资讯_Banner无限轮播

依赖

implementation 'com.youth.banner:banner:1.4.9'
implementation 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'

权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <com.youth.banner.Banner
        android:id="@+id/banner"
        android:layout_width="match_parent"
        android:layout_height="200dp"></com.youth.banner.Banner>

</LinearLayout>

MainAcitivity

package com.example.luwenjie0116;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.widget.ImageView;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.youth.banner.Banner;
import com.youth.banner.loader.ImageLoader;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //控件
        Banner banner = findViewById(R.id.banner);
        //数据
        List<String> 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");
        //设置配置
        banner.setImageLoader(new ImageLoader() {
            @Override
            public void displayImage(Context context, Object path, ImageView imageView) {
                //加载照片
                DisplayImageOptions options = new DisplayImageOptions.Builder()
                        .cacheInMemory(true)//让图片进行内存缓存
                        .cacheOnDisk(true)//让图片进行sdcard缓存
                        .build();
                //参数1：加载的图片地址
                //参数2：将图片设置到那个图片控件上面
                //参数3：加载图片配置选项，意思是指明对这张图片的是否进行缓存(内存、sdcard)
                com.nostra13.universalimageloader.core.ImageLoader.getInstance().displayImage((String) path, imageView, options);
            }
        });
        banner.setImages(list);//图片数据
        banner.isAutoPlay(true);//是否轮播 true是
        banner.setDelayTime(3000);//图片切换时间
        banner.start();//开始轮播



    }
}

在写app页面时，一定要在清单文件里注册

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.luwenjie0116">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:name=".App"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

App

package com.example.luwenjie0116;

import android.app.Application;
import android.os.Environment;

import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiskCache;
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

import java.io.File;

/**
 * @Auther: 努力
 * @Date: 2019/1/16 14:45:${卢文杰}
 * @Description:
 */
public class App extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        String path = Environment.getExternalStorageDirectory().getPath() + "/Image";
        File file = new File(path);

        ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this)
                .memoryCacheExtraOptions(200, 200)//配置内存缓存图片的尺寸
                .memoryCacheSize(2 * 1024 * 1024)//配置内存缓存的大小
                .threadPoolSize(3)//配置加载图片的线程数
                .threadPriority(1000)//配置线程的优先级
                .diskCache(new UnlimitedDiskCache(file))//UnlimitedDiskCache 限制这个图片的缓存路径
                .diskCacheFileCount(50)//配置sdcard缓存文件的数量
                .diskCacheFileNameGenerator(new Md5FileNameGenerator())//MD5这种方式生成缓存文件的名字
                .diskCacheSize(50 * 1024 * 1024)//在sdcard缓存50MB
                .build();//完成

        ImageLoader.getInstance().init(config);
    }
}

效果图