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。