如何格式化字符串然后通过注释更改样式

Question

我有 3 个字符串本地化

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

我如何通过注释添加一些参数和修改后的文本。我得到的最大的是做这件事

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？

Answer 1

1. 将参数转换为注释

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. 应用剩余注释

spannableText.applyAnnotations()
textView.text = spannableText

5. 结果

测试testBold myValue结束

编辑

创建了一个小库来抽象此行为 - https://github.com/veritas1/tinytextstyler

Answer 2

Typeface fontBold = Typeface.createFromAsset(getAssets(), "fonts/Trebuchet_MS_Bold.ttf");
    String s = getResources().getString(R.string.error_date, "20.02.2019", "25.02.2019");
    SpannableStringBuilder spannableString = new SpannableStringBuilder(s);

    Integer first1 = null;
    Integer first2 = null;
    Integer last1 = null;
    Integer last2 = null;
    int digits = 0;
    char[] crs = s.toCharArray();
    for (int i = 0; i < crs.length; i++) {
        if (Character.isDigit(crs[i]) && digits != 8) {
            if (first1 == null) {
                first1 = i;
            }
            last1 = i;
            digits++;
            continue;
        }
        if (Character.isDigit(crs[i])) {
            if (first2 == null) {
                first2 = i;
            }
            last2 = i;
        }

    }
    spannableString.setSpan(new CustomTypefaceSpan("", fontBold), first1, last1 + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    spannableString.setSpan(new CustomTypefaceSpan("", fontBold), first2, last2 + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    android.support.v7.app.AlertDialog.Builder builder = new android.support.v7.app.AlertDialog.Builder(getInstance());
    builder.setTitle("test");
    builder.setMessage(spannableString);
    builder.setCancelable(false);
    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            getLoaderManager().destroyLoader(LOADER_SOE_BILLING_ID);
        }
    });
    android.support.v7.app.AlertDialog alert = builder.create();
    alert.show();