AsyncHttpClient簡介：

AsyncHttpClient庫 基於Apache的HttpClient框架,是一個非同步的httpClient, 所有的http請求都在子執行緒中,但是callback執行的執行緒和建立這個callback的執行緒是同一個(也即主執行緒建立的callback那麼執行的時候也是在主執行緒中)。

實現get和post請求：

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

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