Image swiping and changing with buttons as well

问题:

I am trying to make a gallery app.I have two buttons for 'next' and 'back' when i press on next button the i need to show the next image also i need to change the images by swiping. I have tried with image adapter. but i dont know to change the images with buttons.

回答1:

Try to use this tutorial for your reference to implement the Gallery with buttons.

In this tutorial I use Arrow buttons for next and previous.

I implement some more functionality in this tutorial.

like:

thumb and full image view in the screen.

from thumb images which you select that highlight.

By Arrow buttons also you change the images(next/previous).

回答2:

You can create new class to detect swipe and create an instant to use it.

public class SwipeDetect implements OnTouchListener {

private final GestureDetector gestureDetector = new GestureDetector(new GestureListener());

public boolean onTouch(final View view, final MotionEvent motionEvent) {
    return gestureDetector.onTouchEvent(motionEvent);
}

private final class GestureListener extends SimpleOnGestureListener {

    private static final int SWIPE_THRESHOLD = 100;
    private static final int SWIPE_VELOCITY_THRESHOLD = 100;

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        boolean result = false;
        try {
            float diffY = e2.getY() - e1.getY();
            float diffX = e2.getX() - e1.getX();
            if (Math.abs(diffX) > Math.abs(diffY)) {
                if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffX > 0) {
                        onSwipeRight();
                    } else {
                        onSwipeLeft();
                    }
                }
            } else {
                if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        onSwipeBottom();
                    } else {
                        onSwipeTop();
                    }
                }
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return result;
    }
}

public void onSwipeRight() {
}

public void onSwipeLeft() {
}

public void onSwipeTop() {
}

public void onSwipeBottom() {
} }

Use it:

YourImageView.setOnTouchListener(new SwipeDetect() {
            public void onSwipeRight() {
                //Your code here
            }

            public void onSwipeLeft() {
                //Your code here
            }
        });

You can use it for imageview, layout...

回答3:

Try with this one for starting point. You can also implement the tutorial shown here.