我检查了大部分地方，但我无法得到这个问题的确切答案。
功能问题： getView
问题是什么：如果条件成立，
mproduct.remove（（位置））; 的 notifyDataSetChanged（）;
这两个声明都假设有效。 //这里mproduct是ArrayList的对象; 如果我写Log.e（）;它显示promt消息。
提前致谢。
{
public class DataAdapterCheckOut extends BaseAdapter {
Context context;
ArrayList<CheckOutProduct> mproduct;
public DataAdapterCheckOut(Context context, ArrayList<CheckOutProduct>
product){
// super(context, R.layout.activity_list_product, product);
this.context=context;
this.mproduct=product;
}
public class Holder{
TextView nameFV, mrpFV, our_priceFV, weightFv, unitFV, countFV;
ImageView pic;
int countTemp=1,mrp=0,ourPrice=0;
String name;
Button btnAdd, btnSubstract, btnAddCart;
}
@Override
public int getCount() {
return mproduct.size();
}
@Override
public Object getItem(int position) {
return mproduct.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final CheckOutProduct checkOutProduct = mproduct.get(position);
// Check if an existing view is being reused, otherwise inflate the view
SharedPreferences prefs = context.getSharedPreferences("MNA",
Context.MODE_PRIVATE);
String personalEmail = prefs.getString("personalEmail", null);
String mobTemp = prefs.getString("MNAF", null);
final Holder viewHolder; // view lookup cache stored in tag
if (convertView == null) {
viewHolder = new Holder();
LayoutInflater inflater = LayoutInflater.from(context);
convertView = inflater.inflate(R.layout.activity_list_product,
parent, false);
viewHolder.nameFV = (TextView)
convertView.findViewById(R.id.txtNameViewer);
//viewHolder.idFV = (TextView)
convertView.findViewById(R.id.txtIdViewer);
viewHolder.mrpFV = (TextView)
convertView.findViewById(R.id.txtMrpViewer);
viewHolder.our_priceFV = (TextView)
convertView.findViewById(R.id.txtOurPriceViewer);
viewHolder.weightFv = (TextView)
convertView.findViewById(R.id.txtWeightViewer);
viewHolder.unitFV = (TextView)
convertView.findViewById(R.id.txtUnitViewer);
viewHolder.countFV = (TextView)
convertView.findViewById(R.id.txtViewProductCount);
viewHolder.pic = (ImageView)
convertView.findViewById(R.id.imgView);
viewHolder.btnAdd = (Button)
convertView.findViewById(R.id.buttonAdd);
viewHolder.btnSubstract = (Button)
convertView.findViewById(R.id.buttonSubstract);
viewHolder.btnAddCart = (Button)
convertView.findViewById(R.id.buttonAddCart);
convertView.setTag(viewHolder);
} else {
viewHolder = (Holder) convertView.getTag();
}
viewHolder.nameFV.setText(checkOutProduct.get_name());
viewHolder.name = checkOutProduct.get_name();
viewHolder.mrpFV.setText("MRP : " +
checkOutProduct.getMrp());
viewHolder.mrp = checkOutProduct.getMrp();
viewHolder.our_priceFV.setText("Our Price : " +
checkOutProduct.getOurPrice());
viewHolder.ourPrice = checkOutProduct.getOurPrice();
viewHolder.weightFv.setText(checkOutProduct.getWeight());
viewHolder.unitFV.setText(" " + checkOutProduct.getUnit());
viewHolder.pic.setImageBitmap(convertToBitmap(checkOutProduct.getImage()));
viewHolder.countFV.setText("" +
checkOutProduct.get_quantity());
viewHolder.countTemp = checkOutProduct.get_quantity();
viewHolder.btnAdd.setOnClickListener(new
View.OnClickListener() {
@Override
public void onClick(View v) {
viewHolder.countTemp++;
viewHolder.countFV.setText("" +
viewHolder.countTemp);
}
});
viewHolder.btnSubstract.setOnClickListener(new
View.OnClickListener() {
@Override
public void onClick(View v) {
viewHolder.countTemp--;
if (viewHolder.countTemp >= 1)
viewHolder.countFV.setText("" +
viewHolder.countTemp);
else {
Toast.makeText(context, "Sorry Item Count at
least 1", Toast.LENGTH_LONG).show();
viewHolder.countTemp = 1;
}
}
});
viewHolder.btnAddCart.setOnClickListener(new
View.OnClickListener() {
@Override
public void onClick(View v) {
Log.e("B", "Added into Cart");
SharedPreferences prefs =
context.getSharedPreferences("MNA", Context.MODE_PRIVATE);
String personalEmail =
prefs.getString("personalEmail", null);
CheckOutDBHelper checkOutDBHelper1 = new
CheckOutDBHelper(context);
checkOutDBHelper1.addCheckOutInformation(new
CheckOutProduct(personalEmail, checkOutProduct.get_name(),
checkOutProduct.getID(), checkOutProduct.getMrp(),
checkOutProduct.getOurPrice(), checkOutProduct.getWeight(),
checkOutProduct.getUnit(), checkOutProduct.getImage(),
viewHolder.countTemp));
}
});
UserDBHelper userDBHelper = new UserDBHelper(context);
if(personalEmail!=null&&!personalEmail.equals(checkOutProduct.get_gmail()))
{
mproduct.remove(position);
notifyDataSetChanged();
}
if (mobTemp!=null&&!userDBHelper.getEmailId(mobTemp).equals(checkOutProduct.get_gmail())){
mproduct.remove((`enter code here`position));
notifyDataSetChanged();
enter code here
}
return convertView;
}
//get bitmap image from byte array
private Bitmap convertToBitmap(byte[] b){
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
}
}