首次选择价格，数量值。我添加所有价格并在totalamount中显示为textview.up，现在工作正常。如果我更改了数值，我可以自动更改价格值，我想要更改textview
中的总价值我试试这段代码
public class SelectedItem extends Activity {
private ListView lv;
private CustomAdapter adapter;
int tableid;
String id;
ArrayList<String> arr=new ArrayList<String>();
ArrayList<String> price=new ArrayList<String>();
ArrayList<Bitmap> image=new ArrayList<Bitmap>();
Double amountvalue;
TextView totalamount;
Button order;
String dtotalamount;
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
arr=getIntent().getStringArrayListExtra("itemname");
price=getIntent().getStringArrayListExtra("itemprice");
image=getIntent().getExtras().getParcelableArrayList("itemimage");
setContentView(R.layout.selecteditem);
lv = (ListView) findViewById(R.id.selecteditemlist);
adapter = new CustomAdapter(this, arr,price,image);
lv.setAdapter(adapter);
amountvalue=CustomAdapter.x;
System.out.println(amountvalue);
totalamount=(TextView)findViewById(R.id.amount);
totalamount.setText(String.valueOf(amountvalue));(here only i can display the total value...now i want change qty means total also will change)
order=(Button)findViewById(R.id.order);
order.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
try
{
tableid=Login.tableid;
id=Integer.toString(tableid);
System.out.println(id);
String x=amountvalue.toString();
public class SelectedItem extends Activity {
private ListView lv;
private CustomAdapter adapter;
int tableid;
String id;
ArrayList<String> arr=new ArrayList<String>();
ArrayList<String> price=new ArrayList<String>();
ArrayList<Bitmap> image=new ArrayList<Bitmap>();
Double amountvalue;
TextView totalamount;
Button order;
String dtotalamount;
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
arr=getIntent().getStringArrayListExtra("itemname");
price=getIntent().getStringArrayListExtra("itemprice");
image=getIntent().getExtras().getParcelableArrayList("itemimage");
setContentView(R.layout.selecteditem);
lv = (ListView) findViewById(R.id.selecteditemlist);
adapter = new CustomAdapter(this, arr,price,image);
lv.setAdapter(adapter);
amountvalue=CustomAdapter.x;
System.out.println(amountvalue);
totalamount=(TextView)findViewById(R.id.amount);
totalamount.setText(String.valueOf(amountvalue));
order=(Button)findViewById(R.id.order);
order.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
tableid=Login.tableid;
id=Integer.toString(tableid);
System.out.println(id);
String x=amountvalue.toString();
}
});
}
}
CustomAdapter.java
public class CustomAdapter extends BaseAdapter {
public static Double x = 0.0;
public static Double z;
ArrayList<Integer> selectprice = new ArrayList<Integer>();
public static ArrayList<String> arr1 = new ArrayList<String>();
public static ArrayList<String> itemprice = new ArrayList<String>();
public static ArrayList<Bitmap> itemimage = new ArrayList<Bitmap>();
ArrayList<Integer> total = new ArrayList<Integer>();
public Context Context;
private LayoutInflater inflater;
HashMap<String, String> map = new HashMap<String, String>();
public CustomAdapter(Context context, ArrayList<String> arr,
ArrayList<String> price, ArrayList<Bitmap> image) {
Context = context;
inflater = LayoutInflater.from(context);
arr1 = arr;
itemprice = price;
itemimage = image;
System.out.println(itemprice);
System.out.println("arr: " + arr.size());
for (int i = 0; i < price.size(); i++) {
x = x + Double.parseDouble(price.get(i));
}
}
public int getCount() {
// TODO Auto-generated method stub
return arr1.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return arr1.get(position);
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public void clear() {
arr1.clear();
}
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.selecteditemlistview, null);
holder = new ViewHolder();
holder.textViewSelectedText = (TextView) convertView
.findViewById(R.id.selectedtext);
holder.price = (TextView) convertView
.findViewById(R.id.selectitemprice);
holder.image = (ImageView) convertView
.findViewById(R.id.selectitemimage);
holder.qty = (EditText) convertView.findViewById(R.id.selectqty);
holder.total = (TextView) convertView.findViewById(R.id.price);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
@SuppressWarnings("unused")
String amount = holder.qty.getText().toString();
final Double price1 = Double.parseDouble(itemprice.get(position));
int qut = Integer.parseInt(holder.qty.getText().toString());
final double total = (price1 * qut);
holder.textViewSelectedText.setText(arr1.get(position));
holder.price.setText(itemprice.get(position));
holder.image.setImageBitmap(itemimage.get(position));
holder.total.setText(String.valueOf(total));
holder.qty.setOnFocusChangeListener(new OnFocusChangeListener() {
@SuppressWarnings("static-access")
public void onFocusChange(View v, boolean hasFocus) {
// TODO Auto-generated method stub
if (!hasFocus) {
int position = v.getId();
final EditText Caption = (EditText) v;
Caption.setFocusable(true);
holder.qty.setFocusable(true);
int q = Integer.parseInt(holder.qty.getText().toString());
Double result = (price1 * q);
Double y = x - total;
double z = y + result;
}
}
});
return convertView;
}
class ViewHolder {
TextView textViewSelectedText = null;
TextView price = null;
ImageView image = null;
EditText qty = null;
TextView total = null;
}
}
第一次x（customadapter）值可以总计显示。更改数量后，我将得到z（customadapter）值。这个z值我想传递总数..请任何人都可以帮助我
答案 0 :(得分：0)
还好。在适配器的getView（）内部执行此操作，
您必须为EditText使用 TextWatcher 。很简单。
holder.qty.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
int q = Integer.parseInt(holder.qty.getText().toString());
Double result = (price1 * q);
Double y = x - total;
double z = y + result;
totalamount.setText(String.valueOf(z));
}
});
编辑1
在您的SelectedItem.Java中，
更改此行
adapter = new CustomAdapter(this, arr,price,image);
as，
adapter = new CustomAdapter(this, arr,price,image,totalamount);
现在在 CustomAdapter类中全局添加TextView，
TextView totalamount=null;
现在改变构造函数，
public CustomAdapter(Context context, ArrayList<String> arr,
ArrayList<String> price, ArrayList<Bitmap> image,TextView text) {
Context = context;
inflater = LayoutInflater.from(context);
arr1 = arr;
itemprice = price;
totalamount=text;
itemimage = image;
System.out.println(itemprice);
System.out.println("arr: " + arr.size());
for (int i = 0; i < price.size(); i++) {
x = x + Double.parseDouble(price.get(i));
}
}