Bolts：
作用：
用于链式执行跨线程代码，且传递数据栗子：
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Task.call(new Callable<Boolean>() {@Overridepublic Boolean call() throws Exception {return true;}}, Task.UI_THREAD_EXECUTOR);Task.callInBackground(new Callable<Boolean>() {@Overridepublic Boolean call() throws Exception {return false;}});Task.callInBackground(new Callable<Boolean>() {@Overridepublic Boolean call() throws Exception {return true;}}).onSuccess(new Continuation<Boolean, Object>() {@Overridepublic Object then(Task<Boolean> task) throws Exception {if (task.getResult()) {return null;} else {return new Object();}}}, Task.BACKGROUND_EXECUTOR).continueWith(new Continuation<Object, Object>() {@Overridepublic Object then(Task<Object> task) throws Exception {if (task.getResult() == null) {Toast.makeText(getBaseContext(), "null", Toast.LENGTH_SHORT).show();} else {Toast.makeText(getBaseContext(), "not null", Toast.LENGTH_SHORT).show();}return null;}}, Task.UI_THREAD_EXECUTOR); |
源码解读：
在内部通过维护多中 ExecutorService 对象，并且通过串联的方式进行调用。
并且通过维护内部变量在，在指定流程处，就是特定的，值，值通过Task的对象getResult拿到。
UIThread
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/*** An {@link java.util.concurrent.Executor} that runs tasks on the UI thread.*/private static class UIThreadExecutor implements Executor {@Overridepublic void execute(Runnable command) {new Handler(Looper.getMainLooper()).post(command);}} |
BackgroundThread
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private BoltsExecutors() {background = !isAndroidRuntime()? java.util.concurrent.Executors.newCachedThreadPool(): AndroidExecutors.newCachedThreadPool();scheduled = Executors.newSingleThreadScheduledExecutor();immediate = new ImmediateExecutor();} |
源码：https://github.com/BoltsFramework/Bolts-Android
引入：
implementation 'com.parse.bolts:bolts-android:1.2.0'
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/Supperlitt/p/12833462.html
