使用开源框架android-async-http-1.4.8.jar与服务器传输数据

public class MainActivity extends Activity {

private TextView username;
private TextView password;
private Button button;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取用户上传的用户名和密码
username = (TextView) findViewById(R.id.username);
password = (TextView) findViewById(R.id.password);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
String us = username.getText().toString();
String pd = password.getText().toString();
//需要将android-async-http-**.jar放在libs包里
AsyncHttpClient client = new AsyncHttpClient();
//指定url路径
String url = "http://acm.hpu.edu.cn/PowerWeb/system/ElectricAction_getElecMonth.do?format=json";
//封装文件上传的参数
RequestParams params = new RequestParams();
params.put("username", un);
params.put("password", pd);
//设置连接超时
client.setConnectTimeout(5000);
//使用post方式上传参数
client.post(url,params, new AsyncHttpResponseHandler() {
//连接开始
public void onStart() {
System.out.println("连接开始");
}

//连接失败
public void onFailure(int arg0, Header[] arg1,
byte[] arg2, Throwable arg3) {
System.out.println("连接失败");
}
//连接成功
public void onSuccess(int arg0, Header[] arg1,
byte[] arg2) {
//接收服务器返还的参数arg2
String str = new String(arg2);
System.out.println("str:"+str);

}

//连接结束
public void onFinish() {
System.out.println("连接结束");
}
});

}
});}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

}