Android Open Source - spring-a-gram-android Photo Add Fragment

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2014 Roy Clarkson/* w w w  .  j a  v  a  2  s.  c om*/
 *
 * 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.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.royclarkson.springagram.model.Item;
import com.royclarkson.springagram.model.ItemResource;

import org.springframework.util.support.Base64;
import org.springframework.web.client.RestTemplate;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * {@link Fragment} for adding a new photo within an {@link ItemResource}
 *
 * @author Roy Clarkson
 */
public class PhotoAddFragment extends Fragment {

  private static final String TAG = PhotoAddFragment.class.getSimpleName();

  private static final String ARG_PHOTOS_LIST_URL = "photos_url";

  private static final int REQUEST_TAKE_PHOTO = 1;

  private String photosUrl;

  private PhotoAddFragmentListener photoAddFragmentListener;

  private String photoPath;


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

  public static PhotoAddFragment newInstance(String photosUrl) {
    PhotoAddFragment fragment = new PhotoAddFragment();
    Bundle args = new Bundle();
    args.putString(ARG_PHOTOS_LIST_URL, photosUrl);
    fragment.setArguments(args);
    return fragment;
  }


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

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (getArguments() != null) {
      this.photosUrl = getArguments().getString(ARG_PHOTOS_LIST_URL);
    }
    dispatchTakePictureIntent();
  }

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

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

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

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

  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_TAKE_PHOTO && resultCode == Activity.RESULT_OK) {
      new AddPhotoTask().execute(this.photosUrl);
    } else {
      Toast.makeText(this.getActivity(),
          "An error occurred while capturing the photo",
          Toast.LENGTH_SHORT).show();
    }
  }


  //***************************************
  // Helper methods
  //***************************************

  private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {
      // Create the File where the photo should go
      File photoFile = null;
      try {
        photoFile = createImageFile();
      } catch (IOException ex) {
        // Error occurred while creating the File
      }
      // Continue only if the File was successfully created
      if (photoFile != null) {
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
        startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
      }
    }
  }

  private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
    File image = File.createTempFile(imageFileName, ".jpg", storageDir);
    this.photoPath = image.getAbsolutePath();
    if (Log.isLoggable(TAG, Log.INFO)) {
      Log.i(TAG, "PhotoPath: " + this.photoPath);
    }
    return image;
  }


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

  public interface PhotoAddFragmentListener {

    public void onPhotoAddComplete();

  }


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

  private class AddPhotoTask extends AsyncTask<String, Void, Boolean> {

    private Item item;

    File photoFile = new File(photoPath);

    @Override
    protected void onPreExecute() {
      if (photoFile.exists()) {
        String name = photoFile.getName();
        String imageDataString = null;
        try {
          imageDataString = Base64.encodeFromFile(photoFile.getAbsolutePath());
        } catch (IOException e) {
          // TODO: handle error
        }
        this.item = new Item(name, imageDataString);
      }
    }

    @Override
    protected Boolean doInBackground(String... params) {
      try {
        final String url = params[0];
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.postForLocation(url, this.item);
        return true;
      } catch (Exception e) {
        Log.e(TAG, e.getMessage(), e);
        return false;
      }
    }

    @Override
    protected void onPostExecute(Boolean success) {
      photoFile.delete();
      if (photoAddFragmentListener != null) {
        photoAddFragmentListener.onPhotoAddComplete();
      }
    }

  }

}

Java Source Code List

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