How to use

trimMemory

method

in

com.bumptech.glide.load.engine.cache.MemoryCache

/**
 * Clears some memory with the exact amount depending on the given level.
 *
 * @see android.content.ComponentCallbacks2#onTrimMemory(int)
 */
public void trimMemory(int level) {
 // Engine asserts this anyway when removing resources, fail faster and consistently
 Util.assertMainThread();
 // memory cache needs to be trimmed before bitmap pool to trim re-pooled Bitmaps too. See #687.
 memoryCache.trimMemory(level);
 bitmapPool.trimMemory(level);
 arrayPool.trimMemory(level);
}

@Test
public void testTrimMemory() {
 Glide glide =
   new GlideBuilder()
     .setBitmapPool(bitmapPool)
     .setMemoryCache(memoryCache)
     .build(context);
 final int level = 123;
 glide.trimMemory(level);
 verify(bitmapPool).trimMemory(eq(level));
 verify(memoryCache).trimMemory(eq(level));
}

/**
 * Clears some memory with the exact amount depending on the given level.
 *
 * @see android.content.ComponentCallbacks2#onTrimMemory(int)
 */
public void trimMemory(int level) {
  // Engine asserts this anyway when removing resources, fail faster and consistently
  Util.assertMainThread();
  // memory cache needs to be trimmed before bitmap pool to trim re-pooled Bitmaps too. See #687.
  memoryCache.trimMemory(level);
  bitmapPool.trimMemory(level);
}

@Test
public void testPreventEviction() {
 final MemoryCache cache = new LruResourceCache(100);
 final Resource<?> first = getResource(30);
 final Key firstKey = new MockKey();
 cache.put(firstKey, first);
 Resource<?> second = getResource(30);
 Key secondKey = new MockKey();
 cache.put(secondKey, second);
 Resource<?> third = getResource(30);
 Key thirdKey = new MockKey();
 cache.put(thirdKey, third);
 cache.setResourceRemovedListener(new ResourceRemovedListener() {
  @Override
  public void onResourceRemoved(@NonNull Resource<?> removed) {
   if (removed == first) {
    cache.put(firstKey, first);
   }
  }
 });
 // trims from 100 to 50, having 30+30+30 items, it should trim to 1 item
 cache.trimMemory(ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN);
 // and that 1 item must be first, because it's forced to return to cache in the listener
 @SuppressWarnings("unchecked")
 LruCache<Key, Resource<?>> lruCache = (LruCache<Key, Resource<?>>) cache;
 assertTrue(lruCache.contains(firstKey));
 assertFalse(lruCache.contains(secondKey));
 assertFalse(lruCache.contains(thirdKey));
}

/**
 * Clears some memory with the exact amount depending on the given level.
 *
 * @see android.content.ComponentCallbacks2#onTrimMemory(int)
 */
public void trimMemory(int level) {
 // Engine asserts this anyway when removing resources, fail faster and consistently
 Util.assertMainThread();
 // memory cache needs to be trimmed before bitmap pool to trim re-pooled Bitmaps too. See #687.
 memoryCache.trimMemory(level);
 bitmapPool.trimMemory(level);
 arrayPool.trimMemory(level);
}