Android Open Source - spring-android-samples Http Post Json Xml Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2010-2014 the original author or authors.
 *//from  w w  w  .  j  a  va2 s. co m
 * 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.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.xml.SimpleXmlHttpMessageConverter;
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 HttpPostJsonXmlActivity extends AbstractAsyncActivity {

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

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

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

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

  // ***************************************
  // Private methods
  // ***************************************
  private void showResult(String result) {
    if (result != null) {
      // display a notification to the user with the response message
      Toast.makeText(this, result, Toast.LENGTH_LONG).show();
    } else {
      Toast.makeText(this, "I got null, something happened!", Toast.LENGTH_LONG).show();
    }
  }

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

    private Message message;

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

      // build the message object
      EditText editText = (EditText) findViewById(R.id.edit_text_message_id);

      message = new Message();

      try {
        message.setId(Integer.parseInt(editText.getText().toString()));
      } catch (NumberFormatException e) {
        message.setId(0);
      }

      editText = (EditText) findViewById(R.id.edit_text_message_subject);
      message.setSubject(editText.getText().toString());

      editText = (EditText) findViewById(R.id.edit_text_message_text);
      message.setText(editText.getText().toString());
    }

    @Override
    protected String doInBackground(MediaType... params) {
      try {
        if (params.length <= 0) {
          return null;
        }

        MediaType mediaType = params[0];

        // The URL for making the POST request
        final String url = getString(R.string.base_uri) + "/sendmessage";

        HttpHeaders requestHeaders = new HttpHeaders();

        // Sending a JSON or XML object i.e. "application/json" or "application/xml"
        requestHeaders.setContentType(mediaType);

        // Populate the Message object to serialize and headers in an
        // HttpEntity object to use for the request
        HttpEntity<Message> requestEntity = new HttpEntity<Message>(message, requestHeaders);

        // Create a new RestTemplate instance
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new StringHttpMessageConverter());
        if (mediaType == MediaType.APPLICATION_JSON) {
          restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
        } else if (mediaType == MediaType.APPLICATION_XML) {
          restTemplate.getMessageConverters().add(new SimpleXmlHttpMessageConverter());
        }

        // Make the network request, posting the message, expecting a String in response from the server
        ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST, requestEntity,
            String.class);

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

      return null;
    }

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

  }

}

Java Source Code List

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