Banner輪播圖！
阿新 • • 發佈：2018-12-01
1.佈局
依賴
implementation 'com.youth.banner:banner:1.4.10'
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout 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=".MainActivity"> <com.youth.banner.Banner android:id="@+id/banner1" android:layout_width="match_parent" android:layout_height="200dp"></com.youth.banner.Banner> </android.support.constraint.ConstraintLayout>
2.主頁面
package com.bw.ymy.lunbo; import android.content.Context; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.ImageView; import com.nostra13.universalimageloader.core.ImageLoader; import com.youth.banner.Banner; import com.youth.banner.BannerConfig; import com.youth.banner.loader.ImageLoaderInterface; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private Banner banner1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //獲取資源id banner1=findViewById(R.id.banner1); //設定文字 banner1.setBannerStyle(BannerConfig.CIRCLE_INDICATOR_TITLE_INSIDE); banner1.setImageLoader(new ImageLoaderInterface<ImageView>() { @Override public void displayImage(Context context, Object path, ImageView imageView) { Bean.NewslistBean bean= (Bean.NewslistBean) path; ImageLoader.getInstance().displayImage(bean.getPicUrl(),imageView); } @Override public ImageView createImageView(Context context) { ImageView imageView=new ImageView(context); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); return imageView; } }); indata(); } private void indata() { Netiul.getInstance().getRequest("https://api.tianapi.com/wxnew/?key=c4aa776e0a51d57d6750511e2baa46b6&num=6&page=1", Bean.class,new Netiul.Callback<Bean>() { @Override public void onsuccess(Bean bean) { banner1.setImages(bean.getNewslist()); banner1.setBannerTitles(getTitles(bean)); banner1.start(); } }); } private List<String> getTitles(Bean bannerResponse) { List<String> list = new ArrayList<>(); for (Bean.NewslistBean banner: bannerResponse.getNewslist()) { list.add(banner.getTitle()); } return list; } }
3.工具類
package com.bw.ymy.lunbo; import android.os.AsyncTask; import android.provider.CallLog; 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.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; public class Netiul { public static Netiul instance; public Netiul() { } public static Netiul getInstance() { if(instance==null) { instance=new Netiul(); } return instance; } public interface Callback<T>{ void onsuccess(T t); } public void getRequest(final String urlstr, final Class clazz,final Callback callback) { new AsyncTask<String,Void,Object>() { @Override protected Object doInBackground(String... strings) { return getRequest(strings[0],clazz); } @Override protected void onPostExecute(Object o) { callback.onsuccess(o); } }.execute(urlstr); } public <T> T getRequest(String urlStr,Class clazz) { return (T) new Gson().fromJson(getRequest(urlStr),clazz); } public String getRequest(String urlStr){ String result = ""; try { //定義url地址 URL url = new URL(urlStr); //開啟連線 HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); //設定請求格式 urlConnection.setRequestMethod("GET"); //設定超時 urlConnection.setReadTimeout(5000); urlConnection.setConnectTimeout(5000); //獲取請求碼 int responseCode = urlConnection.getResponseCode(); if(responseCode == 200){ result = stream2String(urlConnection.getInputStream()); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return result; } //將位元組流轉換為字元流 private String stream2String(InputStream inputStream) throws IOException { StringBuilder builder = new StringBuilder(); BufferedReader br = new BufferedReader(new InputStreamReader(inputStream)); for (String tmp = br.readLine();tmp!=null;tmp = br.readLine()){ builder.append(tmp); } return builder.toString(); } }
4.App
package com.bw.ymy.lunbo;
import android.app.Application;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
ImageLoader.getInstance().init(
new ImageLoaderConfiguration.Builder(this)
.memoryCacheSizePercentage(10)
.discCacheSize(50 * 1024 * 1024)
.defaultDisplayImageOptions(
new DisplayImageOptions.Builder()
.showImageOnFail(R.mipmap.ic_launcher)
.showImageOnLoading(R.mipmap.ic_launcher)
.cacheInMemory(true)
.cacheOnDisk(true)
.build()
)
.build()
);
}
}
5.Bean類
package com.bw.ymy.lunbo;
import java.util.List;
public class Bean {
/**
* code : 200
* msg : success
* newslist : [{"ctime":"2018-11-18","title":"普通人的汽車基礎知識到底有多差？","description":"易車","picUrl":"http://mmbiz.qpic.cn/mmbiz_jpg/tXmTSicVPQ6enLlOibt3RlJsElhn3s1HU26m15CuHDMvWKU0g4xCEadHksFVdzkdibHVRUQlibBsttpMicE64ib8LCTw/0?wx_fmt=jpeg","url":"https://mp.weixin.qq.com/s?src=11×tamp=1542540609&ver=1252&signature=eMbdrP2jsY3rO29rXPW0Mz3YTbYZIwL8JT9LjdhLdvUaZ3CSWe*NqMvBtI3P9jItt6urlZ*HbhICMVsBzZcZzBaNDj7ovAaBcoDv7bvk*BuVfBfQElBent5ZfHSnUiJk&new=1"},{"ctime":"2018-11-18","title":"韋德可能沒法大帽詹姆斯了。詹姆斯輸球了還要被為難。","description":"詹姆斯說","picUrl":"http://mmbiz.qpic.cn/mmbiz_jpg/geLkPvpOhUSO2UZDgmdp9iaHwC8syFWAPnS6wf5Xq8HRY3TVjbhMZQJTdYyLiaBLNB8kg1Q99ZMLicokH702Yclyg/0?wx_fmt=jpeg","url":"https://mp.weixin.qq.com/s?src=11×tamp=1542540620&ver=1252&signature=*Jkik6mGD1Zjx20taBuMMyI01LxdBjrST1Hl9qhvOWpbDZCpUbM*a4SxO4cFUWEgZp*TY6ASE2jRvdjWqCP7WiowIDj0LPxLZxF4A6rErNu4YIbRkoaIufCbUHs*D8GJ&new=1"},{"ctime":"2018-11-18","title":"賽季首個60分誕生！喬老闆還捨得交易他嗎？","description":"騰訊NBA","picUrl":"http://mmbiz.qpic.cn/mmbiz_jpg/OQeAz51Lq7JibYuSOIN7rzSr9BqczGSCSnx4oUoEZgGPTlgNOBuIJyObDOiaTwaAKebqzlRtfXJ9uyM6E7er85Cw/0?wx_fmt=jpeg","url":"https://mp.weixin.qq.com/s?src=11×tamp=1542540620&ver=1252&signature=Ww97b063b9rf0C2OQhdWhCCr74SFNozO6bNuXNeWWl1is6XAzr6KnhtaKBHWDua50*jAbV51OY9MneKP9sAS2Z*tctHx4tGPbposKhE6SMP0vWe5XvzUH5zAat0a5coQ&new=1"},{"ctime":"2018-11-18","title":"中國移動：5G時代每月人均流量至少60GB","description":"電腦報","picUrl":"http://mmbiz.qpic.cn/mmbiz_jpg/HrhrgxCloNaicMKjagZsNzVnsVCkAhwFSPyJQu8l5w71cfgwfKaHArMWCna3zYAdLAnRd6NBKbg2icdfmSWyZiaWQ/0?wx_fmt=jpeg","url":"https://mp.weixin.qq.com/s?src=11×tamp=1542540606&ver=1252&signature=HGPVWHZAaOPdxUZbFx4o79dHIwvT4DniBaLk1Li-b0pkbywkWwZqurbDiFEerjX*wz1T8nbiTRvYhAIyyNIij8UU2i6gtZA2M0Wb9GihMIcwpu4BG6od-Ccjlld1OXiP&new=1"},{"ctime":"2018-11-18","title":"周小川國內首談數字貨幣和電子支付：有三方面扭曲 有些技術只關注如何圈錢","description":"大公網","picUrl":"http://mmbiz.qpic.cn/mmbiz_jpg/1rNDCX3Xn4E6s6jCJFjYibdIrQ6ESE8leib5ZVsSSyqViaOZ4ImaGPnrCVKH49libAibx6LsyXWGcsZ205jxNjqckEA/0?wx_fmt=jpeg","url":"https://mp.weixin.qq.com/s?src=11×tamp=1542540608&ver=1252&signature=oS4sTMvXomHQzgHGXjNZGyT6ljjuYwuyhaBkrr5deynbaymihpsyi1AGREauBNbNvHH76cbYdxvXr7zbfz2y3NxNphFXx5cDUIjj7m2VwT82wIVe4EdE9oP6F45wLulJ&new=1"},{"ctime":"2018-11-18","title":"湖北：半歲嬰兒\u201c灌腸\u201d退燒 退燒不成反腎衰 面臨終身透析","description":"醫群網","picUrl":"http://mmbiz.qpic.cn/mmbiz_jpg/AuyMO4zftIqRF8NicTCuTicYFpbD72XyEq8UA2IGgxYDocezyoQwxfDMor8YopxeAtsoXbcILVWh6UhoZGDAZuNQ/0?wx_fmt=jpeg","url":"https://mp.weixin.qq.com/s?src=11×tamp=1542540603&ver=1252&signature=ETBgeBQQNDkh6GalturYW4UDspDW2xTh8imKCtSPk46bUs2vzDZfzFdhdNyOknc-RvtCTQa8VQ*kE8Yj0v23WVeWE26Yf-G53F*GYgoY3321H7jqg3lPpL1IVTLzArYb&new=1"}]
*/
private int code;
private String msg;
private List<NewslistBean> newslist;
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public List<NewslistBean> getNewslist() {
return newslist;
}
public void setNewslist(List<NewslistBean> newslist) {
this.newslist = newslist;
}
public static class NewslistBean {
/**
* ctime : 2018-11-18
* title : 普通人的汽車基礎知識到底有多差？
* description : 易車
* picUrl : http://mmbiz.qpic.cn/mmbiz_jpg/tXmTSicVPQ6enLlOibt3RlJsElhn3s1HU26m15CuHDMvWKU0g4xCEadHksFVdzkdibHVRUQlibBsttpMicE64ib8LCTw/0?wx_fmt=jpeg
* url : https://mp.weixin.qq.com/s?src=11×tamp=1542540609&ver=1252&signature=eMbdrP2jsY3rO29rXPW0Mz3YTbYZIwL8JT9LjdhLdvUaZ3CSWe*NqMvBtI3P9jItt6urlZ*HbhICMVsBzZcZzBaNDj7ovAaBcoDv7bvk*BuVfBfQElBent5ZfHSnUiJk&new=1
*/
private String ctime;
private String title;
private String description;
private String picUrl;
private String url;
public String getCtime() {
return ctime;
}
public void setCtime(String ctime) {
this.ctime = ctime;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getPicUrl() {
return picUrl;
}
public void setPicUrl(String picUrl) {
this.picUrl = picUrl;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
}
補充 ：無關緊要
package com.bw.ymy.zonghe2.Nutil;
import android.app.Application;
import android.graphics.Bitmap;
import com.bw.ymy.zonghe2.R;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
ImageLoader.getInstance().init(new ImageLoaderConfiguration.Builder(this)
.diskCacheSize(50*1024*1024)
.memoryCacheSizePercentage(10)
.defaultDisplayImageOptions(new DisplayImageOptions.Builder()
.bitmapConfig(Bitmap.Config.RGB_565)
.cacheInMemory(true)
.cacheOnDisk(true)
.showImageOnFail(R.mipmap.ic_launcher)
.showImageForEmptyUri(R.mipmap.ic_launcher)
.showImageOnLoading(R.mipmap.ic_launcher)
.build())
.build());
}
}