PictureUtils.java

package org.adaptlab.chpir.android.survey;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.view.Display;

import android.widget.ImageView;

public class PictureUtils {
    /**
     * Get a BitmapDrawable from a local file that is scaled down
     * to fit the current Window size.
     */
    @SuppressWarnings("deprecation")
    public static BitmapDrawable getScaledDrawable(Activity a, String path) {
        Display display = a.getWindowManager().getDefaultDisplay();
        float destWidth = display.getWidth();
        float destHeight = display.getHeight();

        // read in the dimensions of the image on disk
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        float srcWidth = options.outWidth;
        float srcHeight = options.outHeight;

        int inSampleSize = 1;
        if (srcHeight > destHeight || srcWidth > destWidth) {
            if (srcWidth > srcHeight) {
                inSampleSize = Math.round((float)srcHeight / (float)destHeight);
            } else {
                inSampleSize = Math.round((float)srcWidth / (float)destWidth);
            }
        }

        options = new BitmapFactory.Options();
        options.inSampleSize = inSampleSize;

        Bitmap bitmap = BitmapFactory.decodeFile(path, options);
        return new BitmapDrawable(a.getResources(), bitmap);
    }

    public static void cleanImageView(ImageView imageView) {
        if (!(imageView.getDrawable() instanceof BitmapDrawable)) 
            return;

        // clean up the view's image for the sake of memory
        BitmapDrawable b = (BitmapDrawable)imageView.getDrawable();
        b.getBitmap().recycle();
        imageView.setImageDrawable(null);
    }
}