java.lang.OutOfMemoryError loading Images in Codename One

Question

This question refers to Codename One only.

I have a Form with a Tabs and each tab can contain an arbitrary number of images (taken from the Gallery).

Result: after few images (eight images from the gallery), on my Android device I get:

java.lang.OutOfMemoryError: Failed to allocate a 5683356 byte allocation with 1845080 free bytes and 1801KB until OOM
        at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
        at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
        at android.graphics.BitmapFactory.decodeStreamInternal(BitmapFactory.java:737)
        at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:703)
        at com.codename1.impl.android.c.b(AndroidImplementation.java:2037)
        at com.codename1.r.z.a(Image.java:531)
        at cool.teammate.apps.frontend.b.e.a$1.a(BasePageForm.java:208)
        at com.codename1.r.l.b.a(EventDispatcher.java:349)
        at com.codename1.impl.android.c.a(AndroidImplementation.java:7336)
        at com.codename1.impl.android.CodenameOneActivity$6.run(CodenameOneActivity.java:527)
        at com.codename1.r.r.n(Display.java:1298)
        at com.codename1.r.r.l(Display.java:1242)
        at com.codename1.r.r.k(Display.java:1130)
        at com.codename1.r.aq.run(RunnableWrapper.java:120)
        at com.codename1.impl.b$1.run(CodenameOneThread.java:60)
        at java.lang.Thread.run(Thread.java:776)

Also iOS crashes, but I haven't the log.

Each image is scaled before showing (using the class FixedSizeButton, that I reported in this question). Any suggestion?

I guess that the dispose() method of Image can be useful, but it's written to "DO NOT CALL THIS METHOD UNLESS YOU KNOW WHAT YOU ARE DOING". Is it so problematic? For example, can it help if I dispose an Image after saving it to file and/or after scaling?

I also guess that System.gc() can be useful.

However, if few photos are so problematic... how can I make a photo gallery inside a Form without this kind of issues? Same problem to load hundreds of photo post inside an InfiniteContainer...

Note that the memory issue happens regardless if I insert the images as icon of a Button or as filled background of the Button.

Thank you for your suggestion.

Shai Almog Shai Almog · Accepted Answer · 2019-09-18T02:46:12

You don't need to call dispose() or gc() for a proper application. You're trying to load a 5mb image which I'm assuming is a 5mb JPEG. That's probably from a 9+ mega pixel camera which means the decompressed size would be roughly 9 x 4 == 36MB!

So 36 x 8 = 288mb of RAM.

    this.image = Image.createImage(this.imageWidth, this.imageHeight, 0xFFdddddd);

What's imageWidth/Height?

You might be taking a lot of RAM here...

    this.setIcon(this.image);

    EasyThread scalingThread = EasyThread.start("FixedSizeButton-ScalingImg-" + fileName);

Since you're creating multiple threads you might have all 8 images in RAM at once.

A better way is to use one image scaling thread. An even better approach is avoiding scaled altogether and using ImageIO to scale the image without loading it into RAM.

java.lang.OutOfMemoryError loading Images in Codename One

1 Answers