我正在尝试在我的布局中添加一个类似于滑动抽屉的滑动面板,除了它将放置在我的主布局的左侧而不是覆盖它。我的布局左上角有一个小按钮,当我单击它时,它会展开/折叠面板。当它展开/折叠时,我希望动画平滑,以便与其相邻的视图也会移动。这是我尝试过的代码。面板在第一次展开/折叠后停止工作:
public Animation expandHiddenPanel(final View v, final boolean expand) {
panelExpanded = expand;
v.measure(MeasureSpec.makeMeasureSpec(200, MeasureSpec.AT_MOST),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
final int initialWidth = v.getMeasuredWidth();
Log.i("test", "initialWidth = " + initialWidth);
v.getLayoutParams().width = 0;
v.setVisibility(View.VISIBLE);
Animation a = new Animation() {
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
int newWidth;
if (expand) {
newWidth = (int)(initialWidth * interpolatedTime);
Log.i("test", "new Width = " + newWidth);
}
else {
newWidth = (int)(initialWidth * (1 - interpolatedTime));
Log.i("test", "new Width = " + newWidth);
}
v.getLayoutParams().width = newWidth;
v.requestLayout();
}
@Override
public boolean willChangeBounds() {
return true;
}
};
a.setInterpolator(new AccelerateInterpolator());
a.setDuration(2500);
v.startAnimation(a);
return a;
}