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README
Glide Bitmap Pool
About Glide Bitmap Pool
Glide Bitmap Pool is a memory management library for reusing the bitmap memory. As it reuses bitmap memory , so no more GC calling again and again , hence smooth running application. It uses inBitmap while decoding the bitmap on the supported android versions. All the version use-cases has been handled to optimize it better.
- Glide , Fresco and Fast Android Networking uses Bitmap Pool Concept to load images efficiently.
Why use this library ?
An Image heavy Application decodes many images , so there will be continuous allocation and deallocation of memory in application , and that results in very frequent calling of GC(Garbage Collector). And finally because of very frequent calling of GC , the application UI freezes. Use Bitmap pool to avoid continuous allocation and deallocation of memory in application and reduce GC overhead that will result in smooth running application. Suppose we have to load few bitmap in Android Application. When we load bitmapOne , it will allocate the memory for bitmapOne. Then if we don’t need bitmapOne , do not recycle bitmap (as if you recycle, it will make GC to be called) , so use this bitmapOne as an inBitmap for bitmapTwo so that , the same memory can be reused for bitmapTwo. In this way , we can avoid continuous allocation and deallocation of memory in application and reduce GC overhead. But the problem is that there are few restrictions as android version less than Honeycomb does not supports it , few android version less than Kitkat only when we use inSampleSize = 1 , above that it supports completely and few other issues. So , all these types of cases are handled in this library
GET RID OF : GC_FOR_ALLOC freed 1568K, 23% free 37664K/48844K, paused 141ms, total 143ms - (whenever you see this log , your application is lagging)
Requirements
Glide Bitmap Pool can be included in any Android or Java application.
Glide Bitmap Pool supports Android 2.3 (Gingerbread) and later.
Using Glide Bitmap Pool in your application
Add this in your build.gradle
compile 'com.amitshekhar.android:glide-bitmap-pool:0.0.1'
Then initialize it in onCreate() Method of application class, :
GlideBitmapPool.initialize(10 * 1024 * 1024); // 10mb max memory size
Decoding the bitmap from file path
Bitmap bitmap = GlideBitmapFactory.decodeFile(filePath);
Decoding the bitmap from resources
Bitmap bitmap = GlideBitmapFactory.decodeResource(getResources(), R.drawable.testImage);
Decoding the down sample bitmap
Bitmap bitmap = GlideBitmapFactory.decodeFile(filePath,100,100);
Making the bitmap available for recycle or reuse
GlideBitmapPool.putBitmap(bitmap);
Getting the empty bitmap from the pool
Bitmap bitmap = GlideBitmapPool.getBitmap(width, height, config);
Clearing or Trimming Memory
GlideBitmapPool.clearMemory();
GlideBitmapPool.trimMemory(level);
Migrating to Glide Bitmap Pool
// ------ decoding -------
// old code
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test1);
// new code
Bitmap bitmap = GlideBitmapFactory.decodeResource(getResources(), R.drawable.test1);
// ------ recycling -------
// old code
bitmap.recycle();
// new code
GlideBitmapPool.putBitmap(bitmap);
// ------ creating a bitmap -------
// old code
Bitmap bitmap = Bitmap.create(width, height, config);
// new code
Bitmap bitmap = GlideBitmapPool.getBitmap(width, height, config);
Important
// Do not use bitmap.recycle();
// use GlideBitmapPool.putBitmap(bitmap); as it will put bitmap in the pool for further reuse.
// Do not use Bitmap.create(width, height, config);
// use GlideBitmapPool.getBitmap(width, height, config); as it returns bitmap from the pool that can be reused.
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Credits and references
- Glide - As it uses the same bitmap pool that is used by Glide
- Managing Bitmap Memory
- Loading Large Bitmaps Efficiently
TODO
- More Optimization with further updates.
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License
Copyright (C) 2016 Amit Shekhar
Copyright (C) 2011 Android Open Source Project
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.
Contributing to Glide Bitmap Pool
All pull requests are welcome, make sure to follow the [contribution guidelines](CONTRIBUTING.md) when you submit pull request.
*Note that all licence references and agreements mentioned in the Glide Bitmap Pool README section above
are relevant to that project's source code only.