主要代码如下：

package src.seagm;

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.HttpClient;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.protocol.HTTP;

import org.json.JSONObject;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.CompoundButton;

import android.widget.CompoundButton.OnCheckedChangeListener;

import android.widget.EditText;

import android.widget.Toast;

public class LoginActivity extends Activity {

private EditText usernameText;

private EditText passwordText;

private CheckBox persistentBox;

private Button loginButton;

//设置是否保持登录

private boolean persistent = true;//初始化保持登录

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

initWidget();//初始化组件

//监听保持登录的checkbox

persistentBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override

public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

if( isChecked ){//保持登录

persistent = true;

}else{

persistent = false;

}

}

});

//点击登录

loginButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

String username = usernameText.getText().toString().trim();

String password = passwordText.getText().toString().trim();

//开始以post方式提交数据

//String strUrl = "http://www.seagm.cn/r=login/do";

String strUrl = "http://192.168.0.105/interface.php";

HttpPost httpRequest = new HttpPost(strUrl);

//提交的参数以键值对的形式提交

List<NameValuePair> params = new ArrayList<NameValuePair>();

params.add(new BasicNameValuePair("username", username));

params.add(new BasicNameValuePair("password", password));

params.add(new BasicNameValuePair("persistent", String.valueOf(persistent)));

try {

//发送请求

httpRequest.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));//字符编码

//创建接收响应的客户端对象

HttpClient httpClient = new DefaultHttpClient();

//接收响应

HttpResponse httpResponse = httpClient.execute(httpRequest);

if( httpResponse.getStatusLine().getStatusCode() == 200 ){//请求成功

//将返回响应的数据取出来并处理(返回的数据是json格式)

InputStream inputStream = httpResponse.getEntity().getContent();

StringBuilder builder = new StringBuilder();

//读取数据流

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

String line = "";

while( (line = bufferedReader.readLine()) != null ){

builder.append(line);

}

JSONObject jsonObject = new JSONObject(builder.toString());

int returnCode = Integer.parseInt(jsonObject.getString("code"));

if(returnCode == 1){//登录成功

System.out.print(jsonObject);

}else{

Toast.makeText(LoginActivity.this, "登录失败", Toast.LENGTH_LONG).show();

}

}else{

Toast.makeText(LoginActivity.this, "Error Response: " + httpResponse.getStatusLine().toString(), Toast.LENGTH_LONG).show();

}

} catch (Exception e) {

Toast.makeText(LoginActivity.this, e.getMessage().toString(), Toast.LENGTH_LONG).show();

e.printStackTrace();

}

}

});

}

private void initWidget(){

usernameText = (EditText) this.findViewById(R.id.username);

passwordText = (EditText) this.findViewById(R.id.password);

persistentBox = (CheckBox) this.findViewById(R.id.presistent);

loginButton = (Button) this.findViewById(R.id.login);

}

}