網路請求資料 banner圖片輪播和list請求資料
阿新 • • 發佈：2019-02-19
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; importjava.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(); intresponseCode = 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) //設定圖片在下載期間顯示的圖片 .showImageForEmptyUri(R.mipmap.ic_launcher)//設定圖片Uri為空或是錯誤的時候顯示的圖片 .showImageOnFail(R.mipmap.ic_launcher) //設定圖片載入/解碼過程中錯誤時候顯示的圖片 .cacheInMemory(true)//設定下載的圖片是否快取在記憶體中 .cacheOnDisk(true) .considerExifParams(true) //是否考慮JPEG影象EXIF引數（旋轉，翻轉） .imageScaleType(ImageScaleType.EXACTLY_STRETCHED)//設定圖片以如何的編碼方式顯示 .bitmapConfig(Bitmap.Config.RGB_565)//設定圖片的解碼型別// .displayer(new RoundedBitmapDisplayer(30))//是否設定為圓角，弧度為多少 // .displayer(new FadeInBitmapDisplayer(100))//是否圖片載入好後漸入的動畫時間 //.displayer(new CircleBitmapDisplayer())//顯示圓形圖片 .build(); //構建完成 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 { //繼承Application File cacheFile= new File(Environment.getExternalStorageDirectory()+"/"+"imgages"); @Override public void onCreate() { super.onCreate(); //初始化元件,鏈式開發思想,整個框架的引數初始化配置 ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this) .memoryCacheExtraOptions(480, 800) // default = device screen dimensions 記憶體快取檔案的最大長寬 .diskCacheExtraOptions(480, 800, null) // 本地快取的詳細資訊(快取的最大長寬)，最好不要設定這個 .tasksProcessingOrder(QueueProcessingType.FIFO) // default .denyCacheImageMultipleSizesInMemory() .memoryCache(new LruMemoryCache(2 * 1024 * 1024)) //可以通過自己的記憶體快取實現 .memoryCacheSize(2 * 1024 * 1024) // 記憶體快取的最大值 .memoryCacheSizePercentage(13) // default .diskCacheSize(50 * 1024 * 1024) // 50 Mb sd卡(本地)快取的最大值 .diskCacheFileCount(100) // 可以快取的檔案數量 .diskCache(new UnlimitedDiskCache(cacheFile))//自定義快取目錄 // .threadPoolSize(3)//設定執行緒數 // default為使用HASHCODE對UIL進行加密命名， 還可以用MD5(new Md5FileNameGenerator())加密 .diskCacheFileNameGenerator(new HashCodeFileNameGenerator()) .defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default .writeDebugLogs() // 列印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(){ @Override public 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; } } }; @Override protected 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() { @Override public 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{ @Override public 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> { @Override protected String doInBackground(String... strings) { return Utils.getNetString(strings[0]); } @Override protected 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; @Override public int getCount() { return list.size(); } @Override public Object getItem(int i) { return null; } @Override public long getItemId(int i) { return 0; } @Override public int getItemViewType(int position) { //根據圖片是否為空進行判斷 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; } @Override public int getViewTypeCount() { //getview裡有幾個佈局就寫幾 return 2; } @Override public 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; } }
//網路狀態 <uses-permission android:name="android.permission.INTERNET" /> //sd讀寫許可權 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
application裡配置 android:name=".MApp"
//配置依賴compile 'com.google.code.gson:gson:2.2.4'//Gson compile 'com.youth.banner:banner:1.4.9' //圖片輪播 compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'//圖片框架