android:如何使用触摸和拖动在它们之间创建不同的 "screens"和导航？

Question

我可以创建与主屏幕上相同类型的导航吗？ 也就是说，我想要可以使用触摸和拖动在不同的屏幕之间导航吗？ 我还没有看到任何关于它的信息，所以是时候问了:)

哦，我说的是安卓应用:)

Answer 1

没有内置任何东西，但您可以使用 ViewFlipper、GestureDetector 和 Animation 来“伪装”它(使用此方法您不会获得主屏幕的触觉拖动):

public class SwipeExample extends Activity {

    private static final int LEFT = 0;
    private static final int RIGHT = 1;

    ViewFlipper flipper;
    GestureDetector gestureDetector;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        flipper = (ViewFlipper) findViewById(R.id.flipper);
        gestureDetector = new GestureDetector(new MyGestureDetector());

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (gestureDetector.onTouchEvent(event))
            return true;
        else
            return false;
    }

    private Animation animateInFrom(int fromDirection) {

        Animation inFrom = null;

        switch (fromDirection) {
        case LEFT:
            inFrom = new TranslateAnimation(
                    Animation.RELATIVE_TO_PARENT, -1.0f, 
                    Animation.RELATIVE_TO_PARENT, 0.0f,
                    Animation.RELATIVE_TO_PARENT, 0.0f,
                    Animation.RELATIVE_TO_PARENT, 0.0f);
            break;
        case RIGHT:
            inFrom = new TranslateAnimation(
                    Animation.RELATIVE_TO_PARENT, +1.0f, 
                    Animation.RELATIVE_TO_PARENT, 0.0f,
                    Animation.RELATIVE_TO_PARENT, 0.0f,
                    Animation.RELATIVE_TO_PARENT, 0.0f);
            break;
        }

        inFrom.setDuration(250);
        inFrom.setInterpolator(new AccelerateInterpolator());
        return inFrom;
    }

    private Animation animateOutTo(int toDirection) {

        Animation outTo = null;

        switch (toDirection) {
        case LEFT:
            outTo = new TranslateAnimation(
                    Animation.RELATIVE_TO_PARENT, 0.0f,
                    Animation.RELATIVE_TO_PARENT, -1.0f,
                    Animation.RELATIVE_TO_PARENT, 0.0f,
                    Animation.RELATIVE_TO_PARENT, 0.0f);
            break;
        case RIGHT:
            outTo = new TranslateAnimation(
                    Animation.RELATIVE_TO_PARENT, 0.0f,
                    Animation.RELATIVE_TO_PARENT, +1.0f,
                    Animation.RELATIVE_TO_PARENT, 0.0f,
                    Animation.RELATIVE_TO_PARENT, 0.0f);
            break;
        }

        outTo.setDuration(250);
        outTo.setInterpolator(new AccelerateInterpolator());
        return outTo;
    }

    class MyGestureDetector extends SimpleOnGestureListener {

        // from:
        // http://www.codeshogun.com/blog/2009/04/16/how-to-implement-swipe-action-in-android/

        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;

        @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;
                if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                        && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    // right to left swipe
                    flipper.setInAnimation(animateInFrom(RIGHT));
                    flipper.setOutAnimation(animateOutTo(LEFT));
                    flipper.showNext();
                } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                        && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    // left to right swipe
                    flipper.setInAnimation(animateInFrom(LEFT));
                    flipper.setOutAnimation(animateOutTo(RIGHT));
                    flipper.showPrevious();
                }
            } catch (Exception e) {}
            return false;
        }
    }

}