到目前为止，我可以通过编程方式将文件从手机的内存复制到连接到它的USB-OTG。我只需要授予root权限并编辑platform.xml。但现在我的设备（三星Galaxy S6 Edge +）已经更新到Android 6并使我的代码停止工作。 我每次尝试按照以前的方式复制文件时都会收到此错误：
由java.lang.RuntimeException引起：java.io.FileNotFoundException：/ mnt / media_rw / 4265-1803 / requiredfiles / Oculus / 360Photos / Pisos / Chalet Anna / R0010008.JPG：open failed：EACCES（Permission denied）< / p>
String from = Environment.getExternalStorageDirectory() + File.separator + getString(R.string.FOLDER_SDCARD);
String to = Utils.getUsbPath() + File.separator + getString(R.string.FOLDER_USB);
FileManager fileManager = new FileManager(getActivity(), from, to, false);
fileManager.execute(true);
我的getUsbPath函数
public static String getUsbPath() {
String finalpath = null;
try {
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec("mount");
InputStream is = proc.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
String line;
String[] patharray = new String[10];
int i = 0;
int available = 0;
BufferedReader br = new BufferedReader(isr);
while ((line = br.readLine()) != null) {
String mount = new String();
if (line.contains("secure"))
continue;
if (line.contains("asec"))
continue;
if (line.contains("fat")) {// TF card
String columns[] = line.split(" ");
if (columns != null && columns.length > 1) {
mount = mount.concat(columns[1] + "/requiredfiles");
patharray[i] = mount;
i++;
// check directory is exist or not
File dir = new File(mount);
if (dir.exists() && dir.isDirectory()) {
// do something here
available = 1;
finalpath = mount;
break;
} else {
}
}
}
}
if (available == 1) {
} else if (available == 0) {
finalpath = patharray[0];
}
} catch (Exception e) {
}
return finalpath;
}
我的FileManager.class
public class FileManager extends AsyncTask<Boolean, Integer, Boolean> {
private Context context;
private String from;
private String to;
private ProgressDialog progressDialog;
private int filesCount=0;
private int filesTotal=0;
Boolean completed;
Boolean move;
MainActivity main;
public static final String TAG = "FileManager";
public FileManager(Context context, String from, String to, Boolean move) {
this.context = context;
this.from = from;
this.to = to;
this.move = move;
this.main = (MainActivity) context;
}
@Override
protected Boolean doInBackground(Boolean... params) {
File source = new File(from);
File target = new File(to);
try {
countFiles(source);
copyDirectory(source, target);
if (move) {
deleteFiles(source);
}
completed = true;
} catch (Exception error) {
Log.e(TAG, "doInBackground", error);
completed = false;
try {
throw error;
} catch (IOException e) {
e.printStackTrace();
}
throw new RuntimeException(error.toString());
}
return null;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(context);
if (move) {
progressDialog.setMessage(context.getString(R.string.moving_files));
} else {
progressDialog.setMessage(context.getString(R.string.copying_files));
}
progressDialog.setIndeterminate(true);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setCancelable(false);
progressDialog.show();
}
@Override
protected void onPostExecute(Boolean aBoolean) {
super.onPostExecute(aBoolean);
progressDialog.dismiss();
if (completed) {
if (move) {
Snackbar.make(main.findViewById(R.id.frame_layout), context.getString(R.string.move_completed), Snackbar.LENGTH_LONG).show();
} else {
Snackbar.make(main.findViewById(R.id.frame_layout), context.getString(R.string.copy_completed), Snackbar.LENGTH_LONG).show();
}
} else {
if (move) {
Snackbar.make(main.findViewById(R.id.frame_layout), context.getString(R.string.move_failed), Snackbar.LENGTH_LONG).show();
} else {
Snackbar.make(main.findViewById(R.id.frame_layout), context.getString(R.string.copy_failed), Snackbar.LENGTH_LONG).show();
}
}
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
progressDialog.setIndeterminate(false);
progressDialog.setMax(filesTotal);
progressDialog.setProgress(filesCount);
}
private void copyDirectory(File sourceLocation, File targetLocation) throws IOException {
if (sourceLocation.isDirectory()) {
if (!targetLocation.exists()) {
targetLocation.mkdirs();
}
String[] children = sourceLocation.list();
for (int i = 0; i < sourceLocation.listFiles().length; i++) {
copyDirectory(new File(sourceLocation, children[i]), new File(targetLocation, children[i]));
}
} else {
if (!targetLocation.exists()) {
filesCount++;
publishProgress();
InputStream in = new FileInputStream(sourceLocation);
OutputStream out = new FileOutputStream(targetLocation);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
scanFile(targetLocation.getCanonicalPath(), false);
}
}
}
private void countFiles(File file) {
if (file.isDirectory()) {
String[] children = file.list();
for (int i = 0; i < file.listFiles().length; i++) {
countFiles(new File(file, children[i]));
}
} else {
filesTotal++;
}
}
public void deleteFiles(File folder) {
if (folder.isDirectory()) {
File[] list = folder.listFiles();
if (list != null) {
for (int i = 0; i < list.length; i++) {
File tmpF = list[i];
if (tmpF.isDirectory()) {
deleteFiles(tmpF);
}
tmpF.delete();
String path;
try {
path = tmpF.getCanonicalPath();
} catch (Exception error) {
Log.e(TAG, "", error);
path = tmpF.getAbsolutePath();
}
scanFile(path, true);
}
}
}
}
private void scanFile(String path, final boolean isDelete) {
try {
MediaScannerConnection.scanFile(context, new String[] { path },
null, new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
if (isDelete) {
if (uri != null) {
context.getContentResolver().delete(uri,
null, null);
}
}
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
}
我该如何解决？