Develop Reference

String Tokenizing from file in android

I have a file stored in my phone "SaveTT.txt" . Every word in the file is seperated by spaces. i wish to retrieve each word from the file and display every word in seperate textViews. How to do this. please help
I am able to retrieve the contents of the file into a string with the following code
try {
BufferedReader inputReader = new BufferedReader(new InputStreamReader(
openFileInput("SAVETT.txt")));
StringBuffer stringBuffer = new StringBuffer();
while ((inputString = inputReader.readLine()) != null) {
stringBuffer.append(inputString + "\n");
//EditText txt = (EditText) findViewById(R.id.temp);
//txt.setText(inputString);
}
} catch (IOException e) {
e.printStackTrace();
}
with this code get the entire string into inputString
after this . i am tokenizing the string with the following code
StringTokenizer tokenizer = new StringTokenizer(inputString);
String[] arr = new String[tokenizer.countTokens()];
while(tokenizer.hasMoreElements())
{
arr[i]= tokenizer.nextToken();
i++;
}
with the above code i am trying to save eack token in an array. Next I try to display the text in Textviews.
I dont know where i am goig wrong. the activity is stopped and a NullPointer exception is displayed.

I Figured out the problem myself. The problem was that the value of inputString is inaccessible from outside the Try catch block since it is set inside the block;
so if i write the string tokenisation block inside try catch it works perfectly fine

How to handle special characters in json string

I have an app where I store user entered text into a json string. I then store that json string into a file. And then later on display it back by reading the file, extracting the json string from it and finally getting the string to display into a textview. I am however noticing that any special characters(rather symbols) like £, ÷, € etc are not displayed back. For example the symbol € gets displayed as â□¬.
Some sample code below for reference
First the code for capturing user entered text and putting it into a file
//get user entered text
QuestionEditText = (EditText)this.findViewById(R.id.editTextQuestion);
//put that into json object
JSONObject jObjOneQuestionDetails=new JSONObject();
jObjOneQuestionDetails.put("Question", QuestionEditText.getText());
//write json object into file
FileOutputStream output = openFileOutput("MyFileName",MODE_PRIVATE);
OutputStreamWriter writer = new OutputStreamWriter(output);
writer.writejObjOneQuestionDetails.put());
writer.flush();
writer.close();
Now below the code for getting the string back from file and displaying it to user
//define and initialize variables
QuestionEditText = (EditText)this.findViewById(R.id.editTextQuestion);
private JSONArray jArrayQuizQuestions=new JSONArray();
private JSONObject jObjQuizTitle=new JSONObject();
//load JSONObject with the File
int ch;
StringBuffer fileContent = new StringBuffer("");
FileInputStream fis;
String fileString;
fis = this.getBaseContext().openFileInput("MyFileName");
while( (ch = fis.read()) != -1)
fileContent.append((char)ch);
fileString = new String(fileContent);
jObjQuizTitle = new JSONObject(fileString);
jArrayQuizQuestions = jObjQuizTitle.getJSONArray("MyFileName");
//display json object into textview
JSONObject aQues = jArrayQuizQuestions.getJSONObject(pageNumber-1);
String quesValue = aQues.getString("Question");
QuestionEditText.setText(quesValue.toCharArray(), 0, quesValue.length());
The code above is just a sample, I have ignored any try/catch blocks here. This should give an idea about how I am capturing and displaying the user entered text.

You have to use "UTF-8" for using this kind of special character. For details read http://developer.android.com/reference/java/nio/charset/Charset.html
You have to encode for your expected character like this way :
URLEncoder.encode("Your Special Character", "UTF8");
You can check similar question about this issue from here :
Android: Parsing special characters (ä,ö,ü) in JSON

Get HTML code from url in android

I was wondering if is any way to get HTML code from any url and save that code as String in code?
I have a method:
private String getHtmlData(Context context, String data){
String head = "<head><style>#font-face {font-family: 'verdana';src: url('file://"+ context.getFilesDir().getAbsolutePath()+ "/verdana.ttf');}body {font-family: 'verdana';}</style></head>";
String htmlData= "<html>"+head+"<body>"+data+"</body></html>" ;
return htmlData;
}
and I want to get this "data" from url. How I can do that?

Try this (wrote it from the hand)
URL google = new URL("http://www.google.com/");
BufferedReader in = new BufferedReader(new InputStreamReader(google.openStream()));
String input;
StringBuffer stringBuffer = new StringBuffer();
while ((input = in.readLine()) != null)
{
stringBuffer.append(input);
}
in.close();
String htmlData = stringBuffer.toString();

Sure you can. That's actually the response body. You can get it like this:
HttpResponse response = client.execute(post);
String htmlPage = EntityUtils.toString(response.getEntity(), "ISO-8859-1");

take a look at this please, any other parser will work too, or you can even make your own checking the strings and retrieving just the part you want.

Separate different Strings from text

I want to read a txt file that contains a lot of different chunks of text separated by a string. In xcode this is pretty easy and i just use.
self.Array = [text componentsSeparatedByString: #"NEWSTRING"];
I don't seem to get this to work in android though, I can read in the whole text and put it into an array but it doesn't get separated so its just one long text.
I am using this code
AssetManager mngr;
String line = null;
boolean skillcheck = false;
StringBuffer sb = new StringBuffer(0);
String[] bb = null;
tester = new ArrayList <String>();
try {
mngr = getAssets();
InputStream is = mngr.open("mytext.txt");
InputStreamReader sir = new InputStreamReader(is);
BufferedReader br = new BufferedReader(sir);
while((line=br.readLine()) != null) {
sb.append(line);
sb.append("\n");
}
tester.add(sb);
br.close();
} catch (IOException e1) {
}
Any good ways to do this?

You can use String.split method
String[] result = text.split("sometext");
For your acknowledgement
String.split returns the array of strings computed by splitting this
string around matches of the given regular expression

You should use StringTokenizer.
StringTokenizer sTok=new StringTokenizer(stringVariable, "newString");
while(sTok.hasMoreTokens())
System.out.println(sTok.nextToken());
stringVariable is the file contents and newString is the delimiter string.
EDIT
The second parameter of the StringTokenizer's constructor is the delimiter. It can be a new line \n or comma , or whatever you want.

Android - Notepad as database storage

I've been given a database of english words but they're in a .txt file. not an sql file.
My professor told me I could use it as database for my dictionary application instead of using sqlite.
Can anybody please give me any idea how to access the notepad?
I need to compare an inputWord to the notepad files and if found, it will copy the definition of the inputWord from the notepad and display it onscreen.

Notepad files have UTF-8 Text String stored in them, what you will have to do is to read the whole file, parse the keywords and their definitions , and then search for any keyword in the list.
a pseudocode for that would look like this:
FileInputStream fis = new FileInputStream("the_file_name");
BufferedReader br = new BufferedReader(new InputStreamReader(fis, Charset.forName("UTF-8")));
StringBuilder builder = new StringBuilder();
String line = null;
do {
line = br.readLine();
builder.append(line);
} while (line != null);
parseFile(builder.toString);
public void parseFile(String txt){
....... code to parse the txt from file and pass it to variables to use in the comparison
}