Sdcard Content Exist But Cant See Them

SDCard content exist but cant see them

You probably need to index your files via MediaScannerConnection. Quoting myself from a blog post from last year:

...the MTP contents are not based on the literal contents of external storage. Instead, MTP contents are based on what files have been scanned by MediaScannerConnection. If you write a file to external storage, until and unless that file is scanned by MediaScannerConnection, it will not be visible to users over MTP.

External storage is scanned on a reboot and possibly on a periodic basis. Users can manually force a scan via utilities like SDRescan. However, the best answer is for you to use scanFile() on MediaScannerConnection to update the media database after you close your file. This will make your file immediately available to the user.

Can't check if file on sdcard exists

I think that problem is here:

getBaseContext()

where it is assigned to NULL. You really don't need this line. You can simply achieve your goal with

String path = Environment.getExternalStorageDirectory().getPath() + "/ping.xml";
File f = new File(path);
if (f.exists()) {
   // do your stuff
}
else {
  // do your stuff
}

Update:

If you or someone else have Samsung Galaxy S3, please follow @Raghunandan's answer because in this case getExternalStorageDirectory() returns internal memory.

Created folder is not visible in the file explorer..

Damn! :)

Now I solved my problem...I was misunderstanding the operation of creating files in the file system.

When I spoke of file explorer I meant the file explorer of the operating system and NOT the file explorer in the DDMS :).

I thought when I create a file I will see it in the file explorer of the operating system but when the device is connected to the PC the files can only be seen in the DDMS file explorer.

Sorry I'm new to Android ;)

When the App is running standalone without PC connection and afterwards I connect with the PC I see the created files and folders of course :)

Thanks for help

creating a txt file on sd card but i cant find it

getExternalStorageDirectory() does not necessary return /sdcard directory. See here Environment.getExternalStorageDirectory does not return the path to the removable storage

SD card data sometimes NOT seen on PC when connected in USB mass storage mode (via phone)

Your problem is an exact duplicate of SDCard content exist but cant see them - the PC is displaying the content as returned from the MTP interface.

Stub code to do what you need to make the file appear:

imports:

import android.media.MediaScannerConnection;
import android.os.Environment;
import android.util.Log;
import java.io.File;

stub code:

File f = new File(Environment.getExternalStorageDirectory().getPath() + "/hello_nurse.txt");
if (! f.exists()) {
    try {
        f.createNewFile();
        String[] files = new String[1];
        files[0] = Environment.getExternalStorageDirectory().getPath() + "/hello_nurse.txt";
        String[] mimes = new String[1];
        mimes[0] = "text/plain";
        MediaScannerConnection.scanFile(getApplicationContext(), files, mimes, null);
    } catch (Exception ex) {
        Log.e("SD Create", "Failed to create file", ex);
        return;
    }
} else {
    Log.e("SD Create", "File is already present");
}

Unable to see file in Windows Explorer while it is visible in Android file browser

Ok, I figured out why it was happening.
Actually even if we press "Back" button, the program keeps running and unless I go to Settings > Applications > Manage Applications > "Force Stop" <application> I can't access the file written by this program even if it is on sd card and even if the filewriter has been closed.

This is just based on my observation and I'd like someone to post a better answer with facts and with solution.

edit: I'll update my question accordingly.

edit: as recommended on meta I've posted a new question

Can't see a file in Windows written by an android app on sd-card unless I “Force Close” the app

Folder on phone not showing in Windows PC

Your pc will communicate with the media store about files. Not directly with the sdcard or external memory. If the media store does not know about your file your pc can not see it. You forgot to tell the store that you created a file. For every new file you should invoke the media scanner for that file. You are not the first one who happens this so the problem has been reported many times. You only need to add a few lines of code which you will find easily searching this site for invoking media scanner on new file. If you switch off/on your device the file will be known soon too.

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