【Android学习笔记】HTTP POST & WorkThread

HTTP Post的简单用法，和多线程的简单用法：

WebService：

  

   [WebMethod]
 
   public
    
   bool
    Login(
   string
    account,
   string
    password)
 {
 
   if
    (
   "
   larrylee
   "
    
   ==
    account 
   &
    
   "
   123456
   "
    
   ==
    password)
 
   return
    
   true
   ;
 
   else
   
 
   return
    
   false
   ;
 }
  

Login Activity：

  

   package
    com.mtk.lc.LoginDemo;


   import
    java.util.ArrayList;

   import
    java.util.List;


   import
    org.apache.http.NameValuePair;

   import
    org.apache.http.message.BasicNameValuePair;


   import
    android.app.Activity;

   import
    android.os.Bundle;

   import
    android.os.Handler;

   import
    android.os.Message;

   import
    android.view.View;

   import
    android.widget.Button;

   import
    android.widget.EditText;

   import
    android.widget.Toast;


   public
    
   class
    LoginDemo 
   extends
    Activity {
 EditText editTextAccount;
 EditText editTextPsw;
 Button buttonLogin;
 
   /**
    Called when the activity is first created. 
   */
   
 @Override
 
   public
    
   void
    onCreate(Bundle savedInstanceState) {
 
   super
   .onCreate(savedInstanceState);
 setContentView(R.layout.main);
 editTextAccount
   =
   (EditText) findViewById(R.id.editTextAccount);
 editTextPsw
   =
   (EditText) findViewById(R.id.editTextPsw);
 buttonLogin
   =
   (Button) findViewById(R.id.buttonLogin);
 buttonLogin.setOnClickListener(
   new
    View.OnClickListener() {
 
 @Override
 
   public
    
   void
    onClick(View v) {
 List
   <
   NameValuePair
   >
    params
   =
   new
    ArrayList
   <
   NameValuePair
   >
   ();
 params.add(
   new
    BasicNameValuePair(
   "
   account
   "
   , editTextAccount.getText().toString()));
   //
   传递参数
   

    params.add(
   new
    BasicNameValuePair(
   "
   password
   "
   , editTextPsw.getText().toString()));
   //
   传递参数
   

    HTTPThread httpThread
   =
   new
    HTTPThread(loginHandler);
 
   //
   在工作线程中执行耗时任务，防止UI线程阻塞
   

    httpThread.doStart(
   "
   http://10.0.2.2:2161/WebSite1/Service.asmx/Login
   "
   , params, LoginDemo.
   this
   );
 
   //
   10.0.2.2为电脑对于模拟器而言的IP地址。
   

    }
 });
 }
 
   private
    Handler loginHandler
   =
   new
    Handler(){
 
   public
    
   void
    handleMessage(Message message) {
 
   switch
    (message.what) {
 
   case
    
   1
   :
   //
   程序执行正常
   

    Boolean res
   =
   message.getData().getBoolean(
   "
   login
   "
   );
 
   if
   (res){
   //
   成功登陆
   

    Toast.makeText(LoginDemo.
   this
   , 
   "
   Successd!
   "
   , Toast.LENGTH_LONG).show();
 }
   else
   {
   //
   登陆失败
   

    Toast.makeText(LoginDemo.
   this
   , 
   "
   Fail!
   "
   , Toast.LENGTH_LONG).show();
 }
 
   break
   ;

 
   default
   :
   //
   程序异常...（网络连接出错）
   

    Toast.makeText(LoginDemo.
   this
   , 
   "
   Error!
   "
   , Toast.LENGTH_LONG).show();
 
   break
   ;
 }
 }
 };
 
}
  

Http Thread

  

   package
    com.mtk.lc.LoginDemo;


   import
    java.io.IOException;

   import
    java.util.List;


   import
    org.apache.http.NameValuePair;

   import
    org.apache.http.ParseException;

   import
    org.apache.http.client.ClientProtocolException;

   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.protocol.HTTP;

   import
    org.apache.http.util.EntityUtils;


   import
    android.app.ProgressDialog;

   import
    android.content.Context;

   import
    android.content.DialogInterface;

   import
    android.os.Bundle;

   import
    android.os.Handler;

   import
    android.os.Message;


   public
    
   class
    HTTPThread 
   extends
    Thread {
 ProgressDialog pdDialog 
   =
    
   null
   ;
 String urlString 
   =
    
   null
   ;
 List
   <
   NameValuePair
   >
    params 
   =
    
   null
   ;
 Handler handler 
   =
    
   null
   ;

 
   public
    HTTPThread(Handler handler) {
 
   this
   .handler 
   =
    handler;
 }

 
   public
    
   void
    doStart(String urlString, List
   <
   NameValuePair
   >
    params,
 Context context) {
   //
   进行一些初始化工作然后调用start()让线程运行
   

    
   this
   .urlString 
   =
    urlString;
 
   this
   .params 
   =
    params;
 pdDialog 
   =
    
   new
    ProgressDialog(context);
 pdDialog.setTitle(
   "
   Login...
   "
   );
 pdDialog.setMessage(
   "
   Connecting to Server...
   "
   );
 pdDialog.setIndeterminate(
   true
   );
 pdDialog.setButton(
   "
   Cancel
   "
   , 
   new
    DialogInterface.OnClickListener() {
 
   public
    
   void
    onClick(DialogInterface dialog, 
   int
    which) {
 pdDialog.cancel();
 }
 });
 pdDialog.show();
 
   this
   .start();
 }

 @Override
 
   public
    
   void
    run() {
 Message msg 
   =
    
   new
    Message();
 Bundle data 
   =
    
   new
    Bundle();
 
   try
    {
 
   boolean
    result 
   =
    webServiceLogin();
   //
   执行网络服务请求，耗时操作。。。
   

    msg.what
   =
   1
   ;
 data.putBoolean(
   "
   login
   "
   , result);
 data.putString(
   "
   info
   "
   , 
   "
   normal
   "
   );
 msg.setData(data);
 } 
   catch
    (ParseException e) {
 msg.what
   =
   2
   ;
 data.putString(
   "
   info
   "
   , 
   "
   Error
   "
   );
 msg.setData(data);
 e.printStackTrace();
 } 
   catch
    (ClientProtocolException e) {
 msg.what
   =
   2
   ;
 data.putString(
   "
   info
   "
   , 
   "
   Error
   "
   );
 msg.setData(data);
 e.printStackTrace();
 } 
   catch
    (IOException e) {
 msg.what
   =
   2
   ;
 data.putString(
   "
   info
   "
   , 
   "
   Error
   "
   );
 msg.setData(data);
 e.printStackTrace();
 } 
   finally
    {
 pdDialog.dismiss();
 handler.sendMessage(msg);
 }
 }

 
   private
    
   boolean
    webServiceLogin() 
   throws
    ParseException,
 ClientProtocolException, IOException {
 HttpClient httpClient 
   =
    
   new
    DefaultHttpClient();
   //
   HTTP客户端，使用默认客户端
   

    HttpPost httpPost 
   =
    
   new
    HttpPost(urlString);
   //
   建立HttpPost对象
   

    httpPost.setEntity(
   new
    UrlEncodedFormEntity(params, HTTP.UTF_8));
   //
   设置参数
   

    String res 
   =
    EntityUtils.toString(httpClient.execute(httpPost)
 .getEntity());
   //
   执行并返回结果：
 

   //
    <?xml version="1.0" encoding="utf-8" ?> 

   //
    <boolean xmlns="
   http://tempuri.org/
   ">true</boolean> 
   

    
 
   if
    (res.contains(
   "
   true
   "
   )) {
   //
   偷个懒不对XML进行解析了，返回中有true就是登陆成功了。
   

    
   return
    
   true
   ;
 }
 
   return
    
   false
   ;
 }
}
  

Layout：

  

   <?
   xml version="1.0" encoding="utf-8"
   ?>
   

   <
   LinearLayout 
   xmlns:android
   ="http://schemas.android.com/apk/res/android"
   
 android:orientation
   ="vertical"
    android:layout_width
   ="fill_parent"
   
 android:layout_height
   ="fill_parent"
   >
   
 
   <
   TextView 
   android:id
   ="@+id/textView1"
    android:layout_width
   ="wrap_content"
   
 android:layout_height
   ="wrap_content"
    android:text
   ="Account:"
   
 android:textSize
   ="10pt"
   ></
   TextView
   >
   
 
   <
   EditText 
   android:layout_height
   ="wrap_content"
   
 android:layout_width
   ="match_parent"
    android:id
   ="@+id/editTextAccount"
   ></
   EditText
   >
   
 
   <
   TextView 
   android:id
   ="@+id/textView2"
    android:layout_width
   ="wrap_content"
   
 android:layout_height
   ="wrap_content"
    android:textSize
   ="10pt"
   
 android:text
   ="Pass Word:"
   ></
   TextView
   >
   
 
   <
   EditText 
   android:layout_height
   ="wrap_content"
   
 android:layout_width
   ="match_parent"
    android:id
   ="@+id/editTextPsw"
   
 android:password
   ="true"
   ></
   EditText
   >
   
 
   <
   Button 
   android:layout_width
   ="wrap_content"
   
 android:layout_height
   ="wrap_content"
    android:id
   ="@+id/buttonLogin"
   
 android:text
   ="Login"
   ></
   Button
   >
   

   </
   LinearLayout
   >