Develop Reference

Handle comma separated string

Creating an app in which i want to get string from json but i have one key and multiple value so i don't know how to handle this.
"colours": "#fff600,#000000,#ffffff,#00000,#ff9900,#333333"
And want to use this color in different class:
final ValueAnimator colorAnimation = ValueAnimator.ofObject(new android.animation.ArgbEvaluator(), Color.RED, Color.BLUE,Color.WHITE,Color.YELLOW,Color.CYAN,Color.MAGENTA,Color.GREEN,Color.GRAY);
colorAnimation.setDuration(1400);

Put the value of colours in string variable and then split the string in following way and add it to an arraylist :
String[] arr = str.split(",");
ArrayList<String> arr1 = new ArrayList<String>();
for (int i=0; i<arr.length; i++){
arr1.add(arr[i]);
}

Get value of color and use string tokenizer with ',' delima like this:
StringTokenizer stringTokenizer = new StringTokenizer(colorValueString, ",");
Also it has stringTokenizer.nextToken to get the next color in string

You can get the value of colours as a string and then split the string into parts like this:
String colours = json.getString("colours");
Log.d(TAG, colours);
String items[] = colours.split(",");
for (String item : items) {
Log.d(TAG, item);
}

If you own the json
You should use JSONArray:
"colours": ["#fff600","#000000","#ffffff","#00000","#ff9900","#333333"]
And read it like
JSONObject json = ...;
JSONArray colorsArray = json.getJSONArray("colours");
for(int i = 0; i < colorsArray.length(); i++) {
String colorString = colorsArray.getString(i);
int color = Color.parseColor(colorString);
// you should probably also catch IllegalArgumentException for wrong input
}
If you don't own the json
You can read it as string and split around commas:
JSONObject json = ...;
String colorsString = json.getString("colours");
String[] colorStrings = colorsString.split(",");
for(String string : colorStrings) {
int color = Color.parseColor(string);
// you should probably also catch IllegalArgumentException for wrong input
}

load text from String array and set text to textview is very slow in big string array

hi
why load text from String array and set text to textview is very slow in big string array?
please help to me.
//get khotbe text from database and copy to khotbe activity
private void setkhotbetextarabicfarsi() {
this.sqliteDB = SQLiteDatabase.openOrCreateDatabase(this.getDatabasePath("aliname").getPath(), (SQLiteDatabase.CursorFactory) null);
Itemid = this.getIntent().getIntExtra("selectedFromListid", 1);
Cursor cursorLines = this.sqliteDB.rawQuery("SELECT * FROM khotbe where IDFehrest=" + this.Itemid , (String[]) null);
allrecs = cursorLines.getCount();
matn = new String[allrecs];
if (this.allrecs != 0) {
cursorLines.moveToFirst();
for (int i = 0; i < this.allrecs; ++i) {
String TextArabicOfKhotbe = cursorLines.getString(cursorLines.getColumnIndex("TextArabicOfKhotbe"));
int IDkhotbe = cursorLines.getInt(cursorLines.getColumnIndex("IDkhotbe"));
this.matn[i] = TextArabicOfKhotbe;
cursorLines.moveToNext();
}
}
and main code:
for(int var1 = 0; var1 < this.allrecs; ++var1) {
tvArabic = new JustifiedTextView(this);
tvArabic.setText(matn[var1]);

you are creating the textviews in loop that might making it slow.. try populating the array values using an adapter..
Also check the number of rows you are accessing from the DB. if they are huge in number, they would require more time to be fetched.
Use limit in that case.

Reomve special character from Arraylist

I am trying to remove special character from arraylist.
Not getting click how to do this?
I have 3 editfield and filling text after certain conditions
means when 1 is filled then another can be filled. now when i click to save this. this returns an array like [hello,abc,zbz] for fields
private List<String> hashtagData;
hashtagData = new ArrayList<String>();
String status_message = status.getText().toString();
String status_message2 = status2.getText().toString();
String status_message3 = status3.getText().toString();
hashtagData.add(status_message);
hashtagData.add(status_message2);
hashtagData.add(status_message3);
But I am trying to remove "[]".
Thank you if anybody can help.

Here try this:
ArrayList<String> strCol = new ArrayList<String>();
strCol.add("[a,b,c,d,e]");
strCol.add(".a.a.b");
strCol.add("1,2,].3]");
for (String string : strCol) {
System.out.println(removeCharacter(string));
}
private String removeCharacter(String word) {
String[] specialCharacters = { "[", "}" ,"]",",","."};
StringBuilder sb = new StringBuilder(word);
for (int i = 0;i < sb.toString().length() - 1;i++){
for (String specialChar : specialCharacters) {
if (sb.toString().contains(specialChar)) {
int index = sb.indexOf(specialChar);
sb.deleteCharAt(index);
}
}
}
return sb.toString();
}

Create regex which matches with your criteria, then loop through your list.
String myRegex = "[^a-zA-Z0-9]";
int index = 0;
for (String your_string : list)
list.set(index++, s.replaceAll(myRegex, ""));

can use below function to remove special character from string using regular expressions.
using System.Text;
using System.Text.RegularExpressions;
public string RemoveSpecialCharacters(string str)
{
return Regex.Replace(str, "[^a-zA-Z0-9_.]+", "", RegexOptions.Compiled);
}

Array index out of bounds exception android

I am trying to get the data from database table via php file and displaying it in android. In php file I seperated each column with "#".
So now I am getting values like 4#2012-11-06#test1#test2. But for some columns there is not data. So the values are comng like 5###.
Here when I splitting with # and displaying the data it is throwing out of bounds exception. How can I resolve this issue?
Code:
String st="1#2012-10-30#test1#2#2012-10-30#test2#3#2012-11-06#test3#9##test1#21###22###23###";
String[] val = st.trim().split("#");
for (int i = 0; i < val.length; i++)
{
String str = val[i];
String arr[] = str.split("#");
System.out.println("arr0" + arr[0]);
System.out.println("arr1" + arr[1]);
System.out.println("arr2" + arr[2]);
}

try as using Pattern.compile to split your current string :
String your_string = "4#2012-11-06#test1#test2";
Pattern pattern = Pattern.compile("#");
String[] strarray =pattern.split(your_string);
for Handling if array index contain empty string change your code as:
for (int i = 0; i < val.length; i++)
{
String your_string =val[i];
Pattern pattern = Pattern.compile("#");
String[] strarray =pattern.split(your_string);
for(int j=0;j<strarray.length;j++){
if(strarray[j].trim().length() >0){
System.out.println("arr"+j+"::" + strarray[j]);
}
else{
}
}
}

How to store the values dynamically in string in java android?

In my project I need to store the values dynamically in a string and need to split that string with ",". How can I do that ? Please help me..
My Code:
static ArrayList<ArrayList<String>> listhere;
ArrayList<String> arropids;
String arropids1;
for(int q=0;q<listhere.size();q++)
{
arropids = listhere.get(q);
if(arropids.get(3).equals("1"))
{
arropids1 += arropids.get(0) + ",";
System.out.println("arropids1"+arropids1);
}
}

You must be getting NullPointerException as you havent initialized the String, initialize it as
String arropids1="";
It will resolve your issue, but I dont Recommend String for this task, as String is Immutable type, you can use StringBuffer for this purpose, so I recommend following code:
static ArrayList<ArrayList<String>> listhere;
ArrayList<String> arropids;
StringBuffer buffer=new StringBuffer();
for(int q=0;q<listhere.size();q++)
{
arropids = listhere.get(q);
if(arropids.get(3).equals("1"))
{
buffer.append(arropids.get(0));
buffer.append(",");
System.out.println("arropids1"+arropids1);
}
}
and finally get String from that buffer by:
String arropids1=buffer.toString();

In order to split the results after storing your parse in the for loop, you use the split method on your stored string and set that equal to a string array like this:
static ArrayList<ArrayList<String>> listhere;
ArrayList<String> arropids;
String arropids1 = "";
for(int q=0;q<listhere.size();q++) {
arropids = listhere.get(q);
if(arropids.get(3).equals("1"))
{
arropids1 += arropids.get(0) + ",";
System.out.println("arropids1"+arropids1);
}
}
String[] results = arropids1.split(",");
for (int i =0; i < results.length; i++) {
System.out.println(results[i]);
}
I hope that this is what you're looking for.