How formatted string and then change style by annotations

Question

i have 3 strings localizations

<string name="tests" formatted="true">Test<annotation font="bold"> testBold %1$s</annotation> end</string>
<string name="tests" formatted="true">Тест<annotation font="bold"> тестБолд %1$s</annotation> конец</string>
<string name="tests" formatted="true">Тест<annotation font="bold"> тестБолд %1$s</annotation> кінець</string>

How i can add some argument and modified text by annotation then. The maximum that I get is to do this one thing

CharSequence t = getResources().getString(R.string.tests, "myValue");//in this case i lose my annotation, but set my argument
//OR
CharSequence t = getText(R.string.tests);//in this case i lose my argument but get style BOLD

public SpannableString textFormattingByTags(CharSequence t) {
        SpannedString titleText = new SpannedString(t);
        SpannedString titleText = (SpannedString) getText(R.string.tests);
        Annotation[] annotations = titleText.getSpans(0, titleText.length(), Annotation.class);
        SpannableString spannableString = new SpannableString(titleText);
        for (Annotation annotation : annotations) {
            if (annotation.getKey().equals("font")) {
                String fontName = annotation.getValue();
                if (fontName.equals("bold")) {
                    spannableString.setSpan(new CustomTypefaceSpan("",fontBold),
                            titleText.getSpanStart(annotation),
                            titleText.getSpanEnd(annotation),
                            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                }
            }
        }
        return spannableString;
    }

result in first case i get "Test testBold MyValue end" in second "Test testBold %1$s end". Who had some ideas?

Answer 1

1. Convert arguments to annotations

Your string:

<string name="tests" formatted="true">Test<annotation font="bold"> testBold %1$s</annotation> end</string>

Becomes:

<string name="tests">Test<annotation font="bold"> testBold <annotation arg="0">%1$s</annotation></annotation> end</string>

2. Create SpannableStringBuilder from resource

val text = context.getText(R.string.tests) as SpannedString
val spannableText = SpannableStringBuilder(text)

3. Apply ALL arg annotations FIRST

An example implementation:

fun SpannableStringBuilder.applyArgAnnotations(vararg args: Any) {
    val annotations = this.getSpans(0, this.length, Annotation::class.java)
    annotations.forEach { annotation ->
        when (annotation.key) {
            "arg" -> {
                val argIndex = Integer.parseInt(annotation.value)
                when (val arg = args[argIndex]) {
                    is String -> {
                        this.replace(
                            this.getSpanStart(annotation),
                            this.getSpanEnd(annotation),
                            arg
                        )
                    }
                }
            }
        }
    }
}

Pass in arguments:

spannableText.applyArgAnnotations("myValue")

4. Apply remaining annotations

spannableText.applyAnnotations()
textView.text = spannableText

5. Result

Test testBold myValue end

Edit

Created a small lib to abstract this behaviour - https://github.com/veritas1/tinytextstyler