我有这个“ activity_cart.xml”：
<ListView
android:id="@+id/listOrder"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:fadeScrollbars="true"
android:fastScrollEnabled="true"
android:divider="@null"
android:layout_below="@+id/txtDetail"/>
带有“ ActivityCart.java”
public class ActivityCart extends AppCompatActivity {
// declare view objects
ListView listOrder;
ProgressBar prgLoading;
TextView txtTotalLabel, txtTotal, txtAlert;
RelativeLayout lytOrder;
ImageView removeProd;
// declate dbhelper and adapter objects
DBHelper dbhelper;
AdapterCart mola;
// declare static variables to store tax and currency data
public static double Tax;
public static String Currency;
// declare arraylist variable to store data
ArrayList<ArrayList<Object>> data;
public static ArrayList<Integer> Menu_ID = new ArrayList<Integer>();
public static ArrayList<String> Menu_name = new ArrayList<String>();
public static ArrayList<Integer> Quantity = new ArrayList<Integer>();
public static ArrayList<Double> Sub_total_price = new ArrayList<Double>();
double Total_price;
final int CLEAR_ALL_ORDER = 0;
final int CLEAR_ONE_ORDER = 1;
int FLAG;
int ID;
String TaxCurrencyAPI;
int IOConnect = 0;
// create price format
DecimalFormat formatData = new DecimalFormat("#.##");
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
final android.support.v7.app.ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle(R.string.title_cart);
}
FloatingActionButton clear = (FloatingActionButton) findViewById(R.id.fabClear);
clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showClearDialog(CLEAR_ALL_ORDER, 1111);
}
});
FloatingActionButton checkout = (FloatingActionButton) findViewById(R.id.fabCheckout);
checkout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dbhelper.close();
Intent i = new Intent(ActivityCart.this, ActivityCheckout.class);
startActivity(i);
}
});
// connect view objects with xml id
prgLoading = (ProgressBar) findViewById(R.id.prgLoading);
listOrder = (ListView) findViewById(R.id.listOrder);
txtTotalLabel = (TextView) findViewById(R.id.txtTotalLabel);
txtTotal = (TextView) findViewById(R.id.txtTotal);
txtAlert = (TextView) findViewById(R.id.txtAlert);
removeProd = (ImageView) findViewById(R.id.removeProd);
lytOrder = (RelativeLayout) findViewById(R.id.lytOrder);
// tax and currency API url
TaxCurrencyAPI = Config.ADMIN_PANEL_URL + "/api/get-tax-and-currency.php" + "?accesskey=" + Config.AccessKey;
mola = new AdapterCart(this);
dbhelper = new DBHelper(this);
// open database
try {
dbhelper.openDataBase();
} catch (SQLException sqle) {
throw sqle;
}
// call asynctask class to request tax and currency data from server
new getTaxCurrency().execute();
// event listener to handle list when clicked
listOrder.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
// show confirmation dialog
showClearDialog(CLEAR_ONE_ORDER, Menu_ID.get(position));
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_cart, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
switch (item.getItemId()) {
case android.R.id.home:
// app icon in action bar clicked; go home
this.finish();
return true;
case R.id.checkout:
dbhelper.close();
Intent i = new Intent(ActivityCart.this, ActivityCheckout.class);
startActivity(i);
return true;
case R.id.clear:
showClearDialog(CLEAR_ALL_ORDER, 1111);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
// method to create dialog
void showClearDialog(int flag, int id) {
FLAG = flag;
ID = id;
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.confirm);
switch (FLAG) {
case 0:
builder.setMessage(getString(R.string.clear_all_order));
break;
case 1:
builder.setMessage(getString(R.string.clear_one_order));
break;
}
builder.setCancelable(false);
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
switch (FLAG) {
case 0:
// clear all menu in order table
dbhelper.deleteAllData();
listOrder.invalidateViews();
clearData();
new getDataTask().execute();
break;
case 1:
// clear selected menu in order table
dbhelper.deleteData(ID);
listOrder.invalidateViews();
clearData();
new getDataTask().execute();
break;
}
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
// close dialog
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
// asynctask class to handle parsing json in background
public class getTaxCurrency extends AsyncTask<Void, Void, Void> {
// show progressbar first
getTaxCurrency() {
if (!prgLoading.isShown()) {
prgLoading.setVisibility(View.VISIBLE);
txtAlert.setVisibility(View.GONE);
}
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
// parse json data from server in background
parseJSONDataTax();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
// when finish parsing, hide progressbar
prgLoading.setVisibility(View.GONE);
// if internet connection available request data form server
// otherwise, show alert text
if (IOConnect == 0) {
new getDataTask().execute();
} else {
txtAlert.setVisibility(View.VISIBLE);
txtAlert.setText(R.string.alert);
}
}
}
// method to parse json data from server
public void parseJSONDataTax() {
try {
// request data from tax and currency API
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 15000);
HttpConnectionParams.setSoTimeout(client.getParams(), 15000);
HttpUriRequest request = new HttpGet(TaxCurrencyAPI);
HttpResponse response = client.execute(request);
InputStream atomInputStream = response.getEntity().getContent();
BufferedReader in = new BufferedReader(new InputStreamReader(atomInputStream));
String line;
String str = "";
while ((line = in.readLine()) != null) {
str += line;
}
// parse json data and store into tax and currency variables
JSONObject json = new JSONObject(str);
JSONArray data = json.getJSONArray("data"); // this is the "items: [ ] part
JSONObject object_tax = data.getJSONObject(0);
JSONObject tax = object_tax.getJSONObject("tax_n_currency");
Tax = Double.parseDouble(tax.getString("Value"));
JSONObject object_currency = data.getJSONObject(1);
JSONObject currency = object_currency.getJSONObject("tax_n_currency");
Currency = currency.getString("Value");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
IOConnect = 1;
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// clear arraylist variables before used
void clearData() {
Menu_ID.clear();
Menu_name.clear();
Quantity.clear();
Sub_total_price.clear();
}
// asynctask class to handle parsing json in background
public class getDataTask extends AsyncTask<Void, Void, Void> {
// show progressbar first
getDataTask() {
if (!prgLoading.isShown()) {
prgLoading.setVisibility(View.VISIBLE);
lytOrder.setVisibility(View.GONE);
txtAlert.setVisibility(View.GONE);
}
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
// get data from database
getDataFromDatabase();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
// show data
txtTotal.setText(Total_price + " " + Currency);
txtTotalLabel.setText(getString(R.string.total_order) + " (Tax " + Tax + "%)");
prgLoading.setVisibility(View.GONE);
// if data available show data on list
// otherwise, show alert text
if (Menu_ID.size() > 0) {
lytOrder.setVisibility(View.VISIBLE);
listOrder.setAdapter(mola);
} else {
txtAlert.setVisibility(View.VISIBLE);
}
}
}
// method to get data from server
public void getDataFromDatabase() {
Total_price = 0;
clearData();
data = dbhelper.getAllData();
// store data to arraylist variables
for (int i = 0; i < data.size(); i++) {
ArrayList<Object> row = data.get(i);
Menu_ID.add(Integer.parseInt(row.get(0).toString()));
Menu_name.add(row.get(1).toString());
Quantity.add(Integer.parseInt(row.get(2).toString()));
Sub_total_price.add(Double.parseDouble(formatData.format(Double.parseDouble(row.get(3).toString()))));
Total_price += Sub_total_price.get(i);
}
// count total order
Total_price -= (Total_price * (Tax / 100));
Total_price = Double.parseDouble(formatData.format(Total_price));
}
// when back button pressed close database and back to previous page
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
dbhelper.close();
finish();
}
@Override
public void onConfigurationChanged(final Configuration newConfig) {
// Ignore orientation change to keep activity from restarting
super.onConfigurationChanged(newConfig);
}
}
和此“ AdapterCart.java”
public class AdapterCart extends BaseAdapter {
private LayoutInflater inflater;
public AdapterCart(Context context) {
inflater = LayoutInflater.from(context);
}
public int getCount() {
// TODO Auto-generated method stub
return ActivityCart.Menu_ID.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if(convertView == null){
convertView = inflater.inflate(R.layout.lsv_item_order_list, null);
holder = new ViewHolder();
holder.txtMenuName = (TextView) convertView.findViewById(R.id.txtMenuName);
holder.txtQuantity = (TextView) convertView.findViewById(R.id.txtQuantity);
holder.txtPrice = (TextView) convertView.findViewById(R.id.txtPrice);
holder.removeProd = (ImageView) convertView.findViewById(R.id.removeProd);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.txtMenuName.setText(ActivityCart.Menu_name.get(position));
holder.txtQuantity.setText(String.valueOf(ActivityCart.Quantity.get(position)));
holder.txtPrice.setText(ActivityCart.Sub_total_price.get(position)+" "+ActivityCart.Currency);
return convertView;
}
static class ViewHolder {
TextView txtMenuName, txtQuantity, txtPrice;
ImageView removeProd;
}
}
最后是“布局lsv_item_order_list.xml”：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background_color">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:foreground="?android:attr/selectableItemBackground"
app:cardCornerRadius="4dp"
card_view:cardElevation="3sp"
card_view:cardUseCompatPadding="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:orientation="vertical" >
<TextView
android:id="@+id/txtMenuName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:width="120dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginRight="9dp"
android:textColor="@color/black"
android:textSize="16sp"/>
<TextView
android:id="@+id/txtFlacon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:width="150dp"
android:layout_toRightOf="@+id/txtMenuName"
android:layout_centerVertical="true"
android:textColor="@color/black"
android:text="100 Tab."
android:textSize="16sp" />
<ImageView
android:id="@+id/qtyMinus"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentTop="true"
android:layout_centerVertical="true"
android:layout_toLeftOf="@+id/txtQuantity"
android:src="@drawable/ic_minus" />
<TextView
android:id="@+id/txtQuantity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:width="30dp"
android:height="25dp"
android:background="@drawable/spinner_background"
android:layout_toRightOf="@+id/txtFlacon"
android:layout_centerVertical="true"
android:textColor="@color/black"
android:gravity="center"
android:textSize="16sp" />
<ImageView
android:id="@+id/qtyPlus"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentTop="true"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/txtQuantity"
android:src="@drawable/ic_plus" />
<TextView
android:id="@+id/txtPrice"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_below="@+id/txtMenuName"
android:gravity="left"
android:paddingTop="5dp"
android:textColor="@color/black"
android:textStyle="bold"
android:textSize="16sp" />
</RelativeLayout>
<ImageView
android:id="@+id/removeProd"
android:layout_width="25dp"
android:layout_height="35dp"
android:layout_centerVertical="true"
android:layout_marginRight="5dp"
android:layout_gravity="right"
android:src="@drawable/ic_remove" />
</android.support.v7.widget.CardView>
当前，当我按listOrder时，我的购物车商品将删除。 我的问题是当我在布局lsv_item_order_list.xml中按下ID为“ removeProd”的ImageView时，如何删除购物车项目。
我希望有人可以帮助我。