android客户端与服务器信息交互 http +json,android通过HttpClient与服务器JSON交互

package com.tp.soft.app;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.TextView;

import com.google.gson.Gson;

import com.google.gson.reflect.TypeToken;

import com.tp.soft.entity.User;

import com.tp.soft.util.HttpUtil;public classMainActivity extends Activity {privateListView mListView;privateTextView mContentTxt;privateTextView mTimeTxt;private String serverPath = "http://122.226.178.54:8080/uploadApp/LoginServlet";private static final String ENCODING = "utf-8";private ListuserList;

@Overrideprotected voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

loadList();

mListView=(ListView) findViewById(R.id.list_id);

mListView.setAdapter(newBaseAdapter() {

@Overridepublic View getView(intposition, View convertView, ViewGroup parent) {if(null ==convertView){

convertView= LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, null);

}

TextView textView=(TextView) convertView.findViewById(R.id.contentTxt);

textView.setText(userList.get(position).getUsername());returnconvertView;

}

@Overridepublic long getItemId(intposition) {returnposition;

}

@Overridepublic Object getItem(intposition) {returnposition;

}

@Overridepublic intgetCount() {returnuserList.size();

}

});

}private ListloadList() {

Map params = new HashMap();

String data= HttpUtil.postRequest(serverPath, params, ENCODING);

userList= new Gson().fromJson(data, new TypeToken>() {}.getType());returnuserList;

}

@Overridepublicboolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main, menu);return true;

}

}