TOPIC:

public void setPreviewThumbnail(int i, String directory, Page p, Document d, boolean showOnlyAdPageThumbnail) {

		//normal thumbnail
		String directoryPlusThumbnail = directory + "AndroidNormal_THUMBNAIL_" + i + ".jpg";
		//check for adpage-file: thumbnail if not already downloaded
		if (p.isAdPage() && !showOnlyAdPageThumbnail){
			String temp = directory + "AndroidNormal_PDF_" + i + ".jpg";
			File file = new File(temp);
			if(file.exists()) {
				directoryPlusThumbnail = directory + "AndroidNormal_PDF_" + i + ".jpg";
				Log.d(TAG, "#adpage-file here");
			} else {
				Log.d(TAG, "#no adpage-file here");
			}
		}
		//double-page thumbnail
		String directoryPlusThumbnailDoublePage = "";
		if(p.isDoublePage()){
			directoryPlusThumbnailDoublePage = directory + "AndroidNormal_THUMBNAIL_" + (i +1) + ".jpg";
		}
		//temporary cache-files
		String tempPdf = APAWlApp.getCacheDirectory().getAbsolutePath()  + File.separator + issue.getUniqueId() + "_page_" + i + ".pdf";
		String cache = APAWlApp.getCacheDirectory().getAbsolutePath()  + File.separator + issue.getUniqueId() + "_page_" + i + "_cachefile";

		d.Create(tempPdf);
		//wichtig! cache muss gesetzt werden!
		d.SetCache(cache);

		com.radaee.pdf.Page page = null;
		if(p.isDoublePage()){
			page = d.NewPage(0, (widthThumbnail *2), heightThumbnail);//create A3 quer paper
		} else {
			page = d.NewPage(0, widthThumbnail, heightThumbnail);//create A4 paper
		}


		PageContent content = new PageContent();
		content.Create();//create content, do not forget.


		//set alpha for both fill and stroke
		DocGState dgs = d.NewGState();
		dgs.SetFillAlpha(0x80);//set alpha value to 0.5
		dgs.SetStrokeAlpha(0x80);//set alpha value to 0.5
		ResGState rgs = page.AddResGState(dgs);
		content.GSSet(rgs);

		//write a bitmap
		content.GSSave();
		dgs = d.NewGState();
		dgs.SetFillAlpha(255);//set alpha value to 1
		dgs.SetStrokeAlpha(255);//set alpha value to 1
		rgs = page.AddResGState(dgs);
		content.GSSet(rgs);

		Bitmap bit=null;

		if(!new File(directoryPlusThumbnail).exists()) {

			Log.e(TAG, "#directoryPlusThumbnail="+directoryPlusThumbnail);
			bit = Bitmap.createBitmap(50, 100, Bitmap.Config.ARGB_8888);
			Canvas canvas = new Canvas(bit);
			canvas.drawColor(0xFFFFFFFF);
		} else {
			Log.d(TAG, "#directoryPlusThumbnail="+directoryPlusThumbnail);
		}

		if(bit == null){
			if(p.isDoublePage()){

				BitmapFactory.Options options = new BitmapFactory.Options();
				options.inPurgeable = false;
				options.inPreferredConfig = Bitmap.Config.ARGB_8888;
				options.inJustDecodeBounds = false;

				//Memory-Fix fuer API-Level <2.3		
				if (android.os.Build.VERSION.SDK_INT <=  android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
					options.inSampleSize = 4;
				} else {
					options.inSampleSize = 1;
				}
				bit=combineBitmaps(BitmapFactory.decodeFile(directoryPlusThumbnail, options), BitmapFactory.decodeFile(directoryPlusThumbnailDoublePage, options));			
			} else {

				BitmapFactory.Options options = new BitmapFactory.Options();
				options.inPurgeable = false;
				options.inPreferredConfig = Bitmap.Config.ARGB_8888;
				options.inJustDecodeBounds = false;

				//Memory-Fix fuer API-Level <2.3		
				if (android.os.Build.VERSION.SDK_INT <=  android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
					options.inSampleSize = 4;
				} else {
					options.inSampleSize = 1;
				}
				bit = BitmapFactory.decodeFile(directoryPlusThumbnail, options);

			}
		}

		DocImage dimg = d.NewImage(bit, true);
		bit.recycle();
		bit = null;
		ResImage rimg = page.AddResImage(dimg);
		Matrix mat = null;
		if(p.isDoublePage()){
			mat = new Matrix( widthThumbnail *2, heightThumbnail, 0, 0 );
		} else {
			mat = new Matrix( widthThumbnail, heightThumbnail, 0, 0 );
		}

		content.GSSetMatrix(mat);
		mat.Destroy();
		content.DrawImage(rimg);
		content.GSRestore();


		//add content to page
		page.AddContent(content, true);
		content.Destroy();

		page.Close();

		//delete temporary files
		File cacheFile = new File(cache);
		File tempFile = new File(tempPdf);
		if(cacheFile.exists()) {
			cacheFile.delete();
		}
		if(tempFile.exists()) {
			tempFile.delete();
		}

	}