为本机接口构建android时出错

Question

我在CodeNameOne中实现了一些原生android贝宝集成代码。来自CodeNameOne的呼叫：

MyNative my = (MyNative)NativeLookup.create(MyNative.class);

在本机接口中：

package com.mycompany.myapp;
import com.codename1.system.NativeInterface;
public interface MyNative extends NativeInterface{   

}

我已经在build_hint下给出了适当的android.xapplication，并在impl类下编写了android代码：

    package com.mycompany.myapp;
    import java.math.BigDecimal;

    import android.app.Activity;
    import android.content.Intent;
    import android.net.Uri;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.view.View.OnClickListener;

    import android.widget.Toast;

    import com.paypal.android.sdk.payments.PayPalAuthorization;
    import com.paypal.android.sdk.payments.PayPalConfiguration;
    import com.paypal.android.sdk.payments.PayPalFuturePaymentActivity;
    import com.paypal.android.sdk.payments.PayPalPayment;
    import com.paypal.android.sdk.payments.PayPalService;
    import com.paypal.android.sdk.payments.PaymentActivity;
    import com.paypal.android.sdk.payments.PaymentConfirmation;

    public class MyNativeImpl extends Activity{
    // private static final String TAG = "paymentdemoblog";
    /**
     * - Set to PaymentActivity.ENVIRONMENT_PRODUCTION to move real money.
     * 
     * - Set to PaymentActivity.ENVIRONMENT_SANDBOX to use your test credentials
     * from https://developer.paypal.com
     * 
     * - Set to PayPalConfiguration.ENVIRONMENT_NO_NETWORK to kick the tires
     * without communicating to PayPal's servers.
     */
    // private static final String CONFIG_ENVIRONMENT =
    // PayPalConfiguration.ENVIRONMENT_NO_NETWORK;
    private static final String CONFIG_ENVIRONMENT = PayPalConfiguration.ENVIRONMENT_SANDBOX;

    // note that these credentials will differ between live & sandbox
    // environments.
    private static final String CONFIG_CLIENT_ID = "Aeqc2X1rBIEUtDNqsaRNr0h1neFo9QnNmfgmpA3D32uSLaHpGJu9NV1KfMnFmy7O-_hV47I7ST0SXDW2";

    private static final int REQUEST_CODE_PAYMENT = 1;
    private static final int REQUEST_CODE_FUTURE_PAYMENT = 2;

    private static PayPalConfiguration config = new PayPalConfiguration()
            .environment(CONFIG_ENVIRONMENT)
            .clientId(CONFIG_CLIENT_ID)
            // The following are only used in PayPalFuturePaymentActivity.
            .merchantName("Hipster Store")
            .merchantPrivacyPolicyUri(
                    Uri.parse("https://www.example.com/privacy"))
            .merchantUserAgreementUri(
                    Uri.parse("https://www.example.com/legal"));

    PayPalPayment thingToBuy;

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

        Intent intent = new Intent(this, PayPalService.class);
        intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, config);
        startService(intent);
        findViewById(R.id.order).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                thingToBuy = new PayPalPayment(new BigDecimal("10"), "USD",
                        "HeadSet", PayPalPayment.PAYMENT_INTENT_SALE);

                Intent intent = new Intent(MyNativeImpl.this,
                        PaymentActivity.class);

                intent.putExtra(PaymentActivity.EXTRA_PAYMENT, thingToBuy);

                startActivityForResult(intent, REQUEST_CODE_PAYMENT);
            }
        });

    }

    public void onFuturePaymentPressed(View pressed) {
        Intent intent = new Intent(MyNativeImpl.this,
                PayPalFuturePaymentActivity.class);

        startActivityForResult(intent, REQUEST_CODE_FUTURE_PAYMENT);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_CODE_PAYMENT) {
            if (resultCode == Activity.RESULT_OK) {
                PaymentConfirmation confirm = data
                        .getParcelableExtra(PaymentActivity.EXTRA_RESULT_CONFIRMATION);
                if (confirm != null) {
                    try {
                        System.out.println(confirm.toJSONObject().toString(4));
                        System.out.println(confirm.getPayment().toJSONObject()
                                .toString(4));

                        Toast.makeText(getApplicationContext(), "Order placed",
                                Toast.LENGTH_LONG).show();

                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            } else if (resultCode == Activity.RESULT_CANCELED) {
                System.out.println("The user canceled.");
            } else if (resultCode == PaymentActivity.RESULT_EXTRAS_INVALID) {
                System.out
                        .println("An invalid Payment or PayPalConfiguration was submitted. Please see the docs.");
            }
        } else if (requestCode == REQUEST_CODE_FUTURE_PAYMENT) {
            if (resultCode == Activity.RESULT_OK) {
                PayPalAuthorization auth = data
                        .getParcelableExtra(PayPalFuturePaymentActivity.EXTRA_RESULT_AUTHORIZATION);
                if (auth != null) {
                    try {
                        Log.i("FuturePaymentExample", auth.toJSONObject()
                                .toString(4));

                        String authorization_code = auth.getAuthorizationCode();
                        Log.i("FuturePaymentExample", authorization_code);

                        sendAuthorizationToServer(auth);
                        Toast.makeText(getApplicationContext(),
                                "Future Payment code received from PayPal",
                                Toast.LENGTH_LONG).show();

                    } catch (Exception e) {
                        Log.e("FuturePaymentExample",
                                "an extremely unlikely failure occurred: ", e);
                                                e.printStackTrace();
                    }
                }
            } else if (resultCode == Activity.RESULT_CANCELED) {
                Log.i("FuturePaymentExample", "The user canceled.");
            } else if (resultCode == PayPalFuturePaymentActivity.RESULT_EXTRAS_INVALID) {
                Log.i("FuturePaymentExample",
                        "Probably the attempt to previously start the PayPalService had an invalid PayPalConfiguration. Please see the docs.");
            }
        }
    }

    private void sendAuthorizationToServer(PayPalAuthorization authorization) {

    }

    public void onFuturePaymentPurchasePressed(View pressed) {
        // Get the Application Correlation ID from the SDK
        String correlationId = PayPalConfiguration
                .getApplicationCorrelationId(this);

        Log.i("FuturePaymentExample", "Application Correlation ID: "
                + correlationId);

        // TODO: Send correlationId and transaction details to your server for
        // processing with
        // PayPal...
        Toast.makeText(getApplicationContext(),
                "App Correlation ID received from SDK", Toast.LENGTH_LONG)
                .show();
    }

    @Override
    public void onDestroy() {
        // Stop service when done
        stopService(new Intent(this, PayPalService.class));
        super.onDestroy();
    }
    public boolean isSupported() {
        return true;
    }

}

失败：生成失败，出现异常。

有谁能帮忙吗...

Answer 1

XML包中没有activity_main，这就是Android中自动生成的R类找不到它的原因。

我还注意到您在impl类中继承了Activity，这是错误的，您应该创建一个单独的Activity类，假设这正是您想要做的（您可能需要与核心代码为One的Activity接口）。

由于我不熟悉PayPal集成，我猜activity_main指的是您自己的活动，也就是CodeNameOneActivity。从这个意义上说，大部分代码都是多余的，因为我们已经生成了这些代码，您只需要将调用绑定到paypal本机代码中。