Content of ListView takes to much memory

Question

The ListView contains rather many items(20 or more), and each of them is an ImageView with a bitmap source. These bitmaps are not compressed and have size about 640x480. When the ListView is just loaded, it takes a few memory, but if I'll scroll it then the error "Memory exceed VM budjet" may happen. When I replace the fragment with another fragment, the ListView is still hanging in memory. How can I clear the ram/ListView cache?

Update :

I use a SimpleCursorAdapter with a ViewBinder:

    SimpleCursorAdapter.ViewBinder viewBinder = new SimpleCursorAdapter.ViewBinder() {
        public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
            if (columnIndex == 0) {
                TextView tv1 = (TextView) view;
                if (cursor.getInt(4) == 0)
                    tv1.setTextColor(Color.GRAY);
                else
                    tv1.setTextColor(Color.parseColor("#191919"));
                tv1.setText(cursor.getString(columnIndex));
            }
            if (columnIndex == 3) {
                TextView tv1 = (TextView) view;
                tv1.setText(cursor.getString(columnIndex));
            }
            if (columnIndex == 2) {
                final ImageView image = (ImageView) view;
                Bitmap cachedImage = null;
                try {
                    cachedImage = imageThreadLoader.loadImage(cursor.getString(columnIndex), new ImageThreadLoader.ImageLoadedListener() {
                        public void imageLoaded(Bitmap imageBitmap) {
                            image.setImageBitmap((Bitmap) new SoftReference(imageBitmap).get());
                        }
                    });
                } catch (MalformedURLException mue) {
                    Log.e("Feeds fragment", "Can't load image");
                }
                if (cachedImage != null) {
                    image.setImageBitmap(cachedImage);
                } else image.setImageDrawable(getResources().getDrawable(R.drawable.icon));
            }

Images load in a separate thread.

I mean listview by default recycle views for efficient memory usage, if you can post your getview method that will make things more clear — ingsaurabh, Sep 01 '11 at 07:23

score 3 · Answer 1 · answered Sep 01 '11 at 07:43

3

I recommend you to watch the Google IO presentation about ListViews. It contains memory saving techniques and it helped me to understand the logics of the ListViews.

answered Sep 01 '11 at 07:43

naturlecso

196
1
7

score 2 · Answer 2 · answered Sep 01 '11 at 07:27

build the listview like this make your custom adapter and set it to the listview

public class InteractiveArrayAdapter extends ArrayAdapter<Model> {

    private final List<Model> list;
    private final Activity context;

    public InteractiveArrayAdapter(Activity context, List<Model> list) {
        super(context, R.layout.main, list);
        this.context = context;
        this.list = list;
    }

    static class ViewHolder {
        protected TextView text;
        protected CheckBox checkbox;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = null;
        if (convertView == null) {
            LayoutInflater inflator = context.getLayoutInflater();
            view = inflator.inflate(R.layout.main, null);
            final ViewHolder viewHolder = new ViewHolder();
            viewHolder.text = (TextView) view.findViewById(R.id.listitem_text);
            viewHolder.checkbox = (CheckBox) view.findViewById(R.id.checkBox1);
            viewHolder.checkbox
                    .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                        public void onCheckedChanged(CompoundButton buttonView,
                                boolean isChecked) {
                            Model element = (Model) viewHolder.checkbox
                                    .getTag();
                            element.setSelected(buttonView.isChecked());

                        }
                    });
            view.setTag(viewHolder);
            viewHolder.checkbox.setTag(list.get(position));
        } else {
            view = convertView;
            ((ViewHolder) view.getTag()).checkbox.setTag(list.get(position));
        }
        ViewHolder holder = (ViewHolder) view.getTag();
        holder.text.setText(list.get(position).getName());
        holder.checkbox.setChecked(list.get(position).isSelected());
        return view;
    }
}

try this way,and your unnecessary view will be recycled and the excecution will be faster and hope u will get rid of the error

If I use your, I'll have to put bitmap's list in adapter's constructor, and it'll be storing in ram for all the lifeperiod of fragment, but I want to load the image in memory from external storage when I see the necessary list item, and unload bitmap when it disappear(when I scroll list) — RChugunov, Sep 01 '11 at 08:22
sorry i havent done anything like that till yet..but i will give it a try..and let you know if i found any way.. — MKJParekh, Sep 01 '11 at 08:28

Content of ListView takes to much memory

2 Answers2