使用 Intent 传递 ListView

Question

我创建了一个列表视图，其中包含 -

• “婴儿用品”
• “面包店”
• “烘焙”
• “饮料”
• “罐头食品”
• “麦片早餐”
• “调味品”
• “乳制品”
• “冷冻食品”
• “杂项”
• “非食品”
• “意大利面/米饭”
• “零食”

然后，我还想为每个列表视图创建一个 onClick 布局。

如果我单击 Shopping Items (ListView) 中的 Baby Items，如何将 Intent 用于 Baby_Items 布局

购物项目 (JAVA)

public class ShoppingItems extends ActionBarActivity {
ListView listView;
ArrayAdapter<String> adapter;
String[] item_category = {"Baby Items", "Bakery", "Baking",
        "Beverages", "Canned Goods", "Cereal Breakfast", "Condiments",
        "Dairy", "Frozen Foods", "Miscellaneous", "Non-Food Items",
        "Pasta / Rice", "Snacks"};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_shopping_items);
    listView = (ListView) findViewById(R.id.list_view);
    adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,item_category);
    listView.setAdapter(adapter);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(getBaseContext(),parent.getItemAtPosition(position)+ " is selected",Toast.LENGTH_LONG).show();
        }
    });

}

BABY_ITEMS (JAVA)

public class Baby_Items extends ActionBarActivity {

ArrayList<Products> products = new ArrayList<Products>();
ListAdapter boxAdapter;
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_baby__items);

    ListView lvMain = (ListView) findViewById(R.id.lvbabyitems);
    lvMain.setAdapter(boxAdapter);
}

void fillData() {
    for (int i = 1; i <= 20; i++) {
        products.add(new Products("Products " + i, i * 100, false));

    }
}

public void showResult(View v) {
    String result = "Selected Product are :";
    int totalAmount=0;
    for (Products p : boxAdapter.getBox()) {
        if (p.box){
            result += "\n" + p.name;
            totalAmount+=p.price;
        }
    }
    Toast.makeText(this, result+"\n"+"Total Amount:="+totalAmount, Toast.LENGTH_LONG).show();
}

Answer 1

查看this tutorial 了解有关ListView 实现的基础知识。您可以使用Intent 在ListView 项目点击上开始新的Activity。

Answer 2

在 onClick 方法中试试这个

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(getBaseContext(),parent.getItemAtPosition(position)+ " is selected",Toast.LENGTH_LONG).show();

             Intent intent = new Intent(ShoppingItems.this, Baby_Items.class);
            intent.putExtra("baby_item", "" + parent.getItemAtPosition(position));
            startActivity(intent);
        }
    });

并在 Baby_Items 活动中获取额外的数据，例如

if (getIntent().getExtras().containsKey("baby_item")) {

            String item = getIntent().getStringExtra("baby_item");

        }