ViewPager实现图片轮播

页面布局代码：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main2"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.chao.myself.Main2Activity">    <android.support.v4.view.ViewPager        android:id="@+id/viewPager"        android:layout_width="match_parent"        android:layout_height="160dp" />    <LinearLayout        android:id="@+id/ll"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/viewPager"        android:gravity="center"        android:orientation="horizontal" /></RelativeLayout>

Activity逻辑代码：

package com.chao.myself;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;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;import java.util.List;/** * 设置界面应该是怎样的 LinearLayout应该设置 * android:layout_alignBottom="@+id/viewPager"  水平朝向 *  * 思路：1.基本功能：定义viewPage 定义图片数组 把图片循环的加入list集合 给viewPage设置适配器 * 这样就是实现了简单的图片滑动 * 2.加上小圆点 点击小圆点切换页面：定义textview(空白的)，给textview加载父容器，ll循环加载 * textview,把textview加到list2集合中去，给viewpage设置滑动监听，给textview设置点击监听事件 * 3.自动滑动 开启定时器 (Touch时设置定时器停止) */public class Main2Activity extends Activity {    private ViewPager viewPager;    private LinearLayout ll;    private int imagearr[] = new int[]{R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d,            R.drawable.e};    private List<ImageView> olist = new ArrayList<>();    private List<TextView> olist2 = new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main2);        init();        viewPager.setAdapter(new MyAdapter());        viewPager.setOnPageChangeListener(listenter);        image_thread();        viewPager.setOnTouchListener(listener3);    }    private int index = 0;    private boolean isstop = false;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case 123:                    viewPager.setCurrentItem(index % imagearr.length);                    break;            }        }    };    private void image_thread() {        new Thread() {            @Override            public void run() {                super.run();                while (true) {                    while (!isstop) {                        try {                            index++;                            handler.sendEmptyMessage(123);                            sleep(2000);                        } catch (Exception e) {                            e.printStackTrace();                        }                    }                }            }        }.start();    }    private void init() {        viewPager = (ViewPager) findViewById(R.id.viewPager);        ll = (LinearLayout) findViewById(R.id.ll);        for (int i = 0; i < imagearr.length; i++) {            ImageView imageView = new ImageView(this);            imageView.setBackgroundResource(imagearr[i]);            olist.add(imageView);            TextView textView = new TextView(this);            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(10, 10);            params.setMargins(0, 0, 5, 0);            textView.setLayoutParams(params);            textView.setBackgroundResource(R.drawable.text_white);            textView.setOnClickListener(listener2);            textView.setTag(i);            olist2.add(textView);            olist2.get(0).setBackgroundResource(R.drawable.text_red);            ll.addView(textView);        }    }    private ViewPager.OnPageChangeListener listenter = new ViewPager.OnPageChangeListener() {        @Override        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {        }        @Override        public void onPageSelected(int position) {            for (TextView textview : olist2) {                textview.setBackgroundResource(R.drawable.text_white);            }            olist2.get(position).setBackgroundResource(R.drawable.text_red);        }        @Override        public void onPageScrollStateChanged(int state) {        }    };    private View.OnClickListener listener2 = new View.OnClickListener() {        @Override        public void onClick(View v) {            int i = (int) v.getTag();            viewPager.setCurrentItem(i);        }    };    private View.OnTouchListener listener3 = new View.OnTouchListener() {        @Override        public boolean onTouch(View v, MotionEvent event) {            switch (event.getAction()) {                case MotionEvent.ACTION_DOWN:                    isstop = true;                    break;                case MotionEvent.ACTION_UP:                    isstop = false;                    break;            }            return false;        }    };    class MyAdapter extends PagerAdapter {        @Override        public int getCount() {            return olist.size();        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view == object;        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            ((ViewPager) container).removeView(olist.get(position));        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            ((ViewPager) container).addView(olist.get(position));            return olist.get(position);        }    }}

实现效果：