如何在Android中定义可跨度的顺序(SetPriority)

Question

我在SpannableStringBuilder中几乎没有重叠的跨度。我想定义将它们实施到文本的顺序。跨度有int旗

int SPAN_PRIORITY = 16711680;
int SPAN_PRIORITY_SHIFT = 16;

我该如何使用它们？有多少级别可跨度优先级？什么是默认一个？

Answer 1

要定义 priority，您必须利用位魔术：

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);