PullToRefreshListViewのアップロード、ドロップダウン・リフレッシュ・ネットワーク・データの簡単なListView表示ネットワーク・データの実現
30545 ワード
1、依存:
compile 'com.google.code.gson:gson:2.6.2'
compile 'com.github.userswlwork:pull-to-refresh:1.0.0'
2、 :
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
3、 :
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="com.example.myapplication.MainActivity">
<com.handmark.pulltorefresh.library.PullToRefreshListView android:id="@+id/lv" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="start" android:choiceMode="singleChoice" android:dividerHeight="1px" android:divider="#ff3660" android:background="#33000000" android:layout_alignParentTop="true" />
android.support.constraint.ConstraintLayout>4、item :
xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/iv"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv"/> LinearLayout>
5、 News( )
6、 :NetWordUtils
package com.example.myapplication; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.util.Log; 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; /** * 2017-09-27. */ public class NetWordUtils { private static String tag = "NetWordUtils"; /** * json * * @param urlString * @return */ public static String getNetjson(String urlString) { try { URL url = new URL(urlString); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setRequestMethod("GET");// get ; urlConnection.setConnectTimeout(8000);// InputStream inputStream = urlConnection.getInputStream();// ; // StringBuilder stringBuilder = new StringBuilder(); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); String temp = ""; while ((temp = bufferedReader.readLine()) != null) { stringBuilder.append(temp); temp = ""; } // String data = stringBuilder.toString(); Log.e(tag, "getData: " + data); return data; } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return ""; } /** * */ public static Bitmap getNetBitmap(String urlString) { try { // URL ; URL url = new URL(urlString); // url HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); // int responseCode = urlConnection.getResponseCode(); if(responseCode ==200){ // InputStream inputStream = urlConnection.getInputStream(); // bitmap( BitmapFactory) Bitmap bitmap = BitmapFactory.decodeStream(inputStream);//BitmapFactory , return bitmap; }else { Log.e(tag, " :: "+responseCode ); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } }
7、MainActivity :
package com.example.myapplication; import android.graphics.Bitmap; import android.os.AsyncTask; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; 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.handmark.pulltorefresh.library.PullToRefreshBase; import com.handmark.pulltorefresh.library.PullToRefreshListView; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity {
private PullToRefreshListView lv; String urlTotal = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1"; private MAdapter mAdapter; private List
list = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv= (PullToRefreshListView) findViewById(R.id.lv); mAdapter = new MAdapter(); lv.setAdapter(mAdapter); initData(); lv.setMode(PullToRefreshBase.Mode.BOTH); lv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener () { @Override public void onRefresh(PullToRefreshBase pullToRefreshBase) { Toast.makeText(MainActivity.this, " ", Toast.LENGTH_SHORT).show(); initData(); lv.postDelayed(new Runnable() { public void run() { // lv.onRefreshComplete(); // i = 0;
// new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=" + i);} },1000); } }); lv.setOnLastItemVisibleListener(new PullToRefreshBase.OnLastItemVisibleListener() { @Override public void onLastItemVisible() {
// i = i + 20;
// new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=" + i);
Toast.makeText(MainActivity.this, " ", Toast.LENGTH_SHORT).show(); } }); } private void initData() { new MJsonAsyncTask().execute(urlTotal); } class MJsonAsyncTask extends AsyncTask
{ public MJsonAsyncTask() { super(); } // ui @Override protected void onPostExecute(String s) { super.onPostExecute(s); News news = new Gson().fromJson(s, News.class); List temp = news.getData(); list.addAll(temp); mAdapter.notifyDataSetChanged(); } // ; @Override protected String doInBackground(String... strings) { // 0 , url; String netjson = NetWordUtils.getNetjson(strings[0]);// return netjson; } } class MAdapter extends BaseAdapter { @Override public int getCount() { return list.size(); } @Override public Object getItem(int i) { return list.get(i); } @Override public long getItemId(int i) { return i; } @Override public View getView(int i, View containerView, ViewGroup viewGroup) { View view = View.inflate(MainActivity.this, R.layout.item, null); TextView tv_name = (TextView) view.findViewById(R.id.tv); ImageView iv = (ImageView) view.findViewById(R.id.iv); tv_name.setText(list.get(i).getNews_title()); /** * getView , , * url asyncTask */ ImageLoader.getInstance().displayImage(list.get(i).getPic_url(),iv);
return view; } } }