Viewpager小圆点ImageLoader加载

布局：

<?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:layout_width="match_parent"    android:layout_height="match_parent"    >    <android.support.v4.view.ViewPager        android:id="@+id/view_pager"        android:layout_width="match_parent"        android:layout_height="200dp"        ></android.support.v4.view.ViewPager>    <LinearLayout        android:id="@+id/linear_layout"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/view_pager"        android:layout_centerHorizontal="true"        android:layout_marginTop="20dp"        android:orientation="horizontal"        >    </LinearLayout></RelativeLayout>

首页：

MainActivity:

package a13_viewpager.a13_viewpager;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.widget.ImageView;import android.widget.LinearLayout;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private ViewPager viewPager;    private List<String> list;    private Handler handler=new Handler(){        @Override        public void handleMessage(Message msg) {            if (msg.what==0){                int currentItem = viewPager.getCurrentItem();                viewPager.setCurrentItem(currentItem+1);                handler.sendEmptyMessageDelayed(0,3000);            }        }    };    private List<ImageView> images;    private LinearLayout linearLayout;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        viewPager = (ViewPager) findViewById(R.id.view_pager);        linearLayout = (LinearLayout) findViewById(R.id.linear_layout);        list = new ArrayList<>();        list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505151721118&di=649c9a43aed72fbc4d99ec1a031510c6&imgtype=0&src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F015c7d574b9f8f6ac72525aee98351.jpg");        list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505151956771&di=0eb6f306991d24b67a13ceb336f80102&imgtype=0&src=http%3A%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2F00613def3f1beb7a35ae136341be2b589bc46a2d.jpg_320x200.jpg");        list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505151847685&di=c7a4b5d08ec43fa629bcb690039a7629&imgtype=0&src=http%3A%2F%2Fattimg.dospy.com%2Fimg%2Fday_080625%2F20080625_2e91a10c444877e88827vri2ZKdGMvQo.jpg");        list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505151825129&di=70bf74b87d8a15cb91a2d79f15ed0eaf&imgtype=0&src=http%3A%2F%2Fattimg.dospy.com%2Fimg%2Fday_081016%2F20081016_fee215664d5740e56c13E2YB8giERFEX.jpg");        list.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505746504&di=930c4d677a02328a142d6fa85ed14580&imgtype=jpg&er=1&src=http%3A%2F%2Fattimg.dospy.com%2Fimg%2Fday_090113%2F20090113_6ac58b42bea94f0b318e1B6BZb5lPZl5.jpg");        initnoc();        ViewpagerAdapter adapter=new ViewpagerAdapter(MainActivity.this,list,handler);        viewPager.setAdapter(adapter);                viewPager.setCurrentItem(list.size()*10000);        handler.sendEmptyMessageDelayed(0,3000);        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {                for (int i=0;i<images.size();i++){                    if (i==position%images.size()){                        images.get(i).setImageResource(R.drawable.doc_selcect);                    }else{                        images.get(i).setImageResource(R.drawable.doc_selcect_no);                    }                }            }            @Override            public void onPageScrollStateChanged(int state) {            }        });    }    private void initnoc() {        images = new ArrayList<>();        linearLayout.removeAllViews();        for (int i=0;i<list.size();i++){            ImageView imageView=new ImageView(MainActivity.this);            if (i==0){                imageView.setImageResource(R.drawable.doc_selcect);            }else{                imageView.setImageResource(R.drawable.doc_selcect_no);            }            images.add(imageView);            LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);            params.setMargins(5,0,5,0);            linearLayout.addView(imageView,params);        }    }}

adapter:

package a13_viewpager.a13_viewpager;import android.content.Context;import android.os.Handler;import android.support.v4.view.PagerAdapter;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.Toast;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;import java.util.List;/** * Created by Lenovo on 2017/9/12. */public class ViewpagerAdapter extends PagerAdapter{    Context context;    List<String> list;    Handler handler;    public ViewpagerAdapter(Context context, List<String> list, Handler handler) {        this.context=context;        this.list=list;        this.handler=handler;        ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(context));    }    @Override    public int getCount() {        return Integer.MAX_VALUE;    }    @Override    public boolean isViewFromObject(View view, Object object) {        return view==object;    }    @Override    public Object instantiateItem(ViewGroup container, int position) {        final ImageView imageView=new ImageView(context);        ImageLoader.getInstance().displayImage(list.get(position%list.size()),imageView);        imageView.setScaleType(ImageView.ScaleType.FIT_XY);        imageView.setOnTouchListener(new View.OnTouchListener() {            @Override            public boolean onTouch(View view, MotionEvent event) {              boolean isTiaoZhuan=true;                switch (event.getAction()){                    case MotionEvent.ACTION_DOWN:                        handler.removeCallbacksAndMessages(null);                        break;                    case MotionEvent.ACTION_MOVE:                        isTiaoZhuan=false;                        handler.removeCallbacksAndMessages(null);                        break;                    case MotionEvent.ACTION_CANCEL:                        isTiaoZhuan=false;                        handler.sendEmptyMessageDelayed(0,3000);                        break;                    case MotionEvent.ACTION_UP:                        handler.sendEmptyMessageDelayed(0,3000);                        if (isTiaoZhuan){                            Toast.makeText(context,"跳转页面",Toast.LENGTH_SHORT).show();                           /* Intent intent=new Intent();                            context.startActivity(this,SecondActivity.class);*/                        }                        handler.sendEmptyMessageDelayed(0,3000);                        break;                }                return true;            }        });        container.addView(imageView);        return imageView;    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        container.removeView((View) object);    }}