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android - 如何格式化字符串然后通过注释改变样式

问题描述

我有 3 个字符串本地化

<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>

那么我如何通过注释添加一些参数和修改后的文本。我得到的最大收获就是做这件事

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;
    }

结果在第一种情况下，我在第二个“Test testBold %1$s end”中得到“Test testBold MyValue end”。谁有一些想法？

标签： androidspannablestringspanned

解决方案

1. 将参数转换为注解

你的字符串：

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

变成：

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

2. 从资源创建 SpannableStringBuilder

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

3. 首先应用所有 arg 注释

一个示例实现：

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
                        )
                    }
                }
            }
        }
    }
}

传入参数：

spannableText.applyArgAnnotations("myValue")

4. 应用剩余的注释

spannableText.applyAnnotations()
textView.text = spannableText

5. 结果

测试testBold myValue end

编辑

创建了一个小库来抽象这种行为 - https://github.com/veritas1/tinytextstyler

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