Andorid jar库源码Bolts原理解析

Bolts： 　　作用： 　　　　用于链式执行跨线程代码，且传递数据

　　栗子： 复制代码 Task.call(new Callable<Boolean () { @Override public Boolean call() throws Exception { return true; } }, Task.UI_THREAD_EXECUTOR);

Task.callInBackground(new Callable<Boolean () { @Override public Boolean call() throws Exception { return false; } });

Task.callInBackground(new Callable<Boolean () { @Override public Boolean call() throws Exception { return true; } }).onSuccess(new Continuation<Boolean, Object () { @Override public Object then(Task<Boolean task) throws Exception { if (task.getResult()) { return null; } else { return new Object(); } } }, Task.BACKGROUND_EXECUTOR).continueWith(new Continuation<Object, Object () { @Override public 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); 复制代码 　　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

复制代码 /** * An {@link java.util.concurrent.Executor} that runs tasks on the UI thread. */ private static class UIThreadExecutor implements Executor { @Override public void execute(Runnable command) { new Handler(Looper.getMainLooper()).post(command); } } 复制代码 　　BackgroundThread

复制代码 private BoltsExecutors() { background = !isAndroidRuntime() ? java.util.concurrent.Executors.newCachedThreadPool() : AndroidExecutors.newCachedThreadPool(); scheduled = Executors.newSingleThreadScheduledExecutor(); immediate = new ImmediateExecutor(); } 复制代码 　　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。