com.bydavy.card.receipts.fragments.PreviewPictureFragment.java Source code

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Here is the source code for com.bydavy.card.receipts.fragments.PreviewPictureFragment.java

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/*
 * Copyright (C) 2012 Davy Leggieri
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
package com.bydavy.card.receipts.fragments;

import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.bydavy.card.receipts.R;
import com.bydavy.card.receipts.fragments.PicturePickerDialogFragment.OnPictureChoseListener;
import com.bydavy.card.receipts.providers.Receipts;
import com.bydavy.card.receipts.providers.access.ReceiptProviderAccess;
import com.bydavy.card.receipts.ui.BitmapWorkerTask;
import com.bydavy.card.receipts.utils.LogHelper;
import com.bydavy.card.receipts.utils.LogHelper.ErrorID;

public class PreviewPictureFragment extends StateSherlockFragment {
    /** Change first statement of if condition to enable class debug **/
    private static final boolean DEBUG = LogHelper.DEBUG ? false : LogHelper.DEFAULT_DEBUG;
    private static final String DEBUG_PREFIX = PreviewPictureFragment.class.getName();

    private static final String ARG_RECEIPT_ID = "receiptId";
    private static final int CURSOR_LOADER_RECEIPT = 0;
    private static final String INSERT_PICTURE_DIALOG_FRAGMENT_TAG = "insertPictureDialog";

    private final MyReceiptLoader mLoaderCallBack = new MyReceiptLoader();
    private ImageView mPicture;
    private String mPicturePath;
    private BitmapWorkerTask mViewPictureWorker;

    public static PreviewPictureFragment newInstance(long receiptId) {
        if (receiptId <= 0) {
            throw new IllegalArgumentException("receipt id must be > 0");
        }

        final PreviewPictureFragment f = new PreviewPictureFragment();

        final Bundle args = new Bundle();
        args.putLong(ARG_RECEIPT_ID, receiptId);
        f.setArguments(args);

        return f;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final View v = inflater.inflate(R.layout.fragment_preview_picture, null);
        mPicture = (ImageView) v;

        return v;
    }

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

        // Load the receipt in a dedicated thread
        final Bundle b = mLoaderCallBack.createBundle(getReceiptId());
        getLoaderManager().initLoader(CURSOR_LOADER_RECEIPT, b, mLoaderCallBack);
    }

    /*
     * Retrieve the receipt id currently displayed.
     * 
     * This method is thread safe and can be invoked right after fragments
     * instantiation
     * 
     * @return shown receipt id or -1 if no receipt id was set
     */
    public long getReceiptId() {
        final Bundle args = getArguments();
        if (args != null) {
            return args.getLong(ARG_RECEIPT_ID);
        }
        return -1;
    }

    /*
     * Must be executed by the UIThread
     */
    private void updateView(Cursor c) {
        final boolean hasReceipt = ((c != null) && c.moveToFirst());

        if (hasReceipt) {
            final int picturePathColumnIndex = c.getColumnIndex(Receipts.COLUMN_NAME_PICTURE_PATH);

            mPicturePath = c.getString(picturePathColumnIndex);

            final Display display = getActivity().getWindowManager().getDefaultDisplay();

            // Cancel picture task
            if (mViewPictureWorker != null) {
                mViewPictureWorker.cancel(true);
            }
            mViewPictureWorker = new BitmapWorkerTask(mPicture, display.getWidth(), display.getHeight()) {
                @Override
                protected void onPostExecute(Bitmap bitmap) {
                    super.onPostExecute(bitmap);
                    if (getState() != StateFragmentListener.STATE_COMPLETED) {
                        setState(StateFragmentListener.STATE_COMPLETED);
                    }
                }
            };
            mViewPictureWorker.execute(mPicturePath);
        }
    }

    private final class MyReceiptLoader implements LoaderCallbacks<Cursor> {
        private static final String BUNDLE_RECEIPT_ID = "receiptId";

        /* Not possible to create a static method =0/ */
        public Bundle createBundle(long receiptId) {
            final Bundle bundle = new Bundle();
            bundle.putLong(BUNDLE_RECEIPT_ID, receiptId);
            return bundle;
        }

        /* Dedicated Thread */
        @Override
        public Loader<Cursor> onCreateLoader(int id, Bundle bundle) {
            switch (id) {
            case CURSOR_LOADER_RECEIPT: {
                if (bundle == null) {
                    throw new IllegalArgumentException("Must set a bundle");
                }

                final long receiptId = bundle.getLong(BUNDLE_RECEIPT_ID);
                if (receiptId <= 0L) {
                    throw new IllegalArgumentException("Must set " + BUNDLE_RECEIPT_ID);
                }

                final Uri uriSingleReceipt = Uri.withAppendedPath(Receipts.CONTENT_URI, String.valueOf(receiptId));
                return new CursorLoader(getActivity(), uriSingleReceipt, null, null, null, null);
            }
            default:
                throw new IllegalArgumentException("The cursor loader " + id + " doesn't exist");
            }
        }

        /* UI Thread */
        @Override
        public void onLoadFinished(Loader<Cursor> cl, final Cursor cursor) {
            updateView(cursor);
        }

        /* UI Thread */
        @Override
        public void onLoaderReset(Loader<Cursor> cl) {
        }
    }

    public void delete() {
        ReceiptProviderAccess.updatePicture(getActivity(), getReceiptId(), null, mPicturePath, false);
    }

    public void edit() {
        final FragmentTransaction ft = getFragmentManager().beginTransaction();
        final Fragment prev = getFragmentManager().findFragmentByTag(INSERT_PICTURE_DIALOG_FRAGMENT_TAG);
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);

        final PicturePickerDialogFragment dialog = PicturePickerDialogFragment.newInstance();
        dialog.show(ft, INSERT_PICTURE_DIALOG_FRAGMENT_TAG);
    }

    public void onPictureChose(String path, int from) {
        if ((from != OnPictureChoseListener.GALLERY) && (from != OnPictureChoseListener.TEMPORARY)) {
            LogHelper.e(ErrorID.IMPLEMENTATION, "A new value was added to " + OnPictureChoseListener.class.getName()
                    + " from, and it's not handled.", null);
            return;
        }
        mPicturePath = ReceiptProviderAccess.updatePicture(getActivity(), getReceiptId(), path, mPicturePath,
                from != OnPictureChoseListener.GALLERY);
    }
}