I want to animate slide down and slide up on expandablelistview when I
click the groupItem.Then I have finish the slide down.
public class ExpandAnimation extends Animation {
private static final String TAG = "ExpandAnimation";
private View mAnimatedView;
private LayoutParams mViewLayoutParams;
private int mMarginStart, mMarginEnd;
private boolean mIsVisibleAfter = false;
private boolean mWasEndedAlready = false;
/**
* 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) {
setDuration(duration);
mAnimatedView = view;
mViewLayoutParams = (LayoutParams) view.getLayoutParams();
// if the bottom margin is 0,
// then after the animation will end it'll be negative, and
invisible.
mIsVisibleAfter = (mViewLayoutParams.bottomMargin == 0);
mMarginStart = mViewLayoutParams.bottomMargin;
Log.i(TAG, "mMarginStart:>>>>>>>"+mMarginStart);
mMarginEnd = (mMarginStart == 0 ? (0- view.getHeight()) : 0);
Log.i(TAG, "mMarginEnd:>>>>>>>"+mMarginEnd);
view.setVisibility(View.VISIBLE);
}
@Override
protected void applyTransformation(float interpolatedTime,
Transformation t) {
super.applyTransformation(interpolatedTime, t);
Log.i(TAG, "applyTransformation-->"+interpolatedTime);
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) {
mAnimatedView.setVisibility(View.GONE);
}
mWasEndedAlready = true;
}
}
}
public View getChildView(int groupPosition, int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
Log.i(TAG, "getChildView");
@SuppressWarnings("unchecked")
String text = ((Map<String, String>) getChild(groupPosition,
childPosition)).get("child");
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.child, null);
}
View toolbar = convertView.findViewById(R.id.toolbar);
setAnimationView(toolbar);
((LinearLayout.LayoutParams)
toolbar.getLayoutParams()).bottomMargin = -75;
toolbar.setVisibility(View.GONE);
ExpandAnimation expandAni = new ExpandAnimation(toolbar, 1000);
toolbar.startAnimation(expandAni);
TextView tv = (TextView) convertView.findViewById(R.id.childTo);
tv.setText(text);
return convertView;
}
But when I click the groupItem to collapse the group,it doesn't call
the getChildView() method.So how can I to call the getChildView() and
let it slide up? Thanks.
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