java - Android - 检查某些值不

Question

我正在处理 Android 计费并尝试正确设置 onPurchaseStateChange 方法，但它似乎不起作用。

    @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”并且purchaseState==PurchaseState.PURCHASED ....出于某种原因，它似乎没有进入该if语句，并且没有执行去的 Intent 下一页？

有人知道为什么会发生这种情况吗？看起来很奇怪。这可能是 Java 的事情吗？

谢谢!

Answer 1

PurchaseState 不是像 int、long、float 等原始数据类型，因此您应该使用:

purchaseState.equals(PurchaseState.PURCHASED)

而不是 ==，就像使用字符串一样:

string1.equals(string2) // Results you expect

不等于

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