如何讓用戶突出顯示 TextView

Question

我正在為學生開發一個帶有一些 TextViews 的 Android 項目，但我希望用戶長按並選擇以不同的顏色突出顯示內容的某些部分，就像在某些聖經應用程序或 Adob​​e Reader 中發生的那樣。 標記文本顏色的選項在長按時發生。 我將不勝感激任何使這項工作的指南。

Answer 1

使用 Spannable 字符串設置測試示例的樣式：

String firstWord = "Hello";
String secondWord = "World!";

TextView tvHelloWorld = (TextView)findViewById(R.id.tvHelloWorld);

// Create a span that will make the text red
ForegroundColorSpan redForegroundColorSpan = new ForegroundColorSpan(
        getResources().getColor(android.R.color.holo_red_dark));

// Use a SpannableStringBuilder so that both the text and the spans are mutable
SpannableStringBuilder ssb = new SpannableStringBuilder(firstWord);

// Apply the color span
ssb.setSpan(
        redForegroundColorSpan,            // the span to add
        0,                                 // the start of the span (inclusive)
        ssb.length(),                      // the end of the span (exclusive)
        Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); // behavior when text is later inserted into the SpannableStringBuilder
                                           // SPAN_EXCLUSIVE_EXCLUSIVE means to not extend the span when additional
                                           // text is added in later

// Add a blank space
ssb.append(" ");

// Create a span that will strikethrough the text
StrikethroughSpan strikethroughSpan = new StrikethroughSpan();

// Add the secondWord and apply the strikethrough span to only the second word
ssb.append(secondWord);
ssb.setSpan(
        strikethroughSpan,
        ssb.length() - secondWord.length(),
        ssb.length(),
        Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

// Set the TextView text and denote that it is Editable
// since it's a SpannableStringBuilder
tvHelloWorld.setText(ssb, TextView.BufferType.EDITABLE);

來源： https : //guides.codepath.com/android/Working-with-the-TextView