Why doesn't my text show up with style when using SpannableStringBuilder?

问题

I have a problem with a SpannableString object.

Below's a short example:

SpannableString spanstr = new SpannableString("Bold please!");
spanstr.setSpan(new StyleSpan(Typeface.BOLD), 0, spanstr.length(), 0);

SpannableStringBuilder sb = new SpannableStringBuilder();
sb.append(spanstr);
sb.append("\n"); // A newline
sb.append("The first line is bold. This one isn't.");

CharSequence cq = sb.subSequence(0, sb.length());
// ^There's no such method to return a SpannableString,
// so I try to return a CharSequence instead.

// And then, at last:
TextView contentView = (TextView) findViewById(R.id.some_id);
contentView.setText(cq);

What the example's trying to do is showing this:

Bold please!
The first line is bold. This one isn't.

But the problem is: the first line of the text won't show up in bold.

Why doesn't it do it expected?

回答1:

Use the spannable string builder for setting as text in textview :

contentView.setText(sb);

or else you can do like this :

SpannableStringBuilder spanstr = new SpannableStringBuilder("Bold please!");
spanstr.setSpan(new StyleSpan(Typeface.BOLD), 0, spanstr.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spanstr.append("\n");
spanstr.append("The first line is bold. This one isn't.");
contentView.setText(spanstr);

回答2:

use SpannableStringBuilder instance itself.

contentView.setText(sb);

output with your code:

回答3:

Try the below. You need to set the spannable string to the textview. So set the spannable string to your text as below

String s= "The first line is bold. This one isn't";
String title="Bold Please!";  
TextView tv = (TextView) findViewById(R.id.some_id);
tv.setText("");
SpannableString ss1=  new SpannableString(title);
ss1.setSpan(new StyleSpan(Typeface.BOLD), 0, ss1.length(), 0);
tv.append(ss1);
tv.append("\n");
tv.append(s);

I tried the above and you can see the resulting snapshot below.

来源：https://stackoverflow.com/questions/16060991/why-doesnt-my-text-show-up-with-style-when-using-spannablestringbuilder