How to Make a Specific Text on Textview Bold

how to make a specific text on TextView BOLD

Just build your String in HTML and set it:

String sourceString = "<b>" + id + "</b> " + name; 
mytextview.setText(Html.fromHtml(sourceString));

How to use Span to make part of TextView Bold untill special character?

Programmatically would be as next:

Java

void format(final TextView view) {

    final CharSequence text = view.getText();

    if (!TextUtils.isEmpty(text)) {
        final int index = text.toString().indexOf(',');

        if (index > 0) {
            final SpannableStringBuilder sb = new SpannableStringBuilder(text);
            sb.setSpan(new StyleSpan(Typeface.BOLD), 0, index, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
            view.setText(new SpannableString(sb));
        }
    }
}

Kotlin

fun format(view: TextView) {

    val text = view.text

    if (!TextUtils.isEmpty(text)) {
        val index = text.indexOf(',')

        if (index > 0) {
            val sb = SpannableStringBuilder(text)
            sb.setSpan(StyleSpan(Typeface.BOLD), 0, index, Spannable.SPAN_INCLUSIVE_EXCLUSIVE)
            view.text = SpannableString(sb)
        }
    }
}

If on the other hand, is a resource string set to never change, then you can set bold tags directly into your strings resource xml file, with <b> </b>:

<string name="string_name"><b>Hello</b>, World</string>

How to make a part of text in TextView bold?

There are many ways to achieve what you want.

1) You can insert HTML inside your text view as explained by "Tanis" here "How to display HTML in TextView?"

((TextView)findViewById(R.id.carmodel)).setText(Html.fromHtml("<h2>CarModel: </h2>") + getCarModel+"");

2) You can create two text views like

((TextView)findViewById(R.id.carmodelBold)).setText("CarModel: ");    
((TextView)findViewById(R.id.carmodel)).setText(getCarModel);   

and style the text view with ID "carmodelBold" as you want.

3) You can create a table

How to make only some Words bold in Text View in XML (Android Studio)?

Try this:

<string name="bold">abc<b>Enter_Text_Here_You_Want_To_BOLD</b>efg</string>

And In XML:

android:text="@string/bold"

Set some text bold in textview, but not everything

From the Android docs: https://developer.android.com/reference/android/text/style/StyleSpan

 SpannableString string = new SpannableString("Bold and italic text");
 string.setSpan(new StyleSpan(Typeface.BOLD), 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
 string.setSpan(new StyleSpan(Typeface.ITALIC), 9, 15, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

Then call textView.setText(string); like you normally would.

EDIT: You can also try using
HtmlCompat.fromHtml(html, HtmlCompat.FROM_HTML_MODE_LEGACY);
which also returns a Spanned of its own.

However, if you're putting this html as a string resource, you will need to escape some XML characters.

Android TextView in BOLD and Normal text

in your strings file

<string name="your_text">
<![CDATA[
<p> <b>Title</b> </p>
<p><b><i>Step 1</i></b><p>step1 content content content  content content content</p></p>
<p><b><i>Step 2</i></b><p>step2 content  content content content  content content content</p></p>
]]>
</string>

Then in your activity

        TextView tv=(TextView)findViewById(R.id.textView1);
        tv.setText(Html.fromHtml(getString(R.string.your_text)));

And output

How to set the font style to bold, italic and underlined in an Android TextView?

I don't know about underline, but for bold and italic there is "bolditalic". There is no mention of underline here: http://developer.android.com/reference/android/widget/TextView.html#attr_android:textStyle

Mind you that to use the mentioned bolditalic you need to, and I quote from that page

Must be one or more (separated by '|') of the following constant values.

so you'd use bold|italic

You could check this question for underline: Can I underline text in an android layout?

How to make part of the text Bold in android at runtime?

Let's say you have a TextView called etx. You would then use the following code:

final SpannableStringBuilder sb = new SpannableStringBuilder("HELLOO");
      
final StyleSpan bss = new StyleSpan(android.graphics.Typeface.BOLD); // Span to make text bold
final StyleSpan iss = new StyleSpan(android.graphics.Typeface.ITALIC); //Span to make text italic
sb.setSpan(bss, 0, 4, Spannable.SPAN_INCLUSIVE_INCLUSIVE); // make first 4 characters Bold 
sb.setSpan(iss, 4, 6, Spannable.SPAN_INCLUSIVE_INCLUSIVE); // make last 2 characters Italic

etx.setText(sb);

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Extract part of string and change it to bold and add it to TextView

Here i made a little example for you. It is exactly what you want.

public class TestActivity extends AppCompatActivity {
    private Button button;
    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);
        button = findViewById(R.id.button_action);
        textView = findViewById(R.id.title);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore [et dolore magna aliquyam erat], sed diam voluptua. ?At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren";
                Pattern pattern = Pattern.compile("\\[[\\w ]+\\]");
                Matcher matcher = pattern.matcher(text);
                while (matcher.find())
                    text = text.replace(matcher.group(), matcher.group().replace("[", "<b>").replace("]", "</b>"));
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                    textView.setText(Html.fromHtml(text, Html.FROM_HTML_MODE_COMPACT));
                } else {
                    textView.setText(Html.fromHtml(text));
                }
            }
        });
    }
}

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