CODEWITHSUNDEEP
androidperformance
durbnpoisn
durbnpoisn

Reputation: 4659

Using PNGs for Animation on Android

I've heard that using a list of Bitmaps for animation is a bad idea. But I had not run into a situation to prove that was true until now.

The code I have works great. But only on the emulator, or on my phone running Android 6. Anything lower than that and I get an Out of Memory before it finishes initializing.

This is how I'm loading the images in:

public static Image[] flameIs = new Image[300];


for (int i=0;i<300;i++) {
    if (i>=10) framePref="000";
    if (i>=100) framePref="00";
    Assets.flameIs[i] = g.newImage("frames/lighter_" + framePref +i+ ".png", ImageFormat.RGB565);
}

So it's like 300 PNGs, 8bit, about 12k each in size. We're talking about less than 4MB worth of images.

All the app does later is run these frames in a loop forever.

Is there a way to avoid that "out of memory"?

Upvotes: 1

Views: 265

Answers (2)

Christian Navarro
Christian Navarro

Reputation: 380

Instead of creating a 300 frame animation, why not just convert them into a GIF and use something like Glide to render it? (or even a webview if you don't want to add a new library to your project)

It'll give you better control and portability across platforms.

With Glide, it will look something like this:

ImageView imageView = (ImageView) findViewById(R.id.imageView); GlideDrawableImageViewTarget imageViewTarget = new GlideDrawableImageViewTarget(imageView); Glide.with(this).load(R.raw.sample_gif).into(imageViewTarget);

Upvotes: 0

Gauthier
Gauthier

Reputation: 4978

300 Bitmaps of 459x620 loaded as RGB_565 means that you take 300 * 459*620 * 2 = 171 MB of memory.

Looking at https://stackoverflow.com/a/9940415/3413324 which sum up the heap size for popular devices, we can see that your Bitmaps might exceeds the limit even for recent devices.

What you can do is :

  • Reduce the size of your Bitmaps so that they each need less space in memory

  • Reduce the number of Bitmaps you use for your animation, thus reducing the memory footprint

  • Use a GIF that you can load with a library. You can have then direct control of the size of a unique GIF file

  • If possible create your animation programatically

Upvotes: 2

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