Paypal SDK和Android

我正在尝试在我的应用程序中实现Paypal支付。我从这里得到一个例子： . 当我用eclipse启动应用程序时，一切都很好。 但是，当我在Android Studio V 0.6.0中尝试在我自己的应用程序中添加活动、xml文件和清单时，从昨天起出现了一个错误。 我不能用我按钮中的行android:onClick=onBuyPressed调用我的方法onBuyPressed。 我有一个错误：

06-09 20:57:45.851  10161-10161/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.IllegalStateException: Could not find a method onBuyPressed(View) in the activity class android.view.ContextThemeWrapper for onClick handler on view class android.widget.Button with id 'buyItBtn'
            at android.view.View$1.onClick(View.java:3724)
            at android.view.View.performClick(View.java:4274)
            at android.view.View$PerformClick.run(View.java:17357)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4949)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1043)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:810)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NoSuchMethodException: onBuyPressed [class android.view.View]
            at java.lang.Class.getConstructorOrMethod(Class.java:460)
            at java.lang.Class.getMethod(Class.java:915)
            at android.view.View$1.onClick(View.java:3717)
            at android.view.View.performClick(View.java:4274)
            at android.view.View$PerformClick.run(View.java:17357)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4949)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1043)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:810)
            at dalvik.system.NativeStart.main(Native Method)

你可以在这里看到我的活动：

package net.sparkeek.test.cubydroid.app;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
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.PayPalItem;
import com.paypal.android.sdk.payments.PayPalPayment;
import com.paypal.android.sdk.payments.PayPalPaymentDetails;
import com.paypal.android.sdk.payments.PayPalService;
import com.paypal.android.sdk.payments.PaymentActivity;
import com.paypal.android.sdk.payments.PaymentConfirmation;

import org.json.JSONException;

import java.math.BigDecimal;


public class PaypalActivity extends ActionBarActivity {

    private static final String TAG = "paymentExample";
    /**
     * - 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;

    // note that these credentials will differ between live & sandbox environments.
    private static final String CONFIG_CLIENT_ID = "credential from developer.paypal.com";

    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"));

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_paypal);
        /*Button btnSouscription = (Button)findViewById(R.id.btnSouscription);
        btnSouscription.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onBuyPressed(v);
            }
        });*/

        Intent intent = new Intent(this, PayPalService.class);
        intent.putExtra(PayPalService.EXTRA_PAYPAL_CONFIGURATION, config);
        startService(intent);
    }


    public void onBuyPressed(View v) {
        /*
         * PAYMENT_INTENT_SALE will cause the payment to complete immediately.
         * Change PAYMENT_INTENT_SALE to PAYMENT_INTENT_AUTHORIZE to only authorize payment and
         * capture funds later.
         *
         * Also, to include additional payment details and an item list, see getStuffToBuy() below.
         */
        PayPalPayment thingToBuy = getThingToBuy(PayPalPayment.PAYMENT_INTENT_SALE);

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

        intent.putExtra(PaymentActivity.EXTRA_PAYMENT, thingToBuy);
        startActivityForResult(intent, REQUEST_CODE_PAYMENT);
    }

    private PayPalPayment getThingToBuy(String paymentIntent) {
        return new PayPalPayment(new BigDecimal("1.75"), "USD", "hipster jeans",
                paymentIntent);
    }

    /*
     * This method shows use of optional payment details and item list.
     */
    private PayPalPayment getStuffToBuy(String paymentIntent) {
        PayPalItem[] items =
                {
                        new PayPalItem("old jeans with holes", 2, new BigDecimal("87.50"), "USD",
                                "sku-12345678"),
                        new PayPalItem("free rainbow patch", 1, new BigDecimal("0.00"),
                                "USD", "sku-zero-price"),
                        new PayPalItem("long sleeve plaid shirt (no mustache included)", 6, new BigDecimal("37.99"),
                                "USD", "sku-33333")
                };
        BigDecimal subtotal = PayPalItem.getItemTotal(items);
        BigDecimal shipping = new BigDecimal("7.21");
        BigDecimal tax = new BigDecimal("4.67");
        PayPalPaymentDetails paymentDetails = new PayPalPaymentDetails(shipping, subtotal, tax);
        BigDecimal amount = subtotal.add(shipping).add(tax);
        PayPalPayment payment = new PayPalPayment(amount, "USD", "hipster jeans", paymentIntent);
        return payment.items(items).paymentDetails(paymentDetails);
    }

    @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 {
                        Log.i(TAG, confirm.toJSONObject().toString(4));
                        Log.i(TAG, confirm.getPayment().toJSONObject().toString(4));
                        /**
                         *  TODO: send 'confirm' (and possibly confirm.getPayment() to your server for verification
                         * or consent completion.
                         * See https://developer.paypal.com/webapps/developer/docs/integration/mobile/verify-mobile-payment/
                         * for more details.
                         *
                         * For sample mobile backend interactions, see
                         * https://github.com/paypal/rest-api-sdk-python/tree/master/samples/mobile_backend
                         */
                        Toast.makeText(
                                getApplicationContext(),
                                "PaymentConfirmation info received from PayPal", Toast.LENGTH_LONG)
                                .show();

                    } catch (JSONException e) {
                        Log.e(TAG, "an extremely unlikely failure occurred: ", e);
                    }
                }
            } else if (resultCode == Activity.RESULT_CANCELED) {
                Log.i(TAG, "The user canceled.");
            } else if (resultCode == PaymentActivity.RESULT_EXTRAS_INVALID) {
                Log.i(
                        TAG,
                        "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 (JSONException e) {
                        Log.e("FuturePaymentExample", "an extremely unlikely failure occurred: ", e);
                    }
                }
            } 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) {

        /**
         * TODO: Send the authorization response to your server, where it can
         * exchange the authorization code for OAuth access and refresh tokens.
         *
         * Your server must then store these tokens, so that your server code
         * can execute payments for this user in the future.
         *
         * A more complete example that includes the required app-server to
         * PayPal-server integration is available from
         * https://github.com/paypal/rest-api-sdk-python/tree/master/samples/mobile_backend
         */

    }

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

我的XML文件：

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="net.sparkeek.test.cubydroid.app.PaypalActivity" >

        <Button
            android:id="@+id/buyItBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:onClick="onBuyPressed"
            android:text="Buy a Thing" />

</RelativeLayout>

还有我的舱单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="net.sparkeek.test.cubydroid.app" >

    <!-- for most things, including card.io & paypal -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <!-- for card.io card scanning -->
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.VIBRATE" />

    <uses-feature
        android:name="android.hardware.camera"
        android:required="false" />
    <uses-feature
        android:name="android.hardware.camera.autofocus"
        android:required="false" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/logo_cuby"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".PaypalActivity"
            android:label="@string/title_activity_paypal" >
        </activity>

        <service
            android:name="com.paypal.android.sdk.payments.PayPalService"
            android:exported="false" />

        <activity android:name="com.paypal.android.sdk.payments.PaymentActivity" />
        <activity android:name="com.paypal.android.sdk.payments.LoginActivity" />
        <activity android:name="com.paypal.android.sdk.payments.PaymentMethodActivity" />
        <activity android:name="com.paypal.android.sdk.payments.PaymentConfirmActivity" />
        <activity android:name="com.paypal.android.sdk.payments.PayPalFuturePaymentActivity" />
        <activity android:name="com.paypal.android.sdk.payments.FuturePaymentConsentActivity" />
        <activity android:name="com.paypal.android.sdk.payments.FuturePaymentInfoActivity" />
        <activity
            android:name="io.card.payment.CardIOActivity"
            android:configChanges="keyboardHidden|orientation" />
        <activity android:name="io.card.payment.DataEntryActivity" />
    </application>

</manifest>

---

您的方法是私有的，但getMethod只返回public方法

---

您需要使用getDeclaredMethod。

我认为不需要，因为我在eclipse中有完全相同的代码，并且可以工作。您能提供build.gradle文件的内容以及相关的文件系统结构吗？您正在Android Studio中使用Gradle，对吗？多次编译或包含该库会导致该错误，但我需要更多信息来帮助。