Android Open Source - rss Async Load Image

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License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * 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 3 of the License, or
 * (at your option) any later version.//from ww  w  . j ava2s.  c om
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

package com.poloure.simplerss;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.view.View;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.ref.WeakReference;

public
class AsyncLoadImage extends AsyncTask<String, Void, Bitmap>
{
    private final WeakReference<ViewFeedItem> m_view;
    private final long m_viewTag;
    private final Context m_context;

    private
    AsyncLoadImage(ViewFeedItem view, long viewTag)
    {
        m_context = view.getContext();
        m_view = new WeakReference<ViewFeedItem>(view);
        m_viewTag = viewTag;
    }

    public static
    void newInstance(ViewFeedItem view, String imageName, long viewTag)
    {
        AsyncTask<String, Void, Bitmap> task = new AsyncLoadImage(view, viewTag);
        task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, imageName);
    }

    @Override
    protected
    Bitmap doInBackground(String... params)
    {
        View viewReference = m_view.get();
        if(null == viewReference)
        {
            cancel(true);
            return null;
        }

        try
        {
            FileInputStream in = m_context.openFileInput(params[0]);
            try
            {
                return BitmapFactory.decodeStream(in);
            }
            finally
            {
                if(null != in)
                {
                    in.close();
                }
            }
        }
        catch(FileNotFoundException ignored)
        {
            return null;
        }
        catch(IOException ignored)
        {
            return null;
        }
    }

    @Override
    protected
    void onPostExecute(Bitmap result)
    {
        if(isCancelled())
        {
            return;
        }

        ViewFeedItem view = m_view.get();
        if(null != view)
        {
            Object viewTag = view.getTag();
            if(viewTag.equals(m_viewTag) && null != result)
            {
                view.setBitmap(result);
            }
        }
    }
}

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