在Android的TextView中将HTML文本水平和垂直居中,可以通过以下步骤实现:
以下是示例代码:
public class CustomTagHandler implements Html.TagHandler {
@Override
public void handleTag(boolean opening, String tag, Editable output, XMLReader xmlReader) {
if (tag.equalsIgnoreCase("center")) {
if (opening) {
startCenterTag(output);
} else {
endCenterTag(output);
}
}
}
private void startCenterTag(Editable output) {
output.setSpan(new AlignmentSpan.Standard(Layout.Alignment.ALIGN_CENTER), output.length(), output.length(), Spannable.SPAN_MARK_MARK);
}
private void endCenterTag(Editable output) {
Object obj = getLast(output, AlignmentSpan.Standard.class);
int where = output.getSpanStart(obj);
output.removeSpan(obj);
if (where != output.length()) {
output.setSpan(new AlignmentSpan.Standard(Layout.Alignment.ALIGN_CENTER), where, output.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
private Object getLast(Editable text, Class kind) {
Object[] objs = text.getSpans(0, text.length(), kind);
if (objs.length == 0) {
return null;
} else {
for (int i = objs.length; i > 0; i--) {
if (text.getSpanFlags(objs[i - 1]) == Spannable.SPAN_MARK_MARK) {
return objs[i - 1];
}
}
return null;
}
}
}
在Activity或Fragment中的代码:
TextView textView = findViewById(R.id.textView);
String htmlText = "<center><h1>This is a centered heading</h1></center>";
SpannableStringBuilder spannableStringBuilder = (SpannableStringBuilder) Html.fromHtml(htmlText);
spannableStringBuilder.setSpan(new CustomTagHandler(), 0, spannableStringBuilder.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableStringBuilder);
这样,TextView中的HTML文本就会水平和垂直居中显示了。
注意:以上代码只是示例,实际应用中可能需要根据具体需求进行适当的修改和调整。
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