Develop Reference

Transform txt file into string

I have downloaded a txt file from Firebase, and I have the path and everything, and I'm trying to convert this file into a String, so I can set all the content of the file to another method
i have tried this
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(myTxtFile));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append('\n');
}
Log.e("OUTPUTSTRING",""+br);
br.close();
}
catch (IOException e) {
//You'll need to add proper error handling here
}
but in my log I cant see the content of the file, instead, it returns this
java.io.BufferedReader#5eb1add

That's because you're logging br which is an object of BufferedReader. You probably want to build the string using text.toString() and log it.

On Android, how to read the exact text of a file, when one finishes with a newline, and another doesn't

This is related to a situation I find myself in working with saving text files in Unity on Android, then reading them in native Android.
One of the files we read is a HMACMD5 signature, created with the code,
byte[] bData = System.Text.Encoding.UTF8.GetBytes (data);
byte[] bKey = System.Text.Encoding.UTF8.GetBytes (key);
using (HMACMD5 hmac = new HMACMD5(bKey)) {
byte[] signature = hmac.ComputeHash (bData);
return System.Convert.ToBase64String (signature);
}
And then written to the phone with,
public static void SaveText (string path, string data) {
using (FileStream fs = new FileStream(path, FileMode.Create)) {
using (StreamWriter sw = new StreamWriter(fs)) {
sw.Write (data);
}
}
}
The other string we're saving is a JSON string dump. The signature has a newline character at the end of the string, but the JSON string doesn't. I know I can manually add one, but this question is about reading the accurate file contents.
On Android, based on previous SO answers, I read the file with,
String readFile(File file) {
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append("\n");
}
br.close();
}
catch (IOException e) {
MyLogger.e(LOG_TAG, "Error opening file " + file.getPath(), e);
}
return text.toString();
}
I'm manually adding the newline character after every line, but if I do this, I don't accurately read the JSON file, which doesn't have a newline character at the end. If I don't add the newline, I don't accurately read the signature file, which does.

You better then do not use readLine() but read().

Android, reading in multiline text file groups the text together, need assistance

I have a working filereader for a text file in my Raw Dir. The user should see the text file in the same format as I have formatted it in word but when the application is played, the text file is tightly grouped together with no paragraphs.
This is the file reader method below, as I said it does work but I just want the format to be as I have made it.
Your advice and guidance will be greatly appricated
#Override
protected void onCreate(Bundle b) {
super.onCreate(b);
setContentView(R.layout.activity_support);
InputStreamReader isr = new InputStreamReader(this.getResources().openRawResource(R.raw.supporttext));
BufferedReader br = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
String s;
try{
while ((s = br.readLine()) != null){
sb.append(s);
}
}catch (IOException e) {
e.printStackTrace();
}
TextView tv = (TextView)findViewById(R.id.supporttxt);
tv.setText(sb.toString());

From BufferedReader#readline java doc :
A String containing the contents of the line, not including any line-termination characters
So using readline strips the line-termination characters, that's why you do not see them in your Text View. You can add them back like this :
try{
while ((s = br.readLine()) != null){
sb.append(s);
sb.append("\n");
}
}catch (IOException e) {
e.printStackTrace();
}
Also, you should probably use getText instead of openRawResource

How to load a csv file into android for read/write

I am building an app which needs to read and edit items from a .csv file.
I can place the .csv in the assets folder but would rather the ability to search for it in the external storage as it will change regularly.
A friend has given me this code for placing it in the assets folder, but I am relatively new to android and this code doesn't make sense to me and I cant get it to work.
public ArrayList<String> Job = new ArrayList<String>();
try {
is = res.getAssets().open("Job.csv");
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = reader.readLine()) != null)
Job.add(line);
} catch (IOException ex) {
// handle exception
} finally {
try {
is.close();
} catch (IOException e) {
// handle exception
}
}

Line by line file operation in Android

I am trying to do what FileWriter.println() and BufferedReader.readLine() do in Android, but in android they only allow writing it into the sdcard using those method.
I need to write some integer values into the file and then read it line by line at a later time. Some of the file operation methods I found require the length of the data read to be specified, which is not possible.
Can anyone point me to the right method? Preferably with an example of the usage...
Regards

You can write to the SD card by using this path, "\sdcard\file_name"
and read it this way,
InputStream instream = null;
as
InputStream instream = openFileInput("/sdcard/filename");
// if file the available for reading
if (instream != null) {
// prepare the file for reading
InputStreamReader inputreader = new InputStreamReader(instream);
BufferedReader buffreader = new BufferedReader(inputreader);
String line;
// read every line of the file into the line-variable, on line at the time
try {
while (( line = buffreader.readLine()) != null) {
Log.i(TAG, "line = "+line);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// close the file again
try {
instream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}