Android gridview maintain the state when changes orientation but need to update views

Question

Am having a gridview which sets the views based on the gridview size and the col width, everything fine when we start but when i change the orientation, the views are recreated and the check boxes which are checked are refreshed, which i dont want. I need to maintain the scrolled sate as well the check box state.

Here is my code in getview:

public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if (convertView == null) {
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.galleryitem, null);
                holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
                holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);

                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            ImageItem item = images.get(position);
            holder.checkbox.setId(position);
            holder.imageview.setId(position);
            holder.checkbox.setOnClickListener(new OnClickListener() {

                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    CheckBox cb = (CheckBox) v;
                    int id = cb.getId();
                    if (images.get(id).selection) {
                        cb.setChecked(false);
                        images.get(id).selection = false;
                    } else {
                        cb.setChecked(true);
                        images.get(id).selection = true;
                    }
                }
            });
            holder.imageview.setOnClickListener(new OnClickListener() {

                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    int id = v.getId();
                    ImageItem item = images.get(id);
                    Intent intent = new Intent();
                    intent.setAction(Intent.ACTION_VIEW);
                    final String[] columns = { MediaStore.Images.Media.DATA };
                    Cursor imagecursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                            columns, MediaStore.Images.Media._ID + " = " + item.id, null, MediaStore.Images.Media._ID);
                    if (imagecursor != null && imagecursor.getCount() > 0) {
                        imagecursor.moveToPosition(0);
                        String path = imagecursor.getString(imagecursor
                                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
                        File file = new File(path);
                        imagecursor.close();
                        intent.setDataAndType(Uri.fromFile(file), "image/*");
                        startActivityForResult(intent, VIEW_IMAGE);
                    }
                }
            });
            // holder.imageview.setImageBitmap(item.img);
            holder.imageview.setLayoutParams(mImageViewLayoutParams);

            // Check the height matches our calculated column width
            if (holder.imageview.getLayoutParams().height != mItemHeight) {
                holder.imageview.setLayoutParams(mImageViewLayoutParams);
            }
            bitmapFromId.DisplayImage(item.id, holder.imageview);
            // holder.imageview.setImageBitmap(item.img);
            holder.checkbox.setChecked(item.selection);
            return convertView;
        }

If i set the android:configChanges="orientation" it does not update my views in the Grid

score 0 · Answer 1 · edited Feb 04 '13 at 07:56

0

add the item blew in your activity at androidmanifest.xml

android:configChanges="orientation|screenSize|keyboardHidden"

edited Feb 04 '13 at 07:56

Paresh Mayani

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answered Feb 04 '13 at 07:23

nick.yu

89
3

If i set the android:configChanges="orientation" it does not update my views in the Grid. i need to update the views on the orientation change – sukarno Feb 04 '13 at 07:29
Everytime I see config change orientation I give a -1 for lazyness – Necronet Oct 29 '13 at 19:14

score 0 · Answer 2 · answered Feb 04 '13 at 07:55

0

Add this in your manifest

<activity
            android:name=".Your_Activity"
            android:configChanges="keyboardHidden|orientation" >

And make your changes to update view in Java code at Window.onOrientationChange

answered Feb 04 '13 at 07:55

Harpreet

2,990
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score 0 · Answer 3 · answered Feb 04 '13 at 08:23

You can retain the state before config changes and restore it after it got changed. You can do something similar as shown below.

/*
 * (non-Javadoc)
 * 
 * @see android.app.Activity#onRestoreInstanceState(android.os.Bundle)
 */
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    int scrollTo = savedInstanceState.getInt("firstItem");
    gridView.setSelection(scrollTo);
    setSelectedItem(savedInstanceState.getInt("selectedItem"));//A method to set the selected Item
}


/* (non-Javadoc)
 * @see android.app.Activity#onSaveInstanceState(android.os.Bundle)
 */
@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    int scrollTo = gridView.getFirstVisiblePosition();
    outState.putInt("firstItem", scrollTo);
    int selectedItem = getSelectedImageItem();//A method to retrieve the selected item from the adapter
    outState.putInt("selectedItem", selectedItem);
    /*additionally you can pass the entire collection into the bundle and retrieve it as well 
    using android.app.Activity#onRetainNonConfigurationInstance*/
}

Please go through the below link for further information, this will help you in the long run.

Handling Runtime config changes

Android gridview maintain the state when changes orientation but need to update views

3 Answers3