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

package com.example.day12_02login;

import java.net.URLEncoder;

import org.apache.http.Header;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    Handler hanlder = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
            case 1:
                Toast.makeText(MainActivity.this, (String)msg.obj, 1).show();
                break;
            case 2:
                Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();
                break;
            default:
                break;
            }
        }
    };
    
    class Myhandle extends AsyncHttpResponseHandler{
        //200 进入
        @Override
        public void onSuccess(int statusCode, Header[] headers,
                byte[] responseBody) {
            //这个里面表示链接成功。
            //应该在这里个去处理成功之后的事情。
            System.out
                    .println("MainActivity.login(...).Myhandle.onSuccess()"+statusCode);
            Toast.makeText(MainActivity.this, new String(responseBody)  , 1).show();
        }
        //!200进入
        @Override
        public void onFailure(int statusCode, Header[] headers,
                byte[] responseBody, Throwable error) {            
        }
    }   

    //Async http client 的get请求
    public void login(View v){    
        EditText et_username = (EditText) findViewById(R.id.et_uername);
        EditText et_password = (EditText) findViewById(R.id.et_password);
        
        final String username= et_username.getText().toString();
        final String password= et_password.getText().toString();        
        //http://localhost/LoginDemo/servlet/Login?username=wangdao&password=123456
        String path = "http://192.168.3.30:8080/LoginDemo/servlet/Login?username="+URLEncoder.encode(username)+"&password="+password;
    
         AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
         asyncHttpClient.get(path, new Myhandle());
         
    }

    //Async http client Post 请求实现
    public void login2(View v){
        
        EditText et_username = (EditText) findViewById(R.id.et_uername);
        EditText et_password = (EditText) findViewById(R.id.et_password);
        
        final String username= et_username.getText().toString();
        final String password= et_password.getText().toString();
        //http://localhost/LoginDemo/servlet/Login
        //发请求的线程
        String path = "http://192.168.3.30:8080/LoginDemo/servlet/Login";
         AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
         
         RequestParams rp= new RequestParams();
         rp.put("username", username);
         rp.put("password", password);
         
         asyncHttpClient.post(path, rp, new Myhandle());    
    }
 
}

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