每行的单独行间距

Question

是否可以为每个文本行定义单独的行间距TextView？

例:

TextView tv = new TextView(context);
tv.setText("line1\nline2\nline3");

该方法setLineSpacing(float add, float mult)定义了所有文本行的行间距TextView.我想在line1和line2之间定义另一个行间距,在line2和line3之间定义不同的行间距.

任何想法如何做到这一点？

spannable是否提供解决方案？

Answer 1

是的,您可以通过使用LineHeightSpan界面来实现.这是一个关于如何执行此操作的快速而脏的示例代码:

public class MyActivity extends Activity {

    private static class MySpan implements LineHeightSpan {
        private final int height;

        MySpan(int height) {
            this.height = height;
        }

        @Override
        public void chooseHeight(CharSequence text, int start, int end, int spanstartv, int v,
                FontMetricsInt fm) {
            fm.bottom += height;
            fm.descent += height;
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final TextView tv = new TextView(this);
        setContentView(tv);

        tv.setText("Lines:\n", BufferType.EDITABLE);
        appendLine(tv.getEditableText(), "Line 1 = 40\n", 40);
        appendLine(tv.getEditableText(), "Line 2 = 30\n", 30);
        appendLine(tv.getEditableText(), "Line 3 = 20\n", 20);
        appendLine(tv.getEditableText(), "Line 4 = 10\n", 10);
    }

    private void appendLine(Editable text, String string, int height) {
        final int start = text.length();
        text.append(string);
        final int end = text.length();
        text.setSpan(new MySpan(height), start, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    }

}

Answer 2

您可以使用 Html 对文本视图执行这些特定样式。试试这个例子，

tv.setText(Html.fromHtml("<h2>Text1</h2><br><p>Text2</p>"));

这里允许的不同类型的标签是，

<a href="...">
<b>
<big>
<blockquote>
<br>
<cite>
<dfn>
<div align="...">
<em>
<font size="..." color="..." face="...">
<h1>
<h2>
<h3>
<h4>
<h5>
<h6>
<i>
<img src="...">
<p>
<small>
<strike>
<strong>
<sub>
<sup>
<tt>
<u>