要实现Spinner选项的分组折叠动画,可以通过以下步骤进行:
创建一个自定义的SpinnerAdapter类,继承自BaseAdapter,并实现SpinnerAdapter接口的方法。
在SpinnerAdapter中,定义一个内部类GroupItem来表示分组信息,包括分组标题和选项列表。
在getView()方法中,根据position获取对应的GroupItem对象,并根据其isExpanded属性来确定是否展开或折叠选项。
在展开或折叠选项时,可以通过属性动画实现平滑的动画效果。例如,使用ValueAnimator来改变选项的高度,从而实现展开或折叠的效果。
以下是一个简单的示例代码:
public class MySpinnerAdapter extends BaseAdapter implements SpinnerAdapter {
private Context mContext;
private List<GroupItem> mGroupItems;
public MySpinnerAdapter(Context context, List<GroupItem> groupItems) {
mContext = context;
mGroupItems = groupItems;
}
@Override
public int getCount() {
return mGroupItems.size();
}
@Override
public Object getItem(int position) {
return mGroupItems.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
GroupItem groupItem = mGroupItems.get(position);
View view = LayoutInflater.from(mContext).inflate(R.layout.item_spinner_group, parent, false);
TextView tvTitle = view.findViewById(R.id.tv_title);
tvTitle.setText(groupItem.getTitle());
LinearLayout llOptions = view.findViewById(R.id.ll_options);
if (groupItem.isExpanded()) {
llOptions.setVisibility(View.VISIBLE);
} else {
llOptions.setVisibility(View.GONE);
}
llOptions.removeAllViews();
for (String option : groupItem.getOptions()) {
View optionView = LayoutInflater.from(mContext).inflate(R.layout.item_spinner_option, llOptions, false);
TextView tvOption = optionView.findViewById(R.id.tv_option);
tvOption.setText(option);
llOptions.addView(optionView);
}
view.setOnClickListener(v -> {
if (groupItem.isExpanded()) {
collapseOptions(llOptions);
} else {
expandOptions(llOptions);
}
groupItem.setExpanded(!groupItem.isExpanded());
});
return view;
}
private void expandOptions(View view) {
ValueAnimator animator = ValueAnimator.ofInt(0, view.getMeasuredHeight());
animator.addUpdateListener(animation -> {
int value = (int) animation.getAnimatedValue();
ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
layoutParams.height = value;
view.setLayoutParams(layoutParams);
});
animator.setDuration(300);
animator.start();
}
private void collapseOptions(View view) {
ValueAnimator animator = ValueAnimator.ofInt(view.getMeasuredHeight(), 0);
animator.addUpdateListener(animation -> {
int value = (int) animation.getAnimatedValue();
ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
layoutParams.height = value;
view.setLayoutParams(layoutParams);
});
animator.setDuration(300);
animator.start();
}
public static class GroupItem {
private String title;
private List<String> options;
private boolean expanded;
public GroupItem(String title, List<String> options) {
this.title = title;
this.options = options;
this.expanded = false;
}
public String getTitle() {
return title;
}
public List<String> getOptions() {
return options;
}
public boolean isExpanded() {
return expanded;
}
public void setExpanded(boolean expanded) {
this.expanded = expanded;
}
}
}
在上面的代码中,MySpinnerAdapter类实现了SpinnerAdapter接口,并通过自定义的GroupItem类来表示分组信息。在getView()方法中,根据GroupItem对象的isExpanded属性来展开或折叠选项,并通过属性动画实现平滑的动画效果。GroupItem类包含了分组标题、选项列表和展开状态的属性。
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