Asked  7 Months ago    Answers:  5   Viewed   33 times

Samsung Galaxy S3 has an external SD card slot, which is mounted to /mnt/extSdCard.

How can I get this path by something like Environment.getExternalStorageDirectory()?

This will return mnt/sdcard, and I can't find the API for the external SD card. (Or removable USB storage on some tablets.)

 Answers

14

I have a variation on a solution I found here

public static HashSet<String> getExternalMounts() {
    final HashSet<String> out = new HashSet<String>();
    String reg = "(?i).*vold.*(vfat|ntfs|exfat|fat32|ext3|ext4).*rw.*";
    String s = "";
    try {
        final Process process = new ProcessBuilder().command("mount")
                .redirectErrorStream(true).start();
        process.waitFor();
        final InputStream is = process.getInputStream();
        final byte[] buffer = new byte[1024];
        while (is.read(buffer) != -1) {
            s = s + new String(buffer);
        }
        is.close();
    } catch (final Exception e) {
        e.printStackTrace();
    }

    // parse output
    final String[] lines = s.split("n");
    for (String line : lines) {
        if (!line.toLowerCase(Locale.US).contains("asec")) {
            if (line.matches(reg)) {
                String[] parts = line.split(" ");
                for (String part : parts) {
                    if (part.startsWith("/"))
                        if (!part.toLowerCase(Locale.US).contains("vold"))
                            out.add(part);
                }
            }
        }
    }
    return out;
}

The original method was tested and worked with

  • Huawei X3 (stock)
  • Galaxy S2 (stock)
  • Galaxy S3 (stock)

I'm not certain which android version these were on when they were tested.

I've tested my modified version with

  • Moto Xoom 4.1.2 (stock)
  • Galaxy Nexus (cyanogenmod 10) using an otg cable
  • HTC Incredible (cyanogenmod 7.2) this returned both the internal and external. This device is kinda an oddball in that its internal largely goes unused as getExternalStorage() returns a path to the sdcard instead.

and some single storage devices that use an sdcard as their main storage

  • HTC G1 (cyanogenmod 6.1)
  • HTC G1 (stock)
  • HTC Vision/G2 (stock)

Excepting the Incredible all these devices only returned their removable storage. There are probably some extra checks I should be doing, but this is at least a bit better than any solution I've found thus far.

Tuesday, June 1, 2021
 
njai
answered 7 Months ago
81

I would rather use a BitmapFactory to decode the Image from the file-path:

Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
jpgView.setImageBitmap(bitmap);

The Docs say:

If the specified file name is null, or cannot be decoded into a bitmap, the function returns null.

Can you check if the code works with another image and if you can open your image on your PC thought. Maybe the file is corrupt.

Thursday, June 3, 2021
 
Anand
answered 6 Months ago
42

I need to be able to toggle the GPS receiver on and off

For privacy reasons, if nothing else, enabling or disabling any sort of location-tracking needs to be solely in the hands of the user via trusted applications, not at the request of arbitrary third parties.

So, if you wish to enable and disable GPS, create your own firmware that does what you need and load that firmware on whatever devices you wish. Or, contribute your changes to existing firmware mods (e.g., Cyanogen).

WRITE_SECURE_SETTINGS is required to be able to access secure settings

Correct.

I've searched around quite a bit, and every answer I saw pretty much said that no app outside of the system/firmware can get that permisssion.

Correct.

However, that is simply untrue.

No, it's pretty true.

There are several apps on the market that do exactly what I'm trying to (in regards to GPS)

They found a security loophole. I will take steps to help ensure this hole gets fixed.

but there are a bunch more that have the WRITE_SECURE_SETTINGS permissions

No, there are a bunch who ask for them. You can ask for whatever permission you want. What you ask for is what shows up in these listings. What you get is a different story.

Monday, June 14, 2021
 
madphp
answered 6 Months ago
54

Go through the following code , its working fine for me.

private void createDirectoryAndSaveFile(Bitmap imageToSave, String fileName) {

    File direct = new File(Environment.getExternalStorageDirectory() + "/DirName");

    if (!direct.exists()) {
        File wallpaperDirectory = new File("/sdcard/DirName/");
        wallpaperDirectory.mkdirs();
    }

    File file = new File("/sdcard/DirName/", fileName);
    if (file.exists()) {
        file.delete();
    }
    try {
        FileOutputStream out = new FileOutputStream(file);
        imageToSave.compress(Bitmap.CompressFormat.JPEG, 100, out);
        out.flush();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}
Monday, June 21, 2021
 
sassy_geekette
answered 6 Months ago
91

You can use GetWindowThreadProcessId to get the process Id, use OpenProcess to get a process handle from the process Id and then the use the psapi method GetProcessImageFileName on the handle to get the path to the executable.

Or (based on Frank's answer), once you have the Process Id, you can use Process.GetProcessById(pid) and then use MainModule.FileName property of the Process object instance. This way you only need to p/invoke GetWindowThreadProcessId and not even use OpenProcess/GetProcessImageFileName.

Sunday, August 15, 2021
 
Droidman
answered 4 Months ago
Only authorized users can answer the question. Please sign in first, or register a free account.
Not the answer you're looking for? Browse other questions tagged :  
Share