Android 开发:如何用 Spanable 替换部分 EditText [英] Android Development: How To Replace Part of an EditText with a Spannable

问题描述

我正在尝试用 span 替换从 getText() 返回的 Editable 的一部分.

I'm trying to replace part of an Editable returned from getText() with a span.

我试过 getText().replace() 但这仅适用于 CharSequences.

I've tried getText().replace() but that's only for CharSequences.

我尝试这样做的原因是我可以一个接一个地突出显示 EditText 的部分(经过一小段延迟后)，而不是通过并突出显示整个 EditText(对于大文件可能会很慢).

The reason I'm trying to do this is so I can highlight sections of an EditText one after another (after a small delay), instead of going through and highlighting the whole EditText (which can be slow with big files).

有人知道我将如何做这件事吗?

Does anyone have a clue about how I'd go about doing this?

推荐答案

这个最小尺寸的例子使first"这个词变大:

This minimal size example makes the word 'first' large:

public class SpanTest extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        String dispStr = "I'm the first line
I'm the second line";
        TextView tv = (TextView) findViewById(R.id.textView1);
        int startSpan = dispStr.indexOf("first");
        int endSpan = dispStr.indexOf("line");
        Spannable spanRange = new SpannableString(dispStr);
        TextAppearanceSpan tas = new TextAppearanceSpan(this, android.R.style.TextAppearance_Large);
        spanRange.setSpan(tas, startSpan, endSpan, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        tv.setText(spanRange);
    }
}

您可以根据自己的需要进行调整

You can adapt it to your needs

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