[英]Getting value of EditText in Activity from ListView
我的LisiViewAdapter類是這個
public class ListViewAdapter3 extends BaseAdapter {
Activity context;
String productCode[];
String productName[];
String productType[];
String productPrice[];
String lastFourOrder[];
String productId[];
public ListViewAdapter3(Activity context, String productCode[],
String productName[], String productType[], String productPrice[],
String lastFourOrder[], String productId[]) {
super();
this.context = context;
this.productCode = productCode;
this.productName = productName;
this.productType = productType;
this.productPrice = productPrice;
this.lastFourOrder = lastFourOrder;
this.productId = productId;
}
public int getCount() {
// TODO Auto-generated method stub
return productName.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
private class ViewHolder {
TextView tvproductname;
TextView tvproducttype;
TextView tvproductunit;
TextView tvproductprice;
TextView tvproductorder;
ImageView ivup1;
ImageView ivdown1;
EditText stepper_display;
int defaultNumber = 0;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.collection2, null);
holder = new ViewHolder();
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tvproductname = (TextView) convertView
.findViewById(R.id.tvproduct);
holder.tvproducttype = (TextView) convertView
.findViewById(R.id.tvprodtype);
holder.tvproductunit = (TextView) convertView
.findViewById(R.id.tvprodunit);
holder.tvproductprice = (TextView) convertView
.findViewById(R.id.tvprice);
holder.tvproductorder = (TextView) convertView.findViewById(R.id.tvL40);
holder.ivup1 = (ImageView) convertView.findViewById(R.id.ivup1);
holder.ivdown1 = (ImageView) convertView.findViewById(R.id.ivdown1);
holder.stepper_display = (EditText) convertView
.findViewById(R.id.etorderqty);
holder.stepper_display.setText("" + holder.defaultNumber);
holder.ivup1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String s = holder.stepper_display.getText().toString();
if (s.equals("0")) {
holder.defaultNumber = 0;
holder.defaultNumber++;
} else {
// decrem_btn.setClickable(true);
holder.defaultNumber++;
}
holder.ivdown1.setClickable(true);
String currentValue = Integer.toString(holder.defaultNumber);
holder.stepper_display.setText(currentValue);
}
});
holder.ivdown1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String s = holder.stepper_display.getText().toString();
// System.out.println("s=====" + s);
if (s.equals("0")) {
// System.out.println("ffffffffffffffffffffffffffff");
holder.ivdown1.setClickable(false);
holder.defaultNumber = 0;
} else {
// decrem_btn.setClickable(true);
holder.defaultNumber--;
}
if (holder.defaultNumber == 0) {
holder.ivdown1.setClickable(false);
}
String currentValue = Integer.toString(holder.defaultNumber);
holder.stepper_display.setText(currentValue);
}
});
holder.tvproductname.setText(productName[position]);
holder.tvproducttype.setText(productType[position]);
holder.tvproductunit.setText("");
holder.tvproductprice.setText(productPrice[position]);
holder.tvproductorder.setText(lastFourOrder[position]);
return convertView;
}
}
在我的Activity類中,我得到了EditText的值
for (int i = 0; i < list.getAdapter().getCount(); i++) {
View view = list.getChildAt(i);
EditText editText = (EditText) view.findViewById(R.id.etorderqty);
System.out.println(i+" A:"+editText.getText().toString());
}
清單的大小是5。 但是我沒有從所有EditText中獲取數據,我只得到了Edit Text的四個值。 沒有得到最后的價值。 請幫忙。
我認為您不應獲取此類數據。 將data List
放入適配器以存儲數據。 您應該知道,當滾動該列表視圖時,上部視圖將被重用,因此所有數據都將丟失。 您可能只有五個項目,但是使用數據列表存儲數據是一個很好的主意,可以使用從適配器中get data
。
在我們的for循環中,您只會得到四個元素,因為您的移動屏幕上可能只會顯示四個元素,或者移動屏幕只能顯示四個元素。 屏幕上其他元素仍未膨脹。 為此,您需要首先了解如何使用ADAPTER進行LISTVIEW的工作。
如果您將listView與適配器一起使用,則屏幕僅顯示四個(或作為屏幕容量的前一項),因為listView不會為傳遞給適配器的所有元素放置位置。 它為屏幕上顯示的元素留出空間。
上下滾動時,將為下一個元素和上一個元素存儲在RECYCLER中。
請通過適配器了解Listview的基本知識,您將了解其他適配器的工作原理。
希望你能理解。
http://lucasr.org/2012/04/05/performance-tips-for-androids-listview/
使用此鏈接了解
終於得到了解決方案! 這是我的適配器類
public class ListViewAdapter3 extends BaseAdapter {
Activity context;
String productCode[];
String productName[];
String productType[];
String productPrice[];
String lastFourOrder[];
String productId[];
// Created String Array Here
private final String[] valueList;
public ListViewAdapter3(Activity context, String productCode[],
String productName[], String productType[], String productPrice[],
String lastFourOrder[], String productId[]) {
super();
this.context = context;
this.productCode = productCode;
this.productName = productName;
this.productType = productType;
this.productPrice = productPrice;
this.lastFourOrder = lastFourOrder;
this.productId = productId;
//initialization of array
valueList = new String[productCode.length];
}
public int getCount() {
// TODO Auto-generated method stub
return productName.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
public class ViewHolder {
TextView tvproductname;
TextView tvproducttype;
TextView tvproductunit;
TextView tvproductprice;
TextView tvproductorder;
TextView tvproductid;
ImageView ivup1;
ImageView ivdown1;
EditText stepper_display;
int defaultNumber = 0;
}
@Override
public int getItemViewType(int position) {
return position;
}
@Override
public int getViewTypeCount() {
return 500;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
//System.out.println("convertView Null ="+convertView);
convertView = inflater.inflate(R.layout.collection2, null);
holder = new ViewHolder();
holder.tvproductname = (TextView) convertView.findViewById(R.id.tvproduct);
holder.tvproducttype = (TextView) convertView.findViewById(R.id.tvprodtype);
holder.tvproductunit = (TextView) convertView.findViewById(R.id.tvprodunit);
holder.tvproductprice = (TextView) convertView.findViewById(R.id.tvprice);
holder.tvproductorder = (TextView) convertView.findViewById(R.id.tvL40);
holder.tvproductid = (TextView) convertView.findViewById(R.id.tvproductid);
convertView.setTag(holder);
} else {
//System.out.println("convertView NOt Null ="+convertView);
holder = (ViewHolder) convertView.getTag();
}
holder.ivup1 = (ImageView) convertView.findViewById(R.id.ivup1);
holder.ivdown1 = (ImageView) convertView.findViewById(R.id.ivdown1);
holder.stepper_display = (EditText) convertView.findViewById(R.id.etorderqty);
holder.stepper_display.setText("" + holder.defaultNumber);
holder.ivup1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String s = holder.stepper_display.getText().toString();
if (s.equals("0")) {
holder.defaultNumber = 0;
holder.defaultNumber++;
} else {
// decrem_btn.setClickable(true);
holder.defaultNumber++;
}
holder.ivdown1.setClickable(true);
holder.stepper_display.setText(Integer.toString(holder.defaultNumber));
}
});
holder.ivdown1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String s = holder.stepper_display.getText().toString();
// System.out.println("s=====" + s);
if (s.equals("0")) {
holder.ivdown1.setClickable(false);
holder.defaultNumber = 0;
} else {
// decrem_btn.setClickable(true);
holder.defaultNumber--;
}
if (holder.defaultNumber == 0) {
holder.ivdown1.setClickable(false);
}
holder.stepper_display.setText(Integer.toString(holder.defaultNumber));
}
});
holder.stepper_display.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//filled array here
valueList[position] = s.toString();
}
@Override
public void afterTextChanged(Editable s) {
}
});
holder.tvproductname.setText(productName[position]);
holder.tvproducttype.setText(productType[position]);
holder.tvproductunit.setText("");
holder.tvproductprice.setText(productPrice[position]);
holder.tvproductorder.setText(lastFourOrder[position]);
holder.tvproductid.setText(productId[position]);
return convertView;
}
// created method here
public String[] getValueList(){
return valueList;
}
}
活動課
String[] string = lv.getValueList();
for (int i = 0; i < list.getAdapter().getCount(); i++) {
View v1 = getViewByPosition(i, list);
String editTextValue = string[i];
}
public View getViewByPosition(int position, ListView listView) {
final int firstListItemPosition = listView.getFirstVisiblePosition();
final int lastListItemPosition = firstListItemPosition + listView.getChildCount() - 1;
if (position < firstListItemPosition || position > lastListItemPosition ) {
return listView.getAdapter().getView(position, null, listView);
} else {
final int childIndex = position - firstListItemPosition;
return listView.getChildAt(childIndex);
}
}
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