Writing a File to Sdcard

Writing a file to sdcard

The openFileOutput() method writes data to your application's private data area (not the SD card), so that's probably not what you want. You should be able to call Environment.getExternalStorageDirectory() to get the root path to the SD card and use that to create a FileOutputStream. From there, just use the standard java.io routines.

Write file to sdcard in android

Try like this,

try {
    File newFolder = new File(Environment.getExternalStorageDirectory(), "TestFolder");
    if (!newFolder.exists()) {
        newFolder.mkdir();
    }
    try {
        File file = new File(newFolder, "MyTest" + ".txt");
        file.createNewFile();
    } catch (Exception ex) {
        System.out.println("ex: " + ex);
    }
} catch (Exception e) {
    System.out.println("e: " + e);
}

How to create and write to a file on sdcard with linux?

You should use the command mount(8) to mount the device first. That will cause the device's filesystem to be attached to your system's file-system, and therefore, makes you able to access files on it just like you normally do. For example:

mount /dev/mmcblk0 /home/yooo123/sdcard

If all goes well, you can read and write files to it using fopen, fwrite, etc.

FILE *fp = fopen("/home/yooo123/sdcard/file.txt", "w");
...
fprintf(fp, "Hello, SD Card!\n");

However, if you want to do all of that from a C program, look up the mount(2) system call.

int mount(const char *source, const char *target,
      const char *filesystemtype, unsigned long mountflags,
      const void *data);

How to write files on SD Card from Android API 24+

Take the second item returned by

File dirs[] =getExternalFilesDirs();

Check if the array contains more then one element before use. Not everybody puts a micro SD card in.

How do you write to a folder on an SD card in Android?

File sdCard = Environment.getExternalStorageDirectory();
File dir = new File (sdCard.getAbsolutePath() + "/dir1/dir2");
dir.mkdirs();
File file = new File(dir, "filename");

FileOutputStream f = new FileOutputStream(file);
...

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