Android question - how to prep 100 images to be shown via Fling/Swipe?

Posted by fooyee on Stack Overflow See other posts from Stack Overflow or by fooyee
Published on 2010-01-29T13:03:07Z Indexed on 2010/04/20 5:13 UTC
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I'm totally new to this, been tinkering around for a week.

Came up with a simple image viewer app for 2 images.

Feature: Left and right swipes will switch the images. Dead simple.

What i'd like to do: Have up to 100 images.

note: All my images are in my res/drawable folder.
They're named image1.png to image100.png

I obviously don't want to do:

    ImageView i = new ImageView(this);
    i.setImageResource(R.drawable.image1);
    viewFlipper.addView(i);
    ImageView i2 = new ImageView(this);
    i2.setImageResource(R.drawable.image2);
    viewFlipper.addView(i2);
    ImageView i3 = new ImageView(this);
    i3.setImageResource(R.drawable.image3);
    viewFlipper.addView(i3);

all the way to i100.

how do I make this into a loop, which is flexible and reads everything from the drawable folder ( and not be limited to 100 images)?

source:

    public class ImageViewTest extends Activity {
        private static final String LOGID = "CHECKTHISOUT";

        private static final int SWIPE_MIN_DISTANCE = 120;
        private static final int SWIPE_MAX_OFF_PATH = 250;
        private static final int SWIPE_THRESHOLD_VELOCITY = 200;
        private GestureDetector gestureDetector;
        View.OnTouchListener gestureListener;

        private Animation slideLeftIn;
        private Animation slideLeftOut;
        private Animation slideRightIn;
        private Animation slideRightOut;
        private ViewFlipper viewFlipper;

        String message = "Initial Message"; 
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            //Set up viewflipper
            viewFlipper = new ViewFlipper(this);       
            ImageView i = new ImageView(this);
            i.setImageResource(R.drawable.sample_1);
            ImageView i2 = new ImageView(this);
            i2.setImageResource(R.drawable.sample_2);
            viewFlipper.addView(i);
            viewFlipper.addView(i2);

            //set up animations
            slideLeftIn = AnimationUtils.loadAnimation(this, R.anim.slide_left_in);
            slideLeftOut = AnimationUtils.loadAnimation(this, R.anim.slide_left_out);
            slideRightIn = AnimationUtils.loadAnimation(this, R.anim.slide_right_in);
            slideRightOut = AnimationUtils.loadAnimation(this, R.anim.slide_right_out);

            //put up a brownie as a starter
            setContentView(viewFlipper);

            gestureDetector = new GestureDetector(new MyGestureDetector());
        }

        public class MyGestureDetector extends SimpleOnGestureListener {
            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                try {
                    if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                        return false;
                    // right to left swipe
                    if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                        Log.v(LOGID,"right to left swipe detected");
                        viewFlipper.setInAnimation(slideLeftIn);
                        viewFlipper.setOutAnimation(slideLeftOut);
                        viewFlipper.showNext();
                        setContentView(viewFlipper);

                    } // left to right swipe 
                    else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                        Log.v(LOGID,"left to right swipe detected");                    
                        viewFlipper.setInAnimation(slideRightIn);
                        viewFlipper.setOutAnimation(slideRightOut);
                        viewFlipper.showPrevious();
                        setContentView(viewFlipper);

                    }
                } catch (Exception e) {
                    // nothing
                }
                return false;
            }
        }

        // This doesn't work
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            if (gestureDetector.onTouchEvent(event)){
                Log.v(LOGID,"screen touched");
                return true;
            }
            else{
                return false;
            }
        }
    }

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