我尝试在ListView中为新项目制作动画.我有稳定的id-s,所以我确切知道要动画的元素.问题来自ListView的循环机制.当我知道我有一个最近插入的元素时,我在视图上调用startAnimation.但随后,视图得到了回收,充满了不同的数据.
它会在UI上为错误的行设置动画.在某些时候,视图持有正确的数据,但随后被回收.我通过logcat证实了这一点.
有什么方法可以解决这个问题吗？
它会在UI上为错误的行设置动画.在某些时候,视图持有正确的数据,但随后被回收.我通过logcat证实了这一点.
有什么方法可以解决这个问题吗？
编辑：
public ExpensCursorAdapter(Context context,Cursor c,boolean autoRequery,CopyOnWriteArraySet<String> fadeAnimateTags) {
super(context,c,autoRequery);
this.mFadeAnimTags = fadeAnimateTags;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public void bindView(View view,Context context,Cursor cursor) {
setup(view,context,cursor);
}
private void setup(View view,Cursor cursor) {
final String id = cursor.getString(4);
if (LOCAL_LOGV) Log.v(TAG,String.format("Create item for %s. Received view: %s",id,view.toString()));
view.setTag(id);
final TextView dateText = (TextView) view.findViewById(R.id.date);
final TextView timeText = (TextView) view.findViewById(R.id.time);
final TextView title = (TextView) view.findViewById(R.id.title);
final TextView amount = (TextView) view.findViewById(R.id.amount);
final Date date = new Date(cursor.getLong(0));
title.setText(cursor.getString(1));
dateText.setText(dFormat.format(date));
timeText.setText(tFormat.format(date));
amount.setText(String.format("%d Ft",cursor.getInt(2)));
if (cursor.getInt(3) == 1) {
timeText.setTextColor(Color.LTGRAY);
title.setTextColor(Color.LTGRAY);
dateText.setTextColor(Color.LTGRAY);
amount.setTextColor(Color.LTGRAY);
} else {
timeText.setTextColor(Color.BLACK);
title.setTextColor(Color.BLACK);
dateText.setTextColor(Color.BLACK);
amount.setTextColor(Color.BLACK);
}
if (mFadeAnimTags.contains(id)) {
view.setAnimation(AnimationUtils.loadAnimation(context,R.anim.fade));
mFadeAnimTags.remove(id);
}
}
@Override
public View newView(Context context,Cursor cursor,ViewGroup parent) {
final LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.expense_list_item,parent,false);
setup(view,cursor);
return view;
}
解决方法
在自定义适配器的getView方法中为每个添加的元素设置动画.
public View getView(int position,View convertView,ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater) getActivity()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.simple_list_item_1,null);
}
ListData o = list.get(position);
TextView tt = (TextView) v.findViewById(R.id.toptext);
tt.setText(o.content);
Log.d("ListTest","Position : "+position);
if(flag == false) {
Animation animation = AnimationUtils.loadAnimation(getActivity(),R.anim.slide_top_to_bottom);
v.startAnimation(animation);
}
return v;
}
从而实现动画.
