畫廊在屏幕上重置旋轉

Question

我有一個畫廊視圖，與BaseAdapter，我從互聯網下載圖像，下載圖像，並設置爲畫廊異步。大約有2000張圖片。 當我旋轉屏幕，asyntask繼續，但畫廊設置爲空，不顯示任何現在或舊圖像。

這是BaseAdapter的代碼：

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我設置android:configChanges="keyboardHidden|orientation"

我想保存在變量多少圖像已經下載但，當旋轉屏幕設置的所有圖像，但是當超過500時，這個過程非常緩慢。

任何想法？謝謝

Answer 1

看一看ImageLoader的。這個鏈接可以幫助Lazy load of images in ListView或http://androidimageloader.com/

您也可以駁回活動在AndroidManifest改變方向：

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