网络请求数据 banner图片轮播和list请求数据

import android.graphics.Bitmap;
import com.ljn.myapplication.R;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;

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 Utils {
public static String getNetString(String str){
try {
URL url=new URL(str);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
int responseCode = urlConnection.getResponseCode();
if (responseCode==200){
InputStream is = urlConnection.getInputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(is));
StringBuilder sb=new StringBuilder();
String line=null;
while ((line=br.readLine())!=null){
sb.append(line);
}
return sb.toString();
}
} catch (MalformedURLException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}
return null;
}

public static DisplayImageOptions getDisplayImageOption() {
DisplayImageOptions options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.mipmap.ic_launcher) //设置图片在下载期间显示的图片
.showImageForEmptyUri(R.mipmap.ic_launcher)//设置图片Uri为空或是错误的时候显示的图片
.showImageOnFail(R.mipmap.ic_launcher)  //设置图片加载/解码过程中错误时候显示的图片
.cacheInMemory(true)//设置下载的图片是否缓存在内存中
.cacheOnDisk(true)
.considerExifParams(true)  //是否考虑JPEG图像EXIF参数（旋转，翻转）
.imageScaleType(ImageScaleType.EXACTLY_STRETCHED)//设置图片以如何的编码方式显示
.bitmapConfig(Bitmap.Config.RGB_565)//设置图片的解码类型//
.displayer(new RoundedBitmapDisplayer(30))//是否设置为圆角，弧度为多少
// .displayer(new FadeInBitmapDisplayer(100))//是否图片加载好后渐入的动画时间
//.displayer(new CircleBitmapDisplayer())//显示圆形图片
.build();
//构建完成
return options;
}
}

import android.app.Application;import android.os.Environment;import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiskCache;import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;import com.nostra13.universalimageloader.core.DisplayImageOptions;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;import com.nostra13.universalimageloader.core.assist.QueueProcessingType;import java.io.File;public class MApp extends Application {//继承ApplicationFile cacheFile= new File(Environment.getExternalStorageDirectory()+"/"+"imgages");@Overridepublic void onCreate() {super.onCreate();//初始化组件,链式开发思想,整个框架的参数初始化配置ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this).memoryCacheExtraOptions(480, 800) // default = device screen dimensions 内存缓存文件的最大长宽.diskCacheExtraOptions(480, 800, null)  // 本地缓存的详细信息(缓存的最大长宽)，最好不要设置这个.tasksProcessingOrder(QueueProcessingType.FIFO) // default.denyCacheImageMultipleSizesInMemory().memoryCache(new LruMemoryCache(2 * 1024 * 1024)) //可以通过自己的内存缓存实现.memoryCacheSize(2 * 1024 * 1024)  // 内存缓存的最大值.memoryCacheSizePercentage(13) // default.diskCacheSize(50 * 1024 * 1024) // 50 Mb sd卡(本地)缓存的最大值.diskCacheFileCount(100)  // 可以缓存的文件数量.diskCache(new UnlimitedDiskCache(cacheFile))//自定义缓存目录// .threadPoolSize(3)//设置线程数// default为使用HASHCODE对UIL进行加密命名， 还可以用MD5(new Md5FileNameGenerator())加密.diskCacheFileNameGenerator(new HashCodeFileNameGenerator()).defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default.writeDebugLogs() // 打印debug log.build();ImageLoader.getInstance().init(configuration);}}

import android.content.Context;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import com.google.gson.Gson;import com.ljn.myapplication.bean.NetBean;import com.ljn.myapplication.bean.NewsBean;import com.ljn.myapplication.bean.TextBean;import com.ljn.myapplication.utils.Utils;import com.nostra13.universalimageloader.core.ImageLoader;import com.youth.banner.Banner;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {private String NetString="http://api.expoon.com/AppNews/getNewsList/type/1/p/1";private String ImageNetString="http://www.93.gov.cn/93app/data.do?channelId=0&startNum=0";List<NewsBean.DataBean> list=new ArrayList<NewsBean.DataBean>();private ListView lv;private MAdapter mAdapter;private ImageLoader instance;private Banner banner;private Handler handler=new Handler(){@Overridepublic void handleMessage(Message msg) {int what = msg.what;switch (what){case 1:List<TextBean.DataBean> data = (List<TextBean.DataBean>) msg.obj;Log.e("TAG", data.toString() );List<String> images=new ArrayList<String>();List<String> titles=new ArrayList<String>();for (int i=0;i<data.size();i++){images.add(data.get(i).getPic_url());titles.add(data.get(i).getNews_title());}banner.setImageLoader(new BImageLoader());banner.setImages(images);banner.setBannerTitles(titles);banner.start();break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);instance = ImageLoader.getInstance();getNetData();initDsta();lv = findViewById(R.id.lv);banner = (Banner) findViewById(R.id.banner);mAdapter = new MAdapter();lv.setAdapter(mAdapter);}private void initDsta() {new Thread() {@Overridepublic void run() {String str = Utils.getNetString(NetString);Log.e("TAG", str.toString() );Gson gson=new Gson();TextBean json = gson.fromJson(str, TextBean.class);List<TextBean.DataBean> data = json.getData();Message msg=new Message();msg.obj=data;msg.what=1;handler.sendMessage(msg);}}.start();}public void getNetData() {new MAsyncTask().execute(ImageNetString);}class BImageLoader extends com.youth.banner.loader.ImageLoader{@Overridepublic void displayImage(Context context, Object obj, ImageView imageView) {com.nostra13.universalimageloader.core.ImageLoader imageLoaderInstance = com.nostra13.universalimageloader.core.ImageLoader.getInstance();imageLoaderInstance.displayImage((String) obj, imageView);}}private class MAsyncTask extends AsyncTask<String,Void,String> {@Overrideprotected String doInBackground(String... strings) {return Utils.getNetString(strings[0]);}@Overrideprotected void onPostExecute(String s) {super.onPostExecute(s);Gson gson=new Gson();NewsBean json = gson.fromJson(s, NewsBean.class);List<NewsBean.DataBean> data = json.getData();list.addAll(data);mAdapter.notifyDataSetChanged();}}private class MAdapter extends BaseAdapter {private TextView TITLE;private TextView SUBTITLE;private ImageView IMAGEURL;private TextView FROMNAME;private ViewHolder vh;private VHolder vholder;@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int i) {return null;}@Overridepublic long getItemId(int i) {return 0;}@Overridepublic int getItemViewType(int position) {//根据图片是否为空进行判断int flag=0;if (list.get(position).getIMAGEURL()==null&&list.get(position).getIMAGEURL()==""){flag=0;}else if (list.get(position).getIMAGEURL()!=null&&list.get(position).getIMAGEURL()!=""){flag=1;}return flag;}@Overridepublic int getViewTypeCount() {//getview里有几个布局就写几return 2;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {int type = getItemViewType(i);switch (type){case 0:if (view==null){vholder = new VHolder();view = View.inflate(MainActivity.this, R.layout.item, null);view.setTag(vholder);}else{vholder = (VHolder) view.getTag();}vholder.TITLE = view.findViewById(R.id.item_TITLE);vholder.SUBTITLE = view.findViewById(R.id.item_SUBTITLE);vholder.FROMNAME = view.findViewById(R.id.item_FROMNAME);vholder.TITLE.setText(list.get(i).getTITLE());vholder.SUBTITLE.setText(list.get(i).getSUBTITLE());vholder.FROMNAME.setText(list.get(i).getFROMNAME());break;case 1:if (view==null){vh = new ViewHolder();view = View.inflate(MainActivity.this, R.layout.item, null);view.setTag(vh);}else{vh = (ViewHolder) view.getTag();}vh.TITLE = view.findViewById(R.id.item_TITLE);vh.SUBTITLE = view.findViewById(R.id.item_SUBTITLE);vh.IMAGEURL = view.findViewById(R.id.item_IMAGEURL);vh.FROMNAME = view.findViewById(R.id.item_FROMNAME);vh.TITLE.setText(list.get(i).getTITLE());vh.SUBTITLE.setText(list.get(i).getSUBTITLE());vh.FROMNAME.setText(list.get(i).getFROMNAME());instance.displayImage(list.get(i).getIMAGEURL(),vh.IMAGEURL,Utils.getDisplayImageOption());break;}return view;}}class ViewHolder{TextView TITLE;TextView SUBTITLE;ImageView IMAGEURL;TextView FROMNAME;} class VHolder{TextView TITLE;TextView SUBTITLE;TextView FROMNAME;}}

//网络状态<uses-permission android:name="android.permission.INTERNET" />//sd读写权限<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

application里配置android:name=".MApp"

//配置依赖

compile 'com.google.code.gson:gson:2.2.4'//Gsoncompile 'com.youth.banner:banner:1.4.9' //图片轮播compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'//图片框架