Android——Banner无限轮播图

小咪咪 2022-06-06 09:36 211阅读 0赞

**示例图：**

**![Center][]**

**在build.gradle中添加依赖**

compile 'com.youth.banner:banner:1.4.9'

compile 'com.github.bumptech.glide:glide:3.7.0'

在项目清单中添加权限

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

在布局文件中添加Banner

<?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.bawei.com.myapplication.MainActivity">
        <com.youth.banner.Banner android:id="@+id/ban"
            android:layout_width="match_parent"
            android:layout_height="200dp"></com.youth.banner.Banner>
    
    </RelativeLayout>

MainActivity.java

package com.bawei.com.myapplication;
    
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    
    import com.youth.banner.Banner;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class MainActivity extends AppCompatActivity {
        private List<String> list = new ArrayList<String>();
        private Banner ban;
        String path = "http://120.27.23.105/ad/getAd";
        @Override protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            ban = (Banner) findViewById(R.id.ban);
            MyTask myTask = new MyTask(path,ban);
            myTask.execute();
        }
    }

MyTask.java

package com.bawei.com.myapplication;
    
    import android.os.AsyncTask;
    
    import com.google.gson.Gson;
    import com.youth.banner.Banner;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.UnsupportedEncodingException;
    import java.net.HttpURLConnection;
    import java.net.MalformedURLException;
    import java.net.URL;
    import java.util.ArrayList;
    import java.util.List;
    
    /** * Created by Wangrx on 2017/11/3. */ public class MyTask extends AsyncTask<String,Integer,String>{
        private String path;
        private Banner ban;
        public MyTask(String path, Banner ban) {
            this.path = path;
            this.ban = ban;
        }
    
        @Override protected String doInBackground(String... strings) {
            try {
                URL url = new URL(path);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");
                connection.setReadTimeout(5000);
                connection.setConnectTimeout(5000);
                int responseCode = connection.getResponseCode();
                if (responseCode == 200){
                    InputStream inputStream = connection.getInputStream();
                    String s = setToString(inputStream, "utf-8");
                    return s;
                }
    
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }
    
        @Override protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Gson gson = new Gson();
            JsonRootBean bean = gson.fromJson(s, JsonRootBean.class);
            List<Data> data = bean.getData();
            ArrayList<String> list = new ArrayList<>();
            for (Data array:data) {
    
                list.add(array.getIcon());
            }
    
            ban.setImageLoader(new ImgApp());//引用ImgApp,加载里面的东西 ban.setImages(list);
            ban.isAutoPlay(true);
            ban.setDelayTime(2000);
            ban.start();
    
        }
    
        public String setToString(InputStream inputStream, String charset){
            InputStreamReader inputStreamReader = null;
            try {
                inputStreamReader = new InputStreamReader(inputStream,charset);
                BufferedReader reader = new BufferedReader(inputStreamReader);
                String s;
                StringBuilder builder = new StringBuilder();
                while ((s=reader.readLine())!=null){
                    builder.append(s);
                }
                reader.close();
                return builder.toString();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
    
            return null;
        }
    }

ImgApp.java

package com.bawei.com.myapplication;
    
    import android.content.Context;
    import android.widget.ImageView;
    
    import com.bumptech.glide.Glide;
    import com.youth.banner.loader.ImageLoader;
    
    /** * Created by Wangrx on 2017/11/3. */ public class ImgApp extends ImageLoader {
        @Override public void displayImage(Context context, Object path, ImageView imageView) {
            Glide.with(context).load(path).into(imageView);
        }
    }

[Center]: /images/20220606/e942445298194322a3a7e2e36df96893.png