我想知道如何从 Recycler View 适配器获取编辑文本的位置。我用过 Card View with in that horizontal Linear Layout 有三个view TextView，EditText view和TextView。 我想从 Recycler View Adapter 中的 Textwatcher 获取特定的 EditText Position。
适配器:
public class CartlistAdapter extends RecyclerView.Adapter < CartlistAdapter.ViewHolder > {
private ArrayList < CartItemoriginal > cartlistadp;
private ArrayList < Cartitemoringinaltwo > cartlistadp2;
DisplayImageOptions options;
private Context context;
public static final String MyPREFERENCES = "MyPrefs";
public static final String MYCARTPREFERENCE = "CartPrefs";
public static final String MyCartQtyPreference = "Cartatyid";
SharedPreferences.Editor editor;
SharedPreferences shared,
wishshared;
SharedPreferences.Editor editors;
String pos,
qtyDelete;
String date;
String currentDateandTime;
private static final int VIEW_TYPE_ONE = 1;
private static final int VIEW_TYPE_TWO = 2;
private static final int TYPE_HEADER = 0;
private Double orderTotal = 0.00;
DecimalFormat df = new DecimalFormat("0");
Double extPrice;
View layout,
layouts;
SharedPreferences sharedPreferences;
SharedPreferences.Editor QutId;
boolean flag = false;
public CartlistAdapter() {
}
public CartlistAdapter(ArrayList < CartItemoriginal > cartlistadp, Context context) {
this.cartlistadp = cartlistadp;
this.cartlistadp2 = cartlistadp2;
this.context = context;
options = new DisplayImageOptions.Builder().cacheOnDisk(true).cacheInMemory(true).showImageOnLoading(R.drawable.b2)
.showImageForEmptyUri(R.drawable.b2).build();
if (YelloPage.imageLoader.isInited()) {
YelloPage.imageLoader.destroy();
}
YelloPage.imageLoader.init(ImageLoaderConfiguration.createDefault(context));
}
public int getItemViewType(int position) {
if (cartlistadp.size() == 0) {
Toast.makeText(context, String.valueOf(cartlistadp), Toast.LENGTH_LONG).show();
return VIEW_TYPE_TWO;
}
return VIEW_TYPE_ONE;
}
@Override
public CartlistAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int position) {
ViewHolder viewHolder = null;
switch (position) {
case VIEW_TYPE_TWO:
View view2 = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.activity_cart, viewGroup, false);
viewHolder = new ViewHolder(view2);
// return view holder for your placeholder
break;
case VIEW_TYPE_ONE:
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.cartitemrow, viewGroup, false);
viewHolder = new ViewHolder(view);
// return view holder for your normal list item
break;
}
return viewHolder;
}
@Override
public void onBindViewHolder(CartlistAdapter.ViewHolder viewHolder, int position) {
viewHolder.productnames.setText(cartlistadp.get(position).getProductname());
viewHolder.cartalisname.setText(cartlistadp.get(position).getAliasname());
viewHolder.cartprice.setText("Rs" + " " + cartlistadp.get(position).getPrice());
viewHolder.cartdelivery.setText(cartlistadp.get(position).getDelivery());
viewHolder.cartshippin.setText(cartlistadp.get(position).getShippincharge());
viewHolder.cartsellername.setText(cartlistadp.get(position).getSellername());
viewHolder.Error.setText(cartlistadp.get(position).getError());
viewHolder.qty.setTag(cartlistadp.get(position));
if (cartlistadp.get(position).getQty() != 0) {
viewHolder.qty.setText(String.valueOf(cartlistadp.get(position).getQty()));
} else {
viewHolder.qty.setText("0");
}
YelloPage.imageLoader.displayImage(cartlistadp.get(position).getProductimg(), viewHolder.cartitemimg, options);
viewHolder.qty.setTag(R.id.quantity, position);
}
@Override
public int getItemCount() {
return cartlistadp.size();
}
public long getItemId(int position) {
return position;
}
public Object getItem(int position) {
return cartlistadp.get(position);
}
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView productnames, cartalisname, cartprice, cartdelivery, cartshippin, cartsellername, Error, total;
private ImageView cartitemimg;
private ImageButton wishbtn, removebtn;
private LinearLayout removecart, movewishlist;
private CardView cd;
private EditText qty;
private ImageView WishImg;
public ViewHolder(final View view) {
super(view);
productnames = (TextView) view.findViewById(R.id.cartitemname);
cartalisname = (TextView) view.findViewById(R.id.cartalias);
cartprice = (TextView) view.findViewById(R.id.CartAmt);
cartdelivery = (TextView) view.findViewById(R.id.cartdel);
cartshippin = (TextView) view.findViewById(R.id.shippingcrg);
cartsellername = (TextView) view.findViewById(R.id.cartSellerName);
cartitemimg = (ImageView) view.findViewById(R.id.cartimg);
Error = (TextView) view.findViewById(R.id.error);
removecart = (LinearLayout) view.findViewById(R.id.removecart);
movewishlist = (LinearLayout) view.findViewById(R.id.movewishlist);
WishImg = (ImageView) view.findViewById(R.id.wishimg);
qty = (EditText) view.findViewById(R.id.quantity);
String pid, qid;
sharedPreferences = view.getContext().getSharedPreferences(MYCARTPREFERENCE, Context.MODE_PRIVATE);
QutId = sharedPreferences.edit();
Log.d("Position checking1 ---", String.valueOf(getAdapterPosition()));
MyTextWatcher textWatcher = new MyTextWatcher(view, qty, getAdapterPosition());
// qty.addTextChangedListener(new MyTextWatcher(view,getAdapterPosition()));
qty.addTextChangedListener(textWatcher);
qty.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
qty.setSelection(qty.getText().length());
return false;
}
});
wishshared = view.getContext().getSharedPreferences(MyPREFERENCES, context.MODE_PRIVATE);
editors = view.getContext().getSharedPreferences(MyPREFERENCES, context.MODE_PRIVATE).edit();
shared = view.getContext().getSharedPreferences(MYCARTPREFERENCE, context.MODE_PRIVATE);
editor = view.getContext().getSharedPreferences(MYCARTPREFERENCE, context.MODE_PRIVATE).edit();
cd = (CardView) view.findViewById(R.id.cv);
productnames.setSingleLine(false);
productnames.setEllipsize(TextUtils.TruncateAt.END);
productnames.setMaxLines(2);
totalPrice();
view.setClickable(true);
}
public class InputFilterMinMax implements InputFilter {
private int min, max;
public InputFilterMinMax(int min, int max) {
this.min = min;
this.max = max;
}
public InputFilterMinMax(String min, String max) {
this.min = Integer.parseInt(min);
this.max = Integer.parseInt(max);
}
@Override
public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
try {
int input = Integer.parseInt(dest.toString() + source.toString());
if (isInRange(min, max, input))
return null;
} catch (NumberFormatException nfe) {}
return "";
}
private boolean isInRange(int a, int b, int c) {
return b > a ? c >= a && c <= b : c >= b && c <= a;
}
}
private class MyTextWatcher implements TextWatcher {
private View view;
private EditText editText;
//private int position;
private MyTextWatcher(View view, EditText editText, int adapterPosition) {
this.view = view;
this.editText = editText;
// this.position = adapterPosition;
// cartlistadp.get(position).getQty() = Integer.parseInt((Caption.getText().toString()));
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
//do nothing
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
EditText qtyView = (EditText) view.findViewById(R.id.quantity);
int position = (int) qtyView.getTag(R.id.quantity);
Log.i("editextpostion", String.valueOf(position));
}
public void afterTextChanged(Editable s) {
DecimalFormat df = new DecimalFormat("0");
String qtyString = s.toString();
int quantity = qtyString.equals("") ? 0 : Integer.valueOf(qtyString);
String quty = String.valueOf(quantity);
EditText qtyView = (EditText) view.findViewById(R.id.quantity);
CartItemoriginal product = (CartItemoriginal) qtyView.getTag();
Log.d("postion is qtytag", "Position is: " + product);
qtyView.setFilters(new InputFilter[] {
new InputFilterMinMax(product.getMinquantity(), product.getMaxquantity())
});
if (product.getQty() != quantity) {
Double currPrice = product.getExt();
Double price = Double.parseDouble(product.getPrice());
int maxaty = Integer.parseInt(product.getMaxquantity());
int minqty = Integer.parseInt(product.getMinquantity());
if (quantity < maxaty) {
extPrice = quantity * price;
} else {
Toast.makeText(context, "Sorry" + " " + " " + "we are shipping only" + " " + " " + maxaty + " " + " " + "unit of quantity", Toast.LENGTH_LONG).show();
}
Double priceDiff = Double.valueOf(df.format(extPrice - currPrice));
product.setQty(quantity);
product.setExt(extPrice);
TextView ext = (TextView) view.findViewById(R.id.CartAmt);
if (product.getQty() != 0) {
ext.setText("Rs." + " " + df.format(product.getExt()));
} else {
ext.setText("0");
}
if (product.getQty() != 0) {
qtyView.setText(String.valueOf(product.getQty()));
} else {
qtyView.setText("");
}
totalPrice();
}
return;
}
}
private void totalPrice() {
int price = 0;
for (int j = 0; j < cartlistadp.size(); j++) {
price += Integer.parseInt(cartlistadp.get(j).getPrice()) * (cartlistadp.get(j).getQty());
String totalprice = String.valueOf(price);
String count = String.valueOf(cartlistadp.size());
CartItems.Totalamt.setText(totalprice);
CartItems.cartcount.setText("(" + count + ")");
CartItems.carttotalcount.setText("(" + count + ")");
}
}
}
}
提前致谢。
最佳答案
在 Adapter 的 onBindViewHolder 方法中，像这样为 EditText 设置标签:
holder.editText.setTag(position);
然后在您的 ViewHolder 中，将 TextWatcher 添加到您的 EditText
public static class ViewHolder extends RecyclerView.ViewHolder {
EditText editText ;
public ViewHolder(View itemView) {
super(itemView);
editText = itemView.findViewById(R.id.editText);
MyTextWatcher textWatcher = new MyTextWatcher(editText);
editText.addTextChangedListener(textWatcher);
}
}
这是您的 TextWatcher:
public class MyTextWatcher implements TextWatcher {
private EditText editText;
public MyTextWatcher(EditText editText) {
this.editText = editText;
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
int position = (int) editText.getTag();
// Do whatever you want with position
}
@Override
public void afterTextChanged(Editable s) {
}
}
NOTE: Make sure you call
setTagmethod from yourEditTextbefore callingsetTextmethod, else it will throwNullPointerException. Or alternatively you can addnullcheck when callinggetTagmethod.
更新 1
如果您的 EditText 已经有另一个标签集，请使用 ID 来识别标签。例如设置标签时使用此:
holder.editText.setTag(R.id.editText, position);
其中 R.id.editText 是您的任何资源的有效 ID(有关详细信息，请参阅 documentation)。
还有在获取值(value)时:
int position = (int) editText.getTag(R.id.editText);
关于android - 如何在 android 中使用 Text Watcher 从 Recycler View 适配器获取编辑文本位置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37915677/