How to define order (setPriority) of Spannable in Android

Question

I have few overlapping spans within SpannableStringBuilder. I would like to define order in which they will be implemented to Text. Spannable have int flags

int SPAN_PRIORITY = 16711680;
int SPAN_PRIORITY_SHIFT = 16;

How can I use them? How many levels Spannable priority have? What is the default one?

Answer 1

To define priority you have to utilize bits magic:

int priority = 123; // Should be in range [0..255].
int spanFlags = 0;
// ...
// Cleaning up priority bits.
spanFlags &= ~Spannable.SPAN_PRIORITY; 
// Injecting priority bits.
spanFlags |= (priority << Spannable.SPAN_PRIORITY_SHIFT) & Spannable.SPAN_PRIORITY;
// ...
sb.setSpan(what, start, end, spanFlags);