com.royclarkson.springagram.PhotoAddFragment.java Source code

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Here is the source code for com.royclarkson.springagram.PhotoAddFragment.java

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/*
 * Copyright 2014 Roy Clarkson
 *
 * 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();
            }
        }

    }

}