我正在创建一个具有添加到购物车功能的应用。我遵循这个tutorial并且它工作正常，但是当我尝试在listview中添加产品的配置文件中的添加到购物车时，我得到一个错误， IndexOutOfBoundsException索引51无效，大小为0
ProductDetails.java
public class ProductDetails extends Fragment {
static ConnectivityManager cm;
AlertDialog dialog2;
AlertDialog.Builder build;
TextView txtproduct,
txtprice,
txtcategorytype,
txtpieces,
txtdescription;
ImageView imgimage;
Button btncart,
btnview;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.product_details, container, false);
final Controller ct = (Controller) getActivity().getApplicationContext();
cm = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);// checking
build = new AlertDialog.Builder(getActivity()); // connectivity
// Create default options which will be used for every
// displayImage(...) call if no options will be passed to this method
DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder()
.cacheInMemory(true)
.cacheOnDisk(true)
.build();
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getActivity())
.defaultDisplayImageOptions(defaultOptions)
.build();
if (cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI)// if connection is
// there screen goes
// to next screen
// else shows
// message
.isConnectedOrConnecting()
|| cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
.isConnectedOrConnecting()) {
Log.e("cm value",
""
+ cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
.isConnectedOrConnecting());
int teaProfileId = getArguments().getInt("teaProfileId");
String teaProfileName = getArguments().getString("teaProfileName");
Float teaProfilePrice = getArguments().getFloat("teaProfilePrice");
String teaProfileImage = getArguments().getString("teaProfileImage");
String teaProfileLabel = getArguments().getString("teaProfileLabel");
int teaProfilePieces = getArguments().getInt("teaProfilePieces");
String teaProfilePiecesType = getArguments().getString("teaProfilePiecesType");
String teaProfileDescription = getArguments().getString("teaProfileDescription");
try {
JSONObject jsonObject1 = new JSONObject(String.valueOf(teaProfileId));
JSONObject jsonObject2 = new JSONObject(teaProfileName);
JSONObject jsonObject3 = new JSONObject(Float.toString(teaProfilePrice));
JSONObject jsonObject4 = new JSONObject(teaProfileImage);
JSONObject jsonObject5 = new JSONObject(teaProfileLabel);
JSONObject jsonObject6 = new JSONObject(String.valueOf(teaProfilePieces));
JSONObject jsonObject7 = new JSONObject(teaProfilePiecesType);
JSONObject jsonObject8 = new JSONObject(teaProfileDescription);
} catch (JSONException e) {
e.printStackTrace();
}
txtproduct = (TextView) rootView.findViewById(R.id.txtproduct);
txtprice = (TextView) rootView.findViewById(R.id.txtprice);
txtcategorytype = (TextView) rootView.findViewById(R.id.txtcategorytype);
txtpieces = (TextView) rootView.findViewById(R.id.txtpieces);
txtdescription = (TextView) rootView.findViewById(R.id.txtdescription);
txtproduct.setText(teaProfileName);
txtprice.setText(("PHP ") + String.format("%.2f", teaProfilePrice));
txtcategorytype.setText(teaProfileLabel);
txtpieces.setText((teaProfilePieces)+" "+(teaProfilePiecesType));
txtdescription.setText(teaProfileDescription.replaceAll("<br />",""));
imgimage = (ImageView)rootView.findViewById(R.id.imgimage);
final ProgressBar progressBar = (ProgressBar)rootView.findViewById(R.id.progressBar);
ImageLoader.getInstance().displayImage(teaProfileImage, imgimage, new ImageLoadingListener() {
@Override
public void onLoadingStarted(String imageUri, View view) {
progressBar.setVisibility(View.VISIBLE);
}
@Override
public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
progressBar.setVisibility(View.GONE);
}
@Override
public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
progressBar.setVisibility(View.GONE);
}
@Override
public void onLoadingCancelled(String imageUri, View view) {
progressBar.setVisibility(View.GONE);
}
});
}
else {
build.setMessage("This application requires Internet connection. Would you connect to internet ?");
build.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
}
});
build.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
getActivity().finish();
}
});
dialog2 = build.create();
dialog2.show();
}
btncart = (Button) rootView.findViewById(R.id.btncart);
btncart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int teaProfileId = getArguments().getInt("teaProfileId");
String teaProfileName = getArguments().getString("teaProfileName");
Float teaProfilePrice = getArguments().getFloat("teaProfilePrice");
String teaProfileImage = getArguments().getString("teaProfileImage");
String teaProfileLabel = getArguments().getString("teaProfileLabel");
int teaProfilePieces = getArguments().getInt("teaProfilePieces");
String teaProfilePiecesType = getArguments().getString("teaProfilePiecesType");
String teaProfileDescription = getArguments().getString("teaProfileDescription");
Toast.makeText(getActivity(), teaProfileName+" was added to cart.", Toast.LENGTH_LONG).show();
ProductModel productsObject = ct.getProducts(teaProfileId);
ct.getCart().setProducts(productsObject);
}
});
btnview = (Button) rootView.findViewById(R.id.btnview);
btnview.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent in = new Intent(getActivity(),Screen1.class);
startActivity(in);
}
});
return rootView;
}
}
Controller.java
public class Controller extends Application {
private ArrayList<ProductModel> myproducts = new ArrayList<ProductModel>();
private ModelCart myCart = new ModelCart();
public ProductModel getProducts(int id){
return myproducts.get(id);
}
public void setProducts(ProductModel products){
myproducts.add(products);
}
public ModelCart getCart(){
return myCart;
}
}
ModelCart.java
public class ModelCart {
private ArrayList<ProductModel> cartItems = new ArrayList<ProductModel>();
public ProductModel getProducts(int position){
return cartItems.get(position);
}
public void setProducts(ProductModel Products){
cartItems.add(Products);
}
public int getCartsize(){
return cartItems.size();
}
public boolean CheckProductInCart(ProductModel aproduct){
return cartItems.contains(aproduct);
}
}
这是logcat中的错误。
java.lang.IndexOutOfBoundsException: Invalid index 51, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
.Controller.getProducts(Controller.java:19)
.ProductDetails$4.onClick(ProductDetails.java:192)
这是第19行：return myproducts.get（id）; 这是第192行：ProductModel productsObject = ct.getProducts（teaProfileId）;