Develop Reference

Html Styling in textview goes wrong Android

I am selecting a part of the TextView and on click of a "highlight" button, I am sending the start and the end index of selection to the database. Then I am loading all the start and end indexes from db and changing the color of text between them.
The problem is after once or twice, the app is changing the color of text that is not in selection.. and the selected part remains unchanged.
MY CODE:
When user selects and presses the highlight button
int i=contentText.getSelectionStart();
int j=contentText.getSelectionEnd();
db.insertHiglightIndex(String.valueOf(i),String.valueOf(j));
setHighlightedText();
The setHighlightedText() method..
String fullText=contentText.getText().toString();
for(int i=0; i<db.getAllStartIndex().size();i++){
String a=fullText.substring(Integer.parseInt(db.getAllStartIndex().get(i)),Integer.parseInt(db.getAllEndIndex().get(i)));
fullText = fullText.replace(a, "<font color='red'>"+a+"</font>");
}
contentText.setText(Html.fromHtml(fullText), TextView.BufferType.SPANNABLE);
MY SCREENSHOTS.
The selection:
The Result:
Clearly the selected area is from "Garrick" to "Bart", and the result is from "entity" to "2012"
I am not able to understand why is this happening. I think there is some problem with this <font color='red'>"+a+"</font> line.
Thank you

It got wrong indexed because There is already added <font color='red'> in the beginning, So that in second time This tag is also counted as a part of string, So I suggest creating a new temporary String, assign same text to the String but after replacing the previous font tag it held. Use this syntax to remove previous font tag from originalString
String tempString = originalString.replaceAll("[<](/)?font[^>]*[>]", "");
After that work with only tempString. That means again add every previous font tag you have to tempString and set that text.
In next time again do the same first remove all font tag and again add all of them back in tempString as well as current selection using same loop you are using currently.

You have wrong indexes because you are modifying the fullText content within the loop.
Taking a look at this example you can figure it:
final TextView tv = (TextView) findViewById(R.id.textView);
tv.setText( "abcdefghijklmnopqrstuvwxyz0123456789");
String fullText= tv.getText().toString();
// your first iteration
String a = fullText.substring(1,3);
// a contains "ab"
fullText = fullText.replace(a, "<font color='red'>"+a+"</font>");
After the first iteration full text contains now
a<font color='red'>bc</font>defghijklmnopqrstuvwxyz0123456789"
Then the substring() in the second iteration won't returns the substring base on your initial content.
If you want to be able to have multiple substrings colored in red you can try this:
String fullText = contentText.getText().toString();
StringBuilder result = new StringBuilder();
for(int i=0; i < db.getAllStartIndex().size(); i++){
fullText = applyFont(result, fullText, Integer.parseInt(db.getAllStartIndex().get(i)), Integer.parseInt(db.getAllEndIndex().get(i)));
}
// Add here the remaining content
result.append(fullText);
contentText.setText(Html.fromHtml(result.toString()), TextView.BufferType.SPANNABLE);
private String applyFont(StringBuilder result, String source, int from, int to){
result.append(source.substring(0, from));
result.append("<font color='red'>");
result.append(source.substring(from, to));
result.append("</font>");
return source.substring(to, source.length());
}

accepting value in edittext even if it has spaces

i have this code in my app. which accepts the value of the edittext
if (ans.equalsIgnoreCase("bag")) {
btnEnter.setEnabled(false);
int a=Integer.parseInt(textView2.getText().toString());
int b=a+10;
String s1 = String.valueOf(b);
textView2.setText(s1);
Toast.makeText(getApplicationContext(), "Correct",Toast.LENGTH_SHORT).show();
my problem is if the user puts a single space in the edittext then proceeds with the "bag" it still prompts wrong like this for example
" " = space
" " bag ----- wrong
bag ----- correct
how can i set that with space it can accept

String ans2 = ans.trim();
if (ans2.equalsIgnoreCase("bag")) {
btnEnter.setEnabled(false);
int a=Integer.parseInt(textView2.getText().toString());
int b=a+10;
String s1 = String.valueOf(b);
textView2.setText(s1);
Toast.makeText(getApplicationContext(), "Correct",Toast.LENGTH_SHORT).show();
trim() function
Returns a copy of the string, with leading and trailing whitespace
omitted.
Since #ρяσѕρєя K deleted his answer before I got back to delete mine I will add his simplified edit. Change
if (ans2.equalsIgnoreCase("bag")) {
to
if (ans.trim().equalsIgnoreCase("bag")) {
then no need for
String ans2 = ans.trim();
But using a second variable may be better for readibility or functionality in certain situations
Edit
To take care of in between spaces you might try
if (!ans.contains("") && ans.trim().equalsIgnoreCase("bag")) {
Not sure why that doesn't work but you can use the replace function for Strings
String ans2 = ans.replace(" ", "");
if (ans2.trim().equalsIgnoreCase("bag")) {

Reformatting a String in Java

For my app I have created a QR Code, then took that bitmap and added text to the bitmap, however I need the text not to extend longer then the bitmap is. So what I want to do is create an Array of the text by taking 25 characters then find the last index of (" ") in that 25 character section. at that space I want to be able to replace that space that was located with \n to start a new line.
So the plan is if I have a String that looks like "Hello this is my name and I am longer than 25 charters and I have lots of spaces so that this example will work well."
I want it to out up this
Hello this is my name and
I am longer than 25
charters and I have lots
of spaces so that this
example will work well.
To make this I counted 25 characters then went back to the most resent space, at that point I hit enter, I want my app to do this for me.
I am not very good at English so if something doesn't make sense tell me and I will try to explain it. Thanks

I haven't tested this but you can try it and tweak as necessary
String fullText = "your text here";
String withBreaks = "";
while( fullText.length() > 25 ){
String line = fullText.substring(0,24);
int breakPoint = line.lastIndexOf( " ");
withBreaks += fullText.substring(0,breakPoint ) + "\n";
fullText = fullText.substring( breakPoint );
withBreaks += fullText;

char [] way (more C like):
public static String reduceLength(String s, int len){
char [] c = s.toCharArray();
int i=len, j=0, k;
while(true){
for(k=j; k<=i; k++){
if (k >= s.length()) return new String(c);
if (c[k] == ' ') j=k;
}
c[j] = '\n';
i= j+ len;
}
}
This isn't safe, just something i threw together.

How can I pull individual characters from a string and convert them to numbers?

What I'm trying to do is find a way I can take the word "camel" for example from a EditText field and make for instance c=2 a=1 m=4 e=5 l=3. Is there anyway I can pull the individual characters from a string and convert them to numbers?
I've tried using "split" to separate each character into an array but I can't figure out how to convert the letters into numbers
so I can do something like:
a=1
b=2
c=3
int temp = (int)(array[1]+array[2]+array[3]+etc...)
using the example of "camel" would equal 15
This is what I have so far:
String name = inputarea.getText().toString();
String[] array = name.split("");
for(int i =0; i < array.length ; i++)
The biggest problem I keep having is if I try to pull from the 7th position in the array and nothing is there. (camel only has 5 characters) then I get a nice big error.
Thank you for any help that can be provided.
Edit: I figured it out after a few hours of playing with it here is my working code:
String firstname = inputarea.getText().toString();
char[] array = firstname.toCharArray();
final char[] array2 = new char[15];
System.arraycopy(array, 0, array2, 0, array.length);
if (array2[0] == 'A' ) {
array2[0] = '1';
}

suggestion:
first, need define all letter, from a-z (A-Z), the ASCII code 'a' to 'z' is 97 to 122, if you want support the upper letter, you need add A-Z.
then, get the letter in the string, u can use this:
for(int i=0;i<string.length();i++){
int number = string.charAt(i);
}
when you get the number size, you can reduce to the base number('a' is 97), you will get the individual number

Does String.charAt() works for you?
As for converting to number, if the numbers are consecutive you can define a fixed string with all the characters you want to map and use String.indexOf(). If not, you can have a parallel array with ints or use a Map.

Android: Insert text into EditText at current position

I want to insert a constant string into an EditText by the press of a button. The string should be inserted at the current position in the EditText.
If I use EditText.append the text gets inserted at the end of the EditText.
How can I do that? I couldn't find a suitable method.

Cpt.Ohlund gave me the right hint. I solved it, now, partly with using EditText.getSelectionStart(), but I realized that you can also replace the selected text with the same expression and you don't need String.subString() for that.
int start = Math.max(myEditText.getSelectionStart(), 0);
int end = Math.max(myEditText.getSelectionEnd(), 0);
myEditText.getText().replace(Math.min(start, end), Math.max(start, end),
textToInsert, 0, textToInsert.length());
This works for both, inserting a text at the current position and replacing whatever text is selected by the user. The Math.max() is necessary in the first and second line because, if there is no selection or cursor in the EditText, getSelectionStart() and getSelectionEnd() will both return -1. The Math.min() and Math.max() in the third line is necessary because the user could have selected the text backwards and thus start would have a higher value than end which is not allowed for Editable.replace().

This seems simpler:
yourEditText.getText().insert(yourEditText.getSelectionStart(), "fizzbuzz");
However, Manuel's answer might be better if you want to replace any selected text with the inserted text.

Try using EditText.getSelectionStart() to get the current position of the cursor. Then you can use String.subString to get the text before and after the cursor and insert your text in the middle.

I think this function will help for you :
public void insertConstantStr(String insertStr) {
String oriContent = editText.getText().toString();
int index = editText.getSelectionStart() >= 0 ? editText.getSelectionStart() : 0;
StringBuilder sBuilder = new StringBuilder(oriContent);
sBuilder.insert(index, insertStr);
editText.setText(sBuilder.toString());
editText.setSelection(index + insertStr.length());
}

For Kotlin simply do that:
editText.text.insert(editText.selectionStart, "Your Text Here")

Editable editable = new SpannableStringBuilder("Pass a string here");
yourEditText.text = editable;