Android loading images efficient (out of memory) [duplicate]

Answer 1

There was an answer in SO about freeing up memory manually. I couldn't find it now so I am pasting the answer I am implementing

Define the following function

    //To free up memory taken by adapterViews and others
private void unbindDrawables(View view) {
    if (view.getBackground() != null)
        view.getBackground().setCallback(null);

    if (view instanceof ImageView) {
        ImageView imageView = (ImageView) view;
        imageView.setImageBitmap(null);
    } else if (view instanceof ViewGroup) {
        ViewGroup viewGroup = (ViewGroup) view;
        for (int i = 0; i < viewGroup.getChildCount(); i++)
            unbindDrawables(viewGroup.getChildAt(i));

        if (!(view instanceof AdapterView))
            viewGroup.removeAllViews();
    }
}

then in your onDestroy method use

unbindDrawables(findViewById(R.id.view_to_unbind));
System.gc();

This has stopped my app from crashing on orientation change.

Answer 2

Best solution is use the RecyclerView in your app https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html

Answer 3

You load image thumbnail in grid view not the main image after clicking on gridview you make a request to load the main image. Store thumbnails on server also.