I have a TextView like below. I used this code to set gray color for a part of the text.
// Prepare result text.
final String resultText = text + "\n\n" + dictionaryName;
final SpannableString styledResultText = new SpannableString(resultText);
styledResultText.setSpan(new ForegroundColorSpan(Color.GRAY), text.length() + 2, text.length() + 2 + dictionaryName.length(), 0);
resultTextView.setText(styledResultText);
Now I want to set align for it. How to do? Android doesn't have any span class for alignment. I can't find out anything like "AlignmentSpan".

AFAIK this is not possible. I would really aim to have those as two different fields. It seems like you have the data separated, why not just create a separate TextView for the grey text (dictionaryName)?
I have tried to use spannables as less as possible for this very reason.
Though its really late to answer, I assume that it might help someone at least. Add this to your code.
styledResultText.setSpan(new AlignmentSpan.Standard(Alignment.ALIGN_OPPOSITE),
text.length() + 2, text.length() + 2 + dictionaryName.length(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
Alignment.ALIGN_OPPOSITE is the equivalent for right side.
Alignment.ALIGN_NORMAL is the equivalent for left side.
I think you should split the text into more than 1 string, put them into separated textview then align one by one.
Hope this helps.
If the resultText is always going to be right-aligned, add the gravity="right" attribute to your resultTextView
instead of trying to right-align the text with styled spannable strings. This is assuming the grey text is within a separate TextView than your main text.
In xml for the result (grey) text:
<TextView android:id="@+id/resultTextView"
android:gravity="right"
android:layout_width="fill_parent" />
来源:https://stackoverflow.com/questions/6654022/multiple-alignment-in-textview