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   源码介绍

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package com.peter.practice;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

public class TestActivity extends Activity {
	ListView myListView;
	// ArrayList list ;
	ArrayList<User> list;
	ProgressBar progressBar;
	AllViewHolder holder;
	User user;
	MyListViewAdapter adapter;
	private String josnData = "[{\"name\":\"Michael\",\"age\":20},{\"name\":\"jim\",\"age\":28},{\"name\":\"Michael\",\"age\":20},"
			  "{\"name\":\"jim\",\"age\":28},{\"name\":\"Michael\",\"age\":20},{\"name\":\"jim\",\"age\":28},{\"name\":\"Michael\",\"age\":20},{\"name\":\"jim\",\"age\":28},"
			  "{\"name\":\"Michael\",\"age\":20},{\"name\":\"jim\",\"age\":28},{\"name\":\"Michael\",\"age\":20},{\"name\":\"jim\","
			  "\"age\":28},{\"name\":\"Michael\",\"age\":20},{\"name\":\"jim\",\"age\":28},{\"name\":\"Michael\",\"age\":20},"
			  "{\"name\":\"jim\",\"age\":28},{\"name\":\"Michael\",\"age\":20},{\"name\":\"jim\",\"age\":28}]";

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		progressBar = (ProgressBar)findViewById(R.id.progess);
		// initData();
		refresh();
	}
	public void refresh(){
		try {
			Thread.sleep(5*1000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		progressBar.setVisibility(View.GONE);
		praseFromJosn(josnData);
		myListView = (ListView) findViewById(R.id.myListView);

		adapter = new MyListViewAdapter(TestActivity.this);
		myListView.setAdapter(adapter);
		//给ListView注册一个上下文菜单
		registerForContextMenu(myListView);
		
	}
	//初始化上下文菜单
	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {

		super.onCreateContextMenu(menu, v, menuInfo);
		AdapterContextMenuInfo adapterContextMenuInfo = (AdapterContextMenuInfo) menuInfo;
		menu.setHeaderTitle("弹出上下文菜单");
		menu.add(1, 1, 1, adapterContextMenuInfo.id   "转发");
		menu.add(1, 2, 2, adapterContextMenuInfo.id   "评论");
		menu.add(1, 3, 3, adapterContextMenuInfo.id   "收藏");
		menu.add(1, 4, 4, adapterContextMenuInfo.id   "查看信息");
	
	}
	//当用户触发了上下文  菜单的某一项
	@Override
	public boolean onContextItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		// 得到菜单项信息
		AdapterContextMenuInfo adapterContextMenuInfo = (AdapterContextMenuInfo) item
				.getMenuInfo();
		Toast.makeText(this, ""   adapterContextMenuInfo.id, 1000).show();
		switch (item.getItemId()) {
		case 1://转发
			Intent intent = new Intent(this,TransmitActivity.class);
			intent.getExtras().putLong("statusId", adapterContextMenuInfo.id);
			break;

		case 2://评论
			break;
			
		case 3://收藏
			break;
			
		case 4://查看信息
			break;
		}
		return super.onContextItemSelected(item);
	}

	/*
	 * public void initData(){ list = new ArrayList<User>(); user = new User();
	 * user.setName("张三"); user.setAge(20); list.add(user);
	 * 
	 * user = new User(); user.setName("李四"); user.setAge(21); list.add(user);
	 * 
	 * }
	 */
	class AllViewHolder {
		TextView myTextView;
		TextView myAge;
	}

	class MyListViewAdapter extends BaseAdapter {
		private Context context;
		LayoutInflater myInflater;

		public MyListViewAdapter(Context context) {
			this.context = context;
			myInflater = LayoutInflater.from(context);
		}

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return list.size();
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return list.get(position);
		}

		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			user = list.get(position);
			if (convertView == null) {
				convertView = myInflater.inflate(R.layout.main_item, null);
				holder = new AllViewHolder();

				holder.myTextView = (TextView) convertView
						.findViewById(R.id.myTextView);
				holder.myAge = (TextView) convertView.findViewById(R.id.myAge);

				// holder.myAge.setText("" user.getAge());
				convertView.setTag(holder);

			} else {

				holder = (AllViewHolder) convertView.getTag();
			}
			holder.myTextView.setText(user.getName());
			holder.myAge.setText(""   user.getAge());
			return convertView;
		}

	}

	public List praseFromJosn(String jsonData) {
		Type ListType = new TypeToken<ArrayList<User>>() {
		}.getType();
		Gson gson = new Gson();
		list = gson.fromJson(jsonData, ListType);

		return list;

	}
}