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);  //獲取View對象  loginBtn=(Button) findViewById(R.id.loginBtn);  loginUserName=(TextView) findViewById(R.id.loginUsername);  loginPassword=(TextView) findViewById(R.id.loginPassword);  //給View對象設置點擊事件  loginBtn.setOnClickListener(new OnClickListener() {   @Override   public void onClick(View arg0) {    //開啟新線程    Thread loginThread=new Thread(new LoginRunable());    loginThread.start();   }  });  loginHandler=new LoginHandler(); } //實現Runable接口,開啟新線程 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();   }     } } //傳遞消息的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);  } }}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="${relativePackage}.${activityClass}" > <TextView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="用戶名" /> <EditText   android:hint="請輸入用戶名"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:id="@+id/loginUsername"  android:text="shihan@appdev.sinanet.com"  /> <TextView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="密碼"/> <EditText   android:hint="請輸入密碼"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:id="@+id/loginPassword"  android:text="xxxxxxx"/> <Button   android:id="@+id/loginBtn"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:text="登陸認證"  /></LinearLayout>