CODEWITHSUNDEEP
androidmemorywebview
Kiran
Kiran

Reputation: 191

Viewpager Webview memory issue

I'm using a viewpager to load around 50 webviews... All the webviews are loaded into assests and each weview has an HTML page that is accessing around 70 images each... As i swipe, my app is crashing after around 30 pages, might be cos of the webviews still keep their reference to the images in the assests folder... Is there any way to release the webviews that the Viewpager is not using at that particular time?

awesomePager.setAdapter(new AwesomePagerAdapter(this, webviewdata));

Details:

Android WebView Memory Leak when loading html file from Assets  
Failed adding to JNI local ref table (has 512 entries)
"Thread-375" prio=5 tid=15 RUNNABLE

while dynamically loading webview on viewpager

Logcat: enter image description here

Upvotes: 9

Views: 3239

Answers (3)

starkm
starkm

Reputation: 1029

Setting layer type of webview to software works.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
    webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}

But now you lose hardware acceleration and your webview may slow down.

Upvotes: 0

Ostkontentitan
Ostkontentitan

Reputation: 7010

The WebView works with the JNI and this can only hold 512 local references, try loading your content directly from web and the problem shouldn't occur.

I get this problem when I override shouldInterceptRequest(WebView view, String url) in webviewclient and hand local references from my own caching mechanism.

This might be a bug in the webview itself. At least it isn't how it should behave if you ask me.

Upvotes: 0

Vipul
Vipul

Reputation: 28093

Try to scale down bitmap.Most of the time Bitmap is a main reason we get Memory issue. Also learn about how to recycle the bitmaps. Following snippet will help you.

BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile( filename, options );
        options.inJustDecodeBounds = false;
        options.inSampleSize = 2; 

        bitmap = BitmapFactory.decodeFile( filename, options );
        if ( bitmap != null && exact ) {
            bitmap = Bitmap.createScaledBitmap( bitmap, width, height, false );
        }

Also make sure you did override following method.

@Override
public void destroyItem(View collection, int position, Object view) {
    ((ViewPager) collection).removeView((TextView) view);
}

Or you can create a function to Scale Down Bitmap

private byte[] resizeImage( byte[] input ) {

    if ( input == null ) {
        return null;
    }

    Bitmap bitmapOrg = BitmapFactory.decodeByteArray(input, 0, input.length);

    if ( bitmapOrg == null ) {
        return null;
    }

    int height = bitmapOrg.getHeight();
    int width = bitmapOrg.getWidth();
    int newHeight = 250;

    float scaleHeight = ((float) newHeight) / height;

    // creates matrix for the manipulation
    Matrix matrix = new Matrix();
    // resize the bit map
    matrix.postScale(scaleHeight, scaleHeight);

    // recreate the new Bitmap
    Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
            width, height, matrix, true);

    bitmapOrg.recycle();

    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    resizedBitmap.compress(CompressFormat.PNG, 0 /*ignored for PNG*/, bos);            

    resizedBitmap.recycle();

    return bos.toByteArray();            
}

Upvotes: 1

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