android规定不允许子线程更新UI,在ViewRootImpl 类中很多操作UI的方法都会调用checkThread()方法检查线程,如果当前线程与创建ViewRootImpl (mThread )的线程不一致就会报“Only the original thread that created a view hierarc…
LOOP 类似于goto
we can define a label as follows:
:label
:start
:end
:up
In the above example, a name after colon(:) implies the label name.
:label的形式就是一个label
To jump to a specific label, we can use the b command followed by the label name…