I have to show one animation on ImageView. It will like card flipping. The ImageView showing X image will flip and will show Y image. How can I do the same? Any idea?
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问题:
回答1:
You can use this class for flip animation
FlipAnimation.class
import android.graphics.Camera;
import android.graphics.Matrix;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.Transformation;
public class FlipAnimation extends Animation {
private Camera camera;
private View fromView;
private View toView;
private float centerX;
private float centerY;
private boolean forward = true;
/**
* Creates a 3D flip animation between two views.
*
* @param fromView First view in the transition.
* @param toView Second view in the transition.
*/
public FlipAnimation(View fromView, View toView) {
this.fromView = fromView;
this.toView = toView;
setDuration(500);
setFillAfter(false);
setInterpolator(new AccelerateDecelerateInterpolator());
}
public void reverse() {
forward = false;
View switchView = toView;
toView = fromView;
fromView = switchView;
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
centerX = width / 2;
centerY = height / 2;
camera = new Camera();
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
// Angle around the y-axis of the rotation at the given time
// calculated both in radians and degrees.
final double radians = Math.PI * interpolatedTime;
float degrees = (float) (180.0 * radians / Math.PI);
// Once we reach the midpoint in the animation, we need to hide the
// source view and show the destination view. We also need to change
// the angle by 180 degrees so that the destination does not come in
// flipped around
if (interpolatedTime >= 0.5f) {
degrees -= 180.f;
fromView.setVisibility(View.GONE);
toView.setVisibility(View.VISIBLE);
}
if (forward)
degrees = -degrees; //determines direction of rotation when flip begins
final Matrix matrix = t.getMatrix();
camera.save();
camera.rotateY(degrees);
camera.getMatrix(matrix);
camera.restore();
matrix.preTranslate(-centerX, -centerY);
matrix.postTranslate(centerX, centerY);
}
}
And add animation using below
FlipAnimation flipAnimation = new FlipAnimation(view1,view2);
if (view1.getVisibility() == View.GONE) {
flipAnimation.reverse();
}else{
view1.startAnimation(flipAnimation);
}
You have to use 2 imageviews for this.