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Is there a way to automatically select text in TextView?

Is there a way to automatically select or highlight a predetermined area of text on TextView? For instance, I want a specific line on the TextView to be already pre-selected when I start the activity, instead of having the user select that area of text themselves.

What you're looking for is most likely the setSelection, function.
it works like this:
EditText edText = findViewById(id);
edText.setSelection(start, stop);
The setSelection() function takes 2 arguments start and stop, both are ints, its the index of the character where you want the selection to start and the index of the character where you want the selection to end.
for example setSelection(0,1) will select the first character of the EditText.
If you want to select a specific String in an EditText you could do something like:
EditText edText = findViewById(id);
String lookingFor = "whatever youre looking for";
//You get the index of the first character of the string you're looking for
int start = edText.getText().toString().indexOf(lookingFor);
//You add the string's length to the index so the selection actually selects the
//whole string.
int stop = start+lookingFor.length();
//You -start- selecting from the 1st character and -stop- at the last character
//Of the string you're looking for.
edText.setSelection(start,stop);

Dealing with long Strings & TextView behavior

I’m developing an android app that gets objects from a server and shows them in a simple list.
I’m trying to figure out how to deal with long object’s titles :
Every title populates a designated multi-line TextView.
If a title is longer than 16 characters, it messes with my desired UI.
There are two scenarios I need to solve -
1). If the title is longer than 16 characters & contains more than one word, I need to split the words into different lines (I tried to .split("") and .trim(), but I don’t want to use another view, just break a line in the same one, and the use in ("") seems unreliable to me).
2). If the title is longer than 16 characters and contains only one long word, I only need to change font size specifically.
Any ideas for a good and reliable solution?
Thanks a lot in advance.

use SpannableString for a single view
For title:
SpannableString titleSpan = new SpannableString("title String");
titleSpan.setSpan(new RelativeSizeSpan(1.3f), 0, titleSpan.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
for Message
SpannableString messageSpan = new SpannableString("Message String");
messageSpan.setSpan(new RelativeSizeSpan(1.0f), 0, messageSpan.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
set in TextView
tvTermsPolicyHeading.setText(TextUtils.concat(titleSpan, messageSpan));

Code like below it will work as you need
String title; //your title
//find length of your title
int length = title.length();
if (length>16){
string[] titles = myString.split("\\s+");
int size = titles.length;
if (size < 2){
yourTextview.setText(title);
// reduce the text size of your textview
}else {
String newTitle= "";
for (int i=0;i<titles.length;i++){
newTitle = titles[i]+"\n"
}
yourTextview.setText(newTitle);
}
}

You can split and then concatenate the words using "\n" if there are more than one words.
In case of long word
You can see this question here
Auto-fit TextView for Android

try this:
if(title.split(" ").size > 1){
String line1 = title.substring(0, 16);
int end = line1.lastIndexOf(" ");
titleTextView.setText(title.substring(0,end) + "\n" +
title.substring(end+1,title.size-1);
}else{
titleTextView.setText(title);
titleTextView.setTextSize(yourTextSize);
}
this code should work perfectly for your case.

Setting the color of multiple characters of TextView in java

I will do my best to explain my problem, sorry if I am not clear. Basically I want to set the color of individual characters of a text, and then display them in Android App Development Kit. The problem I am having is that I am taking an array of the characters, and don't know how to set the color of them to a certain hexadecimal value.
For instance if the String is "hello". I would want each character to be a different color.
So I would take 'h' and assign it the hexadecimal value of "#000000". And then display it using xml. Is this possible? Here is what I am attempting to do now with my code.
String end = "";
for (int p = 0; p < charzart.size(); p++) {
if (charzart.get(p).equals(" ")) {
}
else{
Spannable colorSpan = new SpannableString(charzart.get(p));
int fake = Integer.parseInt(color.get(p));
colorSpan.setSpan(new ForegroundColorSpan(fake), 0, 1, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
end += colorSpan;
}
}
output.setText(end);
Right now my code doesn't work and I am not sure why. So i am running through charzart which holds my characters. And then attempting to assign the hexadecimal value ( which I have in another array list called color). I check to see if there is a space, if there is I ignore it and move on until i reach a character. From there, I get the character, set it to a spannable. I then get the color, apply it to the spannable, add it to a string and at the end set the TextView to that string.
Basically I want to know how to assign a hexadecimal value to a character, which will then be outputted by XML.

how to replace a word with in contains() Method form a JtextPane

Well, I'm trying to replace a word by using contains() Method:
String z = tfB.getText().toString();
String show = textPane.getText().toString();
if(show.contains(z)){
// how I specify the word that were found and change it without
effecting anything with in that line
}
well what I main by that:
What I'm trying to do is get the value from the user.
then search if it found replace it with something. For example:
String x = "one two three four five";
It should set the textPane to "one two 3 four five"
or
"one two 3-three-3 four five"
could any one please tell me how to do it.
Thank you

What I'm trying to do is get the value from the user. then search if it found replace it with something.
Don't use the contains() method because you will need to search the text twice:
once to see if the text is found in the string
again to replace the text with a new string.
Instead, use the String.indexof(...) method. It will return the index of the text IF it is found in the String.
Then you should replace the text directly in the Document of the text pane, not in the String itself. So the code would be something like:
int length = textPane.getDocument().getLength();
String text = textPane.getDocument().getText(0, length);
String search = "abc...";
int offset = text.indexOf(search);
if (offset != -1)
{
textPane.setSelectionStart(offset);
textPane.setSelectionEnd(offset + search.length();
textPane.replaceSelection("123...");
}
Also, not that you get the text from the Document, not the text pane. This is to make sure the offsets are correct when you replace the text in the Document. Check out Text and New Lines for more information on why this is important.

Android - how to delete last 2 lines from String?

I have a String which always looks like this:
data
data
data
data
non-data
non-data
And I need to delete the 2 last lines from it. The lenght of these lines can be different. How I can do that fast (String = ~1000 lines)?

I'd say something along the lines of:
String[] lines = input.split("\n");
String[] dataLines = Arrays.copyOfRange(lines, 0, lines.length - 2);

int lastNewLineAt = string.lastIndexOf("\n");
string.subString(0, string.lastIndexOf("\n", lastNewLineAt));
You can use constant for new line character reading system property

This Code will split your text by "\n" 's which means your lines in to a String Array.
Than you will get that array's length..
And in a for loop you will set and append your text till your length-1 element.
This may be a long approach but I was searching this and I couldn't find anything.
This was my easiest way.
String[] lines = YourTextViev.getText().toString().split("\n");
YourTextView.setText(""); // clear your TextView
int Arraylength = lines.length-1; // Changing "-1" will change which lines will be deleted
for(int i=0;i<Arraylength;i++){
YourTextView.append(lines[i]+"\n");
}