轮播图

.activity_two.xml

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

    <android.support.v4.view.ViewPager
        android:id="@+id/vp3"
        android:layout_width="wrap_content"
        android:layout_height="250dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#88000000"
        android:orientation="vertical"
        android:padding="8dp"
        android:gravity="center_horizontal"
        android:layout_alignBottom="@+id/vp3">

        <LinearLayout
            android:id="@+id/dian"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">


        </LinearLayout>

    </LinearLayout>

</RelativeLayout>

.TwoActivity

package com.example.lll.yuekaomoni;

import android.os.AsyncTask;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.example.lll.yuekaomoni.adapter.BannerAdapter;
import com.example.lll.yuekaomoni.bean.BNews;
import com.example.lll.yuekaomoni.util.Httputil;
import com.google.gson.Gson;

import java.util.List;

public class TwoActivity extends BaseActivity {

    private ViewPager vp3;
    private BannerAdapter bannerAdapter;
    private LinearLayout dian;

    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
     
       int currentItem = vp3.getCurrentItem();
            if (currentItem==bannerAdapter.getList().size()-1){
                currentItem=0;
            }else{
                currentItem++;
            }
            vp3.setCurrentItem(currentItem);
            handler.sendEmptyMessageDelayed(0,2000);
        }
    };

    @Override
    protected void initData() {

    }

    @Override
    protected void initView() {
        vp3 = findViewById(R.id.vp3);
        dian = findViewById(R.id.dian);

        bannerAdapter = new BannerAdapter(getLayoutInflater());
        vp3.setAdapter(bannerAdapter);
        httpData();
        handler.sendEmptyMessageDelayed(0,2000);
    }

    private void httpData() {
        final String path = "http://www.xieast.com/api/banner.php";

        new AsyncTask<String,String,List<BNews.DataBean>>(){
            @Override
            protected List<BNews.DataBean> doInBackground(String... strings) {
                //调用网络请求工具类
                String string = Httputil.getString(path);
                BNews bNews = new Gson().fromJson(string, BNews.class);
                return bNews == null ? null : bNews.getData();
            }

            @Override
            protected void onPostExecute(List<BNews.DataBean> resultData) {
                super.onPostExecute(resultData);
                bannerAdapter.setDatas(resultData);
            }
        }.execute(path);
    }


    @Override
    protected int initContentView() {
        return R.layout.activity_two;
    }
}