Android Out of memory error in Imageview

Question

I need to set a background image in my app. I have used an imageview and am trying to set its background programatically. I am getting the 'out of memory error'. I read other posts on SO and have changed my code to get image only as per the screen height and width. I have tried a few other things but still keep getting the same error. Kindly help.

Thanks.

    @Override
protected void onResume() {
    super.onResume();

    ivBackground.setImageBitmap(decodeSampledBitmapFromResource(getResources(), R.drawable.themes, getDisplayWidth(), getDisplayHeight()));
    ivBackground.setScaleType(ScaleType.CENTER_CROP);
}

public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
        int reqWidth, int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
}



public int getDisplayHeight(){
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    return dm.heightPixels;
}

public int getDisplayWidth(){
    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    return dm.widthPixels;
}



public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        final int halfHeight = height / 2;
        final int halfWidth = width / 2;

        // Calculate the largest inSampleSize value that is a power of 2 and keeps both
        // height and width larger than the requested height and width.
        while ((halfHeight / inSampleSize) > reqHeight
                && (halfWidth / inSampleSize) > reqWidth) {
            inSampleSize *= 2;
        }
    }
    return inSampleSize;
}

xml layout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >
    <ImageView android:id="@+id/ivBackground"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"/>

    <android.support.v4.view.ViewPager

        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainPage"
         />

Answer 1

i don't have "reputation" to post a comment so posting an answer. here is what i think is happening. activity is starting first time so imageview don't have anything to display.

• onResume a bitmap is binded to imageview
• onPause activity pauses
• OnResume again now here's tricky part. as activity is not getting destroyed(i'm assuming, you have to check) that bitmap is still bound to imageView. and when this line is called "ivBackground.setImageBitmap" it will call "decodeSampledBitmapFromResource" method to get a bitmap according to screen size. which eventually create a bitmap that is reduced to screen dimension , ergo there will be 2 bitmaps loaded for brief amount of time in memory. and as you are loading bitmap for full screen size that can take 20-25 mb per bitmap in memory . hence this may create "out of memory" situation.

solution : setting setImageBitmap null in onPause method worked for me .

Answer 2

I solved this error by doing this - in my case, the image dimension was way too big for my phone so I had to resize it dynamically before I could load it into the imageview.

This is what I did:

STEP 1:

I found out what my screen resolution is by:How do I get the ScreenSize programmatically in android

    WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
    Display display = wm.getDefaultDisplay();
    DisplayMetrics metrics = new DisplayMetrics();
    display.getMetrics(metrics);
    int width = metrics.widthPixels;
    int height = metrics.heightPixels;

STEP 2:

I then dynamically resize the bitmap:

    Bitmap bm = drawableToBitmap(ContextCompat.getDrawable(this, R.drawable.cloud_plane));
    Bitmap bitmapsimplesize = Bitmap.createScaledBitmap(bm, width, height, true);
    bm.recycle();
    background.setImageBitmap(bitmapsimplesize);

The drawableToBitmap method can be found here:How to convert a Drawable to a Bitmap?

public static Bitmap drawableToBitmap (Drawable drawable) {
    Bitmap bitmap = null;

    if (drawable instanceof BitmapDrawable) {
        BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
        if(bitmapDrawable.getBitmap() != null) {
            return bitmapDrawable.getBitmap();
        }
    }

    if(drawable.getIntrinsicWidth() <= 0 || drawable.getIntrinsicHeight() <= 0) {
        bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888); // Single color bitmap will be created of 1x1 pixel
    } else {
        bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
    }

    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);
    return bitmap;
}

Answer 3

Just put largeHeap="true" in application tag (AndroidManifest.xml)

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:largeHeap="true"
    android:theme="@android:style/Theme.Black.NoTitleBar" >

I think it will help you.
Thank you.

Answer 4

Add below code on Activity :

  @Override
        public void onDestroy(){

                bitmap.recycle();

            System.gc();
            super.onDestroy();

        }

Answer 5

I added the following to my above code and got it to work. Its more or less related to what other individuals have mentioned here. So, thanks everyone for the help.

@Override
protected void onDestroy() {
    System.gc();
    super.onDestroy();
    ivBackground.setImageBitmap(null);
}