HttpPostStringActivity.java

/*
 * Copyright 2010-2014 the original author or authors.
 *
 * 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 org.springframework.android.showcase.rest;

import org.springframework.android.showcase.AbstractAsyncActivity;
import org.springframework.android.showcase.R;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
 * @author Roy Clarkson
 * @author Helena Edelson
 * @author Pierre-Yves Ricau
 */
public class HttpPostStringActivity extends AbstractAsyncActivity {

	protected static final String TAG = HttpPostStringActivity.class.getSimpleName();

	// ***************************************
	// Activity methods
	// ***************************************
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.http_post_string_activity_layout);

		// Initiate the POST request when the button is clicked
		final Button button = (Button) findViewById(R.id.button_post_string);
		button.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				new PostMessageTask().execute();
			}
		});
	}

	// ***************************************
	// Private methods
	// ***************************************
	private void showResult(String result) {
		// display a notification to the user with the response message
		Toast.makeText(this, result, Toast.LENGTH_LONG).show();
	}

	// ***************************************
	// Private classes
	// ***************************************
	private class PostMessageTask extends AsyncTask<Void, Void, String> {

		private String text;

		@Override
		protected void onPreExecute() {
			showLoadingProgressDialog();

			// retrieve the message text from the EditText field
			EditText editText = (EditText) findViewById(R.id.edit_text_message);

			text = editText.getText().toString();
		}

		@Override
		protected String doInBackground(Void... params) {
			try {
				// The URL for making the POST request
				final String url = getString(R.string.base_uri) + "/sendmessage";

				// Create a new RestTemplate instance
				RestTemplate restTemplate = new RestTemplate();
				restTemplate.getMessageConverters().add(new StringHttpMessageConverter());

				// Make the network request, posting the message, expecting a String in response from the server
				String response = restTemplate.postForObject(url, text, String.class);

				// Return the response body to display to the user
				return response;
			} catch (Exception e) {
				Log.e(TAG, e.getMessage(), e);
			}

			return null;
		}

		@Override
		protected void onPostExecute(String result) {
			dismissProgressDialog();
			showResult(result);
		}

	}

}