Android实现导航页之一动态显示页面下小点

一、创建项目；

二、创建第二个导航页面activity_guide

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;import java.util.ArrayList;public class activity_guide extends AppCompatActivity{private ViewPager guide_ViewPager;private VpAdapter vpAdapter;private static int[] imgs = {R.drawable.a, R.drawable.b, R.drawable.c};private ArrayList imageViews;private ImageView[] dotViews;//小圆点
    private VpAdapter adapter;private LinearLayout dot_Layout;private ViewPager vp;@Override
    protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_guide);initView();}private void initView() {dot_Layout = (LinearLayout) findViewById(R.id.dot_Layout);initImages();initDots();vp = (ViewPager) findViewById(R.id.vp);vpAdapter=new VpAdapter(imageViews);vp.setAdapter(vpAdapter);vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Override
            

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