Fixing crash when picking an external image

    private void addTemporaryWallpaperTile(final Uri uri, boolean fromRestore) {

        // Add a tile for the image picked from Gallery, reusing the existing tile if there is one.

        View existingTile = null;

        View imageTile = null;

        int indexOfExistingTile = 0;

        for (; indexOfExistingTile < mWallpapersView.getChildCount(); indexOfExistingTile++) {

            View thumbnail = mWallpapersView.getChildAt(indexOfExistingTile);

            Object tag = thumbnail.getTag();

            if (tag instanceof UriWallpaperInfo && ((UriWallpaperInfo) tag).mUri.equals(uri)) {

                existingTile = thumbnail;

                imageTile = thumbnail;

                break;

            }

        }

        final View pickedImageThumbnail;

        final UriWallpaperInfo info;

        if (existingTile != null) {

            pickedImageThumbnail = existingTile;

        if (imageTile != null) {

            // Always move the existing wallpaper to the front so user can see it without scrolling.

            mWallpapersView.removeViewAt(indexOfExistingTile);

            mWallpapersView.addView(pickedImageThumbnail, 0);

            info = (UriWallpaperInfo) pickedImageThumbnail.getTag();

            info = (UriWallpaperInfo) imageTile.getTag();

        } else {

            // This is the first time this temporary wallpaper has been added

            info = new UriWallpaperInfo(uri);

            pickedImageThumbnail = createTileView(mWallpapersView, info, true);

            mWallpapersView.addView(pickedImageThumbnail, 0);

            imageTile = createTileView(mWallpapersView, info, true);

            mTempWallpaperTiles.add(uri);

        }

        mWallpapersView.addView(imageTile, 0);

        info.loadThumbnaleAsync(this);

        updateTileIndices();

        if (!fromRestore) {

            onClick(existingTile);

            onClick(imageTile);

        }

    }