Количество позиций в корзине: увеличение/уменьшение и добавление в корзину. ⇐ Android

[Anonymous]

Привет всем, я использую собственное представление списка для получения данных с сервера и отображения в представлении списка. Я могу получить данные и показать их в представлении списка, но я не знаю, как реализовать событие нажатия кнопки внутри элемента списка. Есть две кнопки для увеличения и уменьшения количества. Мой прослушиватель кликов работает, но работает неправильно. Когда я нажимаю «Увеличить» или «Уменьшить» товар, он должен быть добавлен в корзину. Пожалуйста, помогите мне исправить эту проблему. Я искал слишком много сообщений в , но не смог этого понять...

Вот код моего класса адаптера:

Код: Выделить всё

public class ProductsAdapter extends BaseAdapter {
private ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();

private Context context;
private ArrayList postItems;
public SharedPreferences settings;
public final String PREFS_NAME = "Products";

DisplayImageOptions options;
ImageLoaderConfiguration imgconfig;

private static int _counter = 0;
private String _stringVal;

public ProductsAdapter(Context context, ArrayList arraylist){
this.context = context;

File cacheDir = StorageUtils.getCacheDirectory(context);
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.loading)
.showImageForEmptyUri(R.drawable.loading)
.showImageOnFail(R.drawable.loading)
.cacheInMemory(true)
.cacheOnDisk(true)
.considerExifParams(true)
.displayer(new SimpleBitmapDisplayer())
.imageScaleType(ImageScaleType.EXACTLY)
.build();

imgconfig = new ImageLoaderConfiguration.Builder(context)
.build();
ImageLoader.getInstance().init(imgconfig);

postItems = arraylist;
settings = context.getSharedPreferences(PREFS_NAME, 0);

}

@Override
public int getCount() {
return postItems.size();
}
@Override
public Object getItem(int position) {
return postItems.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater)
context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.row_products, null);
}
final HashMap map = postItems.get(position);

ImageView imgProduct = (ImageView)convertView.findViewById(R.id.proimage);
ImageLoader.getInstance().displayImage(ConstValue.PRO_IMAGE_BIG_PATH+map.get("image"), imgProduct, options, animateFirstListener);

TextView txtTitle = (TextView)convertView.findViewById(R.id.proTitle);
txtTitle.setText(map.get("title"));

TextView txtPrice = (TextView)convertView.findViewById(R.id.txtprice);
txtPrice.setText(map.get("price"));

TextView textDiscount = (TextView)convertView.findViewById(R.id.textDiscount);
textDiscount.setVisibility(View.GONE);

TextView txtDiscountFlag = (TextView)convertView.findViewById(R.id.textDiscountFlag);
txtDiscountFlag.setVisibility(View.GONE);

TextView textCurrency = (TextView)convertView.findViewById(R.id.textCurrency);
textCurrency.setText(map.get("currency"));

final TextView value = (TextView)convertView.findViewById(R.id.textView3);

Button txtminus = (Button) convertView.findViewById(R.id.minus);

txtminus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

Log.d("src", "Decreasing value...");
_counter--;
_stringVal = Integer.toString(_counter);
value.setText(_stringVal);

if (_counter < 0)
{
value.setText("0");
}

}
});

Button txtplus  = (Button) convertView.findViewById(R.id.plus);
txtplus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("src", "Increasing value...");
_counter++;
_stringVal = Integer.toString(_counter);
value.setText(_stringVal);
}
});

if(!map.get("discount").equalsIgnoreCase("") && !map.get("discount").equalsIgnoreCase("0")){
Double discount = Double.parseDouble(map.get("discount"));
Double price = Double.parseDouble(map.get("price"));
Double discount_amount =  discount * price / 100;

Double effected_price = price - discount_amount ;
//txtPrice.setBackgroundResource(R.drawable.strike_trough);
txtPrice.setPaintFlags(txtPrice.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
textDiscount.setVisibility(View.VISIBLE);
textDiscount.setText(effected_price.toString());

txtDiscountFlag.setVisibility(View.VISIBLE);
txtDiscountFlag.setText(discount+"% off");
}

TextView txtUnit = (TextView)convertView.findViewById(R.id.txtunit);
txtUnit.setText(map.get("gmqty"));

TextView txtgm = (TextView)convertView.findViewById(R.id.txtgm);
txtgm.setText(map.get("unit"));

int a = Integer.parseInt(map.get("total_qty_stock").toString());
int b = Integer.parseInt(map.get("consume_qty_stock").toString());

int result = a - b;

TextView txtstock = (TextView)convertView.findViewById(R.id.stock);
txtstock.setText(String.valueOf(result)+" "+map.get("type")+" In Stock");
//txtstock.setText(map.get("stock")+" "+map.get("type")+" In Stock");

return convertView;
}

}

Вот мой код ProductActivity

публичный класс ProductsActivity расширяет ActionBarActivity {

Код: Выделить всё

public SharedPreferences settings;
public ConnectionDetector cd;
static ArrayList products_array;
ProductsAdapter adapter;
ListView products_listview;
DisplayImageOptions options;
ImageLoaderConfiguration imgconfig;
ProgressDialog dialog;

TextView txtcount;
Button btn;

private ImageLoadingListener animateFirstListener = new AnimateFirstDisplayListener();
HashMap  catMap;
@SuppressWarnings("unchecked")
@Override
protected void onCreate(Bundle savedInstanceState) {
settings = getSharedPreferences(ConstValue.MAIN_PREF, 0);
cd = new ConnectionDetector(getApplicationContext());

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_products);

/*  ActionBar mActionBar = getActionBar();
mActionBar.setDisplayShowHomeEnabled(true);
mActionBar.setDisplayShowTitleEnabled(true);
LayoutInflater mInflater = LayoutInflater.from(this);

View mCustomView = mInflater.inflate(R.layout.custom_actionbar, null);
TextView mTitleTextView = (TextView) mCustomView.findViewById(R.id.title_text);
mTitleTextView.setText("My Own Title");

mActionBar.setCustomView(mCustomView);
mActionBar.setDisplayShowCustomEnabled(true); */

settings = getSharedPreferences(ConstValue.MAIN_PREF, 0);
cd=new ConnectionDetector(this);

File cacheDir = StorageUtils.getCacheDirectory(this);
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.loading)
.showImageForEmptyUri(R.drawable.loading)
.showImageOnFail(R.drawable.loading)
.cacheInMemory(true)
.cacheOnDisk(true)
.considerExifParams(true)
.displayer(new SimpleBitmapDisplayer())
.imageScaleType(ImageScaleType.NONE)
.build();

imgconfig = new ImageLoaderConfiguration.Builder(this)
.build();
ImageLoader.getInstance().init(imgconfig);

ArrayList  categoryArray = new ArrayList();
try {
categoryArray = (ArrayList) ObjectSerializer.deserialize(settings.getString("categoryname", ObjectSerializer.serialize(new ArrayList())));
}catch (IOException e) {
e.printStackTrace();
}

catMap = new HashMap();
catMap = categoryArray.get(getIntent().getExtras().getInt("position"));

products_array = new ArrayList();
try {
products_array = (ArrayList) ObjectSerializer.deserialize(settings.getString("products_"+catMap.get("id"), ObjectSerializer.serialize(new ArrayList())));
}catch (IOException e) {
e.printStackTrace();
}

products_listview = (ListView)findViewById(R.id.listView1);
adapter = new ProductsAdapter(getApplicationContext(), products_array);
products_listview.setAdapter(adapter);

TextView txtTitle = (TextView)findViewById(R.id.catname);
txtTitle.setText(catMap.get("name"));

txtcount = (TextView)findViewById(R.id.textcount);

btn = (Button) findViewById(R.id.button);

products_listview.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView arg0, View arg1, final int position,
long id) {
// TODO Auto-generated method stub

try {

settings.edit().putString("selected_product", ObjectSerializer.serialize(products_array.get(position))).commit();

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

Intent intent = new Intent(ProductsActivity.this, ProductdetailActivity.class);
intent.putExtra("position", position);
startActivity(intent);

}
});

new loadProductsTask().execute(true);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

public class loadProductsTask extends AsyncTask {

JSONParser jParser;
JSONObject json;
String count;
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}

@Override
protected void onPostExecute(ArrayList result) {
// TODO Auto-generated method stub
if (result!=null) {
//adapter.notifyDataSetChanged();
}
try {
settings.edit().putString("products_"+catMap.get("id"), ObjectSerializer.serialize(products_array)).commit();

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

txtcount.setText(count);
adapter.notifyDataSetChanged();
super.onPostExecute(result);
}

@Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}

@Override
protected void onCancelled(ArrayList result) {
// TODO Auto-generated method stub
super.onCancelled(result);
}

@Override
protected ArrayList doInBackground(
Boolean...  params) {
// TODO Auto-generated method stub

try {
jParser = new JSONParser();

if(cd.isConnectingToInternet())
{
String urlstring = ConstValue.JSON_PRODUCTS+"&id="+catMap.get("id");
json = jParser.getJSONFromUrl(urlstring);
count = json.getString("count");
if (json.has("data")) {
if(json.get("data") instanceof JSONArray){
JSONArray jsonDrList = json.getJSONArray("data");
products_array.clear();
for (int i = 0; i < jsonDrList.length(); i++) {
JSONObject obj = jsonDrList.getJSONObject(i);
put_object(obj);
}
}else if(json.get("data") instanceof JSONObject){
put_object(json.getJSONObject("data"));
}
}
}else
{
Toast.makeText(ProductsActivity.this, "Please connect mobile with working Internet", Toast.LENGTH_LONG).show();
}

jParser = null;
json = null;

} catch (Exception e) {
// TODO: handle exception

return null;
}
return null;
}

public void put_object(JSONObject obj){
HashMap map = new HashMap();

try {
map.put("id", obj.getString("id"));
map.put("title", obj.getString("title"));
map.put("slug", obj.getString("slug"));
map.put("description", obj.getString("description"));
map.put("image", obj.getString("image"));

map.put("price", obj.getString("price"));
map.put("currency", obj.getString("currency"));
map.put("discount", obj.getString("discount"));
map.put("cod", obj.getString("cod"));
map.put("emi", obj.getString("emi"));
map.put("status", obj.getString("status"));

map.put("gmqty", obj.getString("gmqty"));
map.put("unit", obj.getString("unit"));
map.put("deliverycharge", obj.getString("deliverycharge"));
map.put("tax", obj.getString("tax"));
map.put("category_id", obj.getString("category_id"));

map.put("on_date", obj.getString("on_date"));

map.put("stock", obj.getString("stock"));
map.put("type", obj.getString("type"));
map.put("total_qty_stock", obj.getString("total_qty_stock"));
map.put("consume_qty_stock", obj.getString("consume_qty_stock"));

products_array.add(map);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

Подробнее здесь: https://stackoverflow.com/questions/387 ... dd-to-cart