android - 如何在Android中定义Spannable的顺序(setPriority)

Question

我在 SpannableStringBuilder 中几乎没有重叠跨度。我想定义将它们实现到文本的顺序。Spannable 有 int 标志

int SPAN_PRIORITY = 16711680;
int SPAN_PRIORITY_SHIFT = 16;

我该如何使用它们？ Spannable优先级有多少级？默认值是多少？

Answer 1

要定义优先级，您必须使用位魔法:

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);