注意：此答案已引起广泛关注，我需要对其进行更新。自从原始答案发布以来，@ dzeikei的评论几乎和原始答案一样受到关注。因此，这里有两种可能的解决方案：
确保您的后台工作线程可以访问Context对象（可以是Application上下文或Service上下文）。然后只需在后台工作线程中执行此操作：
// Get a handler that can be used to post to the main thread
Handler mainHandler = new Handler(context.getMainLooper());
Runnable myRunnable = new Runnable() {
@Override
public void run() {....} // This is your code
};
mainHandler.post(myRunnable);
2.如果您的后台线程没有（或不需要）Context对象
（由@dzeikei建议）：
// Get a handler that can be used to post to the main thread
Handler mainHandler = new Handler(Looper.getMainLooper());
Runnable myRunnable = new Runnable() {
@Override
public void run() {....} // This is your code
};
mainHandler.post(myRunnable);
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