Handler 源码分析
2021/6/29 11:20:52
本文主要是介绍Handler 源码分析,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
App启动的入口
ActivityThread.java
public static void main(String[] args) { ... Looper.prepareMainLooper(); ... ActivityThread thread = new ActivityThread(); thread.attach(false, startSeq); if (sMainThreadHandler == null) { sMainThreadHandler = thread.getHandler(); } Looper.loop(); }
Looper.java
static final ThreadLocal<Looper> sThreadLocal = new ThreadLocal<Looper>(); ...... private Looper(boolean quitAllowed) { mQueue = new MessageQueue(quitAllowed); mThread = Thread.currentThread(); } ...... private static void prepare(boolean quitAllowed) { if (sThreadLocal.get() != null) { throw new RuntimeException("Only one Looper may be created per thread"); } sThreadLocal.set(new Looper(quitAllowed)); } public static void prepareMainLooper() { prepare(false); synchronized (Looper.class) { if (sMainLooper != null) { throw new IllegalStateException("The main Looper has already been prepared."); } sMainLooper = myLooper(); } } public static @Nullable Looper myLooper() { return sThreadLocal.get(); }
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