Java 对一行进行更改,但效果将显示在下一行中
嗨,朋友们,我不知道如何在列表视图的同一行中设置文本,我有两个按钮,文本视图位于中间,但当我尝试递增或递减时,效果显示在下一行,而不是我希望应用更改的行上 CartAdapter.javaJava 对一行进行更改,但效果将显示在下一行中,java,android,listview,Java,Android,Listview,嗨,朋友们,我不知道如何在列表视图的同一行中设置文本,我有两个按钮,文本视图位于中间,但当我尝试递增或递减时,效果显示在下一行,而不是我希望应用更改的行上 CartAdapter.java public class Cart_Adapter extends BaseAdapter { Context cartcontext; List<MobiData> cartlist; LayoutInflater inflater; cartlist cart
public class Cart_Adapter extends BaseAdapter {
Context cartcontext;
List<MobiData> cartlist;
LayoutInflater inflater;
cartlist cartdata;
public ArrayList<Integer> quantity = new ArrayList<Integer>();
CustomButtonListener customButtonListener;
public Cart_Adapter(Context cartcontext, List<MobiData> cartlist) {
this.cartcontext = cartcontext;
this.cartlist = cartlist;
}
@Override
public int getCount() {
return cartlist.size();
}
@Override
public Object getItem(int position) {
return cartlist.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
inflater = (LayoutInflater) cartcontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
cartdata = new cartlist();
convertView = inflater.inflate(R.layout.cart_row, parent, false);
cartdata.decrement = (TextView) convertView.findViewById(R.id.decrement);
cartdata.single = (TextView) convertView.findViewById(R.id.single);
cartdata.single.setTag(position);
cartdata.increment = (TextView) convertView.findViewById(R.id.increment);
cartdata.increment.setTag(position);
cartdata.cancel = (TextView) convertView.findViewById(R.id.cancel);
cartdata.vcmedname = (TextView) convertView.findViewById(R.id.vcmedname);
cartdata.vcmedprice = (TextView) convertView.findViewById(R.id.vcmedprice);
Typeface carttext = Typeface.createFromAsset(cartcontext.getAssets(), "fonts/fontawesome.ttf");
cartdata.decrement.setTypeface(carttext);
cartdata.increment.setTypeface(carttext);
cartdata.cancel.setTypeface(carttext);
convertView.setTag(cartdata);
} else {
cartdata = (cartlist) convertView.getTag();
}
MobiData newcart = cartlist.get(position);
cartdata.vcmedname.setText(newcart.getVcmedname());
cartdata.vcmedprice.setText(newcart.getVcmedprice());
cartdata.single.setText(newcart.getVcqty());
final String cartids = newcart.getVcmedid();
cartdata.cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
cartlist.remove(position);
notifyDataSetChanged();
}
});
cartdata.increment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick( View v) {
if (customButtonListener !=null){
int plus = Integer.parseInt(cartdata.single.getText().toString());
plus++;
int plus = Integer.parseInt(cartdata.single.getText().toString());
plus++;
cartdata.single.setText(String.valueOf(plus));
SharedPreferences viewpref = cartcontext.getSharedPreferences("datapref", Context.MODE_PRIVATE);
String cartuid = viewpref.getString("uid", "");
String carttempid = viewpref.getString("tempid", "");
String incremnturl = "http://sampletemplates.net/mobichemist/json/cart_process.php?mid=" + cartids + "&userid=" + cartuid + "&tempid=" + carttempid;
Log.d("Incremnturl", incremnturl);
JsonArrayRequest incrementarray = new JsonArrayRequest(Request.Method.GET, incremnturl, (String) null, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
for (int i = 0; i < response.length(); i++) {
try {
JSONObject incrobj = response.getJSONObject(i);
int plus = Integer.parseInt(cartdata.single.getText().toString());
plus++;
cartdata.single.setText(String.valueOf(plus));
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.d("Incrementurl", String.valueOf(error));
}
});
incrementarray.setRetryPolicy(new DefaultRetryPolicy(50000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(incrementarray);
}
});
cartdata.decrement.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int i = Integer.parseInt(cartdata.single.getText().toString());
i--;
if (i <= 0) {
Toast.makeText(Single_Cart_Page.this, "Minimum Quantity is 1", Toast.LENGTH_SHORT).show();
} else {
cartdata.single.setText(String.valueOf(i));
}
}
});
return convertView;
}
static class cartlist {
TextView decrement, single, increment, cancel, vcmedname, vcmedprice;
}
公共类Cart\u适配器扩展了BaseAdapter{
语境与语境;
清单清单;
充气机;
cartlistcartdata;
公共ArrayList数量=新建ArrayList();
CustomButtonListener CustomButtonListener;
公共购物车适配器(上下文购物车上下文,列表购物车列表){
this.cartcontext=cartcontext;
this.cartlist=cartlist;
}
@凌驾
public int getCount(){
返回cartlist.size();
}
@凌驾
公共对象getItem(int位置){
返回cartlist.get(位置);
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
充气器=(LayoutFlater)cartcontext.getSystemService(Context.LAYOUT\u充气器\u服务);
if(convertView==null){
cartdata=新的cartlist();
convertView=充气机。充气(R.layout.cart_行,父项,false);
cartdata.decrement=(TextView)convertView.findViewById(R.id.decrement);
cartdata.single=(TextView)convertView.findViewById(R.id.single);
cartdata.single.setTag(位置);
cartdata.increment=(TextView)convertView.findViewById(R.id.increment);
cartdata.increment.setTag(位置);
cartdata.cancel=(TextView)convertView.findViewById(R.id.cancel);
cartdata.vcmedname=(TextView)convertView.findViewById(R.id.vcmedname);
cartdata.vcmedprice=(TextView)convertView.findViewById(R.id.vcmedprice);
Typeface carttext=Typeface.createFromAsset(cartcontext.getAssets(),“fonts/fontawesome.ttf”);
cartdata.减量.设置字体(carttext);
cartdata.increment.setTypeface(carttext);
cartdata.cancel.setTypeface(carttext);
setTag(cartdata);
}否则{
cartdata=(cartlist)convertView.getTag();
}
MobiData newcart=cartlist.get(位置);
cartdata.vcmedname.setText(newcart.getVcmedname());
cartdata.vcmedprice.setText(newcart.getVcmedprice());
cartdata.single.setText(newcart.getVcqty());
最后一个字符串cartids=newcart.getVcmedid();
cartdata.cancel.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
cartlist.移除(位置);
notifyDataSetChanged();
}
});
cartdata.increment.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
如果(customButtonListener!=null){
int plus=Integer.parseInt(cartdata.single.getText().toString());
plus++;
int plus=Integer.parseInt(cartdata.single.getText().toString());
plus++;
cartdata.single.setText(String.valueOf(plus));
SharedReferences viewpref=cartcontext.GetSharedReferences(“datapref”,Context.MODE\u PRIVATE);
String cartuid=viewpref.getString(“uid”,“uid”);
String cartempid=viewpref.getString(“tempid”,”);
字符串增量字符串=”http://sampletemplates.net/mobichemist/json/cart_process.php?mid=“+cartids+”&userid=“+cartuid+”&tempid=“+carttempid;
Log.d(“增量”,增量);
JsonArrayRequest incrementarray=新的JsonArrayRequest(Request.Method.GET,incremnturl,(String)null,new Response.Listener(){
@凌驾
公共void onResponse(JSONArray响应){
对于(int i=0;i 如果(i使用ArrayAdaper,而不是带有ViewHolder的基本适配器。不要为所有视图手动设置setTag(位置)。
在此处查找ViewHolder示例。它将解决您的索引问题。ViewHolder类将设置所有视图的位置。还可以查找有关的详细说明尝试此操作并添加其他代码
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.cart_row, parent, false);
holder = new ViewHolder();
holder.decrement = (TextView) convertView.findViewById(R.id.decrement);
holder.single = (TextView) convertView.findViewById(R.id.single);
holder.increment = (TextView) convertView.findViewById(R.id.increment);
holder.cancel = (TextView) convertView.findViewById(R.id.cancel);
holder.vcmedname = (TextView) convertView.findViewById(R.id.vcmedname);
holder.vcmedprice = (TextView) convertView.findViewById(R.id.vcmedprice);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
Typeface carttext = Typeface.createFromAsset(cartcontext.getAssets(), "fonts/fontawesome.ttf");
holder.decrement.setTypeface(carttext);
holder.increment.setTypeface(carttext);
holder.cancel.setTypeface(carttext);
MobiData newcart = cartlist.get(position);
holder.vcmedname.setText(newcart.getVcmedname());
holder.vcmedprice.setText(newcart.getVcmedprice());
holder.single.setText(newcart.getVcqty());
final String cartids = newcart.getVcmedid();
holder.cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
cartlist.remove(position);
notifyDataSetChanged();
}
});
return convertView;
}
static class ViewHolder {
private TextView decrement;
private TextView single;
private TextView increment;
private TextView vcmedname;
private TextView vcmedprice;
}
ViewHolder类是否有任何错误或出现了相同的问题?因为我曾经使用过这种方法,并且它始终适用于我。没有错误,但第2Attempt行中的值是increment以调用虚拟方法“java.lang.Objec”