Java tutorial
/* * Copyright (c) 2013 Mark Prichard * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.appdynamics.demo.gasp.service; import android.app.IntentService; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.os.ResultReceiver; import android.util.Log; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.StatusLine; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpDelete; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.methods.HttpPut; import org.apache.http.client.methods.HttpRequestBase; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.URI; import java.net.URISyntaxException; import java.util.ArrayList; import java.util.List; /** * Closely modeled on Neil Goodman's Android REST tutorials * https://github.com/posco2k8/rest_service_tutorial * https://github.com/posco2k8/rest_loader_tutorial.git * * @author Mark Prichard */ public class RESTIntentService extends IntentService { private static final String TAG = RESTIntentService.class.getName(); private static final int GET = 0x1; public static final int POST = 0x2; private static final int PUT = 0x3; private static final int DELETE = 0x4; public static final String EXTRA_HTTP_VERB = "com.appdynamics.gasp.EXTRA_HTTP_VERB"; public static final String EXTRA_PARAMS = "com.appdynamics.gasp.EXTRA_PARAMS"; public static final String EXTRA_HEADERS = "com.appdynamics.gasp.EXTRA_HEADERS"; public static final String EXTRA_RESULT_RECEIVER = "com.appdynamics.gasp.EXTRA_RESULT_RECEIVER"; public static final String REST_RESULT = "com.appdynamics.gasp.REST_RESULT"; public RESTIntentService() { super(TAG); } @Override protected void onHandleIntent(Intent intent) { Uri action = intent.getData(); Bundle extras = intent.getExtras(); if (extras == null || action == null || !extras.containsKey(EXTRA_RESULT_RECEIVER)) { Log.e(TAG, "You did not pass extras or data with the Intent."); return; } int verb = extras.getInt(EXTRA_HTTP_VERB, GET); Bundle params = extras.getParcelable(EXTRA_PARAMS); Bundle headers = extras.getParcelable(EXTRA_HEADERS); ResultReceiver receiver = extras.getParcelable(EXTRA_RESULT_RECEIVER); try { HttpRequestBase request = null; // Get query params from Bundle and build URL switch (verb) { case GET: { request = new HttpGet(); attachUriWithQuery(request, action, params); } break; case DELETE: { request = new HttpDelete(); attachUriWithQuery(request, action, params); } break; case POST: { request = new HttpPost(); request.setURI(new URI(action.toString())); HttpPost postRequest = (HttpPost) request; if (params != null) { UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(paramsToList(params)); postRequest.setEntity(formEntity); } } break; case PUT: { request = new HttpPut(); request.setURI(new URI(action.toString())); HttpPut putRequest = (HttpPut) request; if (params != null) { UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(paramsToList(params)); putRequest.setEntity(formEntity); } } break; } // Get Headers from Bundle for (BasicNameValuePair header : paramsToList(headers)) { request.setHeader(header.getName(), header.getValue()); } if (request != null) { HttpClient client = new DefaultHttpClient(); Log.d(TAG, "Executing request: " + verbToString(verb) + ": " + action.toString()); HttpResponse response = client.execute(request); HttpEntity responseEntity = response.getEntity(); StatusLine responseStatus = response.getStatusLine(); int statusCode = responseStatus != null ? responseStatus.getStatusCode() : 0; if ((responseEntity != null) && (responseStatus.getStatusCode() == 200)) { Bundle resultData = new Bundle(); resultData.putString(REST_RESULT, EntityUtils.toString(responseEntity)); receiver.send(statusCode, resultData); } else { receiver.send(statusCode, null); } } } catch (URISyntaxException e) { Log.e(TAG, "URI syntax was incorrect. " + verbToString(verb) + ": " + action.toString(), e); receiver.send(0, null); } catch (UnsupportedEncodingException e) { Log.e(TAG, "A UrlEncodedFormEntity was created with an unsupported encoding.", e); receiver.send(0, null); } catch (ClientProtocolException e) { Log.e(TAG, "There was a problem when sending the request.", e); receiver.send(0, null); } catch (IOException e) { Log.e(TAG, "There was a problem when sending the request.", e); receiver.send(0, null); } catch (Exception e) { e.printStackTrace(); } } private static void attachUriWithQuery(HttpRequestBase request, Uri uri, Bundle params) { try { if (params == null) { request.setURI(new URI(uri.toString())); } else { Uri.Builder uriBuilder = uri.buildUpon(); // Loop through our params and append them to the Uri. for (BasicNameValuePair param : paramsToList(params)) { uriBuilder.appendQueryParameter(param.getName(), param.getValue()); } uri = uriBuilder.build(); request.setURI(new URI(uri.toString())); } } catch (URISyntaxException e) { Log.e(TAG, "URI syntax was incorrect: " + uri.toString(), e); } } private static String verbToString(int verb) { switch (verb) { case GET: return "GET"; case POST: return "POST"; case PUT: return "PUT"; case DELETE: return "DELETE"; } return ""; } private static List<BasicNameValuePair> paramsToList(Bundle params) { ArrayList<BasicNameValuePair> formList = new ArrayList<BasicNameValuePair>(params.size()); for (String key : params.keySet()) { Object value = params.get(key); if (value != null) formList.add(new BasicNameValuePair(key, value.toString())); } return formList; } }