Transfer App to Samsung Galaxy Tab issue

I have been developing an application on the HTC desire. It runs fine. The application when a button is clicked downloads a file from the my web server and saves it onto the SD card.

I now want to run this application on my Samsung Galaxy Tab. However, is crashes when i click on the button.

The only reason i can see is that the tab is not allowing access to the SD Card. It is the same SD Card i had in the HTC Deisre phone and it is not write protected or anything?

Anyone know what can be wrong?

This is the code i am using to download a file and store it on the card...

 class CreatefilesTask extends AsyncTask<Object, Integer, Boolean> {
    protected Boolean doInBackground(Object... arg0) {
        try{
            URL url  = new URL("http://213.143.36.32/file.csv");
            URLConnection conexion = url.openConnection();
            conexion.connect();
            int lenghtOfFile = conexion.getContentLength();
            InputStream is = url.openStream();
            File testDirectory = 
            new File(Environment.getExternalStorageDirectory()+"/File");
            if(!testDirectory.exists()){
                testDirectory.mkdir();
            }
            FileOutputStream fos = new FileOutputStream(testDirectory+"/file.csv");
            byte data[] = new byte[1024];
            int count = 0;
            long total = 0;
            int progress = 0;
            while ((count=is.read(data)) != -1){
                total += count;
                int progress_temp = (int)total*100/lenghtOfFile;
                if(progress_temp%10 == 0 && progress != progress_temp){
                    progress = progress_temp;
                }
                fos.write(data, 0, count);
            }
            is.close();
            fos.close();
        }
        catch(Exception e){
            e.printStackTrace();
        }

This works fine on the Desire.

StackTrace..

03-31 12:45:07.823: INFO/PowerManagerService(2494): Ulight 3->7|0
03-31 12:45:07.831: VERBOSE/WindowManager(2494): Delivering toWindow{48419208 com.android.qservices/com.android.qservices.AdminActivity paused=false}
03-31 12:45:07.898: VERBOSE/WindowManager(2494): Delivering toWindow{48419208 com.android.qservices/com.android.qservices.AdminActivity paused=false}
03-31 12:45:08.261: WARN/System.err(5314): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-31 12:45:08.261: WARN/System.err(5314):     at android.os.Handler.<init>(Handler.java:121)
03-31 12:45:08.265: WARN/System.err(5314):     at android.widget.Toast.<init>(Toast.java:77)
03-31 12:45:08.265: WARN/System.err(5314):     at android.widget.Toast.makeText(Toast.java:266)
03-31 12:45:08.269: WARN/System.err(5314):     at com.android.qservices.AdminActivity$CreatefilesTask.doInBackground(AdminActivity.java:117)
03-31 12:45:08.269: WARN/System.err(5314):     at com.android.qservices.AdminActivity$CreatefilesTask.doInBackground(AdminActivity.java:1)
03-31 12:45:08.269: WARN/System.err(5314):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-31 12:45:08.269: WARN/System.er开发者_如何学Cr(5314):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-31 12:45:08.273: WARN/System.err(5314):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-31 12:45:08.273: WARN/System.err(5314):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
03-31 12:45:08.273: WARN/System.err(5314):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
03-31 12:45:08.273: WARN/System.err(5314):     at java.lang.Thread.run(Thread.java:1096)
03-31 12:45:08.280: WARN/System.err(5314): java.io.FileNotFoundException: /mnt/sdcard/File/file.csv (No such file or directory)
03-31 12:45:08.284: WARN/System.err(5314):     at org.apache.harmony.luni.platform.OSFileSystem.openImpl(Native Method)
03-31 12:45:08.284: WARN/System.err(5314):     at org.apache.harmony.luni.platform.OSFileSystem.open(OSFileSystem.java:152)
03-31 12:45:08.288: WARN/System.err(5314):     at java.io.FileInputStream.<init>(FileInputStream.java:82)
03-31 12:45:08.288: WARN/System.err(5314):     at com.android.qservices.AdminActivity$CreatefilesTask.doInBackground(AdminActivity.java:148)
03-31 12:45:08.288: WARN/System.err(5314):     at com.android.qservices.AdminActivity$CreatefilesTask.doInBackground(AdminActivity.java:1)
03-31 12:45:08.288: WARN/System.err(5314):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-31 12:45:08.292: WARN/System.err(5314):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-31 12:45:08.292: WARN/System.err(5314):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-31 12:45:08.292: WARN/System.err(5314):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
03-31 12:45:08.296: WARN/System.err(5314):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
03-31 12:45:08.296: WARN/System.err(5314):     at java.lang.Thread.run(Thread.java:1096)

I guess that this line causes the trouble:

new FileOutputStream(testDirectory+"/file.csv");

You create a directory file first, but according to your stacktrace, you try to access file.csv on the root of the sdcard. So I guess that the you can't simply append a file.csv to your testDirectory variable of type File.

Found the answer! On the Galaxy tab the storage is not only /sdcard it is /sdcard/external_sd/

Samsung Galaxy Tab has a good amount of internal flash memory. So Environment.getExternalStorageDirectory() returns /mnt/sdcard/ but this is actually the internal storage. The real external storage is in /mnt/sdcard/external_sd/. Please see this post for details.