Android: Create ImageUtils: common ImageProcessing functions

Source/ui_android/java/com/virtualapplications/play/ImageUtils.java

@@ -0,0 +1,86 @@
+package com.virtualapplications.play;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+
+import org.apache.commons.io.IOUtils;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class ImageUtils
+{
+	public static Bitmap getSampledImage(Context context, InputStream inputStream) throws IOException
+	{
+		if(inputStream.markSupported())
+		{
+			inputStream.mark(inputStream.available());
+
+			BitmapFactory.Options options = new BitmapFactory.Options();
+			options.inJustDecodeBounds = true;
+			BitmapFactory.decodeStream(inputStream, null, options);
+			inputStream.reset();
+
+			options.inSampleSize = calculateInSampleSize(context, options);
+			options.inJustDecodeBounds = false;
+			return BitmapFactory.decodeStream(inputStream, null, options);
+		}
+		else
+		{
+			ByteArrayInputStream byteArrayInputStream = null;
+			try
+			{
+				byte[] imageArray = IOUtils.toByteArray(inputStream);
+				byteArrayInputStream = new ByteArrayInputStream(imageArray);
+
+				return getSampledImage(context, byteArrayInputStream);
+			}
+			catch(Exception e)
+			{
+				e.printStackTrace();
+			}
+			finally
+			{
+				try
+				{
+					if(byteArrayInputStream != null)
+					{
+						byteArrayInputStream.close();
+					}
+				}
+				catch(Exception e)
+				{
+
+				}
+			}
+		}
+		return null;
+	}
+
+	private static int calculateInSampleSize(Context context, BitmapFactory.Options options)
+	{
+		final int height = options.outHeight;
+		final int width = options.outWidth;
+
+		int reqWidth = (int) context.getResources().getDimension(R.dimen.cover_width);
+		int reqHeight = (int) context.getResources().getDimension(R.dimen.cover_height);
+
+		int inSampleSize = 1;
+
+		if(height > reqHeight || width > reqWidth)
+		{
+
+			final int halfHeight = height / 2;
+			final int halfWidth = width / 2;
+
+			while((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth)
+			{
+				inSampleSize *= 2;
+			}
+		}
+
+		return inSampleSize;
+	}
+}