如何从Android Studio中获取arraylist [英] How to get the arraylist out android studio
本文介绍了如何从Android Studio中获取arraylist的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
当ArrayList
在其他页面上时,我无法将其退出.我想将ArrayList
退出Android Studio.
I am unable to get my ArrayList
out when it's on a different page. I would like to get the ArrayList
out Android Studio.
这是CartActivity
类:
public class CartActivity extends AppCompatActivity {
private ArrayList<CartItem> cartList;
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
listView = (ListView) findViewById(R.id.listView);
CartAdapter adapter = null;
cartList = new ArrayList<>();
adapter = new CartAdapter(this, R.layout.adapter_cart_item, cartList);
listView.setAdapter(adapter);
}
}
这是ProductActivity
类.这是将数据存储到ArrayList
:
This is ProductActivity
class. It's where the data is being stored into the ArrayList
:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product);
myDB = new DatabaseHelper(ProductActivity.this);
textViewPrice = (TextView) findViewById(R.id.textViewPrice);
textViewInfo = (TextView) findViewById(R.id.textViewInfo);
textViewName = (TextView) findViewById(R.id.textViewName);
ivProduct = (ImageView) findViewById(R.id.ivProduct);
btnAddToCart = (Button) findViewById(R.id.btnAddToCart);
spinnerQuantity = (Spinner) findViewById(R.id.spinnerQuantity);
Intent in = getIntent();
Bundle b = in.getExtras();
userID = b.getString("userID");
productID = b.getInt("productID");
Cursor results = myDB.checkProduct();
if (results.getCount() == 0) {
Toast.makeText(getApplicationContext(), "Error: no data found!",
Toast.LENGTH_SHORT).show();
return;
} else {
StringBuffer buffer = new StringBuffer();
while (results.moveToNext()) {
id = results.getInt(0);
name = results.getString(1);
price = results.getString(2);
info = results.getString(4);
quantity = Integer.parseInt(results.getString(5));
image = results.getBlob(6);
if (id == productID) {
textViewName.setText(name);
textViewInfo.setText(info);
textViewPrice.setText("S$" + price);
int[] quantityValues = new int[quantity + 1];
int counter = 0;
for (int i = 0; i < quantityValues.length; i++) {
quantityValues[i] = counter;
counter++;
quantityList.add(Integer.toString(quantityValues[i]));
}
Bitmap bitmap = BitmapFactory.decodeByteArray(image, 0, image.length);
ivProduct.setImageBitmap(bitmap);
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, quantityList);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerQuantity.setAdapter(adapter);
}
}
}
}
public void addCart(View v) {
cartList.add(new CartItem(name, price,spinnerQuantity.getSelectedItem().toString(), image, id));
Intent productListIntent = new Intent(this, CartActivity.class);
startActivity(productListIntent);
}
推荐答案
这不是最佳实践,但是您可以创建arrayList
It's not the best practice, but you can make your arrayList
public static ArrayList list;
然后您可以使用{class_name} .list从ather活动中访问它.
Then you can access it from ather activity using {class_name}.list
这篇关于如何从Android Studio中获取arraylist的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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