[英]Use spannable in a loop for a mutable text
So my app should compare the user's input with a random quote provided by the app, and I want to color the correct word with green and the wrong one with red.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,我想用绿色为正确的单词着色,用红色着色错误的单词。 the problem is that I don't know how to do it with Spannable
in a loop, and especially that the text is always changing.问题是我不知道如何在循环中使用Spannable
来做到这Spannable
,尤其是文本总是在变化。
This is the code: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
}
}
}
And this is what I tried: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 + " ");
}
}
But the resulted text isn't colored and they are glued together with no spaces.但结果文本没有着色,它们被粘在一起,没有空格。
It seems that ForegroundColorSpan
/ BackgroundColorSpan
are not reusable and each time we should instantiate a new one.似乎ForegroundColorSpan
/ BackgroundColorSpan
不可重用,每次我们都应该实例化一个新的。 Anyway, I think it makes sense better to write it using SpannableString
like the following:无论如何,我认为使用SpannableString
编写它SpannableString
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);
}
}
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