我使用自己的布局制作了一个带有自定义适配器的ListView，在这个布局上有一个文本视图，一个按钮和三个图像按钮，最初是setVisibility.GONE
我试图动画这个按钮，当用户点击它时，它会从右向左改变它的位置，为三个图像按钮提供空间。
问题是，动画工作的唯一项目是列表中的最后一项。我希望动画可以在所有项目中使用。
以下是我adapter的代码：
public class ListaAdapter extends BaseAdapter implements ListAdapter {
private ArrayList<String> list = new ArrayList<String>();
private Context context;
private ListView lista;
private Button btnAbrir;
private RelativeLayout relativeLayout;
private ObjectAnimator animation;
public ListaAdapter (ArrayList<String> list, Context context, ListView a) {
this.list = list;
this.context = context;
this.lista = a;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int pos) {
return list.get(pos);
}
@Override
public long getItemId(int pos) {
return 0;
//just return 0 if your list items do not have an Id variable.
}
@Override
public View getView(final int position, View convertView, ViewGroup
parent)
{
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.custom_list, null);
}
TextView listItemText = (TextView)view.findViewById(R.id.textoItem);
listItemText.setText(list.get(position));
final LinearLayout btnLayout = (LinearLayout)
view.findViewById(R.id.btnLayout);
relativeLayout = (RelativeLayout) view.findViewById(R.id.layout);
btnAbrir = (Button)view.findViewById(R.id.btnAbrir);
ImageButton btnNaoSei = (ImageButton)view.findViewById(R.id.btnNaoSei);
ImageButton btnAceitar =
(ImageButton)view.findViewById(R.id.btnAceitar);
ImageButton btnNegar = (ImageButton)view.findViewById(R.id.btnNegar);
animation = ObjectAnimator.ofFloat(btnAbrir,"x",200);
btnLayout.setVisibility(View.GONE);
btnAbrir.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
btnLayout.setVisibility(View.VISIBLE);
animate();
}
});
return view;
}
private void animate()
{
animation.setDuration(500);
animation.start();
}
}
这是我的custom_list.xml布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:animateLayoutChanges="true">
<RelativeLayout
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="@color/white">
<LinearLayout
android:id="@+id/btnLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:orientation="horizontal">
<RelativeLayout
android:layout_width="@dimen/_32sdp"
android:layout_height="@dimen/_50sdp"
android:background="@color/compras_barra">
<ImageButton
android:id="@+id/btnNaoSei"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="false"
android:layout_alignParentStart="false"
android:layout_alignParentTop="false"
android:backgroundTint="@color/compras_barra"
android:contextClickable="false"
app:srcCompat="@drawable/a12" />
<TextView
android:id="@+id/textView11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btnNaoSei"
android:layout_centerHorizontal="true"
android:text="NÃO SEI"
android:textColor="@color/white"
android:textSize="8sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="@dimen/_32sdp"
android:layout_height="@dimen/_50sdp"
android:background="@color/compras">
<ImageButton
android:id="@+id/btnAceitar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="11dp"
android:background="@color/compras"
app:srcCompat="@drawable/a11" />
<TextView
android:id="@+id/textView12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/btnAceitar"
android:paddingEnd="@dimen/_3sdp"
android:paddingTop="@dimen/_8sdp"
android:text="ACEITAR"
android:textColor="@color/white"
android:textSize="8sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="@dimen/_32sdp"
android:layout_height="@dimen/_50sdp"
android:background="@color/compras_texto2">
<ImageButton
android:id="@+id/btnNegar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:background="@color/compras_texto2"
app:srcCompat="@drawable/a10" />
<TextView
android:id="@+id/textView13"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="12dp"
android:paddingBottom="@dimen/_1sdp"
android:text="NEGAR"
android:textColor="@color/white"
android:textSize="8sp" />
</RelativeLayout>
</LinearLayout>
<Button
android:id="@+id/btnAbrir"
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@drawable/a09"
android:layout_alignTop="@+id/textoItem"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<TextView
android:id="@+id/textoItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/_10sdp"
android:layout_marginTop="@dimen/_10sdp"
android:maxWidth="200dp"
android:text="TextView"
android:textColor="@color/compras_texto2" />
</RelativeLayout>
有关如何实现这一目标的任何想法？提前谢谢。
答案 0 :(得分：1)
您需要采用以下方法并创建ViewHolder，以便您的适配器知道List
该行的最后一个UI元素仅动画，因为这是Adapater在View中创建List时唯一的最后已知组件ID。因此它将为最后一行元素设置动画
您必须在ViewHolder中添加class嵌套Adapter并声明您的UI组件。在setTag
getTag和getView方法
总体而言，您必须在adapter
getView这样的内容
public class SListAdapter extends ArrayAdapter<String> {
private Context context;
private String[] seCtnColors;
private List<Subscription> item;
private ViewHolder mainViewHolder = null;
private ViewHolder viewHolder;
private LayoutInflater inflater;
private View row;
public SListAdapter(Context c, List<Subscription> subscriptions)
{
super(c, R.layout.row,R.id.rowNameTV);
this.context=c;
this.item = subscriptions;
}
@Override
public int getCount() {
return this.item.size();
}
@Override
public View getView(final int position, final View convertView, ViewGroup parent) {
row = null;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.row,parent,false);
viewHolder = new ViewHolder();
initAdapterUI();
setAdapterDataset(position);
return row;
}
private void initAdapterUI() {
viewHolder.animatedGifViewHol = row.findViewById(R.id.row_animated_gif);
viewHolder.alertBarVerticalViewHol = row.findViewById(R.id.alertBarVerticalView);
viewHolder.firstNameTVHol = (TextView) row.findViewById(R.id.rowNameTV);
viewHolder.phoneNumberTVHol = (TextView) row.findViewById(R.id.rowNumberTV);
viewHolder.switchStateTVHol = (TextView) row.findViewById(R.id.switchStateTV);
row.setTag(viewHolder);
}
private void setAdapterDataset(int position) {
mainViewHolder = (ViewHolder) row.getTag();
mainViewHolder.alertBarVerticalViewHol.setBackgroundColor(Color.RED);
mainViewHolder.switchStateTVHol.setTextColor(Color.RED);
mainViewHolder.firstNameTVHol.setText(item.get(position).getFirstName());
mainViewHolder.phoneNumberTVHol.setText(item.get(position).getNumber());
}
public class ViewHolder{
View animatedGifViewHol;
View alertBarVerticalViewHol;
TextView firstNameTVHol;
TextView switchStateTVHol;
TextView phoneNumberTVHol;
}
}