com.lark.http.cache.BitmapImageCache.java Source code

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Here is the source code for com.lark.http.cache.BitmapImageCache.java

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/*
 *
 * 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.lark.http.cache;

import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.support.v4.util.LruCache;
import android.text.TextUtils;

import com.android.volley.toolbox.ImageLoader.ImageCache;
import com.lark.http.SDKVersionUtil;

/**
 * using LruCache for internet image dowloading
 * @author YangHaibo
 *
 */
public class BitmapImageCache implements ImageCache {
    private LruCache<String, Bitmap> mMemoryCache;
    private static final float DEFAULT_MEM_PERCENT = 0.25f;

    private BitmapImageCache() {
    }

    private BitmapImageCache(int memCacheSize) {
        init(memCacheSize);
    }

    private void init(int memCacheSize) {
        mMemoryCache = new LruCache<String, Bitmap>(memCacheSize) {
            @Override
            protected int sizeOf(String key, Bitmap bitmap) {
                final int bitmapSize = getBitmapSize(bitmap) / 1024;
                return bitmapSize == 0 ? 1 : bitmapSize;
            }

            @Override
            protected void entryRemoved(boolean evicted, String key, Bitmap oldValue, Bitmap newValue) {
                super.entryRemoved(evicted, key, oldValue, newValue);
            }
        };
    }

    @SuppressLint("NewApi")
    public static int getBitmapSize(Bitmap bitmap) {
        if (SDKVersionUtil.hasKitKat()) {
            return bitmap.getAllocationByteCount();
        }

        if (SDKVersionUtil.hasHoneycombMR1()) {
            return bitmap.getByteCount();
        }
        return bitmap.getRowBytes() * bitmap.getHeight();
    }

    @Override
    public Bitmap getBitmap(String url) {
        if (!TextUtils.isEmpty(url)) {
            synchronized (mMemoryCache) {
                final Bitmap map = mMemoryCache.get(url);
                if (map != null) {
                    return map;
                }
            }
        }
        return null;
    }

    @Override
    public void putBitmap(String url, Bitmap bitmap) {
        if (TextUtils.isEmpty(url) || bitmap == null) {
            return;
        }
        synchronized (mMemoryCache) {
            mMemoryCache.put(url, bitmap);
        }
    }

    public void clearCache() {
        if (mMemoryCache != null) {
            mMemoryCache.evictAll();
        }
    }

    public static int calculateMemCacheSize(float percent) {
        if (percent < 0.05f || percent > 0.8f) {
            throw new IllegalArgumentException(
                    "setMemCacheSizePercent - percent must be " + "between 0.05 and 0.8 (inclusive)");
        }
        return Math.round(percent * Runtime.getRuntime().maxMemory() / 1024);
    }

    public static BitmapImageCache getInstance() {
        BitmapImageCache bitmapImageCache = null;
        if (bitmapImageCache == null) {
            bitmapImageCache = new BitmapImageCache(calculateMemCacheSize(DEFAULT_MEM_PERCENT));
        }
        return bitmapImageCache;
    }
}