这里不多说了，直接上项目效果图，这里界面难看了一些，不过功能是可以实现的，改改一点界面就很漂亮了。这里说的实战开发的模块，UI就省了。项目APP下载地址是：链接：http://pan.baidu.com/s/1hs36ZjQ 密码：80ji

如下：

开始是程序的入口 ，这里只分享部分代码，具体看源代码的链接请看最后面的下载地址

package com.nnddkj.communication;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener{
private ImageView img_learning,img_answer,img_message,img_Set;
private String name;
private TextView myid;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		init();
	}
	/**
	 * 程序初始化操作
	 * 
	 */
	private void init() {
		img_learning=(ImageView) findViewById(R.id.img_learning);//找到控件
		img_answer=(ImageView) findViewById(R.id.img_answer);
		img_message=(ImageView) findViewById(R.id.img_message);
		img_Set=(ImageView) findViewById(R.id.img_Set);
		myid=(TextView) findViewById(R.id.myid);
		img_learning.setOnClickListener(this);//监听
		img_answer.setOnClickListener(this);
		img_message.setOnClickListener(this);
		img_Set.setOnClickListener(this);
		
		SharedPreferences sp=getSharedPreferences("user_config", Context.MODE_PRIVATE);
		String id=sp.getString("name", null);
		myid.setText("欢迎你,"+id);
		
	}
	@Override
	public void onClick(View v) {
		int id =v.getId();
		switch (id) {
		case R.id.img_learning://学习平台
			Intent Materials=new Intent();
			Materials.setClass(MainActivity.this, LearningMaterials.class);//打开另一个界面
			startActivity(Materials);
			finish();//隐藏当前界面
			break;
		case R.id.img_answer://答疑
			Intent answer=new Intent();
			answer.setClass(MainActivity.this, Answer.class);//打开另一个界面
			startActivity(answer);
			finish();//隐藏当前界面
			break;
		case R.id.img_message://留言板
			Intent message=new Intent();
			message.setClass(MainActivity.this, LeaveMessage.class);//打开另一个界面
			startActivity(message);
			finish();//隐藏当前界面
			break;
		case R.id.img_Set://设置 
			Intent set=new Intent();
			set.setClass(MainActivity.this, SetSystem.class);//打开另一个界面
			startActivity(set);
			finish();//隐藏当前界面
			break;

		default:
			break;
		}
		
	}

}

package com.nnddkj.communication;

import java.lang.reflect.Type;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.nnddkj.communication.myadapter.myMessageAdapter;
import com.nnddkj.communication.util.Message_Uil;
import com.nnddkj.model.Model;

public class LeaveMessage extends Activity  implements OnClickListener{
	private EditText ed_inputmessage;
	private Button btn_submitmessage;
	private String name;
	private String time,message;
    private myMessageAdapter adapter;
    private List<Message_Uil> list=new ArrayList<Message_Uil>();
    private  ListView list_message;
@Override
protected void onCreate(Bundle savedInstanceState) {
	// TODO Auto-generated method stub
	super.onCreate(savedInstanceState);
	setContentView(R.layout.leave_message);
	init();
}
/**
 * 程序初始化操作
 */
private void init() {
	ed_inputmessage=(EditText) findViewById(R.id.ed_inputmessage);
	btn_submitmessage=(Button) findViewById(R.id.btn_submitmessage);
	list_message= (ListView) findViewById(R.id.list_message);
	btn_submitmessage.setOnClickListener(this);
	//读取保存的用户名
	SharedPreferences sp=getSharedPreferences("user_config", Context.MODE_PRIVATE);
	 name=sp.getString("name", null);
	 //获取系统时间
	 SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-ddHH:mm:ss",Locale.getDefault());
	  time=format.format(new Date());
	  getMessage();
}
/**
 * 获取留言信息
 */
private void getMessage() {
    String url=Model.MAIN+Model.GET_MESSAGE;
    AsyncHttpClient client=new AsyncHttpClient();
    client.get(url, new AsyncHttpResponseHandler(){
    	@Override
    	public void onSuccess(String datas) {
    		Log.d("json", datas);
    		try {
    			//使用Gson来进行解释数据包
        		Type type=new TypeToken<LinkedList<Message_Uil>>(){
        			
        		}.getType();
        		Gson jsonData=new Gson();
        		LinkedList<Message_Uil> linked=jsonData.fromJson(datas, type);
        		for (Iterator iterator=linked.iterator();iterator.hasNext();) {
        			Message_Uil messageUser=new Message_Uil();
        			Message_Uil message=(Message_Uil) iterator.next();
        			messageUser.setName(message.getName());
        			messageUser.setMessage(message.getMessage());
        			messageUser.setTime(message.getTime());
        			list.add(messageUser);//添加 到集合里面
        			
    			}
        		//添加到容器里面显示出来
        		  adapter=new myMessageAdapter(LeaveMessage.this,list);
        		  list_message.setAdapter(adapter);
        		  list_message.setDividerHeight(0); //去掉黑线
			} catch (Exception e) {
				// TODO: handle exception
			}
    		
    		
    	}
    	@Override
    	public void onFailure(Throwable arg0) {
    		Toast.makeText(LeaveMessage.this, "网络错误", Toast.LENGTH_SHORT).show();
    		super.onFailure(arg0);
    	}
    });
	
}
@Override
public void onClick(View v) {
	int id=v.getId();
	switch (id) {
	case R.id.btn_submitmessage:
		String message=ed_inputmessage.getText().toString();
		if(TextUtils.isEmpty(message)){
			Toast.makeText(LeaveMessage.this, "内容不能为空", Toast.LENGTH_SHORT).show();
		}
		httpMessage();
		break;

	default:
		break;
	}
	
}
/**
 * 执行提交发布留言信息
 */
private void httpMessage() {
	message=ed_inputmessage.getText().toString();
	String url=Model.MAIN+Model.LEAVE_MESSAGE+name+Model.MESSAGE+message+Model.TIME+time;
	AsyncHttpClient client=new AsyncHttpClient();
	client.get(url, new AsyncHttpResponseHandler(){
		@Override
		public void onSuccess(String arg0) {
			Toast.makeText(LeaveMessage.this, "提交成功", Toast.LENGTH_SHORT).show();
			finish();
			Intent main=new Intent();
			main.setClass(LeaveMessage.this, MainActivity.class);
			startActivity(main);
		}
		@Override
		public void onFailure(Throwable arg0) {
			Toast.makeText(LeaveMessage.this, "网络错误", Toast.LENGTH_SHORT).show();
			super.onFailure(arg0);
		}
	});
	
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
	//这里监听用户按手机返回健  ，隐藏当前界面，返回主界面
	finish();
	Intent main=new Intent();
	main.setClass(LeaveMessage.this, MainActivity.class);
	startActivity(main);
	return super.onKeyDown(keyCode, event);
}
}

更多的请获取源码加QQ群：QQ群：259157059