Question

我有TextView持有某个文字。是否可以在每个时间段内更改TextView中每个单词的背景？例如，突出显示第一个单词，然后是第二个单词，然后是第三个单词，依此类推。

Answer 1

是的，这是可能的。

String html = "hello <font color='#ff0000'>there</font>";
textView.setText(Html.fromHtml(html));

More info here

Supported tags

Mutiple background color in one TextView

Answer 2

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

    textView = (TextView) findViewById(R.id.my_text_view);
    textView.setText("Hello there");
    mMyRunnable.start = 0;
    mMyRunnable.text = textView.getText().toString();
    mHandler = new Handler();
    mHandler.postDelayed(mMyRunnable, 1000);
}

private MyRunnable mMyRunnable = new MyRunnable();

private class MyRunnable implements Runnable{

    String text;
    int start = 0;

    @Override
    public void run () {
        //get the next index of space..notice that this answer assumes that there are no double sapces
        final int end = text.indexOf(32, start);

        Spannable wordSpan = new SpannableString(text);

        //case this is the last word
        if(end == -1){
            wordSpan.setSpan(new ForegroundColorSpan(Color.CYAN), start, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        //color the current word, set start end start handler again
        else{
            wordSpan.setSpan(new ForegroundColorSpan(Color.CYAN), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
            start = end + 1;
            mHandler.postDelayed(mMyRunnable, 1000);
        }

        textView.setText(wordSpan);
    }
}

Answer 3

是的，有可能。可以使用SpannableString作为TextView内容来实现。您将不得不深入了解文档以实现您想要的目标。在您的案例中使用的有用跨度之一是BackgroundColorSpan

突出显示TextView中的单词

3 个答案: