CODEWITHSUNDEEP
androidandroid-dialog
Vitali Mogilevsky
Vitali Mogilevsky

Reputation: 720

Memory used by ImageView is never released

While building a Dialog which loads content view layout (setContentView) I have noticed a weird thing: The loaded layout has an ImageView with background of this Dialog:

<ImageView android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:src="@drawable/preloader_bg_small"
            android:id="@+id/background_img"
        />

Each time the dialog shows (in different activities) it drains memory (30mb) the image itself is 290k jpg loaded from local resource and NEVER gets released

I have tried to load the image programmatically:

((ImageView)dialog.findViewById(R.id.background_img)).setImageResource(R.drawable.preloader_bg_small);

and then unloading it before the dismiss on the dialog

 ((ImageView)dialog.findViewById(R.id.background_img)).setImageDrawable(null);

But then the memory gets released only after the activity is closed and not immediately.

Is there a way releasing the memory? Why is ImageView behaves this way?

Thanks for help!

Upvotes: 1

Views: 3264

Answers (4)

Buddy
Buddy

Reputation: 2114

An exemplary way to recycle a BitmapDrawable resource of an ImageView is using the following function :

protected void recycleDefaultImage() {
    Drawable imageDrawable = imageView.getDrawable();
    imageView.setImageDrawable(null); //this is necessary to prevent getting Canvas: can not draw recycled bitmap exception

    if (imageDrawable!=null && imageDrawable instanceof BitmapDrawable) {
        BitmapDrawable bitmapDrawable = ((BitmapDrawable) imageDrawable);

        if (!bitmapDrawable.getBitmap().isRecycled()) {
            bitmapDrawable.getBitmap().recycle();
        }
    }
}

Upvotes: 0

Vitali Mogilevsky
Vitali Mogilevsky

Reputation: 720

Although its still weird solved in following way:

loading image by setting drawable and not resource directly:

((ImageView)dialog.findViewById(R.id.background_img)).setImageDrawable(getResources().getDrawable(R.drawable.preloader_bg_small));

and releasing it from memory by setting drawable to null

ImageView background_image = ((ImageView) dialog.findViewById(R.id.background_img));
            background_image.setImageDrawable(null);

Upvotes: 1

QArea
QArea

Reputation: 4981

Try ((ImageView)dialog.findViewById(R.id.background_img)).setImageResource(android.R.color.transparent); But it doesn't seem the image view problem. Your activity keeps link to image. Please give more code.

Upvotes: 0

David Wasser
David Wasser

Reputation: 95578

Android manages Dialogs for you as an optimization. Unfortunately, it doesn't remove Dialogs after they have been used. It keeps them around hoping that you will use them again. In general, this isn't an advantage to your application. But that's the way it works.

What you need to do is to remove (delete) your Dialogs after they have been dismissed. You do this by calling removeDialog() when you don't need your Dialog any more.

Upvotes: 0

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