How to store stringbuffer into string array?

Question

Hi i am reading sqlite db data and store into string buffer. I want to display it in the list view in android. i am facing little problem. please help me to solve this issue.

String studentno=cursor.getString(1); String date=cursor.getString(2); buffer.append("student: "+studentno+" Time:"+date+"\n"); String data=buffer.toString(); Log.d("student: "+studentno+" Time:"+date);

the output is:student: 1234 Time:12:13 student: 1234 Time:12:14 student: 1234 Time:12:15

I want to store string buffer like this values[0]=student: 1234 Time:12:13 values[1]=student: 1234 Time:12:14 values[2]=student: 1234 Time:12:15

i tried below coding but its not working.

String[] values = data.split(""); for (int i = 0; i < values.length; ++i) { list.add(values[i]); }

is there any way to do this. thanks in advance.

Smajl · Accepted Answer · 2015-03-12 13:13:09Z

You seem to be adding the data into the buffer with new line delimiter at the end. Splitting them should look like this: data.split("\n");

This does not seem like a good idea, however. Mainly because you can have a very large data set and split is an expensive operation.

Why not create an ArrayList<String> and call list.add("student: " + studentno + " Time: " + date) or some other more efficient structure?

Code:

List<String> list = new ArrayList<String>(); String studentno=cursor.getString(1); String date=cursor.getString(2); list.add("student: " + studentno + " Time: " + date);

Eran · Accepted Answer · 2015-03-12 13:09:07Z

1

This makes no sense. If you want to store the data in an array, don't store it in a StringBuffer in the first place. Store it directly in the array.

You must have some loop in which you read the data :

String[] arr = new String [...]; int count = 0; while (cursor.next() && count < arr.length) { String studentno=cursor.getString(1); String date=cursor.getString(2); arr[count] = "student: "+studentno+" Time:"+date+"\n"; count++; }

edited Mar 12, 2015 at 13:09

answered Mar 12, 2015 at 13:02

Eran

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4 Comments

subramaniam Over a year ago

How can you explain me in detail. I used data.split("\n"); its working now Eran.

subramaniam Over a year ago

its working Eran. but i cant know the string array size. we cant give predefine size.we dont know how many data will come from db. how can i give dynamic size. if i am wrong, pls correct me.

Eran Over a year ago

@subramaniam In that case, you can add the data to an ArrayList (whose capacity is dynamic) and then convert to an array with the toArray method.

Secret_Volcano Over a year ago

@Eran i have same problem can u solve it plz.......stackoverflow.com/questions/40948014/…

teemann · Accepted Answer · 2015-03-12 13:00:57Z

You could try to replace your split call with this:

String[] values = data.split("\n");

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