Android應用程序中的PayPal按鈕錯誤

Question

我正在嘗試在我的Android應用中的“結帳活動”中使用PayPal按鈕。 但是我收到了一個空指針異常，它指向我的代碼中的1585行。 logcat的輸出如下：

03-22 21:27:28.659: W/dalvikvm(419): threadid=1: thread exiting with uncaught exception (group=0x40014760)
03-22 21:27:28.669: E/AndroidRuntime(419): FATAL EXCEPTION: main
03-22 21:27:28.669: E/AndroidRuntime(419): java.lang.NullPointerException
03-22 21:27:28.669: E/AndroidRuntime(419):  at java.math.BigDecimal.<init>(BigDecimal.java:406)
03-22 21:27:28.669: E/AndroidRuntime(419):  at com.fokrul.justdeals.ActivityTab$PaypalTask$1.onClick(ActivityTab.java:1585)
03-22 21:27:28.669: E/AndroidRuntime(419):  at android.view.View.performClick(View.java:3110)
03-22 21:27:28.669: E/AndroidRuntime(419):  at com.paypal.android.MEP.CheckoutButton.onClick(Unknown Source)
03-22 21:27:28.669: E/AndroidRuntime(419):  at android.view.View.performClick(View.java:3110)
03-22 21:27:28.669: E/AndroidRuntime(419):  at android.view.View$PerformClick.run(View.java:11934)
03-22 21:27:28.669: E/AndroidRuntime(419):  at android.os.Handler.handleCallback(Handler.java:587)
03-22 21:27:28.669: E/AndroidRuntime(419):  at android.os.Handler.dispatchMessage(Handler.java:92)
03-22 21:27:28.669: E/AndroidRuntime(419):  at android.os.Looper.loop(Looper.java:132)
03-22 21:27:28.669: E/AndroidRuntime(419):  at android.app.ActivityThread.main(ActivityThread.java:4123)
03-22 21:27:28.669: E/AndroidRuntime(419):  at java.lang.reflect.Method.invokeNative(Native Method)
03-22 21:27:28.669: E/AndroidRuntime(419):  at java.lang.reflect.Method.invoke(Method.java:491)
03-22 21:27:28.669: E/AndroidRuntime(419):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
03-22 21:27:28.669: E/AndroidRuntime(419):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
03-22 21:27:28.669: E/AndroidRuntime(419):  at dalvik.system.NativeStart.main(Native Method)

我的PayPal活動的Onclick方法代碼如下：

class PaypalTask extends AsyncTask<Void, Void, Void> {
        protected final char[] TOTAL_GBP = null;

        public Void doInBackground(Void... arg0) {
            ppObject = PayPal.initWithAppID(getBaseContext(), "APP-80W284485P519543T", PayPal.ENV_SANDBOX);

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            btnPaypal = ppObject.getCheckoutButton(getApplicationContext(), PayPal.BUTTON_278x43, CheckoutButton.TEXT_PAY);
            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            params.addRule(RelativeLayout.CENTER_HORIZONTAL);
            params.addRule(RelativeLayout.CENTER_VERTICAL);
            btnPaypal.setLayoutParams(params);
            rlPay.addView(btnPaypal);
            if(utils.prefs.getBoolean("isLogged", false)) btnPaypal.setVisibility(View.VISIBLE); else btnPaypal.setVisibility(View.GONE);

            btnPaypal.setOnClickListener(new OnClickListener(){
                public void onClick(View view) {

                    // to check whether there are any books in the shopping cart
                    if(!cid.isEmpty()){
                        PayPalPayment payment = new PayPalPayment();
            <<LINE 1585-->>>>> payment.setSubtotal(new BigDecimal(TOTAL_GBP));
                        payment.setCurrencyType("USD");
                        payment.setRecipient(Utils.PAYPAL_ACCOUNT);
                        payment.setPaymentType(PayPal.PAYMENT_TYPE_GOODS);
                        Intent checkoutIntent = PayPal.getInstance().checkout(payment, getBaseContext());
                        startActivityForResult(checkoutIntent, 1);
                    }else{
                        utils.showToast("Your shopping cart is empty.");
                        // The PayPal button needs to be updated so that the user can click on it again.
                        btnPaypal.updateButton();
                    }
                }   
            });
        }
    }

有什么想法可能會出問題嗎？

Answer 1

顯而易見的答案是評論摘要：

protected final char[] TOTAL_GBP = null;

不要將null設置為BigDecimal（TOTAL_GBP）@ payment.setSubtotal（new BigDecimal（TOTAL_GBP））的構造函數參數；

示例： payment.setSubtotal(new BigDecimal("8.25")); 取自http://androiddevelopement.blogspot.com/2011/04/adding-paypal-payment-in-android.html有關Paypal和android集成。

最后但同樣重要的是：

您可能還想重新考慮AsyncTask流程和doInBackground()方法以及onPostExecute() ，而通常無需在AsyncTask設置onClick()偵聽器。 他們寧可必須在您的Activity中並在您的主線程中運行，然后在單擊按鈕時單擊AsyncTask執行即可。

有關AsyncTasks的更多信息： http : //developer.android.com/reference/android/os/AsyncTask.html AsyncTask Android示例

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希望它能使事情有所澄清。

干杯