使用具有a的數組適配器來顯示線性佈局列表。佈局有3個文本字段和一個隱藏按鈕,當點擊列表項時顯示。我試圖做的是將一個onclicklistener附加到按鈕,將從數組列表/適配器中刪除該行並更新數據集。我有以下代碼:無法更新ArrayAdapter中的數據
public class CheckAdapter extends ArrayAdapter<Check> {
Context context;
int layoutResourceId;
ArrayList<Check> data = null;
public CheckAdapter(Context context, int resource, ArrayList<Check> objects) {
super(context, resource, objects);
this.context = context;
this.layoutResourceId = resource;
this.data = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if(convertView == null){
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
convertView = inflater.inflate(layoutResourceId, parent, false);
holder = new ViewHolder(convertView.findViewById(R.id.checklistRoot));
holder.checkName = (TextView) convertView.findViewById(R.id.checklistname);
holder.checkNumber = (TextView) convertView.findViewById(R.id.checklistnumber);
holder.checkTotal = (TextView) convertView.findViewById(R.id.checklisttotal);
holder.deleteButton = (Button) convertView.findViewById(R.id.deletecheck);
holder.swipeButtons();
convertView.setTag(holder);
}
else
{
holder = (ViewHolder)convertView.getTag();
holder.swipeButtons();
}
String name = data.get(position).getName();
Double total = data.get(position).getAmmount();
Long number = data.get(position).getCheckNumber();
holder.checkName.setText(name);
holder.checkNumber.setText(number.toString());
holder.checkTotal.setText(total.toString());
holder.deleteButton.setTag(position);
holder.deleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Integer position = (Integer) view.getTag();
Log.d("Check Adapter", "Button Clicked: " + position);
data.remove(position);
notifyDataSetChanged();
}
});
return convertView;
}
static class ViewHolder{
TextView checkName;
TextView checkNumber;
TextView checkTotal;
Button deleteButton;
View rootView;
ViewHolder(View rootView) {
this.rootView = rootView;
}
public void swipeButtons(){
rootView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
deleteButton.setVisibility(View.VISIBLE);
return false;
}
});
}
}
}
我的日誌顯示我有正確的位置被髮送到data.remove(位置);然而,ListView似乎沒有更新,數據似乎仍然存在。有什麼建議麼?
非常感謝!
ListView listvw =(ListView)parent; listvw.invalidateViews(); – 2014-10-02 05:36:12
你可以使用接口並在arrayadapter構造函數中傳遞它的實例。在deletebutton clicklisterner中,您可以調用此接口並向活動發送消息,在活動中,您可以在adapater實例上調用notifyDataSetChanged()。 – 2014-10-02 05:59:12