Class responsible for View Display storage on Internal Storage.

ViewImageStorage.java

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.ImageView;

import java.io.File;
import java.io.FileOutputStream;
import java.util.GregorianCalendar;

/**
 * Class responsible for View Display storage on Internal Storage.
 * <p/>
 * User: Pedro Veloso <pedro.veloso@emerge.pt>
 */
public final class ViewImageStorage {

    // change this to change the default jpeg quality used to store the images
    private final static int JPEG_QUALITY = 75;

    // change this to define the color to fill the transparent area
    private final static int BACKGROUND_COLOR = Color.BLACK;


    /**
     * Save the display of a View to the InternalStorage
     *
     * @param ctx  Application Context
     * @param view View to store on internal storage
     * @return Name on internal storage, or empty if image not saved
     */
    public synchronized static String saveImageOnInternalStorage(Context ctx, View view) {
        GregorianCalendar time = new GregorianCalendar();
        String saveName;
        //append the unix timestamp to the filename. together with synchronized access it will result in unique naming
        saveName = Long.valueOf(time.getTimeInMillis()).toString() + ".jpg";
        Bitmap bitmap;
        if (view instanceof ImageView) {
            // this is a ImageView, process it differently
            
            //enable the drawing cache to draw the view as bitmap
            view.setDrawingCacheEnabled(true);
            bitmap = view.getDrawingCache();
        } else {
            // is not an ImageView
            bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bitmap);
            Drawable bgDrawable = view.getBackground();
            if (bgDrawable != null) {
                bgDrawable.draw(canvas);
            } else {
                canvas.drawColor(BACKGROUND_COLOR);
            }
            view.draw(canvas);

        }

        // save the bitmap
        try {
            FileOutputStream fos = new FileOutputStream(ctx.getFilesDir().getAbsolutePath() + "/" + saveName);
            bitmap.compress(Bitmap.CompressFormat.JPEG, JPEG_QUALITY, fos);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }

        return saveName;
    }


    /**
     * Restore a saved image to a given ImageView. If the image does not exist then the
     * ImageView will contain the drawable passed as a parameter.
     *
     * @param iv   ImageView to display contents
     * @param path Path of the stored image
     * @param ctx  Application Context
     */
    public static void restoreImageToImageView(Context ctx, ImageView iv, String path, Drawable noImage) {
        if (path != null && path.length() > 0) {
            File filePath = ctx.getFileStreamPath(path);
            if (filePath.exists()) {
                iv.setImageDrawable(Drawable.createFromPath(filePath.toString()));
            } else {
                if (noImage != null) {
                    // the given image does not exist in the internal storage, use noImage instead
                    iv.setImageDrawable(noImage);
                }
            }
        }
    }

}