Viewpager auto scroll

This blog is related to viewpager auto scroll.

Create new android studio project.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

pager_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/imgDisplay"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="fitXY" />

</RelativeLayout>

ActivityMain.java

public class SliderViewActivity extends AppCompatActivity {

  public ViewPager viewPager;
    FullFrameDisplayAdapter displayAdapter;
    ArrayList<Integer> datalist;

     int currentCount;
    Intent intent;
    private int clickposition=0;
    public SliderViewActivity() {
        // Required empty public constructor
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_full_frame_display);

        

      datalist.add(R.drawable.image1);

      datalist.add(R.drawable.image2);

     datalist.add(R.drawable.image3);

     datalist.add(R.drawable.image4);

     datalist.add(R.drawable.image5);

    datalist.add(R.drawable.image6);

    datalist.add(R.drawable.image7;

   datalist.add(R.drawable.image8);

        viewPager= (ViewPager)findViewById(R.id.pager);
        intent=getIntent();
        datalist= PassData.getInstance().getListData();
        displayAdapter=new FullFrameDisplayAdapter(this,datalist);
        viewPager.setAdapter(displayAdapter);
        autoPlay(viewPager);
       

    }

  // This method play the infinite scroll
    private void autoPlay(final ViewPager viewPager) {

        viewPager.postDelayed(new Runnable() {
            @Override
            public void run() {
                try {
                    if (displayAdapter != null && viewPager.getAdapter().getCount() > 0) {
                        int position = currentCount % displayAdapter.getCount();
                        currentCount++;
                        viewPager.setCurrentItem(position);
                        autoPlay(viewPager);

                    }
                } catch (Exception e) {
                    Log.e("", "auto scroll pager error.", e);
                }
            }
        }, 1000);
    }


}

FullFrameDisplayAdapter.java

public class FullFrameDisplayAdapter extends PagerAdapter {

    private Activity _activity;
    private ArrayList<Integer> _imagePaths;
    private LayoutInflater inflater;


    // constructor
    public FullFrameDisplayAdapter(Activity activity,
                                  ArrayList< Integer > imagePaths) {
        this._activity = activity;
        this._imagePaths = imagePaths;

    }

    @Override
    public int getCount() {
        return this._imagePaths.size();
    }

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

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        TouchImageView imgDisplay;
        FloatingActionButton btnClose;

        inflater = (LayoutInflater) _activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View viewLayout = inflater.inflate(R.layout.fullframe_item, container,
                false);

        imgDisplay = (TouchImageView) viewLayout.findViewById(R.id.imgDisplay);
        imgDisplay.setImageResource(_imagePaths.get(position));

        ((ViewPager) container).addView(viewLayout);

        return viewLayout;
    }

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

    }
}

Thank you
I hope helps this post.