Here’s a little low-level tutorial that I think will make your lives easier. What the use in enabling your SD card in a development environment, if you don’t know how to read / write to said drive? Well have no fear. Here’s a condensed, simple method for doing just that.
private void WriteToFile(String what_to_write) {
try{
/* Environment.getExternalStorage Directory calls the SDCard’s filepath, which may change per device */
File root = Environment.getExternalStorageDirectory();
//if we have permission to write to this drive…
if(root.canWrite()){
File dir = new File(root + "where_on_the_SDCard_do_you_want_to_write");
//
File datafile = new File(dir, number + ".extension");
FileWriter datawriter = new FileWriter(datafile);
BufferedWriter out = new BufferedWriter(datawriter);
// More likely is going to be a loop that writes consecutive entries of data
out.write(what_to_write);
//remember to close what you open…
out.close();
}
}catch(IOException e){
Log.e("Whoops", "Can’t write" + e.getMessage());
}
}
Ok… now that we can write to file… how about reading from that file? See below:
/*calling SD drive… you can replace w/ whatever path you want */
File f = new File(Environment.getExternalStorageDirectory().getPath() + "your_path" + ".your_extension");
FileInputStream fileIS = new FileInputStream(f);
BufferedReader buf = new BufferedReader(new InputStreamReader(fileIS));
String read = new String();
while((read = buf.readLine())!= null){
//Do Something Which each line of data read
parse(read);
}
