org.mariotaku.twidere.util.ImagePreloader.java Source code

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Here is the source code for org.mariotaku.twidere.util.ImagePreloader.java

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/*
 *             Twidere - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com>
 * 
 *  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.
 * 
 *  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 org.mariotaku.twidere.util;

import android.content.Context;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.support.v4.net.ConnectivityManagerCompat;
import android.text.TextUtils;

import com.nostra13.universalimageloader.cache.disc.DiskCache;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.io.File;

import static org.mariotaku.twidere.TwidereConstants.SHARED_PREFERENCES_NAME;
import static org.mariotaku.twidere.constant.SharedPreferenceConstants.KEY_PRELOAD_WIFI_ONLY;

/**
 * @author mariotaku
 */
public class ImagePreloader {

    public static final String LOGTAG = "ImagePreloader";

    private final SharedPreferences mPreferences;
    private final DiskCache mDiskCache;
    private final ImageLoader mImageLoader;
    private final ConnectivityManager mConnectivityManager;

    public ImagePreloader(final Context context, final ImageLoader loader) {
        mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        mPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
        mImageLoader = loader;
        mDiskCache = loader.getDiskCache();
    }

    public File getCachedImageFile(final String url) {
        if (url == null)
            return null;
        final File cache = mDiskCache.get(url);
        if (ImageValidator.isValid(ImageValidator.checkImageValidity(cache)))
            return cache;
        else {
            preloadImage(url);
        }
        return null;
    }

    public void preloadImage(final String url) {
        if (TextUtils.isEmpty(url))
            return;
        if (ConnectivityManagerCompat.isActiveNetworkMetered(mConnectivityManager)
                && mPreferences.getBoolean(KEY_PRELOAD_WIFI_ONLY, true))
            return;
        mImageLoader.loadImage(url, null);
    }

}