012_02 asynchttpClient用户登录

android-async-http是专门针对Android在Apache的HttpClient基础上构建的异步的callback-based http client。

所有的请求全在UI线程之外发生，而callback发生在创建它的线程中，应用了Android的Handler发送消息机制。你也可

以把AsyncHttpClient应用在Service中或者后台线程中，库代码会自动识别出它所运行的context。

使用android-async-http只需要三步：

1. 创建一个AsyncHttpClient；

2. （可选的）通过RequestParams对象设置请求参数；

3. 调用AsyncHttpClient的某个get方法，传递你需要的（成功和失败时）callback接口实现，一般都是匿名内部类

项目的官方网站：http://loopj.com/android-async-http/

对应的github地址：https://github.com/loopj/android-async-http

需要导入的第三方开源包com.loopj.android.http

 1 package com.example.day12_02login;
 2
 3 import java.net.URLEncoder;
 4
 5 import org.apache.http.Header;
 6
 7 import com.loopj.android.http.AsyncHttpClient;
 8 import com.loopj.android.http.AsyncHttpResponseHandler;
 9 import com.loopj.android.http.RequestParams;
10
11 import android.app.Activity;
12 import android.os.Bundle;
13 import android.os.Handler;
14 import android.os.Message;
15 import android.view.View;
16 import android.widget.EditText;
17 import android.widget.Toast;
18
19 public class MainActivity extends Activity {
20
21     @Override
22     protected void onCreate(Bundle savedInstanceState) {
23         super.onCreate(savedInstanceState);
24         setContentView(R.layout.activity_main);
25     }
26
27     Handler hanlder = new Handler(){
28         @Override
29         public void handleMessage(Message msg) {
30             super.handleMessage(msg);
31             switch (msg.what) {
32             case 1:
33                 Toast.makeText(MainActivity.this, (String)msg.obj, 1).show();
34                 break;
35             case 2:
36                 Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();
37                 break;
38             default:
39                 break;
40             }
41         }
42     };
43
44     class Myhandle extends AsyncHttpResponseHandler{
45         //200 进入
46         @Override
47         public void onSuccess(int statusCode, Header[] headers,
48                 byte[] responseBody) {
49             //这个里面表示链接成功。
50             //应该在这里个去处理成功之后的事情。
51             System.out
52                     .println("MainActivity.login(...).Myhandle.onSuccess()"+statusCode);
53             Toast.makeText(MainActivity.this, new String(responseBody)  , 1).show();
54         }
55         //!200进入
56         @Override
57         public void onFailure(int statusCode, Header[] headers,
58                 byte[] responseBody, Throwable error) {
59         }
60     }
61
62     //Async http client 的get请求
63     public void login(View v){
64         EditText et_username = (EditText) findViewById(R.id.et_uername);
65         EditText et_password = (EditText) findViewById(R.id.et_password);
66
67         final String username= et_username.getText().toString();
68         final String password= et_password.getText().toString();
69         //http://localhost/LoginDemo/servlet/Login?username=wangdao&password=123456
70         String path = "http://192.168.3.30:8080/LoginDemo/servlet/Login?username="+URLEncoder.encode(username)+"&password="+password;
71
72          AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
73          asyncHttpClient.get(path, new Myhandle());
74
75     }
76
77     //Async http client Post 请求实现
78     public void login2(View v){
79
80         EditText et_username = (EditText) findViewById(R.id.et_uername);
81         EditText et_password = (EditText) findViewById(R.id.et_password);
82
83         final String username= et_username.getText().toString();
84         final String password= et_password.getText().toString();
85         //http://localhost/LoginDemo/servlet/Login
86         //发请求的线程
87         String path = "http://192.168.3.30:8080/LoginDemo/servlet/Login";
88          AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
89
90          RequestParams rp= new RequestParams();
91          rp.put("username", username);
92          rp.put("password", password);
93
94          asyncHttpClient.post(path, rp, new Myhandle());
95     }
96
97 }

activity_main.xml和 MyEclipse服务器端代码与 012_01HttpClient用户登录 相同。