Bitmaps图片泄露问题

Android资源缓存管理

最新推荐文章于 2024-12-16 11:18:45 发布

iteye_15461

最新推荐文章于 2024-12-16 11:18:45 发布

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分类专栏： android 文章标签： Android Cache Blog

本文链接：https://blog.youkuaiyun.com/iteye_15461/article/details/81924724

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本文介绍了一个用于Android应用中管理图像资源的类ImageManager。该类通过缓存Bitmap和Drawable对象来减少内存占用并提高应用性能。ImageManager支持资源获取、回收及激活状态设置等功能。

class ImageManager {
    private HashMap<Integer, Bitmap> mBitmaps;
    private HashMap<Integer, Drawable> mDrawables;

    private boolean mActive = true;

    public ImageManager() {
        mBitmaps = new HashMap<Integer, Bitmap>();
        mDrawables = new HashMap<Integer, Drawable>();
    }

    // We need to share and cache resources between objects to save on memory.
    public Bitmap getBitmap(int resource) {
        if (mActive) {
            if (!mBitmaps.containsKey(resource)) {
                mBitmaps.put(resource,
                    BitmapFactory.decodeResource(MainActivity.getContext().getResources(), resource));
            }
            return mBitmaps.get(resource);
        }
        return null;
    }

    public Drawable getDrawable(int resource) {
        if (mActive) {
            if (!mDrawables.containsKey(resource)) {
                mDrawables.put(resource, mGame.getView().getResources().getDrawable(resource));
            }
            return mDrawables.get(resource);
        }
        return null;
    }

    public void recycleBitmaps() {
        Iterator itr = mBitmaps.entrySet().iterator();
        while (itr.hasNext()) {
            Map.Entry e = (Map.Entry)itr.next();
            ((Bitmap) e.getValue()).recycle();
        }
        mBitmaps.clear();
    }

    public ImageManager setActive(boolean b) {
        mActive = b;
        return this;
    }

    public boolean isActive() {
        return mActive;
    }
}

http://blog.pseudoblue.com/2010/08/15/android-bitmaps-and-memory-leaks/