Cual es mejor, loader o AsyncTask?

Quiero saber la diferencia entre Android loader y AsyncTask, aquí la demo en Loader:

package com.android.loaderdemo; import org.json.JSONArray; import org.json.JSONObject; import android.app.Activity; import android.app.LoaderManager.LoaderCallbacks; import android.content.AsyncTaskLoader; import android.content.Context; import android.content.Loader; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.widget.TextView; import com.android.webprocessor.Http_GetServices; public class MainActivity extends Activity implements LoaderCallbacks<String> { TextView txt_username, txt_userEmail, txt_password, txt_role, txt_secretQuestion, txt_answer, txt_zipcode; private static String url = "http://dotstg1.xyz.com/loud/webservcies/GetUserProfile.svc/GetUserProfile/124"; static String response; static String name, email, Pasword, Answer, RoleId, SecretQuestion, Zip; static String useResult = null; static JSONArray userParams = null; private static final int THE_LOADER = 0x01; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Log.e("onCreate", "onCreate"); // getSuLoaderManager().initLoader(THE_LOADER, null, this).forceLoad(); getLoaderManager().initLoader(THE_LOADER, null, this).forceLoad(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. Log.e("onCreateOptionsMenu", "onCreateOptionsMenu"); getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public Loader<String> onCreateLoader(int arg0, Bundle arg1) { Log.e("onCreateLoader", "onCreateLoader"); SampleLoader loader = new SampleLoader(this); return loader; } @Override public void onLoadFinished(Loader<String> arg0, String arg1) { txt_username = (TextView) findViewById(R.id.name); txt_userEmail = (TextView) findViewById(R.id.email); txt_password = (TextView) findViewById(R.id.password); txt_role = (TextView) findViewById(R.id.role); txt_secretQuestion = (TextView) findViewById(R.id.secretquestion); txt_zipcode = (TextView) findViewById(R.id.zipcode); txt_answer = (TextView) findViewById(R.id.answer); txt_username.setText(name); txt_userEmail.setText(email); txt_password.setText(Pasword); txt_role.setText(RoleId); txt_secretQuestion.setText(SecretQuestion); txt_answer.setText(Answer); txt_zipcode.setText(Zip); Log.e("onLoadFinished", "onLoadFinished"); } @Override public void onLoaderReset(Loader<String> arg0) { Log.e("onLoaderReset", "onLoaderReset"); } private static class SampleLoader extends AsyncTaskLoader<String> { @Override public Context getContext() { Log.e("getContext", "getContext"); return super.getContext(); } @Override public int getId() { Log.e("getId", "getId"); return super.getId(); } public SampleLoader(Context context) { super(context); Log.e("SampleLoader", "SampleLoader"); } @Override public String loadInBackground() { Log.e("loadInBackground", "loadInBackground"); try { response = Http_GetServices.connect(url); JSONObject jsonObject = new JSONObject(response); JSONObject json2 = jsonObject.getJSONObject("GetUserPrfResult"); String test = (String) json2.get("Descritption"); JSONObject json3 = json2.getJSONObject("GetUserPrfParams"); name = (String) json3.get("Name"); email = (String) json3.get("Email"); Pasword = (String) json3.get("Pasword"); RoleId = String.valueOf(json3.getInt("RoleId")); SecretQuestion = String.valueOf(json3.get("SecretQuestion")); Answer = (String) json3.get("Answer"); Zip = String.valueOf(json3.get("Zip")); } catch (Exception e) { e.printStackTrace(); } return null; } } } 

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