How to identify the end of the file to read?

I write a file browser application, but then read some files folder have more time will be required to yo very long time, I would like to have time to click on the folder to add a progressdialog, but does not know how to determine the file has been read end and close this dialog, seeking expert guidance.<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
Reply:
Read the stream, if it is to return NULL character stream generally said to read the end.
If the bytes read, -1 is generally the end.

 public static String readFileContent (String absPath) throws IOException {
File file = new File (absPath); 
if (file.exists ()) {
BufferedReader bw = new BufferedReader (new FileReader (file)); 
StringBuffer sb = new StringBuffer (); 
String line = null; 
while ((line = bw.readLine ())! = null) {
sb.append (line); 
} 
bw.close (); 
return sb.toString (); 
} 
return null; 
} 

 public static byte [] readInputStreamByte (InputStream ins) {
if (ins == null) {
return null; 
} 
BufferedInputStream bis = new BufferedInputStream (ins); 
ByteArrayOutputStream bos = new ByteArrayOutputStream (); 
try {
byte [] buffer = new byte [128]; 
int n = -1; 
while ((n = bis.read (buffer))! = -1) {
bos.write (buffer, 0, n); 
} 
} Catch (IOException e) {
e.printStackTrace (); 
return null; 
} Finally {
if (bis! = null) {
try {
bis.close (); 
} Catch (IOException e) {
e.printStackTrace (); 
} 
} 
} 
return bos.toByteArray (); 
} 

Reply:
If you are one of the files, go to the list of file size, and then determine whether it is the last file. This good deal.
Reply:

reference to the second floor birdsaction reply:

if one is a list of file size, go file, and then determine whether it is the last file. This good deal.

Read a file, and now I practice

 protected void onListItemClick (ListView l, View v, int position, long id) {
File file = new File (paths.get (position)); 
currentlist.clear (); 
currentlist.addAll (paths); 
/ / Currentlist = paths; 

if (file.isDirectory ()) {
showDialog (DATAREADING); 

item_position_selected = getListView () getSelectedItemPosition ();. 
item_position_first = getListView () getFirstVisiblePosition ();. 
View cv = getListView () getChildAt (item_position_selected - item_position_first);. 
if (cv! = null) {
fromtop_piexl = cv.getTop (); 
} 
BrowserFile (paths.get (position)); 
if (! listFiles.isEmpty ()) {
fileDirectory_position_selected.add (item_position_selected); 
fileDirectory_position_piexl.add (fromtop_piexl); 
pathLevel + +; 
} 
} 

Now like to read the file list is displayed after the pop-up dialog ~
Reply:
Is the need to add a process for processing the file to read it
Reply:

references, 4th Floor abel_liu reply:

is a need to add a process for processing the file to read it

Is certainly needed, even after reading the thread has finished reading, the last face you perform in threaded code, add a message handler can be
Reply:
Thread reads the file, and then read over, informs about the UI thread with close Dialog.
new Thread () {
public void run () {
int n = FileUtils.Process () ;/ / assume that such treatment
if (n == 0) {/ / properly processed
handler.sendEmptyMessage (0); / / has finished processing, send the message.
}
}
}. Start ()
Reply:
5th Floor, positive solutions
Reply:
Why phenomenon is to show the file list and then display progressDialog it, if the thread is in onClickListener inside plus it?
Reply:

reference to the 6th floor birdsaction reply:

thread reads the file, and then read over, informs about the UI thread with close Dialog
.new Thread () {
public void run () {
int n = FileUtils.Process () ;/ / assume that such treatment
if (n == 0) {/ / properly processed
handler.sendEmptyMessage (0); / / has finished processing, send the message.
}
}
}. Start ()

I call progressDialog time to deal with how to operate it in the background file read
Reply:
/ / Dialog is only displayed to the user to improve the experience, and file manipulation okay
Dialog progressDialog = new ProgressDialog (this);
progressDialog.show ();
new Thread () {
public void run () {
int n = FileUtils.Process () ;/ / assume that such treatment
if (n == 0) {/ / properly processed
handler.sendEmptyMessage (0); / / has finished processing, send the message. Dialog is closed to stop processed.
}
}
}. Start ()
Reply:
Get a File object folder when its not there listFiles method returns a Files [] array of objects with a length property it is not know how many files in this folder it? Know the total number, do not know when reading is completed?
Reply:
Thank you for your help, with the thread load, blocked prgressDiaolog realized. Results posted