java - Android-检查某些值不

我正在处理Android帐单，并尝试正确设置onPurchaseStateChange方法，但是它似乎无法正常工作。

    @Override
    public void onPurchaseStateChange(PurchaseState purchaseState, String itemId,
            int quantity, long purchaseTime, String developerPayload)
    {
        if (purchaseState == PurchaseState.PURCHASED)
        {
            mOwnedItems.add(itemId);

            if ( itemId != null && itemId.trim().equals("3") )
            {
                  Intent myIntent = new Intent(ExtraHelpActivity.this, PsychologyActivity.class);
                  ExtraHelpActivity.this.startActivity(myIntent);
            }
            if ( itemId != null && itemId.trim().equals("4") )
            {
                  Intent myIntent = new Intent(ExtraHelpActivity.this, NumberOfBusinessesActivity.class);
                  ExtraHelpActivity.this.startActivity(myIntent);
            }
        }
        else
        if (purchaseState == PurchaseState.CANCELED)
        {
            // purchase canceled
        }
        else
        if (purchaseState == PurchaseState.REFUNDED)
        {
            // user ask for a refund
        }
        else
        {
            if ( itemId != null && itemId.equals("3") )
            {
                  Intent myIntent = new Intent(ExtraHelpActivity.this, PsychologyActivity.class);
                  ExtraHelpActivity.this.startActivity(myIntent);
            }
            if ( itemId != null && itemId.equals("4") )
            {
                  Intent myIntent = new Intent(ExtraHelpActivity.this, NumberOfBusinessesActivity.class);
                  ExtraHelpActivity.this.startActivity(myIntent);
            }
        }

因此，当purchaseId为“ 4”或“ 3”且purchaseState == PurchaseState.PURCHASED ....出于某种原因，它似乎未进入该if语句，并且不执行进入下一页的意图？

谁知道为什么会这样吗？看起来很奇怪。难道是Java的事情吗？

谢谢！

最佳答案

PurchaseState不是类似于int，long，float等的原始数据类型，因此应使用：

purchaseState.equals(PurchaseState.PURCHASED)

代替==，就像您使用Strings一样：

string1.equals(string2) // Results you expect

与...不同

string1 == string2 // Don't do this...

关于java - Android-检查某些值不，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/12134079/