public class DemoApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        // The library needs application context to get process information.
        Init.init(this);
        // Init.init(this, logProxy) enables custom log component
        
        Task task1 = new Task("task1") {

            @Override
            protected void start() {
                doSomeThing();
            }

            // when runs on process which makes the method return true
            @Override
            public boolean runOnProcess(String processName) {
                return processName.equals("cn.zhaiyifan.demo");
            }
        };
        
        // Create a task which is not blocked with 300 milliseconds delay.
        Task task2 = new Task("task2", false, 300) {

            @Override
            protected void start() {
                doSomeThing();
            }
        };

        // Create more tasks named task3, task4, task5, etc.
        ...

        // This is like the two red tasks in the flow picture, task5 depends on task4.
        task5.setParentTask(task4);

        Flow flow = new Flow("flow");
        // Add task1 and task2 to wave1
        flow.addTask(1, task1)
                .addTask(1, task2)
                // Add task3 and task4 to wave2
                .addTask(2, task3)
                .addTask(2, task4)
                // Add task5 and task4 to wave3, task5 can be started only after task4 finished
                .addTask(3, task5);

        Init.start(flow);
    }

// to set thread pool size
Init.setThreadPoolSize(...)

// cancel a started flow
Init.cancel(...)

// get flow status
Init.getFlowStatus(...)

// get specific task status
flow.getTaskStatus(taskName)

// set timeout, may not be useful for application init, but can be used for other init operation
flow.setTimeout(5000)

etc.

public class XXXApplication {

    // for multi-dex apps
    @Override
    protected void attachBaseContext(Context base) {
        // log init
        ...
        // eventbus init...
        ...
        // global variables init
        ...
        // process related
        String processName = ...
        boolean isMainProcess = ...
        ProcessInit.attachBaseContext(this, processName, isMainProcess);
    }

    @Override
    protected void onCreate() {
        // process related
        String processName = ...
        boolean isMainProcess = ...

        // CrashHandler, SafeMode, plugin, image manager, database, download, update, etc init

        ProcessInit.onCreate(this, processName, isMainProcess);
    }

}

public class ProcessInit {
    ...
    public static void onCreate(Application application, boolean isMainProcess, String processName) {
        if (isMainProcess) {

        }
    } else if (processName.contains(PUSH_PROCESS_SUFFIX)) {
        ...
    } else if (processName.contains(WEB_PROCESS_SUFFIX)) {
        ...
    } else if (processName.contains(MUSIC_PROCESS_SUFFIX)) {
        ...
    } else {
        ...
    }
    ...
}