在循环中对可变文本使用 spannable

Question

所以我的应用程序应该将用户的输入与应用程序提供的随机引用进行比较，我想用绿色着色正确的词，用红色着色错误的词。 问题是我不知道如何在循环中使用 Spannable 来完成它，尤其是文本总是在变化。

这是代码：

if(quoteWords.length == resultWords.length){
                    
     for(int i = 0; i < quoteWords.length; i++) {
                        
         if (quoteWords[i].equals(resultWords[i])) { 
             //color the word with green               
         } else {
             //color the word with red               
         }
     }
                    
}

这就是我尝试过的：

    if(quoteWords.length == resultWords.length){
         SpannableStringBuilder fullStyledSentence = new SpannableStringBuilder();
         ForegroundColorSpan correctColor = new ForegroundColorSpan(Color.GREEN);
         ForegroundColorSpan wrongColor = new ForegroundColorSpan(Color.RED);
         int start;
    
         for(int i = 0; i < quoteWords.length; i++) {
              start = fullStyledSentence.length(); //get length of current SpannableString
              fullStyledSentence.append(quoteWords[i]);
    
              if (quoteWords[i].equals(resultWords[i])) { //color each word using its length
                    fullStyledSentence.setSpan(correctColor, start, start + quoteWords[i].length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                    Log.i("AzureSpeechRecognition", "word number " + i + "is correct");
                    } else {
                       fullStyledSentence.setSpan(wrongColor, start, start + quoteWords[i].length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                       Log.i("AzureSpeechRecognition", "word number " + i + "is wrong");
                    }
    
                       mQuoteBodyTextView.setText(null); //to delete repeatedly appended text
                       mQuoteBodyTextView.append(fullStyledSentence + " ");
              }
                        
     }

但是生成的文本没有着色，并且没有空格地粘在一起。

Answer 1

好像ForegroundColorSpan/BackgroundColorSpan是不可重复使用的，每次我们都应该实例化一个新的。无论如何，我认为使用 SpannableString 编写它更有意义，如下所示：

public class MainActivity extends AppCompatActivity {

    // replacing all whitespaces with single space
    private String quote = "I want to color the correct word with green".replaceAll("\s+", " ");
    private String result = "I want to color the right word with blue".replaceAll("\s+", " ");

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String[] quoteWords = quote.split("\s");
        String[] resultWords = result.split("\s");

        SpannableString spannableQuote = new SpannableString(quote);

        if (quoteWords.length == resultWords.length) {
            int index = 0;
            for (int i = 0; i < quoteWords.length; i++) {
                spannableQuote.setSpan(
                    new BackgroundColorSpan(quoteWords[i].equals(resultWords[i]) ? Color.GREEN : Color.RED),
                    index,
                    index + quoteWords[i].length(),
                    SpannableString.SPAN_INCLUSIVE_INCLUSIVE
                );
                index += quoteWords[i].length() + 1; // 1 for the space between words
            }
        }

        ((TextView) findViewById(R.id.textView1)).setText(result);
        ((TextView) findViewById(R.id.textView2)).setText(spannableQuote);
    }
}

在循环中对可变文本使用 spannable

Use spannable in a loop for a mutable text

java

android

spannable

android-text-color

spannablestringbuilder

结果：