使用AsyncHttpClient 实现get和post请求

AsyncHttpClient简介：

AsyncHttpClient庫 基於Apache的HttpClient框架,是一個異步的httpClient, 所有的http請求都在子線程中,但是callback執行的線程和創建這個callback的線程是同一個(也即主線程創建的callback那麼執行的時候也是在主線程中)。

实现get和post请求：

public class MainActivity extends Activity {

private EditText usernameET;
private EditText passwordET;
private AsyncHttpClient client;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
usernameET = (EditText) this.findViewById(R.id.UsernamET);
passwordET = (EditText) this.findViewById(R.id.PaswordET);
client = new AsyncHttpClient();
}
public void get(View v) throws Exception{

String username = usernameET.getText().toString().trim();
String password = passwordET.getText().toString().trim();
String path = "";
String params = "username=" + URLEncoder.encode(username, "UTF-8") + "&password="+  URLEncoder.encode(password, "UTF-8");

client.get(path+"?"+params, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "登陆成功", Toast.LENGTH_SHORT)
.show();
}

@Override
public void onFailure(int statusCode, Header[] headers,
byte[] responseBody, Throwable error) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "登陆失败", Toast.LENGTH_SHORT)
.show();
}
});
}
public void post(View v){
String username = usernameET.getText().toString().trim();
String password = passwordET.getText().toString().trim();
String path = "";
RequestParams params  = new RequestParams();
params.put("username", username);
params.put("password", password);
client.post(path, params, new AsyncHttpResponseHandler() {

@Override
public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "登陆成功", Toast.LENGTH_SHORT)
.show();
}

@Override
public void onFailure(int statusCode, Header[] headers,
byte[] responseBody, Throwable error) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "登陆失败", Toast.LENGTH_SHORT)
.show();
}
});
}
}

使用AsyncHttpClient实现网络图片的读取：

public void onClick(View v){

String path = pathText.getText().toString().trim();
client.get(path, new AsyncHttpResponseHandler() {

@Override
public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
// TODO Auto-generated method stub
Bitmap image = BitmapFactory.decodeByteArray(responseBody, 0, responseBody.length);
Image.setImageBitmap(image);
Toast.makeText(getApplicationContext(), "获取成功", Toast.LENGTH_SHORT)
.show();
}

@Override
public void onFailure(int statusCode, Header[] headers,
byte[] responseBody, Throwable error) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "获取失败", Toast.LENGTH_SHORT)
.show();
}
});
}

当然，这个是最基础的用法了，之后会有关于AsyncHttpClient的上传和下载等用法