Android應用程序中的PayPal按鈕錯誤

我試圖在我的Android應用程序中的Checkout活動中獲取PayPal按鈕。但是我得到一個空指針異常，它在我的代碼中引用了1585行。該logcat的輸出如下：Android應用程序中的PayPal按鈕錯誤

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OnClick方法貝寶活動代碼如下：

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(); 
        } 
       } 
      }); 
     } 
    }

任何思考什麼可能是錯誤怎麼回事？

來源

2013-03-22 Oliver Smith-Jones

就意味着你TOTAL_GBP是'null'你不能將null作爲構造函數的參數:) – 2013-03-22 21:35:41

@Sergey本納謝謝！什麼樣的價值，我可以分配到TOTAL_GBP呢？如果我將其更改爲int類型，則PayPal會給出「無效支付類型」錯誤！ – 2013-03-22 21:39:02

嘗試通常的payment.setSubtotal（new BigDecimal（「8.25」））;請檢查此鏈接http://androiddevelopement.blogspot.com/2011/04/adding-paypal-payment-in-android.html – 2013-03-22 21:41:56

答案顯然是從評論的回顧：

protected final char[] TOTAL_GBP = null;

不要設置null爲的BigDecimal（TOTAL_GBP）構造函數的參數 @ payment.setSubtotal（新的BigDecimal（TOTAL_GBP））;

示例： payment.setSubtotal(new BigDecimal("8.25")); 從這裏取走http://androiddevelopement.blogspot.com/2011/04/adding-paypal-payment-in-android.html關於paypal和android的集成。

最後但並非最不重要：

你也可能要重新考慮你的AsyncTask過程和doInBackground()方法和你onPostExecute()你平時不設置onClick()聽衆在AsyncTask。他們應該寧願在你的活動和運行在你的主線程然後在一個按鈕點擊你可以呼籲執行AsyncTask。

希望它澄清此事位。

乾杯

來源

2013-03-22 22:06:12

對我的問題的最佳答案！ :) – 2013-03-22 22:09:31

Android應用程序中的PayPal按鈕錯誤

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