AsyncTask网络解析-----缓存数据

package com.baway.renjue.activity; import android.os.AsyncTask; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.ListView; import android.widget.TextView; import com.baway.renjue.R; import com.baway.renjue.adapter.HouseAdapter; import com.baway.renjue.bean.HouseBean; import com.baway.renjue.utils.StreamUtils; import com.google.gson.Gson; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.text.Collator; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; import cz.msebera.android.httpclient.HttpResponse; import cz.msebera.android.httpclient.client.HttpClient; import cz.msebera.android.httpclient.client.methods.HttpGet; import cz.msebera.android.httpclient.impl.client.DefaultHttpClient; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private ListView listView; private TextView tv_uptolow; private TextView tv_lowtoup; private String jsonUrl="http://api.fang.anjuke.com/m/android/1.3/shouye/recInfosV3/?city_id=14&lat=40.04652&lng=116.306033&api_key=androidkey&sig=9317e9634b5fbc16078ab07abb6661c5&macid=45cd2478331b184ff0e15f29aaa89e3e&app=a-ajk&_pid=11738&o=PE-TL10-user+4.4.2+HuaweiPE-TL10+CHNC00B260+ota-rel-keys,release-keys&from=mobile&m=Android-PE-TL10&cv=9.5.1&cid=14&i=864601026706713&v=4.4.2&pm=b61&uuid=1848c59c-185d-48d9-b0e9-782016041109&_chat_id=0&qtime=20160411091603"; private List<HouseBean.Result.Rows> rows; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //找控件 initView(); //查找文件是否存在 String path = Environment.getExternalStorageDirectory() + "/cachehouse.json"; File file=new File(path); if (!file.exists()){ //不存在则获取网络数据 getServerData(); }else{ //存在则直接解析 try { InputStream read=new FileInputStream(file); String json = StreamUtils.streamToString(read); parseJson(json); } catch (FileNotFoundException e) { e.printStackTrace(); } } } private void getServerData() { MyAsyncTask task=new MyAsyncTask(); task.execute(jsonUrl); } private void initView() { listView = (ListView) findViewById(R.id.listView); tv_lowtoup = (TextView) findViewById(R.id.tv_lowtoup); tv_uptolow = (TextView) findViewById(R.id.tv_uptolow); } /** * 异步任务类 */ public class MyAsyncTask extends AsyncTask<String,Integer,String>{ @Override protected void onPreExecute() { super.onPreExecute(); } //网络请求耗时操作 @Override protected String doInBackground(String... params) { String url=params[0]; HttpClient client=new DefaultHttpClient(); HttpGet request=new HttpGet(url); try { HttpResponse response = client.execute(request); if (response.getStatusLine().getStatusCode()==200){ InputStream inputStream = response.getEntity().getContent(); String result = StreamUtils.streamToString(inputStream); return result; } } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onProgressUpdate(Integer... values) { super.onProgressUpdate(values); } //更新UI @Override protected void onPostExecute(String s) { super.onPostExecute(s); String json=s.toString(); //将网络请求到的json存入指定文件 PrintWriter pw= null; try { File file=new File(Environment.getExternalStorageDirectory()+"/cache/"); if (!file.exists()){ file.mkdirs(); } pw = new PrintWriter(file.getPath()+"house.json"); } catch (FileNotFoundException e) { e.printStackTrace(); } pw.write(json); pw.close(); //解析json parseJson(json); } } private void parseJson(String json) { Gson gson=new Gson(); HouseBean houseBean = gson.fromJson(json, HouseBean.class); rows = houseBean.result.rows; listView.setAdapter(new HouseAdapter(MainActivity.this, rows)); //textView监听 tv_lowtoup.setOnClickListener(this); tv_uptolow.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()){ //从小到大排序 case R.id.tv_lowtoup: List<HouseBean.Result.Rows> list1=new ArrayList<>(); List<HouseBean.Result.Rows> list2=new ArrayList<>(); List<HouseBean.Result.Rows> list3=new ArrayList<>(); for (int i = 0; i < rows.size(); i++) { if (rows.get(i).info.new_price_back.equals("万元/套起")){ list1.add(rows.get(i)); }else{ list2.add(rows.get(i)); } } //排序 Collections.sort(list2, new Comparator<HouseBean.Result.Rows>() { @Override public int compare(HouseBean.Result.Rows o1, HouseBean.Result.Rows o2) { HouseBean.Result.Rows o11 = o1; HouseBean.Result.Rows o21 = o2; return new Double(o1.info.new_price_value).compareTo(new Double(o2.info.new_price_value)); } }); list3.addAll(list2); list3.addAll(list1); listView.setAdapter(new HouseAdapter(MainActivity.this, list3)); break; case R.id.tv_uptolow: List<HouseBean.Result.Rows> list4=new ArrayList<>(); List<HouseBean.Result.Rows> list5=new ArrayList<>(); List<HouseBean.Result.Rows> list6=new ArrayList<>(); for (int i = 0; i < rows.size(); i++) { if (rows.get(i).info.new_price_back.equals("万元/套起")){ list4.add(rows.get(i)); }else{ list5.add(rows.get(i)); } } //排序 Collections.sort(list5, new Comparator<HouseBean.Result.Rows>() { @Override public int compare(HouseBean.Result.Rows o1, HouseBean.Result.Rows o2) { HouseBean.Result.Rows o11 = o1; HouseBean.Result.Rows o21 = o2; return new Double(o2.info.new_price_value).compareTo(new Double(o1.info.new_price_value)); } }); list6.addAll(list4); list6.addAll(list5); listView.setAdapter(new HouseAdapter(MainActivity.this, list6)); break; } }

}

package com.baway.renjue.adapter; import android.content.Context; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; import com.baway.renjue.R; import com.baway.renjue.bean.HouseBean; import com.baway.renjue.utils.ImageLoaderOptionsUtils; import com.nostra13.universalimageloader.core.ImageLoader; import java.util.List; public class HouseAdapter extends BaseAdapter{ private Context context; private List<HouseBean.Result.Rows> rows; public HouseAdapter(Context context, List<HouseBean.Result.Rows> rows) { this.context = context; this.rows = rows; } @Override public int getCount() { return rows.size(); } @Override public Object getItem(int position) { return rows.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder v; if (convertView==null){ convertView=View.inflate(context, R.layout.lv_item,null); v=new ViewHolder(); v.iv_default= (ImageView) convertView.findViewById(R.id.iv_default); v.tv_name= (TextView) convertView.findViewById(R.id.tv_name); v.tv_region= (TextView) convertView.findViewById(R.id.tv_region); v.tv_price= (TextView) convertView.findViewById(R.id.tv_price); v.tv_tag1= (TextView) convertView.findViewById(R.id.tv_tag1); v.tv_tag2= (TextView) convertView.findViewById(R.id.tv_tag2); v.tv_tag3= (TextView) convertView.findViewById(R.id.tv_tag3); v.tv_sale= (TextView) convertView.findViewById(R.id.tv_sale); convertView.setTag(v); }else{ v= (ViewHolder) convertView.getTag(); } ImageLoader.getInstance().displayImage(rows.get(position).info.default_image,v.iv_default, ImageLoaderOptionsUtils.imageLoaderOptions(R.mipmap.ic_launcher)); v.tv_name.setText(rows.get(position).info.loupan_name); v.tv_region.setText(rows.get(position).info.region_title+"-"+rows.get(position).info.sub_region_title); v.tv_price.setText(rows.get(position).info.new_price_value+rows.get(position).info.new_price_back); String tags = rows.get(position).info.tags; String[] split = tags.split(","); if (split.length>=3){ v.tv_tag1.setText(split[0]); v.tv_tag2.setText(split[1]); v.tv_tag3.setText(split[2]); }else{ v.tv_tag1.setText(split[0]); } v.tv_sale.setText(rows.get(position).info.sale_title); return convertView; } class ViewHolder{ ImageView iv_default; TextView tv_name,tv_region,tv_price,tv_tag1,tv_tag2,tv_tag3,tv_sale; } }

package com.baway.renjue.bean; import java.util.List; public class HouseBean { public Result result; @Override public String toString() { return "HouseBean{" + "result=" + result + '}'; } public class Result{ public List<Rows> rows; @Override public String toString() { return "Result{" + "rows=" + rows + '}'; } public class Rows{ public Info info; @Override public String toString() { return "Rows{" + "info=" + info + '}'; } public class Info{ public String default_image; public String loupan_name; public String new_price_back; public String new_price_value; public String region_title; public String sale_title; public String sub_region_title; public String tags; @Override public String toString() { return "Info{" + "default_image='" + default_image + '\'' + ", loupan_name='" + loupan_name + '\'' + ", new_price_back='" + new_price_back + '\'' + ", new_price_value='" + new_price_value + '\'' + ", region_title='" + region_title + '\'' + ", sale_title='" + sale_title + '\'' + ", sub_region_title='" + sub_region_title + '\'' + ", tags='" + tags + '\'' + '}'; } } } } }