw.g,R.raw.h,R.raw.i,R.raw.j,R.raw.k,R.raw.l,R.raw.m,R.raw.n,R.raw.o,R.raw.p,R.raw.q
,R.raw.r,R.raw.s,R.raw.t,R.raw.u};
for (int i = 0; i < mList.length; i++) {
try {
String path = "sdcard/Youpath/";
File dir = new File(path);
if (dir.mkdirs() || dir.isDirectory()) {
String mName= "YourSetName"+ String.valueOf(i+1) + ".extension";
CopyRAWtoSDCard(mList[i], path + File.separator + mName);
}
} catch (IOException e) {
e.printStackTrace();
}
}
CopyRAWtoSDCard功能
private void CopyRAWtoSDCard(int id, String path) throws IOException {
InputStream in = getResources().openRawResource(id);
FileOutputStream out = new FileOutputStream(path);
byte[] buff = new byte[1024];
int read = 0;
try {
while ((read = in.read(buff)) > 0) {
out.write(buff, 0, read);
}
} finally {
in.close();
out.close();
}
}