How to swipe ViewPager images automatically using TimeTask

Question

Hi I am new in android and in my app I have a lot of images in my ArrayList that \'s why I want to swipe those images automatically for every 3 seconds with he

Answer 1

try this code: In MainActivity -

int currentIndex=0; //for tracking current item 

Create and set your TimerTask as per your requirement then in run() of TimerTask:

public void run() {
    if((currentIndex+1)>imageId.length() ){
      currentIndex=0;
    }else{
      currentIndex++;
    }
    ViewPager.setCurrentItem(currentIndex);
}

Answer 2

a simple edit to @L. Swifter's code snippet for the ones wondering about variables, I wrapped it all in a method which you can add to your activity after setting the adapter

private void automateViewPagerSwiping() {
    final long DELAY_MS = 500;//delay in milliseconds before task is to be executed
    final long PERIOD_MS = 3000; // time in milliseconds between successive task executions.
    final Handler handler = new Handler();
    final Runnable update = new Runnable() {
        public void run() {
            if (viewPager.getCurrentItem() == adapter.getCount() - 1) { //adapter is your custom ViewPager's adapter
                viewPager.setCurrentItem(0);
            }
            else {
            viewPager.setCurrentItem(viewPager.getCurrentItem() + 1, true);
            }
        }
    };

    timer = new Timer(); // This will create a new Thread
    timer.schedule(new TimerTask() { // task to be scheduled
        @Override
        public void run() {
            handler.post(update);
        }
    }, DELAY_MS, PERIOD_MS);
}

Answer 3

You can use android TabLayout for indicators, ViewPager for slide screen and TimerTask to slide automatic

please check this link for step by step guideline and demo

CLICK HERE

Answer 4

Another version of the answer:-

                    private int currentPage = -1;
                    // start auto scroll of viewpager
                    final Handler handler = new Handler();
                    final Runnable Update = new Runnable() {
                        public void run() {
                            viewPager.setCurrentItem(++currentPage, true);
                            // go to initial page i.e. position 0
                            if (currentPage == NUM_PAGES -1) {
                                currentPage = -1;
                                // ++currentPage will make currentPage = 0
                            }
                        }
                    };

                    timer = new Timer(); // This will create a new Thread
                    timer.schedule(new TimerTask() { // task to be scheduled

                        @Override
                        public void run() {
                            handler.post(Update);
                        }
                    }, 500, 1500);

Answer 5

Try this in your onCreate() method

    final Handler handler = new Handler();
    Timer timer = new Timer();
    final Runnable runnable = new Runnable() {
        public void run() {
            int currentPage=viewPager.getCurrentItem();
            //return to first page, if current page is last page  
            if (currentPage == titleNames.length-1) {
                currentPage = -1;
            }
            viewPager.setCurrentItem(++currentPage, true);
        }
    };
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            handler.post(runnable);
        }
    },DELAY,PERRIOD)

Answer 6

Here is the total code using TimerTask:

public class MainActivity extends AppCompatActivity {

ViewPager viewPager;

Integer[] imageId = {R.drawable.image1, R.drawable.image2, R.drawable.image3, R.drawable.image4};
String[] imagesName = {"image1","image2","image3","image4"};

Timer timer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_layout);

    viewPager = (ViewPager) findViewById(R.id.viewPager);
    PagerAdapter adapter = new CustomAdapter(MainActivity.this,imageId,imagesName);
    viewPager.setAdapter(adapter);

    TimerTask timerTask = new TimerTask() {
        @Override
        public void run() {
            viewPager.post(new Runnable(){

                @Override
                public void run() {
                    viewPager.setCurrentItem((viewPager.getCurrentItem()+1)%imageId.length);
                }
            });
        }
    };
    timer = new Timer();
    timer.schedule(timerTask, 3000, 3000);
}

@Override
protected void onDestroy() {
    timer.cancel();
    super.onDestroy();
}
}