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Ich habe eine Schnittstelle in ProductListAdapter Klasse implementiert, die eine Liste Adapter ist. Elemente in dieser Liste haben drei Eingabefelder. Um diese Werte im Auge zu behalten, habe ich eine Klasse MyCustomEditTextListener implementiert, die eine TextWatcher Klasse erweitert. Diese Klasse erstellt einfach eine Array-Liste von bearbeiteten Daten. Ich möchte einen Verweis auf die Array-Liste jedes Mal erhalten, wenn sie sich von dem Fragment ändert, das die Listenansicht enthält. Dafür habe ich DataChangedListener implementiertSo Instantiieren Schnittstelle von asynctask in Fragment
ProductListAdapter.java
public class ProductListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private LayoutInflater inflater;
private ArrayList<Products> listData;
private ArrayList<Products> editedData;
private Context context;
private DataChangedListener dataChangedListener;
private static final int ITEM = 0;
private static final int LOADING = 1;
private static final int QUANTITY = 5;
private static final int FREE_QUANTITY = 10;
private static final int DISCOUNT = 15;
public ProductListAdapter(ArrayList<Products> listData, ArrayList<Products> editedData, Context context) {
this.listData = listData;
this.context = context;
this.editedData = editedData;
inflater = LayoutInflater.from(this.context);
}
public void updateData(ArrayList<Products> data) {
this.listData = data;
notifyDataSetChanged();
}
public void setDataChangedListener(DataChangedListener listener) {
this.dataChangedListener = listener;
}
@Override
public int getItemViewType(int position) {
return listData.get(position) == null ? LOADING : ITEM;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RecyclerView.ViewHolder viewHolder = null;
switch (viewType) {
case ITEM:
viewHolder = getViewHolder(parent, inflater);
break;
case LOADING:
View v2 = inflater.inflate(R.layout.list_footer, parent, false);
viewHolder = new LoadingVH(v2);
break;
}
return viewHolder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
Products productObject = listData.get(position);
switch (getItemViewType(position)) {
case ITEM:
for(int i=0; i<editedData.size(); i++){
if(productObject.getProductId().equals(editedData.get(i).getProductId())){
productObject.setQuantity(editedData.get(i).getQuantity());
productObject.setFreeQuantity(editedData.get(i).getFreeQuantity());
productObject.setDiscount(editedData.get(i).getDiscount());
}
}
String productName = productObject.getProductName();
String quantityValue = productObject.getQuantity();
String freeQuantityValue = productObject.getFreeQuantity();
String discountValue = productObject.getDiscount();
String quantityInHand = productObject.getQuantityInHand();
String price = productObject.getWholeSalePrice();
ContentViewHolder movieVH = (ContentViewHolder) holder;
movieVH.productName.setText(productName);
movieVH.stock.setText(quantityInHand);
movieVH.price.setText("Rs."+price);
movieVH.quantityEditTextListener.updatePosition(movieVH.getLayoutPosition());
movieVH.quantity.setText(quantityValue);
movieVH.freeQuantityEditTextListener.updatePosition(movieVH.getLayoutPosition());
movieVH.freeQuantity.setText(freeQuantityValue);
movieVH.discountEditTextListener.updatePosition(movieVH.getLayoutPosition());
movieVH.discount.setText(discountValue);
movieVH.quantity.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
return false;
}
});
break;
case LOADING:
//Do nothing
break;
}
}
@Override
public int getItemCount() {
return listData == null ? 0 : listData.size();
}
@NonNull
private RecyclerView.ViewHolder getViewHolder(ViewGroup parent, LayoutInflater inflater) {
RecyclerView.ViewHolder viewHolder;
View view = inflater.inflate(R.layout.custom_product_list_item, parent, false);
viewHolder = new ContentViewHolder(view, new MyCustomEditTextListener()
, new MyCustomEditTextListener(), new MyCustomEditTextListener());
return viewHolder;
}
/**
* View holder for main container
*/
public class ContentViewHolder extends RecyclerView.ViewHolder{
private TextView productName;
private EditText quantity;
private EditText freeQuantity;
private EditText discount;
private TextView stock;
private TextView price;
private MyCustomEditTextListener quantityEditTextListener;
private MyCustomEditTextListener freeQuantityEditTextListener;
private MyCustomEditTextListener discountEditTextListener;
public ContentViewHolder(View itemView, MyCustomEditTextListener textListener
, MyCustomEditTextListener textListener2, MyCustomEditTextListener textListener3) {
super(itemView);
productName = (TextView) itemView.findViewById(R.id.product_name_data);
quantity = (EditText) itemView.findViewById(R.id.quantity_1_edit_text);
freeQuantity = (EditText) itemView.findViewById(R.id.quantity_2_edit_text);
discount = (EditText) itemView.findViewById(R.id.quantity_3_edit_text);
stock = (TextView) itemView.findViewById(R.id.quantity_in_hand_value);
price = (TextView) itemView.findViewById(R.id.price_value);
quantityEditTextListener = textListener;
quantityEditTextListener.setEditTextType(QUANTITY);
freeQuantityEditTextListener = textListener2;
freeQuantityEditTextListener.setEditTextType(FREE_QUANTITY);
discountEditTextListener = textListener3;
discountEditTextListener.setEditTextType(DISCOUNT);
this.quantity.addTextChangedListener(quantityEditTextListener);
this.freeQuantity.addTextChangedListener(freeQuantityEditTextListener);
this.discount.addTextChangedListener(discountEditTextListener);
}
}
/**
* View holder to display loading list item
*/
protected class LoadingVH extends RecyclerView.ViewHolder {
public LoadingVH(View itemView) {
super(itemView);
}
}
/**
* textWatcher for to keep track of changed data.
*/
private class MyCustomEditTextListener implements TextWatcher {
private int position;
private int type;
public void updatePosition(int position) {
this.position = position;
}
public void setEditTextType(int type) {
this.type = type;
}
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
// no op
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
if (type == QUANTITY) {
listData.get(position).setQuantity(charSequence.toString());
} else if (type == FREE_QUANTITY) {
listData.get(position).setFreeQuantity(charSequence.toString());
} else if (type == DISCOUNT) {
listData.get(position).setDiscount(charSequence.toString());
}
}
@Override
public void afterTextChanged(Editable s) {
boolean matchFound = false;
if(s.toString().length()>0){
for (int i=0;i<editedData.size();i++){
if(editedData.get(i).getProductId()
.equals(listData.get(position).getProductId())){
matchFound = true;
if (type == QUANTITY) {
editedData.get(i).setQuantity(s.toString());
} else if (type == FREE_QUANTITY) {
editedData.get(i).setFreeQuantity(s.toString());
} else if (type == DISCOUNT) {
editedData.get(i).setDiscount(s.toString());
}
}
}
if(!matchFound){
editedData.add(listData.get(position));
}
if(dataChangedListener!=null){
dataChangedListener.onDataChanged(editedData);
}
}
}
}
public interface DataChangedListener{
void onDataChanged(ArrayList<Products> editedData);
}
In meinem OrderEditFragment ich versuche, diese Schnittstelle zu implementieren notwendigen Berechnungen zu tun.
OrderEditFragment.java
public class OrderEditFragment extends Fragment implements ProductListAdapter.DataChangedListener {
private LinearLayoutManager layoutManager;
private RecyclerView productRecyclerView;
private static ProductListAdapter productListAdapter;
private String employeeId;
private static ArrayList<Products> editedData;
private static ArrayList<Products> productsData;
private SharedPreferences sharedpreferences;
private final static OkHttpClient client = new OkHttpClient();
public OrderEditFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View inflate = inflater.inflate(R.layout.fragment_order_edit, container, false);
initComponents(inflate);
return inflate;
}
private void initComponents(View view) {
productRecyclerView = (RecyclerView) view.findViewById(R.id.product_edit_recycler_view);
progressView = (CircularProgressView) view.findViewById(R.id.progress_view);
layoutManager = new LinearLayoutManager(getContext());
sharedpreferences = getActivity().getSharedPreferences("dgFashionPref", Context.MODE_PRIVATE);
employeeId = sharedpreferences.getString("employee_id","");
productsData = new ArrayList<>();
editedData = new ArrayList<>();
isLoading = false;
isLastPage = false;
isFirstLoad = true;
isSearch = false;
new GetProductListGetRequest(getContext(), productRecyclerView, layoutManager)
.execute(RestConnection.PRODUCT_LIST_GET
+ RestConnection.CUSTOMER_ID_FOR_NAME + employeeId);
}
@Override
public void onDataChanged(ArrayList<Products> editedData) {
Log.d(TAG,editedData.toString());
}
/**
* AsyncTask class which handel the GET request to get product list
**/
public static class GetProductListGetRequest extends AsyncTask<String, Void, String>{
private WeakReference<Context> ActivityWeakReference;
private WeakReference<RecyclerView> recyclerViewWeakReference;
private WeakReference<RecyclerView.LayoutManager> layoutManagerWeakReference;
public GetProductListGetRequest(Context activity, RecyclerView recyclerView
, RecyclerView.LayoutManager layoutManager) {
ActivityWeakReference = new WeakReference<>(activity);
recyclerViewWeakReference = new WeakReference<>(recyclerView);
layoutManagerWeakReference = new WeakReference<>(layoutManager);
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
String urlEndPoint = params[0];
Request request = new Request.Builder()
.url(RestConnection.API_BASE + urlEndPoint)
.build();
try {
Response response = client.newCall(request).execute();
return response.body().string();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String response) {
if(productsData.size()>0){
productsData.remove(productsData.size() - 1);
}
JSONArray responseBody;
try {
if (response != null && ActivityWeakReference.get() != null) {
responseBody = new JSONArray(response);
for (int i = 0; i < responseBody.length(); i++) {
JSONObject row = responseBody.getJSONObject(i);
String productId = row.getString("ProductID");
String productName = row.getString("Name");
String unit = row.getString("Unit");
String wholeSalePrice = row.getString("WSalePrice");
String packSize = row.getString("PackSize");
String retailPrice = row.getString("RetailPrice");
String costPrice = row.getString("CostPrice");
String qtyInHand = row.getString("QtyInHand");
Products productObj = new Products();
productObj.setProductName(productName);
productObj.setProductId(productId);
productObj.setUnit(unit);
productObj.setWholeSalePrice(wholeSalePrice);
productObj.setPackSize(packSize);
productObj.setRetailPrice(retailPrice);
productObj.setCostPrice(costPrice);
productObj.setQuantityInHand(qtyInHand);
productsData.add(productObj);
}
productListAdapter = new ProductListAdapter(productsData, editedData, ActivityWeakReference.get());
productListAdapter.setDataChangedListener(ActivityWeakReference.get());
recyclerViewWeakReference.get().setAdapter(productListAdapter);
recyclerViewWeakReference.get().setLayoutManager(layoutManagerWeakReference.get());
recyclerViewWeakReference.get().addItemDecoration(new RecyclerViewDivider(2));
} else {
Toast.makeText(ActivityWeakReference.get(), "Can't connect to the server", Toast.LENGTH_LONG).show();
}
} catch (JSONException e)
{
Log.d(TAG, "Get customer details onPostExecute :" + e.getLocalizedMessage());
}
}
}
/**
* A class that define space between list items
*/
private static class RecyclerViewDivider extends RecyclerView.ItemDecoration {
int space;
public RecyclerViewDivider(int space) {
this.space = space;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
outRect.bottom = space;
if (parent.getChildLayoutPosition(view) == 0) {
outRect.top = space;
}
}
}
}
Wie Sie sehen, ich versuche Schnittstelle innerhalb AsyncTask Klasse erstellt bald nach durch den Aufruf setDataChangedListener(DataChangedListener listener); Methode productListAdapter Objekt zu instanziiert. Aber es hat ActivityWeakReference.get() nicht als gültigen Parameter verwendet. Ich habe schon mal mit dem Listenadapter eine dünnere Sache gemacht, um das benutzerdefinierte Ereignis onListItemClick zur Aktivität zu bringen. In diesen Fällen funktioniert ActivityWeakReference.get() gut. Ich denke, das passiert, weil ich in einem Fragment bin, aber ich kann nicht herausfinden, welches Objekt ich weitergeben soll. Ich muss Adapter innerhalb AsyncTask schaffen, weil ich Seitennummerierung für Listenansicht implementiert habe. Ich entferne diese Codes, um diesen Beitrag kurz zu machen. Bitte helfen Sie.