图片无线轮播

来源：互联网发布：校园异术超能小说知乎编辑：程序博客网时间：2024/05/06 20:27

package com.bwie.wuxianlunbo;

加权限 和app包 还有加载图片的文件import android.os.Handler;import android.os.Message;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageView;import android.widget.LinearLayout;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private ViewPager vp;    private LinearLayout lin_bottom;    private List<String> list;    private List<ImageView> images;    private Handler handler=new Handler(){        @Override        public void handleMessage(Message msg) {            int index = vp.getCurrentItem();            vp.setCurrentItem(index+1);            setSelectedPoint((index+1)%list.size());            sendEmptyMessageDelayed(1,2000);        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        vp = (ViewPager) findViewById(R.id.vp);        lin_bottom = (LinearLayout) findViewById(R.id.lin_bottom);        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");        //设置适配器        vp.setAdapter(new ImageAdapter(this,list));        //设置小圆点        initDoc();        //设置当前要显示的页面        vp.setCurrentItem(list.size()*10);        //发送一条消息自动播放        handler.sendEmptyMessageDelayed(1,2000);    }    //根据小圆点的下标设置选中的颜色    public void setSelectedPoint(int index){        for (int i=0;i<images.size();i++){            if(i==index){                images.get(i).setImageResource(R.drawable.point_selected);            }else{                images.get(i).setImageResource(R.drawable.point_un_selected);            }        }    }    //初始化小圆点    private void initDoc(){        images = new ArrayList<>();        for(int i=0;i<list.size();i++){            ImageView imagepoint=new ImageView(this);            //设置图片的缩放模式            imagepoint.setScaleType(ImageView.ScaleType.FIT_XY);            //设置要显示的图片            if(i==0){                imagepoint.setImageResource(R.drawable.point_selected);            }else {                imagepoint.setImageResource(R.drawable.point_un_selected);            }            //设置图片的宽度和高度            LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(20,20);            params.setMargins(10,0,10,0);            //添加到底部容器中            lin_bottom.addView(imagepoint,params);            //添加到集合中            images.add(imagepoint);        }    }}

适配器

package com.bwie.wuxianlunbo;import android.content.Context;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.utils.ImageSizeUtils;import java.util.List;/** * Created by 老北城 on 2017/10/18. */public class ImageAdapter extends PagerAdapter {    private Context context;    private List<String> list;    public ImageAdapter(Context context, List<String> list) {        this.context = context;        this.list = list;    }    @Override    public int getCount() {        //返回的页数是无限大        return Integer.MAX_VALUE;    }    @Override    public boolean isViewFromObject(View view, Object object) {        return view==object;    }    @Override    public Object instantiateItem(ViewGroup container, int position) {        //返回当前要显示的视图        ImageView imageView=new ImageView(context);        imageView.setScaleType(ImageView.ScaleType.FIT_XY);        //加载网络上面的图片        ImageLoader.getInstance().displayImage(list.get(position%list.size()),imageView, ImageloaderUtil.getImageOptions());        //添加到容器里面        container.addView(imageView);        return imageView;    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        //移除        container.removeView((View) object);    }}

布局

<?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="com.bwie.wuxianlunbo.MainActivity">    <android.support.v4.view.ViewPager        android:layout_width="match_parent"        android:layout_height="200dp"        android:id="@+id/vp"        ></android.support.v4.view.ViewPager>        <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:id="@+id/lin_bottom"        android:layout_alignBottom="@+id/vp"        android:gravity="center"        android:layout_marginBottom="7dp"        ></LinearLayout></RelativeLayout>

设置圆点在drawable里面

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval">    <solid android:color="#F53A08"></solid></shape>
<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval">    <solid android:color="#FFFFFF"></solid></shape>

阅读全文

0 0