MainActivity.java

package com.tsh.test;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;import java.net.HttpURLConnection;import java.net.URL;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {    public Button loginBtn;    public TextView loginUserName;    public TextView loginPassword;    public static String API="http://mail.sina.net/loginxxx";    public LoginHandler loginHandler;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获取View对象        loginBtn=(Button) findViewById(R.id.loginBtn);        loginUserName=(TextView) findViewById(R.id.loginUsername);        loginPassword=(TextView) findViewById(R.id.loginPassword);        //给View对象设置点击事件        loginBtn.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                //开启新线程                Thread loginThread=new Thread(new LoginRunable());                loginThread.start();            }        });        loginHandler=new LoginHandler();    }    //实现Runable接口,开启新线程    class LoginRunable implements Runnable{        @Override        public void run() {            try {                URL url=new URL(API);                HttpURLConnection http=(HttpURLConnection) url.openConnection();                http.setRequestMethod("POST");                http.setDoInput(true);                http.setDoOutput(true);                OutputStream ops=http.getOutputStream();                PrintWriter pw=new PrintWriter(ops);                String username=loginUserName.getText().toString();                String password=loginPassword.getText().toString();                pw.write("email="+username+"&psw="+password+"&loginfrom=app&output=json");                pw.flush();                                InputStream ins=http.getInputStream();                byte[] buffer = new byte[1024];                int length=0;                StringBuilder sb=new StringBuilder();                while((length=ins.read(buffer))!=-1){                    sb.append(new String(buffer,0,length));                }                                Message msg=new Message();                msg.what=1;                msg.obj=sb.toString();                loginHandler.sendMessage(msg);            } catch (Exception e) {                // TODO Auto-generated catch block                e.printStackTrace();            }                    }    }    //传递消息的handle    class LoginHandler extends Handler{        @Override        public void handleMessage(Message msg) {            String loginResponse=(String) msg.obj;            System.out.println(loginResponse);            Toast.makeText(MainActivity.this, loginResponse, 10).show();            Intent intent=new Intent(MainActivity.this, MailIndexActivity.class);            //startActivity(intent);        }    }}

main_activity.xml