我有一个带ListView的Activity。我使用Apache FTP Commons连接并使用文件和目录填充ListView。如何确定所选项目是文件还是目录？
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.ftp);
editAddress = (EditText) findViewById(R.id.editAddress);
editUser = (EditText) findViewById(R.id.editUsername);
editPassword = (EditText) findViewById(R.id.editPassword);
remote = (ListView) findViewById(R.id.localList);
itla.setListItems(directoryEntries);
remote.setAdapter(itla);
remote.setOnItemClickListener(this);
connect = (ToggleButton) findViewById(R.id.connectButton);
connect.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
address = editAddress.getText().toString();
user = editUser.getText().toString();
pass = editPassword.getText().toString();
ftpConnect(address, user,pass, 21);
}
});
}
public boolean ftpConnect(String host, String username, String password,
int port) {
try {
mFTPClient = new FTPClient();
// connecting to the host
mFTPClient.connect(host, port);
// now check the reply code, if positive mean connection success
if (FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())) {
// login using username & password
boolean status = mFTPClient.login(username, password);
/*
* Set File Transfer Mode
*
* To avoid corruption issue you must specified a correct
* transfer mode, such as ASCII_FILE_TYPE, BINARY_FILE_TYPE,
* EBCDIC_FILE_TYPE .etc. Here, I use BINARY_FILE_TYPE for
* transferring text, image, and compressed files.
*/
mFTPClient.setFileType(FTP.BINARY_FILE_TYPE);
mFTPClient.enterLocalPassiveMode();
ftpPrintFilesList(ftpGetCurrentWorkingDirectory());
return status;
}
} catch (Exception e) {
// Log.d(TAG, "Error: could not connect to host " + host );
}
return false;
}
public boolean ftpDisconnect() {
try {
mFTPClient.logout();
mFTPClient.disconnect();
return true;
} catch (Exception e) {
// Log.d(TAG,
// "Error occurred while disconnecting from ftp server.");
}
return false;
}
public String ftpGetCurrentWorkingDirectory() {
try {
String workingDir = mFTPClient.printWorkingDirectory();
return workingDir;
} catch (Exception e) {
// Log.d(TAG, "Error: could not get current working directory.");
}
return null;
}
public boolean ftpChangeDirectory(String directory_path) {
try {
return mFTPClient.changeWorkingDirectory(directory_path);
} catch (Exception e) {
// Log.d(TAG, "Error: could not change directory to " +
// directory_path);
}
return false;
}
public void ftpPrintFilesList(String dir_path) {
try {
FTPFile[] ftpFiles = mFTPClient.listFiles(dir_path);
int length = ftpFiles.length;
for (int i = 0; i < length; i++) {
File name = new File(ftpFiles[i].getName());
boolean isFile = ftpFiles[i].isFile();
boolean isDirectory = ftpFiles[i].isDirectory();
if (isDirectory) {
Drawable currentIcon = getResources().getDrawable(
R.drawable.folder);
directoryEntries.add(new IconifiedText(name, currentIcon));
// Log.i(TAG, "File : " + name);
} else if (isFile) {
Drawable currentIcon = getResources().getDrawable(
R.drawable.mimetxt);
directoryEntries.add(new IconifiedText(name, currentIcon));
// Log.i(TAG, "Directory : " + name);
}
Collections.sort(this.directoryEntries);
itla.setListItems(directoryEntries);
remote.setAdapter(itla);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onItemClick(AdapterView<?> adapter, View view, int position,
long id) {
String selectedFile = directoryEntries.get(position).getText();
try {
ftpPrintFilesList(selectedFile);
itla.notifyDataSetChanged();
} catch (NullPointerException e) {
}
Toast.makeText(FTPConnector.this, selectedFile, Toast.LENGTH_LONG)
.show();
}
}
Toast返回正确的文件名。
以下是使用反斜杠建议的完整代码，供任何可能认为有用的人使用。
public class FTPConnector extends Activity implements OnItemClickListener {
public ListView remote;
public ArrayAdapter<String> adapter;
public FTPClient mFTPClient = null;
public ToggleButton connect;
public EditText editAddress;
private String address;
public String currentDirectory = "/";
public EditText editUser;
private String user;
public EditText editPassword;
private String pass;
public File[] fileList;
public HashMap<String, Boolean> map = new HashMap<String, Boolean>();
private List<IconifiedText> directoryEntries = new ArrayList<IconifiedText>();
private IconifiedTextListAdapter itla = new IconifiedTextListAdapter(this);
public String[] files;
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.ftp);
editAddress = (EditText) findViewById(R.id.editAddress);
editUser = (EditText) findViewById(R.id.editUsername);
editPassword = (EditText) findViewById(R.id.editPassword);
remote = (ListView) findViewById(R.id.remoteList);
itla.setListItems(directoryEntries);
remote.setAdapter(itla);
remote.setOnItemClickListener(this);
connect = (ToggleButton) findViewById(R.id.connectButton);
connect.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
address = editAddress.getText().toString();
user = editUser.getText().toString();
pass = editPassword.getText().toString();
ftpConnect(address, user,
pass, 21);
} else {
ftpDisconnect();
directoryEntries.clear();
itla.notifyDataSetChanged();
}
}
});
}
public boolean ftpConnect(String host, String username, String password,
int port) {
try {
mFTPClient = new FTPClient();
// connecting to the host
mFTPClient.connect(host, port);
// now check the reply code, if positive mean connection success
if (FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())) {
// login using username & password
boolean status = mFTPClient.login(username, password);
/*
* Set File Transfer Mode
*
* To avoid corruption issue you must specified a correct
* transfer mode, such as ASCII_FILE_TYPE, BINARY_FILE_TYPE,
* EBCDIC_FILE_TYPE .etc. Here, I use BINARY_FILE_TYPE for
* transferring text, image, and compressed files.
*/
mFTPClient.setFileType(FTP.BINARY_FILE_TYPE);
mFTPClient.enterLocalPassiveMode();
ftpPrintFilesList(ftpGetCurrentWorkingDirectory());
return status;
}
} catch (Exception e) {
// Log.d(TAG, "Error: could not connect to host " + host );
}
return false;
}
public boolean ftpDisconnect() {
try {
mFTPClient.logout();
mFTPClient.disconnect();
return true;
} catch (Exception e) {
// Log.d(TAG,
// "Error occurred while disconnecting from ftp server.");
}
return false;
}
public String ftpGetCurrentWorkingDirectory() {
try {
String workingDir = mFTPClient.printWorkingDirectory();
return workingDir;
} catch (Exception e) {
// Log.d(TAG, "Error: could not get current working directory.");
}
return null;
}
public boolean ftpChangeDirectory(String directory_path) {
try {
return mFTPClient.changeWorkingDirectory(directory_path);
} catch (Exception e) {
// Log.d(TAG, "Error: could not change directory to " +
// directory_path);
}
return false;
}
public void ftpPrintFilesList(String dir_path) {
map.clear();
try {
FTPFile[] ftpFiles = mFTPClient.listFiles(dir_path);
int length = ftpFiles.length;
for (int i = 0; i < length; i++) {
File name = new File(ftpFiles[i].getName());
boolean isFile = ftpFiles[i].isFile();
boolean isDirectory = ftpFiles[i].isDirectory();
if (isDirectory) {
Drawable currentIcon = getResources().getDrawable(
R.drawable.folder);
directoryEntries.add(new IconifiedText(name, currentIcon));
map.put(ftpFiles[i].getName(),
Boolean.valueOf(ftpFiles[i].isDirectory()));
// Log.i(TAG, "File : " + name);
} else if (isFile) {
Drawable currentIcon = getResources().getDrawable(
R.drawable.mimetxt);
directoryEntries.add(new IconifiedText(name, currentIcon));
map.put(ftpFiles[i].getName(),
Boolean.valueOf(ftpFiles[i].isFile()));
// Log.i(TAG, "Directory : " + name);
}
Collections.sort(this.directoryEntries);
itla.setListItems(directoryEntries);
remote.setAdapter(itla);
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onItemClick(AdapterView<?> adapter, View view, int position,
long id) {
String selectedFile = directoryEntries.get(position).getText();
boolean isDirectory = map.get(selectedFile).booleanValue();
if (isDirectory) {
directoryEntries.clear();
itla.notifyDataSetChanged();
ftpPrintFilesList(selectedFile);
} else if (!isDirectory) {
Toast.makeText(FTPConnector.this, selectedFile, Toast.LENGTH_LONG)
.show();
}
}
}
答案 0 :(得分：2)
当您使用Apache Commons Net的FTPClient时，如果列出目录，客户端将向您发送一个FTPFile的数组。每个FTPFile都有isDirectory()和isFile()方法，可以告诉您它是目录还是文件。
Apache Commons FTPFile JavaDoc
所以你基本上需要在列表中找到哪个文件具有所选名称（可能使用getName()函数进行搜索？）然后使用FTPFile类中提供的两种方法之一
<强>更新
试试这个：
声明HashMap实例变量
//this will contain the file name and it's isDirectory() result
HashMap<String, Boolean> map = new HashMap<String, Boolean>();
现在，在ftpPrintFilesList(path)方法的开头：
//resets the map, you are listing new FTPFiles, so older ones need to be removed
map.clear();
然后，在for循环中，在ftpPrintFilesList(path)中将每个FTP文件信息添加到地图中，如下所示：
//Add file's name and isDirectory() value to the map
map.put(ftpFiles[i].getName(),new Boolean(ftpFiles[i].isDirectory()));
最后，在onItemClick方法中，只需使用
boolean isDirectory = map.get(selectedFile).booleanValue();
如果所选项目是目录，则返回true，如果是文件则返回false