java - 为每个元素添加一个按钮到 ListView

Question

我正在创建一个购物车应用程序，我正在尝试填充一个名为 items 的 String[] 产品。每个商品都有一个 ID、名称和价格。我遇到的问题是我正在尝试制作自定义 ListView 但无法让它在我的 Android 设备上运行。每次我使用客户 ListView 时，它都会崩溃。也许我做得不对，或者我还需要创建一个客户适配器？我尝试过这些方法，但都没有成功。这是我所拥有的，我目前正在使用 simple_list_item_check 布局，但我只是实现了它，看看它是否有效，其中确实有效。 android 的简单布局可以，但我的自定义不会。有人能引导我走向正确的方向吗？

CustomerView.activity

    import android.support.v7.app.ActionBarActivity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.ListAdapter;
    import android.widget.ListView;
    import android.widget.Toast;
    import android.widget.CheckedTextView;


    public class CustomerView extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_customer_view);

    Product[] items = {
            new Product(1, "Milk", 21.50),
            new Product(2, "Butter", 15.99),
            new Product(3, "Yogurt", 14.90),
            new Product(4, "Toothpaste", 7.99),
            new Product(5, "Ice Cream", 10.00),

    };

    final ListAdapter theAdapter = new ArrayAdapter<>(this,
            android.R.layout.simple_list_item_checked, items);

    ListView customerlist = (ListView) findViewById(R.id.customerList);
    customerlist.setTextFilterEnabled(true);
    customerlist.setAdapter(theAdapter);
    customerlist.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            CheckedTextView check = (CheckedTextView)view;
            check.setChecked(!check.isChecked());
            String itemselected = "You Touched " +
                  String.valueOf(theAdapter.getItem(position));

            Toast.makeText(CustomerView.this, itemselected, Toast.LENGTH_SHORT).show();

        }
    });

}





@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_customer_view, 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.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

产品.java

    public class Product {

private int id;
private String name;
private double price;
private boolean selected;


public Product(int id, String name, double price) {
    this.id = id;
    this.name = name;
    this.price = price;

}

@Override
public String toString() {
    return this.id + " " + this.name + " [$" + this.price + "]";
}
}

row_layout.xml

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
tools:context="shoppingcart.cop4331.com.shoppingcart.CustomerView">


<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Add to Cart"
    android:gravity="right"
    />


<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/textview1"
    android:textSize="20sp"/>



    </LinearLayout>

Answer 1

换行:

final ListAdapter theAdapter = new ArrayAdapter<>(this,
        android.R.layout.simple_list_item_checked, items);

至:

final ListAdapter theAdapter = new ArrayAdapter<>(this,
           R.layout.row_layout , R.id.textview1, items);

您使用了错误的 ArrayAdapter 构造函数:)如果 Root View 不是 TextView (在您的情况下 Root View 是 LinearLayout)，您必须传递 TextView id