Android: How to change my ExpandAnimation class to handle animation correctly?
- by IamStalker
here is my animation class that i have taken from Udnic - thanks m8,
but i'm using it "not from closed position but from opened" and it's jumps and not behaving correctly.
what should i do?
public class ExpandAnimation extends Animation {
private View mAnimatedView;
private LinearLayout.LayoutParams mViewLayoutParams;
public int mMarginStart, mMarginEnd;
private boolean mIsVisibleAfter = false;
private boolean mWasEndedAlready = false;
private ImageView mImageView;
/**
* Initialize the animation
* @param view The layout we want to animate
* @param duration The duration of the animation, in ms
*/
public ExpandAnimation(View view, int duration, ImageView imageView) {
setDuration(duration);
mImageView = imageView;
mAnimatedView = view;
mViewLayoutParams = (LinearLayout.LayoutParams) view.getLayoutParams();
mMarginStart = mMarginEnd = 0;
// decide to show or hide the view
mIsVisibleAfter = (view.getVisibility() == View.VISIBLE);
//mIsVisibleAfter = (mViewLayoutParams.bottomMargin == 0);
mMarginStart = mViewLayoutParams.bottomMargin;
if(mMarginStart != 0)
mMarginStart = 0 - view.getHeight();
mMarginEnd = (mMarginStart == 0 ? (0 - view.getHeight()) : 0);
view.setVisibility(View.VISIBLE);
mImageView.setImageResource(R.drawable.expand_open);
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
if (interpolatedTime < 1.0f) {
// Calculating the new bottom margin, and setting it
mViewLayoutParams.bottomMargin = mMarginStart
+ (int) ((mMarginEnd - mMarginStart) * interpolatedTime);
// Invalidating the layout, making us seeing the changes we made
mAnimatedView.requestLayout();
// Making sure we didn't run the ending before (it happens!)
} else if (!mWasEndedAlready) {
mViewLayoutParams.bottomMargin = mMarginEnd;
mAnimatedView.requestLayout();
// if (mIsVisibleAfter) {
if(mMarginEnd != 0) {
mAnimatedView.setVisibility(View.GONE);
mImageView.setImageResource(R.drawable.expand_close);
}
mWasEndedAlready = true;
}
}
}
