InteractingListenViewPager.java

package com.xiaolongtongxue.vp1;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;

/**
 * A customized view pager which listens when user is interacting with itself.
 */
public class InteractingListenViewPager extends ViewPager {
  public InteractingListenViewPager(Context context) {
    super(context);
  }

  public InteractingListenViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  @Override public boolean onTouchEvent(MotionEvent ev) {
    switch (ev.getAction()) {
      case MotionEvent.ACTION_DOWN:
      case MotionEvent.ACTION_MOVE:
        if (interactingListener != null) {
          interactingListener.on();
        }
        break;
      case MotionEvent.ACTION_UP:
      case MotionEvent.ACTION_CANCEL:
        if (interactingListener != null) {
          interactingListener.off();
        }
        break;
    }
    return super.onTouchEvent(ev);
  }

  private InteractingListener interactingListener;

  public void setInteractingListener(InteractingListener interactingListener) {
    this.interactingListener = interactingListener;
  }

  public interface InteractingListener {
    /** user is interacting with the view pager */
    void on();

    /** user has no interactions with the view pager */
    void off();
  }
}

MainActivity.java

package com.xiaolongtongxue.vp1;

import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v7.app.AppCompatActivity;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
  private static final int DELAY_MILLIS = 2000;

  private InteractingListenViewPager viewPager;

  private Runnable timer = new Runnable() {
    @Override public void run() {
      viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);
      viewPager.postDelayed(this, DELAY_MILLIS);
    }
  };

  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.view_pager);
    viewPager = (InteractingListenViewPager) findViewById(R.id.view_pager);
    viewPager.setPageMargin((int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8, getResources().getDisplayMetrics()));
    viewPager.setAdapter(new SimpleAdapter());

    viewPager.setInteractingListener(new InteractingListenViewPager.InteractingListener() {
      @Override public void on() {
        viewPager.removeCallbacks(timer);
      }

      @Override public void off() {
        viewPager.postDelayed(timer, DELAY_MILLIS);
      }
    });
  }

  @Override protected void onResume() {
    super.onResume();
    viewPager.postDelayed(timer, DELAY_MILLIS);
  }

  @Override protected void onPause() {
    super.onPause();
    viewPager.removeCallbacks(timer);
  }

  static class SimpleAdapter extends PagerAdapter {
    private static final int[] COLORS = new int[]{
        Color.parseColor("#673AB7"),
        Color.parseColor("#FF5722"),
        Color.parseColor("#E91E63"),
    };

    private static final int REAL_COUNT = COLORS.length;

    private final String[] strings;

    public SimpleAdapter() {
      strings = new String[REAL_COUNT];
      for (int i = 0; i < REAL_COUNT; i++) {
        strings[i] = String.format("Page %d", i);
      }
    }

    @Override public int getCount() {
      return Integer.MAX_VALUE;
    }

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

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

    @Override public Object instantiateItem(ViewGroup container, int position) {
      final int i = position % REAL_COUNT;
      final Context context = container.getContext();
      TextView tv = new TextView(context);
      tv.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
      tv.setGravity(Gravity.CENTER);
      tv.setTextColor(Color.WHITE);
      tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, 24);
      tv.setBackgroundColor(COLORS[i]);
      tv.setText(strings[i]);

      container.addView(tv);

      return tv;
    }
  }
}

view_pager.xml

<?xml version="1.0" encoding="utf-8"?>
<com.xiaolongtongxue.vp1.InteractingListenViewPager
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/view_pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />