Android Open Source - Resonos-Android-Framework Bitmap Memory Cache

From Project

Back to project page Resonos-Android-Framework.

License

The source code is released under:

Apache License

If you think the Android project Resonos-Android-Framework listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package com.resonos.apps.library.media;
//from  w ww  .  j a  v a  2 s  .c o m
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;

import android.graphics.Bitmap;

import com.resonos.apps.library.util.M;

/**
 * Class that implements an in memory cache of bitmaps.
 * From LazyList at https://github.com/thest1/LazyList/
 */
public class BitmapMemoryCache {

  private static final String TAG = "MemoryCache";
  private Map<String, Bitmap> cache = Collections // Last argument true for LRU ordering
      .synchronizedMap(new LinkedHashMap<String, Bitmap>(10, 1.5f, true));
  private long size = 0;// current allocated size
  private long limit = 1000000;// max memory in bytes

  public BitmapMemoryCache() {
    // use 25% of available heap size
    setLimit(Runtime.getRuntime().maxMemory() / 4);
  }

  public void setLimit(long new_limit) {
    limit = new_limit;
    M.log(TAG, "MemoryCache will use up to " + limit / 1024. / 1024. + "MB");
  }

  public Bitmap get(String id) {
    if (!cache.containsKey(id))
      return null;
    return cache.get(id);
  }

  public void put(String id, Bitmap bitmap) {
    try {
      if (cache.containsKey(id))
        size -= getSizeInBytes(cache.get(id));
      cache.put(id, bitmap);
      size += getSizeInBytes(bitmap);
      checkSize();
    } catch (Throwable th) {
      th.printStackTrace();
    }
  }

  private void checkSize() {
    M.log(TAG, "cache size=" + size + " length=" + cache.size());
    if (size > limit) {
      // least recently accessed item will be the first one iterated
      Iterator<Entry<String, Bitmap>> iter = cache.entrySet().iterator();
      while (iter.hasNext()) {
        Entry<String, Bitmap> entry = iter.next();
        size -= getSizeInBytes(entry.getValue());
        iter.remove();
        if (size <= limit)
          break;
      }
      M.log(TAG, "Clean cache. New size " + cache.size());
    }
  }

  public void clear() {
    cache.clear();
  }

  long getSizeInBytes(Bitmap bitmap) {
    if (bitmap == null)
      return 0;
    return bitmap.getRowBytes() * bitmap.getHeight();
  }
}

Java Source Code List