How to call next pages of ViewPager programmatically?

Question

I am creating ViewPager and want to call the next Pager on Button.OnClickListener. Setting adapter from the following code in Activity:

@EActivity(R.layout.activity_city)
public class CountrySelectionActivity extends Activity {

@ViewById ViewPager viewPager;
@Bean CustomAdapter customAdapter;

@AfterViews
void afterViewCreated(){
    viewPager.setAdapter(customAdapter);
  }
}

Here is the code for CustomAdapter class:

@EBean
public class CustomAdapter extends PagerAdapter {

public CustomAdapter(Context context) {
    mContext = context;
    loadData();   // loading data as in List
}

......
......

@Override
public boolean isViewFromObject(View view, Object object) {
    return view == object;
}

@Override
public void destroyItem(View container, int position, Object object) {
    ((ViewPager) container).removeView((View) object);
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
    TextView firstCountry;
    TextView secondCountry;

    LayoutInflater layoutInflater = LayoutInflater.from(mContext);
    View view = layoutInflater.inflate(R.layout.country_pager_item, container, false);
    ....
    ....
}

Everything is working fine. I can see the ViewPager loading the two countries on every pages.

I can also slide the pages (Previous and Next). But I want to move to next Pager as soon as click on TextView and so on. Is it possible to do it in ViewPager?

Answer 1

Sure! You just have to call viewPager.setCurrentItem(...)

EDIT:

If you're wondering how you can call this method from within your Adapter, here's an example:

public class CustomAdapter extends PagerAdapter {

    // ... other methods

    public static interface Callback {
        public void onNextClick(int nextPage);
    }

    private Callback callback;

    public void setCallback(Callback callback) {
        this.callback = callback;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        TextView firstCountry;
        TextView secondCountry;

        LayoutInflater layoutInflater = LayoutInflater.from(mContext);
        View view = layoutInflater.inflate(R.layout.country_pager_item, container, false);

        secondCountry.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (callback != null){
                        callback.onNextClick(2);
                    }
                }
            });
    }
}

and in your activity:

@AfterViews
void afterViewCreated(){
    customAdapter.setCallback(new Callback() {
        @Override
        public void onNextClick(int nextPage) {
           viewPager.setCurrentItem(nextPage);
        }
    });
    viewPager.setAdapter(customAdapter);
  }
}