屏幕上的图库重置旋转

时间:2012-11-06 08:08:18

标签: android screen-orientation android-gallery baseadapter

我有一个画廊视图,使用BaseAdapter,我从互联网下载图像,下载图像,并设置为图库异步。大约有2000张图片。 当我旋转屏幕时,asyntask继续,但画廊设置为空,不显示任何现在或旧图像。

这是BaseAdapter的代码:

private class AdaptadorImagenes extends BaseAdapter {

        private Context contexto = null;
        private ArrayList<Integer> datos = new ArrayList<Integer>();

        public AdaptadorImagenes(Context contexto) {

            this.contexto = contexto;
        }

        public void addItem(Integer posicion) {

            datos.add(posicion);
            notifyDataSetChanged();
        }

        @Override
        public int getCount() {
            return datos.size();
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            ImageView imagen = new ImageView(contexto);
            imagen.setImageBitmap(getBitMapRedimensionado(position));
            imagen.setScaleType(ScaleType.FIT_XY);
            return imagen;

        }

        /**
         * Metodo para redimensionar un bimap
         * 
         * @param posicion
         *            del bitmap en una lista que contiene los path
         * @return bitmap redimensionado
         */
        private Bitmap getBitMapRedimensionado(int posicion) {

            File fichero = new File(pathImagenes.get(posicion));
            Bitmap bmOriginal = redondeaEsquinasBitmap(Bitmap
                    .createScaledBitmap(
                            BitmapFactory.decodeFile(fichero.toString()), 210,
                            210, true));

            return bmOriginal;
        }

        /**
         * Metodo para redondear las esquinas de un bitmap
         * 
         * @param bitmap
         *            a redondear
         * @return bitmap redondeado
         */
        public Bitmap redondeaEsquinasBitmap(Bitmap bitmap) {
            Bitmap salida = Bitmap.createBitmap(bitmap.getWidth(),
                    bitmap.getHeight(), Config.ARGB_8888);


Canvas canvas = new Canvas(salida);

        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bitmap.getWidth(),
                bitmap.getHeight());
        final RectF rectF = new RectF(rect);
        final float roundPx = 12;

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return salida;
    }

}

在Manifiest中我设置了android:configChanges="keyboardHidden|orientation"

我认为保存一个变量已经下载了多少图像,并且在旋转屏幕时设置了所有图像,但是当超过500时这个过程非常慢。

有什么想法吗?谢谢

1 个答案:

答案 0 :(得分:0)

看看ImageLoader。此链接可以帮助Lazy load of images in ListViewhttp://androidimageloader.com/

此外,您可以在活动中忽略AndroidManifest中的更改方向:

android:name="com.example.MainActivity" android:configChanges="keyboardHidden|orientation" android:screenOrientation="portrait"