running 2 methods asynchronously

Question

I have 2 methods in onCreate which I need to run one after the other ie...the second method will start once the first method is complete irrespective of how much time it takes.Please help me.

new Handler().postDelayed(new Runnable() {

        /*
         * Showing splash screen with a timer. This will be useful when you
         * want to show case your app logo / company
         */

        @Override
        public void run() {
            // This method will be executed once the timer is over
            // Start your app main activity

               populateList();

            // close this activity
            //finish();
        }
    }, 20000);getContactList();

populateList() method

** public void populateList() {
Log.i("Populate List","Entered");

    Toast.makeText(this,String.valueOf(Common.selectedContactNos.size()),Toast.LENGTH_LONG).show();
   displayRecyclerAdapter = new DisplayRecyclerAdapter(DisplayContacts.this);
   LinearLayoutManager mLinearLayoutManager = new LinearLayoutManager(this);
    recyclerView_contacts.setAdapter(displayRecyclerAdapter);
   recyclerView_contacts.setLayoutManager(mLinearLayoutManager);
   displayRecyclerAdapter.notifyDataSetChanged();
}**

You can use AsyncTask for the same. Call your another method in the postExecute() method of the asynctask. — Vivek Mishra, Nov 09 '17 at 06:00
As @VivekMishra said either you use AsyncTask or RxJava2 for that. — Haresh Chhelana, Nov 09 '17 at 06:01
can somebody please post the complete code calling bot methods first getContactList() and then populateList()? — user8601021, Nov 09 '17 at 06:03
you can use other mechanism for showing splash screen, use SplashActivity with timer, and you willn't have handler\asynctask hell — Alexey Zatsepin, Nov 09 '17 at 09:41
I thought about that about splash has a timer and I am fetching phone contacts and doing 2-3 tasks on it.how do I figure out how much time is required to fetch contacts?It can be 5 contacts on 1 phone and 500 contacts on another — user8601021, Nov 09 '17 at 09:48

Ankit · Answer 1 · 2017-11-09T06:40:21.887

1

just use AsyncTask

call TaskOne class like- new TaskOne().execute();

private class TaskOne extends AsyncTask<Void,Void,Void>
{

    @Override
    protected Void doInBackground(Void... params) {
        getContactList(); 
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        populateList();


    }
}

edited Nov 09 '17 at 06:40

answered Nov 09 '17 at 06:13

Ankit

1,068
6
10

there is no need to create second asynctask you can simply call the other method in post execute – Vivek Mishra Nov 09 '17 at 06:18
populateList method did not get called using only 1 asynctask.do I use two – user8601021 Nov 09 '17 at 06:33
i want getContactList() to run first and then populatelist as will populateData fetched in getContactList() – user8601021 Nov 09 '17 at 06:34
populateList is not working in onPostExecute() method.is it because it populates the recyclerview and should be called in onCreate() Only? – user8601021 Nov 09 '17 at 07:00

score 0 · Answer 2 · answered Nov 09 '17 at 06:06

0

Call both method inside run method with the sequence you want. Replace your code with below code

 new Handler().postDelayed(new Runnable() {

    /*
     * Showing splash screen with a timer. This will be useful when you
     * want to show case your app logo / company
     */

        @Override
        public void run() {
            // This method will be executed once the timer is over
            // Start your app main activity

            populateList();
            getContactList();
            // close this activity
            //finish();
        }
    }, 20000);

answered Nov 09 '17 at 06:06

Abdul Waheed

4,540
6
35
58

But doesn't both methods will be called simultaneously after the time is over ? – Vivek Mishra Nov 09 '17 at 06:21
using this methods are called together.I am fetching some data in getContactList() and then populating in recyclerview in populateList so i want getContactList to be called first – user8601021 Nov 09 '17 at 06:44
so call getContact list first and then call other method – Abdul Waheed Nov 09 '17 at 06:44
i tried like this yesterday and this doesnt work.both are called together – user8601021 Nov 09 '17 at 06:54

running 2 methods asynchronously

2 Answers2