位图和 Android 堆
我的应用程序使用一些带有 SurfaceView 的位图。对于经常调用的位图，我将它们存储为类字段，即当创建 SurfaceView 实例的扩展时，我有
bitmap_puppyicon = BitmapFactory.decodeResource(getResources(),R.drawable.puppy);
其中 bitmap_puppyicon 是我的扩展 SurfaceView 的类变量。我认为这意味着它在堆上。
对于使用一次或两次左右的位图，我在 onDraw() 方法中动态创建它们。
我检查了 DDMS 中的堆，觉得我可以将更多位图存储为类变量，而不是在 onDraw() 中创建它们。
令我惊讶的是，执行此操作后堆大小下降了几个百分点。我是否误解了什么？为什么存储的位图越多，堆就会变得越小？
My app uses some bitmaps with a SurfaceView. For bitmaps that a recalled often I stored them as class fields, i.e. when my extension of SurfaceView instance is created I have
bitmap_puppyicon = BitmapFactory.decodeResource(getResources(),R.drawable.puppy);
Where bitmap_puppyicon is a class variable of my extended SurfaceView. WHich means, I think, it is on the heap.
For bitmaps that are used once or twice or so, I created them on the fly in the onDraw() method.
I checked out the heap in DDMS and felt I could afford to store more bitmaps as class variables instead of creating them in onDraw().
To my surprise the heap size went down a few percentage points after doing this. Have I misunderstood something? Why would the heap get smaller with more bitmaps stored?
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它在底层使用skia，并且堆不是位图所在的地方，在堆中您仅具有指向位图的链接
It use skia under the hood, and heap is not the place where bitmaps live, In the heap you have links to bitmaps only