无限轮播+字幕改变+小圆点联动

xml标题

<?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"
    >
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager_vp"
        android:layout_width="wrap_content"
        android:layout_height="300dp"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#88000000"
        android:gravity="center_horizontal"
        android:padding="8dp"
        android:layout_alignBottom="@+id/viewpager_vp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/viewpager_tv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@android:color/white"
            android:text="枫叶"/>
        <LinearLayout
            android:id="@+id/ll_dots"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center_horizontal">

        </LinearLayout>
    </LinearLayout>
</RelativeLayout>

main 界面

package com.fy.test;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private LinearLayout ll_dots;
    private TextView viewpager_tv;
    private ViewPager viewpager_vp;
    private ArrayList<ImageView> imageViews=new ArrayList<ImageView>();
    private int[] imageResIds={R.mipmap.a,R.mipmap.b,R.mipmap.c,R.mipmap.d,R.mipmap.e};
    private String[] descs = {
            "网页设计师联盟",
            "教程网",
            "PS联盟",
            "25学堂",
            "课工场带你逆袭,助你走向人生巅峰",
    };
    Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 1:
                    int currentItem = viewpager_vp.getCurrentItem();
                    viewpager_vp.setCurrentItem(currentItem+1);
                    sendEmptyMessageDelayed(1,3000);
                    break;
            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        init();
    }

    private void init() {
        ll_dots = findViewById(R.id.ll_dots);
        viewpager_tv = findViewById(R.id.viewpager_tv);
        viewpager_vp = findViewById(R.id.viewpager_vp);
        for (int i = 0; i < imageResIds.length; i++) {
            //创建ImageView
            ImageView imageView = new ImageView(this);
            imageView.setBackgroundResource(imageResIds[i]);
            imageViews.add(imageView);
            dot();
        }
        viewpager_vp.setAdapter(new Myadapter());
        viewpager_vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int i, float v, int i1) {
                int currentItem = viewpager_vp.getCurrentItem();
                changeTextAndDot(currentItem%imageResIds.length);
            }

            @Override
            public void onPageSelected(int i) {

            }

            @Override
            public void onPageScrollStateChanged(int i) {

            }
        });
        //指定VIewPager默认跳转到某页.一般是最大数的一半
        viewpager_vp.setCurrentItem(Integer.MAX_VALUE / 2 - 3);
        handler.sendEmptyMessageDelayed(1,3000);
        //触摸事件
        ViewPagerTouchEvent();

    }

    private void ViewPagerTouchEvent() {
        viewpager_vp.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()){
                    case MotionEvent.ACTION_DOWN:
                        handler.removeMessages(1);
                        break;
                    case MotionEvent.ACTION_MOVE:
                        handler.removeMessages(1);
                        break;
                    case MotionEvent.ACTION_UP:
                        handler.sendEmptyMessageDelayed(1,3000);
                        break;
                }
                return false;
            }
        });
    }

    private void changeTextAndDot(int i) {
        viewpager_tv.setText(descs[i]);
        for (int j = 0; j < imageResIds.length; j++) {
            View childAt = ll_dots.getChildAt(i);
            childAt.setBackgroundResource(j==i ? R.mipmap.dot_focus : R.mipmap.dot_normal);
        }
    }

    private void dot() {
        View view = new View(this);
        view.setBackgroundResource(R.mipmap.dot_normal);
        LinearLayout.LayoutParams layoutParams=new LinearLayout.LayoutParams(8,8);
        layoutParams.leftMargin=8;
        view.setLayoutParams(layoutParams);
        ll_dots.addView(view);
    }

    private class Myadapter extends PagerAdapter {
        @Override
        public int getCount() {
            return Integer.MAX_VALUE;
        }

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

        @NonNull
        @Override
        public Object instantiateItem(@NonNull ViewGroup container, int position) {
            ImageView imageView = imageViews.get(position%imageResIds.length);
            container.addView(imageView);
            return imageView;
        }

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

    @Override
    protected void onDestroy() {
        super.onDestroy();
        handler.removeMessages(1);
    }
}