求助,一运行程序就崩溃。。底下是源代码,大家帮帮忙。。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | package com.tired.itemlist; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import java.net.MalformedURLException; import java.util.ArrayList; import java.util.List; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.widget.ListView; public class MainActivity extends Activity { private ListView mlistView; private static String URL = "http://www.imooc.com/api/teacher?type=4&num=30" ; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); mlistView = (ListView) findViewById(R.id.lv_main); new NewsAsyncTask().execute(URL); } private List<NewsBean> getJsonData(String url) { List<NewsBean> newsBeanList = new ArrayList<NewsBean>(); try { String jsonString = readStream( new java.net.URL(url).openStream()); JSONObject jsonObject; NewsBean newsBean; try { jsonObject = new JSONObject(jsonString); JSONArray jsonArray =jsonObject.getJSONArray( "data" ); for ( int i = 0 ; i < jsonArray.length(); i++) { jsonObject = jsonArray.getJSONObject(i); newsBean = new NewsBean(); newsBean.newsIconUrl=jsonObject.getString( "picSmall" ); newsBean.newsTitle=jsonObject.getString( "name" ); newsBean.newsContent=jsonObject.getString( "description" ); newsBeanList.add(newsBean); } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return newsBeanList; } private String readStream(InputStream is) { InputStreamReader isr; String result2 = "" ; try { String line = "" ; isr = new InputStreamReader(is, "utf-8" ); BufferedReader br = new BufferedReader(isr); try { while ((line = br.readLine()) != null ) { result2 += line; Log.d( "main" , result2); } } catch (IOException e) { e.printStackTrace(); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return result2; } class NewsAsyncTask extends AsyncTask<String, Void, List<NewsBean>> { @Override protected List<NewsBean> doInBackground(String... arg0) { return getJsonData(arg0[ 0 ]); } @Override protected void onPostExecute(List<NewsBean> result) { super .onPostExecute(result); NewsAdapter adapter = new NewsAdapter(MainActivity. this , result); mlistView.setAdapter(adapter); } } } package com.tired.itemlist; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class NewsAdapter extends BaseAdapter { private List<NewsBean> mList; private LayoutInflater mInflater; public NewsAdapter(Context context,List<NewsBean> data){ mInflater = LayoutInflater.from(context); mList =data; } @Override public int getCount() { // TODO Auto-generated method stub return mList.size(); } @Override public Object getItem( int arg0) { // TODO Auto-generated method stub return mList.get(arg0); } @Override public long getItemId( int arg0) { // TODO Auto-generated method stub return arg0; } @Override public View getView( int arg0, View arg1, ViewGroup arg2) { // TODO Auto-generated method stub ViewHolder viewHolder; if (arg1 == null ){ viewHolder = new ViewHolder(); arg1 =mInflater.inflate(R.layout.item_layout, null ); viewHolder.ivIcon =(ImageView) arg1.findViewById(R.id.icon); viewHolder.tvTitle =(TextView) arg1.findViewById(R.id.tv_title); viewHolder.tvContent = (TextView) arg1.findViewById(R.id.tv_content); arg1.setTag(viewHolder); } else { viewHolder =(ViewHolder) arg1.getTag(); } viewHolder.ivIcon.setImageResource(R.drawable.ic_launcher); viewHolder.tvTitle.setText(mList.get(arg0).newsTitle); viewHolder.tvContent.setText(mList.get(arg0).newsContent); return arg1; } class ViewHolder{ public TextView tvTitle,tvContent; public ImageView ivIcon; } } package com.tired.itemlist; public class NewsBean { public String newsIconUrl; public String newsTitle; public String newsContent; } |