我在列表视图中遇到问题，当我点击加号按钮增量时，但是当我滚动列表视图时，文本已被重置，增量值也在其他项目中更新，我正在使用getter和setter方法保存递增值的数据，我也使用接口来更新片段类中的文本，但它没有更新
Otc_Fragment.Java
public class Otc_Fragment extends Fragment implements CartNumber {
ArrayList<MobiData> otcdatalist;
ListView otc_list;
Otc_Fragment_Adapter otcFragmentAdapter;
TextView cart;
static TextView cartnumber;
RelativeLayout cartbox;
public Otc_Fragment() {
}
public static Fragment getInstance(int position) {
Otc_Fragment otcFragment = new Otc_Fragment();
Bundle bundle = new Bundle();
bundle.putInt("position", position);
otcFragment.setArguments(bundle);
return otcFragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View otcview = inflater.inflate(R.layout.fragments_otc, container, false);
otc_list = (ListView) otcview.findViewById(R.id.otc_list);
cartnumber = (TextView) otcview.findViewById(R.id.cartnumber);
cart = (TextView) otcview.findViewById(R.id.cart);
cartbox= (RelativeLayout) otcview.findViewById(R.id.cartbox);
Typeface cartface = Typeface.createFromAsset(getContext().getAssets(), "fonts/fontawesome.ttf");
cart.setTypeface(cartface);
otcdatalist = new ArrayList<MobiData>();
otcFragmentAdapter = new Otc_Fragment_Adapter(getActivity(), otcdatalist, this);
otc_list.setAdapter(otcFragmentAdapter);
catitems();
return otcview;
}
private void catitems() {
String medurl = getResources().getString(R.string.CommonUrl) + "medicines_catwise.php";
final int position = getArguments().getInt("position", 0);
JsonObjectRequest medobjreq = new JsonObjectRequest(Request.Method.GET, medurl, (String) null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONObject orderobj1 = response.getJSONObject("orders");
JSONArray orderarray = orderobj1.getJSONArray("menu1");
JSONObject orderobj = orderarray.getJSONObject(position);
JSONArray itemsarray = orderobj.getJSONArray("items");
for (int i = 0; i < itemsarray.length(); i++) {
JSONObject itemsobj = itemsarray.getJSONObject(i);
MobiData itemsdata = new MobiData();
itemsdata.setProductidotc(itemsobj.getString("id"));
itemsdata.setProductnameotc(itemsobj.getString("medicine_name"));
itemsdata.setProductpriceotc(itemsobj.getString("price"));
otcdatalist.add(itemsdata);
}
} catch (JSONException e) {
e.printStackTrace();
}
otcFragmentAdapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.d("OtcTabError", String.valueOf(error));
}
});
medobjreq.setRetryPolicy(new DefaultRetryPolicy(5000000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(medobjreq);
}
@Override
public void setcount(String count) {
Toast.makeText(getActivity(), count, Toast.LENGTH_LONG).show();
cartnumber.setText(count);
}
}
Otc_Fragment_Adapter.Java
public class Otc_Fragment_Adapter extends ArrayAdapter<MobiData> {
ArrayList<MobiData> otcproducrlist;
CartNumber cartNumber;
String tid;
SharedPreferences preferences;
SharedPreferences.Editor editorpref;
public Otc_Fragment_Adapter(Context context, ArrayList<MobiData> otcproducrlist, CartNumber cartNumber) {
super(context, R.layout.fragment_otc_row, otcproducrlist);
this.otcproducrlist = otcproducrlist;
this.cartNumber = cartNumber;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final Productholder productholder;
if (convertView == null) {
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.fragment_otc_row, parent, false);
productholder = new Productholder();
productholder.productdecrement = (TextView) convertView.findViewById(R.id.productdecrement);
productholder.productsingle = (TextView) convertView.findViewById(R.id.productsingle);
productholder.productincrement = (TextView) convertView.findViewById(R.id.productincrement);
productholder.productname = (TextView) convertView.findViewById(R.id.productname);
productholder.product_price = (TextView) convertView.findViewById(R.id.product_price);
convertView.setTag(productholder);
} else {
productholder = (Productholder) convertView.getTag();
}
Typeface otctext = Typeface.createFromAsset(getContext().getAssets(), "fonts/fontawesome.ttf");
productholder.productdecrement.setTypeface(otctext);
productholder.productincrement.setTypeface(otctext);
final MobiData productdata = otcproducrlist.get(position);
productholder.productname.setText(productdata.getProductnameotc());
productholder.product_price.setText(productdata.getProductpriceotc());
productdata.setSinglelist(productholder.productsingle.getText().toString());
productholder.productsingle.setText(productdata.getSinglelist());
final String proids = productdata.getProductidotc();
SharedPreferences tempvalue = getContext().getSharedPreferences("datapref", Context.MODE_PRIVATE);
String tempid = tempvalue.getString("tempid", "");
if (tempid != "") {
tid = tempid;
} else {
int min = 65;
int max = 8000;
Random r = new Random();
tid = String.valueOf(r.nextInt(max - min + 1) + min);
preferences = getContext().getSharedPreferences("datapref", Context.MODE_PRIVATE);
editorpref = preferences.edit();
editorpref.putString("tempid", tid);
editorpref.apply();
}
productholder.productincrement.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int plus = Integer.parseInt(productholder.productsingle.getText().toString());
plus++;
productholder.productsingle.setText(String.valueOf(plus));
productdata.setSinglelist(String.valueOf(plus));
SharedPreferences uid = getContext().getSharedPreferences("datapref", Context.MODE_PRIVATE);
String userid = uid.getString("uid", "");
String addcarturl = getContext().getResources().getString(R.string.CommonUrl) + "add_to_cart.php?userid=" + userid + "&mid=" + proids + "&quantity=" + String.valueOf(plus) + "&tempid=" + tid;
Log.d("Addcart", addcarturl);
JsonObjectRequest addreq = new JsonObjectRequest(Request.Method.GET, addcarturl, (String) null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
String count = response.getString("count");
cartNumber.setcount(count);
} catch (JSONException e) {
Log.d("OtcAddCart", String.valueOf(e));
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.d("AddCart", String.valueOf(error));
}
});
addreq.setRetryPolicy(new DefaultRetryPolicy(10000000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
}
});
productholder.productdecrement.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int minus = Integer.parseInt(productholder.productsingle.getText().toString());
if (minus <= 0) {
Toast.makeText(getContext(), "Minimum Quantity is 1", Toast.LENGTH_SHORT).show();
productholder.productsingle.setText(String.valueOf(minus));
productdata.setSinglelist(String.valueOf(minus));
} else {
minus--;
productholder.productsingle.setText(String.valueOf(minus));
productdata.setSinglelist(String.valueOf(minus));
SharedPreferences viewpref = getContext().getSharedPreferences("datapref", Context.MODE_PRIVATE);
String cartduid = viewpref.getString("uid", "");
String cartdtempid = viewpref.getString("tempid", "");
String decremnturl = getContext().getResources().getString(R.string.CommonUrl) + "del_cartitems.php?mid=" + proids + "&userid=" + cartduid + "&tempid=" + cartdtempid;
Log.d("Decremnturl", decremnturl);
JsonObjectRequest decrementreq = new JsonObjectRequest(Request.Method.GET, decremnturl, (String) null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d("Response decremnet", String.valueOf(response));
try {
JSONArray decarray = response.getJSONArray("items");
Log.d("Cartdecrement", String.valueOf(decarray));
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.d("DecrementError", String.valueOf(error));
}
});
decrementreq.setRetryPolicy(new DefaultRetryPolicy(500000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(decrementreq);
}
}
});
return convertView;
}
static class Productholder {
private TextView productname;
private TextView product_price;
private TextView productdecrement;
private TextView productsingle;
private TextView productincrement;
}
}
CartNumber.java
public interface CartNumber {
public void setcount(String count);
}