BaseSampleActivity.java

package com.viewpagerindicator.sample;

import java.util.Random;

import com.viewpagerindicator.PageIndicator;

import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public abstract class BaseSampleActivity extends FragmentActivity {
    private static final Random RANDOM = new Random();

    TestFragmentAdapter mAdapter;
    ViewPager mPager;
    PageIndicator mIndicator;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.random:
                final int page = RANDOM.nextInt(mAdapter.getCount());
                Toast.makeText(this, "Changing to page " + page, Toast.LENGTH_SHORT);
                mPager.setCurrentItem(page);
                return true;

            case R.id.add_page:
                if (mAdapter.getCount() < 10) {
                    mAdapter.setCount(mAdapter.getCount() + 1);
                    mIndicator.notifyDataSetChanged();
                }
                return true;

            case R.id.remove_page:
                if (mAdapter.getCount() > 1) {
                    mAdapter.setCount(mAdapter.getCount() - 1);
                    mIndicator.notifyDataSetChanged();
                }
                return true;
        }
        return super.onOptionsItemSelected(item);
    }
}