Android HandlerThread源码浅析

本文主要是介绍Android HandlerThread源码浅析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！


/**
* 用于启动具有Looper的新线程的方便类。Looper能够被用于创建Handler。但是类仍然需要调用start()方法，才能开启线程
*/
public class HandlerThread extends Thread {int mPriority; //优先级int mTid = -1;Looper mLooper;//Looper对象，可以用于两个线程之间传递信息public HandlerThread(String name) {super(name);mPriority = Process.THREAD_PRIORITY_DEFAULT;}/*** 构造函数：创建一个带有名称和优先级的HandlerThread   */public HandlerThread(String name, int priority) {super(name);mPriority = priority;}/*** 回调方法，可以被重写，如果需要执行一个Looper的Loop方法*/protected void onLooperPrepared() {}@Overridepublic void run() {mTid = Process.myTid();Looper.prepare();  //启动一个新的区别于主线程的Loopersynchronized (this) {mLooper = Looper.myLooper(); //获取刚刚新建的LoopernotifyAll();}Process.setThreadPriority(mPriority);onLooperPrepared();Looper.loop();mTid = -1;}/*** 方法返回一个本线程中创建的一个Looper。如果线程没有被启动，或者是isAlive()是false，就返回null。 如果这个线程被启动了，这个方法将会阻塞直到Looper被初始化* @return The looper.*/public Looper getLooper() {if (!isAlive()) {return null;}// If the thread has been started, wait until the looper has been created.synchronized (this) {while (isAlive() && mLooper == null) {try {wait();} catch (InterruptedException e) {}}}return mLooper;}/*** 退出该线程的Looper*/public boolean quit() {Looper looper = getLooper();if (looper != null) {looper.quit();return true;}return false;}/*** 安全的退出Looper对象.* <p>* @return True if the looper looper has been asked to quit or false if the* thread had not yet started running.*/public boolean quitSafely() {Looper looper = getLooper();if (looper != null) {looper.quitSafely();return true;}return false;}/*** 返回线程的id. See Process.myTid().*/public int getThreadId() {return mTid;}
}