Develop Reference

How do I set different font sizes to a string (that is highlighted, underlined) in a textview

I am displaying text in a textview without using toString(), to keep the formatting(bold, underline, italics) within the text. But now I want to set different font sizes to _etheadertext ,_etheadertext3 etc..
String header = _etheadertext.getText() + "\n" + _etheadertext3.getText() + "\n" + _etheadertext4.getText() + "\n" + _etheadertext5.getText();

You can use text Spans to apply formatting to parts of a string.
SpannableString spannablecontent=new SpannableString(content.toString());
//set a Style Span to apply Typeface style
spannablecontent.setSpan(new StyleSpan(android.graphics.Typeface.BOLD_ITALIC),
0,spannablecontent.length(), 0);
You can set RelativeSizeSpan to change the text sizes if required.
And then finally, set the spanned string in a TextView.
mTextView.setText(spannablecontent);

How do I change color of a certain part of my textview?

I am using 2 parts in a textview, 1st part is date another is name and email.
They are both referenced in the same textview. I would like to change the color of the date to give it a different visual it from name and email. is it possible to do this without actually adding a whole new textview for name and email?
Here's my code so far:
String nameandemail;
holder.mytext.setText(String.valueOf(dateFormat.format(new Date(msg.getDate())) + " " + nameandemail + ": "));
How do I make it such that I can set the color of date with
holder.mytext.setTextColor(Color.white) and for the nameandemail string something like green?
Thanks!

You can Use spans.
final SpannableStringBuilder sb = new SpannableStringBuilder("your text here");
// Set text color to some RGB value
final ForegroundColorSpan fcs = new ForegroundColorSpan(Color.rgb(158, 158, 158));
// Make text bold
final StyleSpan bss = new StyleSpan(android.graphics.Typeface.BOLD);
// Set the text color for first 6 characters
sb.setSpan(fcs, 0, 6, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
// make them also bold
sb.setSpan(bss, 0, 4, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
textView.setText(sb);
You can also use html like below
myTextView.setText(Html.fromHtml(text + "<font color=white>" + some_text + "</font><br><br>"
+ some_text));

you could define a String in your strings.xml file
<string name="test2"><font color=\'#FFFFFF\'>%1$s</font> -- <font color=\'#00FF00\'>%2$s</font></string>
and then programmatically
TextView tv = (TextView) findViewById(R.id.test);
tv.setText(Html.fromHtml(getString(R.string.test2, String.valueOf(dateFormat.format(new Date(msg.getDate())), nameandemail)));

My recommendation would be to use Spannable.
Here is a short utils method I wrapped up for you to use. You simply need to pass your TextView, your full text and the single part to be re-colored from the full text.
You can place this method to a Utils class and call it whenever you want, or keep it in a single Activity or Fragment(or wherever else) if you use it in a single class:
public static void colorText(TextView view, final String fullText, final String whiteText) {
if (fullText.length() < whiteText.length()) {
throw new IllegalArgumentException("'fullText' parameter should be longer than 'whiteText' parameter ");
}
int start = fullText.indexOf(whiteText);
if (start == -1) {
return;
}
int end = start + whiteText.length();
SpannableStringBuilder finalSpan = new SpannableStringBuilder(fullText);
// finalSpan.setSpan(new ForegroundColorSpan(ContextCompat.getColor(view.getContext(),R.color.your_own_color_code)), start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
finalSpan.setSpan(new ForegroundColorSpan(Color.WHITE), start, end, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
view.setText(finalSpan);
}

Applying dimensions from dimens.xml to text formatted with Html.fromHtml

I have this code for setting the text of a TextView:
TextView txt = new TextView(this);
txt.setText(Html.fromHtml("<b>" + m.getTitle() + "</b>" + "<br />" + "<small>" + m.getText() + "</small>" + "<br />");
The <small> mark is working, but I'd like to set the text size according to my dimensions defined in the dimens.xml file, which I use for all other text in my application. Adding the TextView through an xml layout is not an option since I don't know how many TextViews I'll be adding.
Dimensions in the dimens.xml file are set up like <dimen name="text_size_320dp_small">16sp</dimen>.
How can I apply these dimensions to my text formatted with Html.fromHtml?
Thanks a lot.

I have tested following code myself. You can do it like this.
txt.setText(Html.fromHtml("<b>" + m.getTitle() + "</b>" + "<br />"
+ "<font textsize="
+ getResources().getDimension(R.dimen.text_size_320dp_small) + ">" + m.getText()
+ "</font>" + "<br />"));

[Updated]:
Just came up with some references and updates :
You can store this in strings.xml
<string name="mystring"><font size = "%s"></string>
In code you can write as:
int sptopx = getResources().getDimensionPixelSize(R.dimen.text_size_320dp_small);
Spanned modified = Html.fromHtml( context.getString(R.string.mystring, sptopx) );
myTextView.setText(spanned);
TextView txt = new TextView(this);
txt.setText(
Html.fromHtml(
"<b>" + m.getTitle() + "</b>" +
"<br />" +
modified +
">" + m.getText() + "</font>" +
"<br />"
)
);
for details about html tags support in TextViews you can check this link.

You can't directly, the small tag creates a RelativeSizeSpan with a proportion of .8f, which is hardcoded into the implementation of Html.fromHtml.
Leaves two options that I can see, set the text size to 20sp (which would make small work out to 16sp). Probably not ideal.
The other option is to use a custom tag <mySmall> by replacing all occurrences of <small> and </small> with <mySmall>& </mySmall>. And then call fromHtml (String source, Html.ImageGetter imageGetter, Html.TagHandler tagHandler) with a TagHandler that integrates a AbsoluteSizeSpan into the output Editable.

Why don't you use txt.setSizeText(yoursize)? However you can retrieve your dimensions using this:
float yourDimen = getResources().getDimension(R.dimen.your_dimen_name);

Update "Log.i" in TextView with ScrollBar

I have in my layout.xml a TextView with "id = txtLog".
Where do the test results from my application using:
Log.i("Result:", "Value of x = " + x);
for show result in LogCat.
It is possible to show these results "Log.i" within the TextView?
Note: I left a space at the bottom of my application to show the TextView.
Like a console.
I would like to display these messages on TextView.
If possible create a scroll bar and display every time I use Log.i
I am a beginner, do not know if it is possible. Yet thanks.

I would think
myTextView.setText(myTextView.getText() + "Value of x = " + x + "\n");
would work.
EDIT:
Also, to make the TextView scrollable, you need to set a movement method like so:
myTextView.setMovementMethod(new ScrollingMovementMethod());
EDIT 2:
If you want the information to go to both Log.i and a TextView, then you need a method that holds a reference to the TextView you want to update.
public static void LogToView(TextView myTextView, String title, String message) {
Log.i(title, message);
myTextView.setText(myTextView.getText() + title + ": Value of x = " + x + "\n");
}
Put that in whatever class or in your Activity class. Use it instead of Log.i and the message will be passed to both.

Using size HTML attribute in TextView

I have the following:
textView.setText(Html.fromHtml("<font color=\"red\" size=\"24\">Hello</font>"));
The string 'Hello' does turn red but the size does not change.
It is as if the size attribute is just ignored, does anyone know why this is? Am I doing something wrong?

Size attribute seems not working.
You can use <small> or <big> (multiple times to increase the effect)
You can also use <h1> to <h6> (Header only, i.e. add a new line)
Its old-fashion, but it works well !

Yes, size attribute just ignored. Only "color" and "face" attributes are taken into account.
From Html class sources:
private void handleStartTag(String tag, Attributes attributes) {
if (tag.equalsIgnoreCase("br")) {
// We don't need to handle this. TagSoup will ensure that there's a </br> for each <br>
// so we can safely emite the linebreaks when we handle the close tag.
}
...
else if (tag.equalsIgnoreCase("font")) {
startFont(mSpannableStringBuilder, attributes);
}
...
}
private static void startFont(SpannableStringBuilder text,
Attributes attributes) {
String color = attributes.getValue("", "color");
String face = attributes.getValue("", "face");
int len = text.length();
text.setSpan(new Font(color, face), len, len, Spannable.SPAN_MARK_MARK);
}

Try this one,Its working for me,use small,big key words
TextView mBox = (TextView) findViewById(R.id.txt);
mBox.setText(Html.fromHtml("<font color=#cc0029>" + "<b>"
+ "Hiiiiiiiiii" + "</b>" + "<br />" + "<small>" + "description"
+ "</small>" + "<br />" + "<small>" + "DateAdded" + "</small>"));

Sergey Gotov is right. The only way to change text size it to use h1 - h6 tags.
EDIT: You can also implement TagHandler and use your own tags.

Look at Formatting and Styling on the android developpers site:
http://developer.android.com/guide/topics/resources/string-resource.html#FormattingAndStyling
Or, on this old post of StackOverflow :
Highlighting Text Color using Html.fromHtml() in Android?