Question

我有一个有两个CardViews的活动布局： CardView1有1个ListView CardView2有1个整数（最终金额）

public class CheckoutActivity extends BaseAppCompatActivity implements AmountUpdateListener{

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

private void populateSevicesInCart() {
    ListView view = (ListView) findViewById(R.id.listView_content_checkout_cartItemsListView);
    List<Service> services = CartDataAccessUtil.getServicesInCart();
    CheckoutListServicesAdapter checkoutListServicesAdapter = new CheckoutListServicesAdapter(this, this, services);
    view.setAdapter(checkoutListServicesAdapter);
}

public void updateAmountPayable(Integer grandTotal){
    TextView textViewAmountPayable = (TextView) findViewById(R.id.textView_content_checkout_amount_payable);
    textViewAmountPayable.setText(grandTotal);
}

布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.callsalon.activity.CheckoutActivity"
tools:showIn="@layout/activity_checkout"
android:orientation="vertical"
android:id="@+id/linearLayout_content_checkout_mainContent">
<android.support.v7.widget.CardView
    android:layout_margin="10dp"
    android:paddingTop="10dp"
    card_view:cardElevation="5dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <ListView
        android:layout_margin="8dp"
        android:id="@+id/listView_content_checkout_cartItemsListView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>
</android.support.v7.widget.CardView>

<android.support.v7.widget.CardView
    android:layout_margin="10dp"
    android:paddingTop="10dp"
    card_view:cardElevation="5dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
        <TextView
            android:id="@+id/textView_content_checkout_amount_payable"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:layout_weight="0.5"
            android:gravity="right"
            android:text="Rs. 0"
            android:textColor="@color/grey" />

</android.support.v7.widget.CardView>

</LinearLayout>

适配器

public class CheckoutListServicesAdapter extends BaseAdapter {

    private List<Service> services;
    private static LayoutInflater inflater;
    private Context context;
    private CostAmounts costAmounts;
    private AmountUpdateListener listener;

    public CostAmounts getCostAmounts() {
        return costAmounts;
    }

    public CheckoutListServicesAdapter(Context context, AmountUpdateListener listener, List<Service> services) {
        super();
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        this.context = context;
        this.services = services;
        this.listener = listener;
        updateCostAmounts(services);
    }

    private void updateCostAmounts(List<Service> services){
        costAmounts = new CostAmounts(services);
        listener.updateAmountPayable(costAmounts.getGrandTotal());

        User currentUser = UserDataAccessUtil.getUser();
        currentUser.setAmountPayable(costAmounts.getGrandTotal());
        UserDataAccessUtil.updateUser(currentUser);
    }

    @Override
    public int getCount() {
        ...
    }

    @Override
    public Object getItem(int position) {
        ..
    }

    @Override
    public long getItemId(int position) {
        ..
    }

    @Override
    public View getView(final int position, final View convertView, ViewGroup parent) {
        removeButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    services = CartDataAccessUtil.getServicesInCart();
                    updateCostAmounts(services);
                    notifyDataSetChanged();
                }
            });
        }
        return serviceListRow;
    }
}

在Activity onCreate中，我为CardView1的ListView设置了适配器。我的ListView有一个删除按钮。一旦我单击删除按钮，CardView1表现完美，但我想每次从ListView中删除项目时更新CardView2中的整数。

我试过了：

1）在RemoveButton onClick中，保存上下文对象并尝试context.findViewById（R.id.final_amount）。上下文没有findViewById方法

2）创建了一个名为amountUpdatedListener的接口，在Activity中实现了该方法。将侦听器传递给适配器并调用listener.amountUpdated（finalAmount），但仍然没有说出ResourceNotFoundException。

Answer 1

您正在将Integer设置为TextView

 textViewAmountPayable.setText(grandTotal);

更改为

 textViewAmountPayable.setText(String.valueOf(grandTotal.intValue()));

setText查找具有id的资源。 Id是整数。如果没有找到，你会得到ResourceNorFoundException。

你需要的是CharacerSequence。看看@ setText方法@ http://developer.android.com/reference/android/widget/TextView.html

在自定义适配器充气后找不到Android资源

1 个答案: