andorid jar/库源码解析之Bolts

目录：andorid jar/库源码解析 

Bolts：

　　作用：

　　　　用于链式执行跨线程代码，且传递数据

　　栗子：

Task.call(new Callable() {
            @Override
            public Boolean call() throws Exception {
                return true;
            }
        }, Task.UI_THREAD_EXECUTOR);

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

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