I am trying to print a decimal number inside a textview with a special format: the part on the left of the comma in one particular size and the part on the right in a different size.
Any idea about how can I make this work?
you can make use of SpannableString
TextView tv = findViewById(R.id.textview);
String value = "10.3";
final SpannableString text = new SpannableString(value);
text.setSpan(new RelativeSizeSpan(1.5f), value.indexOf(".")+1, value.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
text.setSpan(new ForegroundColorSpan(Color.RED), value.indexOf(".")+1, value.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.setText(text);
for more refer these
http://alexandroid.net/spannablestring-example/
https://developer.android.com/reference/android/text/SpannableString.html
https://takeoffandroid.com/android-spannable-text-view-to-change-color-size-style-and-adding-click-event-for-particular-word-8acd8a05ec61
Use SpannableString..
Example
String yourText = "20.00";
SpannableString ss = new SpannableString(yourText);
ss.setSpan(new RelativeSizeSpan(1.2f), youString.indexOf(".") + 1, youString.length(), 0);
yourTextview.setText(ss);
Here is an example doing this
double number = 422.343;
String completeNumber = String.valueOf(number);
int decimalPointIndex = completeNumber.indexOf('.');
SpannableString ss= new SpannableString(completeNumber);
ss.setSpan(new RelativeSizeSpan(2f), 0,decimalPointIndex, 0);
textView.setText(ss);
Convert the decimal number to String
Get index value of decimal point
Then use it and display the first part before decimal as bigger
I want to create a TextView that contains programming language code. like the following picture
I think that I should use html for give color and also will use string functions such as indexof,substring .. firstly, will find "for" and if i find it i will replace it with
<h3 style="color:blue;margin-left:20px;">for</h3>
But I am not sure if its the best way or useful.. Do you have any idea to do it on android?
PS: I am not making a compiler, just want to show piece of code
PS2: I am not asking for webview or textview.. Just want to learn how can I do it except my html case. Doesnt matter webview or textview or editview
Try this
public static Spannable setFourDifferentFontStyle(final Context context, String original,
String firstWord, String color1, float size,
String secondWord, String color2, float size2,
String thirdWord, String color3, float size3,
String fourthWord, String color4, float size4)
{
// Create a new spannable with the two strings
Spannable spannable = new SpannableString(firstWord + secondWord + thirdWord + fourthWord);
spannable.setSpan(new RelativeSizeSpan(size), 0, firstWord.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(new ForegroundColorSpan(Color.parseColor(color1)), 0, firstWord.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(new RelativeSizeSpan(size2), firstWord.length(), firstWord.length() + secondWord.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(new ForegroundColorSpan(Color.parseColor(color2)), firstWord.length(),firstWord.length() + secondWord.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(new RelativeSizeSpan(size3), firstWord.length() + secondWord.length(), firstWord.length() + secondWord.length() + thirdWord.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(new ForegroundColorSpan(Color.parseColor(color3)), firstWord.length() + secondWord.length(),firstWord.length() + secondWord.length() + thirdWord.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(new RelativeSizeSpan(size4), firstWord.length() + secondWord.length() + thirdWord.length(), original.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan(new ForegroundColorSpan(Color.parseColor(color4)), firstWord.length() + secondWord.length() + thirdWord.length(), original.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
Thank you for all attention, I've completly found a solution that I want.
I've used codemirror library, and found a sample for android.
you can download the project from code google
I have an EditText, and can add formatting such as bold, italic....but how can I remove it? I've looked into getSpans, filters, and other non-string things and haven't been able to make sense of them! Ideally, I'd like to be able to clear specific tags and all tags set around the selected text.
Update with my solution:
private String getSelectedText(){
int start = Math.max(mText.getSelectionStart(), 0);
int end = Math.max(mText.getSelectionEnd(), 0);
return mText.getText().toString().substring(Math.min(start, end), Math.max(start, end));
}
private void clearFormat(){
int s1 = Math.max(mText.getSelectionStart(), 0);
int s2 = Math.max(mText.getSelectionEnd(), 0);
String text = getSelectedText(); if(text==""){ return; }
EditText prose = mText;
Spannable raw = new SpannableString(prose.getText());
CharacterStyle[] spans = raw.getSpans(s1, s2, CharacterStyle.class);
for (CharacterStyle span : spans) {
raw.removeSpan(span);
}
prose.setText(raw);
//Re-select
mText.setSelection(Math.min(s1,s2), Math.max(s1, s2));
}
but how can I remove it?
Call removeSpan() on the Spannable.
For example, this method from this sample project searches for a search string in the contents of a TextView and assigns it a background color, but only after removing any previous background colors:
private void searchFor(String text) {
TextView prose=(TextView)findViewById(R.id.prose);
Spannable raw=new SpannableString(prose.getText());
BackgroundColorSpan[] spans=raw.getSpans(0,
raw.length(),
BackgroundColorSpan.class);
for (BackgroundColorSpan span : spans) {
raw.removeSpan(span);
}
int index=TextUtils.indexOf(raw, text);
while (index >= 0) {
raw.setSpan(new BackgroundColorSpan(0xFF8B008B), index, index
+ text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
index=TextUtils.indexOf(raw, text, index + text.length());
}
prose.setText(raw);
}
}
what you could try is:
1- Create a custom style where your EditText will have "such as bold, italic..."
2- Be aware of using R.style.normalText to change it back to it's normal style at runtime
3- Change this styles depending on the behaviour you want to achieve via setTextAppearance(Context context, int resid)
Here is an example i found googling How to change a TextView's style at runtime
Edit: as your question is "How to clear formatting from an EditText" here is the specific answer as code:
editTextToClearStyle.setTextAppearance(this,R.style.normalText);
Please see the comment of the snippet below.
if (makeItalic) {
SpannableString spanString = new SpannableString(textViewDescription.getText());
spanString.setSpan(new StyleSpan(Typeface.ITALIC), 0, spanString.length(), 0);
this.textViewDescription.setText(spanString);
} else {
SpannableString spanString = new SpannableString(
textViewDescription.getText().toString()); // NOTE: call 'toString()' here!
spanString.setSpan(new StyleSpan(Typeface.NORMAL), 0, spanString.length(), 0);
this.textViewDescription.setText(spanString);
}
... just get the raw string characters by calling the toString() method.
Is it possible to set the color of just span of text in a TextView?
I would like to do something similar to the Twitter app, in which a part of the text is blue. See image below:
(source: twimg.com)
Another answer would be very similar, but wouldn't need to set the text of the TextView twice
TextView TV = (TextView)findViewById(R.id.mytextview01);
Spannable wordtoSpan = new SpannableString("I know just how to whisper, And I know just how to cry,I know just where to find the answers");
wordtoSpan.setSpan(new ForegroundColorSpan(Color.BLUE), 15, 30, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
TV.setText(wordtoSpan);
Here is a little help function. Great for when you have multiple languages!
private void setColor(TextView view, String fulltext, String subtext, int color) {
view.setText(fulltext, TextView.BufferType.SPANNABLE);
Spannable str = (Spannable) view.getText();
int i = fulltext.indexOf(subtext);
str.setSpan(new ForegroundColorSpan(color), i, i + subtext.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
I always find visual examples helpful when trying to understand a new concept.
Background Color
SpannableString spannableString = new SpannableString("Hello World!");
BackgroundColorSpan backgroundSpan = new BackgroundColorSpan(Color.YELLOW);
spannableString.setSpan(backgroundSpan, 0, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);
Foreground Color
SpannableString spannableString = new SpannableString("Hello World!");
ForegroundColorSpan foregroundSpan = new ForegroundColorSpan(Color.RED);
spannableString.setSpan(foregroundSpan, 0, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);
Combination
SpannableString spannableString = new SpannableString("Hello World!");
ForegroundColorSpan foregroundSpan = new ForegroundColorSpan(Color.RED);
BackgroundColorSpan backgroundSpan = new BackgroundColorSpan(Color.YELLOW);
spannableString.setSpan(foregroundSpan, 0, 8, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableString.setSpan(backgroundSpan, 3, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);
Further Study
Explain the meaning of Span flags like SPAN_EXCLUSIVE_EXCLUSIVE
Android Spanned, SpannedString, Spannable, SpannableString and CharSequence
If you want more control, you might want to check the TextPaint class. Here is how to use it:
final ClickableSpan clickableSpan = new ClickableSpan() {
#Override
public void onClick(final View textView) {
//Your onClick code here
}
#Override
public void updateDrawState(final TextPaint textPaint) {
textPaint.setColor(yourContext.getResources().getColor(R.color.orange));
textPaint.setUnderlineText(true);
}
};
Set your TextView´s text spannable and define a ForegroundColorSpan for your text.
TextView textView = (TextView)findViewById(R.id.mytextview01);
Spannable wordtoSpan = new SpannableString("I know just how to whisper, And I know just how to cry,I know just where to find the answers");
wordtoSpan.setSpan(new ForegroundColorSpan(Color.BLUE), 15, 30, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(wordtoSpan);
Another way that could be used in some situations is to set the link color in the properties of the view that is taking the Spannable.
If your Spannable is going to be used in a TextView, for example, you can set the link color in the XML like this:
<TextView
android:id="#+id/myTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColorLink="#color/your_color"
</TextView>
You can also set it in the code with:
TextView tv = (TextView) findViewById(R.id.myTextView);
tv.setLinkTextColor(your_color);
Here's a Kotlin Extension Function I have for this
fun TextView.setColouredSpan(word: String, color: Int) {
val spannableString = SpannableString(text)
val start = text.indexOf(word)
val end = text.indexOf(word) + word.length
try {
spannableString.setSpan(ForegroundColorSpan(color), start, end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
text = spannableString
} catch (e: IndexOutOfBoundsException) {
println("'$word' was not not found in TextView text")
}
}
Use it after you have set your text to the TextView like so
private val blueberry by lazy { getColor(R.color.blueberry) }
textViewTip.setColouredSpan("Warning", blueberry)
String text = "I don't like Hasina.";
textView.setText(spannableString(text, 8, 14));
private SpannableString spannableString(String text, int start, int end) {
SpannableString spannableString = new SpannableString(text);
ColorStateList redColor = new ColorStateList(new int[][]{new int[]{}}, new int[]{0xffa10901});
TextAppearanceSpan highlightSpan = new TextAppearanceSpan(null, Typeface.BOLD, -1, redColor, null);
spannableString.setSpan(highlightSpan, start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableString.setSpan(new BackgroundColorSpan(0xFFFCFF48), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableString.setSpan(new RelativeSizeSpan(1.5f), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
return spannableString;
}
Output:
Set Color on Text by passing String and color:
private String getColoredSpanned(String text, String color) {
String input = "<font color=" + color + ">" + text + "</font>";
return input;
}
Set text on TextView / Button / EditText etc by calling below code:
TextView:
TextView txtView = (TextView)findViewById(R.id.txtView);
Get Colored String:
String name = getColoredSpanned("Hiren", "#800000");
Set Text on TextView:
txtView.setText(Html.fromHtml(name));
Done
There's a factory for creating the Spannable, and avoid the cast, like this:
Spannable span = Spannable.Factory.getInstance().newSpannable("text");
Just to add to the accepted answer, as all the answers seem to talk about android.graphics.Color only: what if the color I want is defined in res/values/colors.xml?
For example, consider Material Design colors defined in colors.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="md_blue_500">#2196F3</color>
</resources>
(android_material_design_colours.xml is your best friend)
Then use ContextCompat.getColor(getContext(), R.color.md_blue_500) where you would use Color.BLUE, so that:
wordtoSpan.setSpan(new ForegroundColorSpan(Color.BLUE), 15, 30, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
becomes:
wordtoSpan.setSpan(new ForegroundColorSpan(ContextCompat.getColor(getContext(), R.color.md_blue_500)), 15, 30, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
Where I found that:
Working with spans in Android – Michael Spitsin – Medium
Using kotlin-ktx, you can achieve it easily
bindView?.oneTimePasswordTitle?.text = buildSpannedString {
append("One Time Password ")
inSpans(
ForegroundColorSpan(ContextCompat.getColor(bindView?.oneTimePasswordTitle?.context!!,R.color.colorPrimaryText))
){
append(" (As Registered Email)")
}
}
Some answers here aren't up to date. Because, you will (in most of cases) add a custom clic action on your link.
Besides, as provided by the documentation help, your spanned string link color will have a default one.
"The default link color is the theme's accent color or android:textColorLink if this attribute is defined in the theme".
Here is the way to do it safely.
private class CustomClickableSpan extends ClickableSpan {
private int color = -1;
public CustomClickableSpan(){
super();
if(getContext() != null) {
color = ContextCompat.getColor(getContext(), R.color.colorPrimaryDark);
}
}
#Override
public void updateDrawState(#NonNull TextPaint ds) {
ds.setColor(color != -1 ? color : ds.linkColor);
ds.setUnderlineText(true);
}
#Override
public void onClick(#NonNull View widget) {
}
}
Then to use it.
String text = "my text with action";
hideText= new SpannableString(text);
hideText.setSpan(new CustomClickableSpan(){
#Override
public void onClick(#NonNull View widget) {
// your action here !
}
}, 0, text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
yourtextview.setText(hideText);
// don't forget this ! or this will not work !
yourtextview.setMovementMethod(LinkMovementMethod.getInstance());
Hope this will strongly help !
create textview in ur layout
paste this code in ur MainActivity
TextView textview=(TextView)findViewById(R.id.textviewid);
Spannable spannable=new SpannableString("Hello my name is sunil");
spannable.setSpan(new ForegroundColorSpan(Color.BLUE), 0, 5,
Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
textview.setText(spannable);
//Note:- the 0,5 is the size of colour which u want to give the strring
//0,5 means it give colour to starting from h and ending with space i.e.(hello), if you want to change size and colour u can easily
Below works perfectly for me
tvPrivacyPolicy = (TextView) findViewById(R.id.tvPrivacyPolicy);
String originalText = (String)tvPrivacyPolicy.getText();
int startPosition = 15;
int endPosition = 31;
SpannableString spannableStr = new SpannableString(originalText);
UnderlineSpan underlineSpan = new UnderlineSpan();
spannableStr.setSpan(underlineSpan, startPosition, endPosition, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
ForegroundColorSpan backgroundColorSpan = new ForegroundColorSpan(Color.BLUE);
spannableStr.setSpan(backgroundColorSpan, startPosition, endPosition, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
StyleSpan styleSpanItalic = new StyleSpan(Typeface.BOLD);
spannableStr.setSpan(styleSpanItalic, startPosition, endPosition, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
tvPrivacyPolicy.setText(spannableStr);
Output for above code
From the developer docs, to change the color and size of a spannable:
1- create a class:
class RelativeSizeColorSpan(size: Float,#ColorInt private val color: Int): RelativeSizeSpan(size) {
override fun updateDrawState(textPaint: TextPaint?) {
super.updateDrawState(textPaint)
textPaint?.color = color
}
}
2 Create your spannable using that class:
val spannable = SpannableStringBuilder(titleNames)
spannable.setSpan(
RelativeSizeColorSpan(1.5f, Color.CYAN), // Increase size by 50%
titleNames.length - microbe.name.length, // start
titleNames.length, // end
Spannable.SPAN_EXCLUSIVE_INCLUSIVE
)
You can use extension function in Kotlin
fun CharSequence.colorizeText(
textPartToColorize: CharSequence,
#ColorInt color: Int
): CharSequence = SpannableString(this).apply {
val startIndexOfText = this.indexOf(textPartToColorize.toString())
setSpan(ForegroundColorSpan(color), startIndexOfText, startIndexOfText.plus(textPartToColorize.length), 0)
}
Usage:
val colorizedText = "this text will be colorized"
val myTextToColorize = "some text, $colorizedText continue normal text".colorizeText(colorizedText,ContextCompat.getColor(context, R.color.someColor))
viewBinding.myTextView.text = myTextToColorize
Now you can use the CodeView library to highlight patterns with different colors easily, for example, to highlight all URLs inside the text with the blue color you just need to write
CodeView codeView = findViewById(R.id.codeview);
codeView.addSyntaxPattern(Patterns.WEB_URL, Color.BLUE);
codeView.setTextHighlighted(text);
CodeView Repository URL: https://github.com/amrdeveloper/codeview
I got the same issue.
#Dano's answer is absolutely correct. But it doesn't work for me.
After that, I found the issue I have added ClickableSpan. So it will change my color with another color (accent color)
Issue
SpannableStringBuilder will not change color and undline when you add a ClickableSpan after ForegroundColorSpan or UnderlineSpan.
Solution
1. With ClickableSpan
You can Override the updateDrawState method inside ClickableSpan.
In the updateDrawState method, you should remove the super callback.
After that, you should Modify your text paint as required.
2. Without ClickableSpan
Add ForegroundColorSpan to change the text color
Add UnderlineSpan to add underline in text.
First Part **Second Part should be Bold** last Part
This text should be changed using SpannableString
import android.graphics.Typeface.BOLD
import android.text.Spannable
import android.text.Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
import android.text.SpannableString
import android.text.style.BackgroundColorSpan
import android.text.style.ForegroundColorSpan
import android.text.style.StyleSpan
val firstPart = "First Part "
val secondPart = "Second Part should be Bold"
val thirdPart = " last Part"
val finalString = firstPart + secondPart + thirdPart
val sb: Spannable = SpannableString(finalString).also {
// ... Change text Colour
it.setSpan(
ForegroundColorSpan(getColor(requireContext(), R.color.pink)),
finalString.indexOf(secondPart),
finalString.indexOf(secondPart) + secondPart.length,
SPAN_EXCLUSIVE_EXCLUSIVE
)
// ... Make the text Bold
it.setSpan(
StyleSpan(BOLD),
finalString.indexOf(secondPart),
finalString.indexOf(secondPart) + secondPart.length,
SPAN_EXCLUSIVE_EXCLUSIVE
)
// ... Change Background Colour
it.setSpan(
BackgroundColorSpan(getColor(requireContext(), R.color.lightPink)),
finalString.indexOf(secondPart) - 1,
finalString.indexOf(secondPart) + secondPart.length + 1,
SPAN_EXCLUSIVE_EXCLUSIVE
)
}
yourTextView.text = sb