Android Open Source - spring-a-gram-android Home Fragment

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2014 Roy Clarkson//from   w  ww  . j  av  a 2s.  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 com.royclarkson.springagram;

import android.app.Activity;
import android.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.royclarkson.springagram.model.ApiResource;

import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.ResourceAccessException;
import org.springframework.web.client.RestTemplate;

/**
 * @author Roy Clarkson
 */
public class HomeFragment extends Fragment {

  public static final String TAG = HomeFragment.class.getSimpleName();

  private static final String ARG_API_URL = "api_url";

  private String apiUrl;

  private HomeFragmentListener homeFragmentListener;


  public HomeFragment() {
    // Required empty public constructor
  }

  public static HomeFragment newInstance(String apiUrl) {
    HomeFragment fragment = new HomeFragment();
    Bundle args = new Bundle();
    args.putString(ARG_API_URL, apiUrl);
    fragment.setArguments(args);
    return fragment;
  }


  //***************************************
  // Fragment methods
  //***************************************

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {
      this.apiUrl = getArguments().getString(ARG_API_URL);
    }
    new DownloadRootResourceTask().execute(this.apiUrl);
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
               Bundle savedInstanceState) {
    return inflater.inflate(R.layout.fragment_home, container, false);
  }

  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    setRetainInstance(true);
  }

  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
      homeFragmentListener = (HomeFragmentListener) activity;
    } catch (ClassCastException e) {
      throw new ClassCastException(activity.toString()
          + " must implement OnFragmentInteractionListener");
    }
  }

  @Override
  public void onDetach() {
    super.onDetach();
    homeFragmentListener = null;
  }


  //***************************************
  // Listener interface
  //***************************************

  public interface HomeFragmentListener {

    public void onResourceDownloadComplete(ApiResource resource);

    public void onNetworkError(String message);

  }


  // ***************************************
  // Private classes
  // ***************************************

  private class DownloadRootResourceTask extends AsyncTask<String, Void, ApiResource> {

    Exception exception;

    @Override
    protected ApiResource doInBackground(String... params) {
      try {
        final String url = params[0];
        RestTemplate restTemplate = RestUtils.getInstance();
        ResponseEntity<ApiResource> responseEntity = restTemplate.exchange(url, HttpMethod.GET,
            RestUtils.getRequestEntity(), ApiResource.class);
        return responseEntity.getBody();
      } catch (Exception e) {
        this.exception = e;
        Log.e(TAG, e.getMessage(), e);
      }

      return null;
    }

    @Override
    protected void onPostExecute(ApiResource apiResource) {
      if (homeFragmentListener != null) {
        if (this.exception != null && this.exception instanceof ResourceAccessException) {
          homeFragmentListener.onNetworkError(this.exception.getMessage());
        } else {
          homeFragmentListener.onResourceDownloadComplete(apiResource);
        }
      }
    }

  }

}

Java Source Code List

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