Question

我正在使用以下代码查找此用户是否为高级用户的天气。用户在应用计费中购买的天气与否。但是当我称这种方法为isPremium（）时。它只在第一次给出了正确的结果，但是当我第一次做到这一点时，它总是给出错误的结果。 IInAppBillingService的mService变量为null。有人可以告诉我它可能是什么原因。代码如下。

public boolean isPremium() {
        boolean mIsPremium = false;
        Log.d(TAG, "::isPremium:" + "mService:"+mService);
        if(mService==null){
            return mIsPremium;
        }

        try {
            Bundle ownedItems = mService.getPurchases(3, getPackageName(),
                    "inapp", null);
            if (ownedItems != null) {
                int response = ownedItems.getInt("RESPONSE_CODE");
                if (response == 0) {
                    ArrayList ownedSkus = ownedItems
                            .getStringArrayList("INAPP_PURCHASE_ITEM_LIST");
                    ArrayList purchaseDataList = ownedItems
                            .getStringArrayList("INAPP_PURCHASE_DATA_LIST");
                    ArrayList signatureList = ownedItems
                            .getStringArrayList("INAPP_DATA_SIGNATURE");
                    String continuationToken = ownedItems
                            .getString("INAPP_CONTINUATION_TOKEN");

                    for (int i = 0; i < purchaseDataList.size(); ++i) {
                        String signature = null;
                        String purchaseData = (String) purchaseDataList.get(i);
                        if (signatureList != null)
                            signature = (String) signatureList.get(i);
                        String sku = (String) ownedSkus.get(i);
                        Log.d(TAG, "::isPremium:" + "sku:" + sku);
                        Log.d(TAG, "::isPremium:" + "purchaseData:"
                                + purchaseData);
                        Log.d(TAG, "::isPremium:" + "signature:" + signature);
                        if (sku.equalsIgnoreCase(SKU_PREMIUM)) {
                            Log.d(TAG, "::isPremium:" + "Already Purchased");
                            return true;
                        }

                        // do something with this purchase information
                        // e.g. display the updated list of products owned by
                        // user
                    }

                    // if continuationToken != null, call getPurchases again
                    // and pass in the token to retrieve more items
                }
            }
        } catch (RemoteException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return mIsPremium;
    }

以下是初始化服务的代码。我每次来服务的地方。我只获得“onServiceConnected”日志。并且从未得到日志“：onServiceDisconnected：”

ServiceConnection mServiceConn = new ServiceConnection() {
        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.d(TAG, "::onServiceDisconnected:" + "");
            mService = null;
        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.d(TAG, "::onServiceConnected:" + "");
            mService = IInAppBillingService.Stub.asInterface(service);

        }
    };

那么有人可以让我知道mService在第一次出现后会变成空的原因是什么？我们应该只拨打一次电话吗？我的服务断开了吗？但我在日志中看不到它。

Answer 1

根据你在问题上的说法：

但是当我称这个方法为isPremium（）时。它给出了正确的结果，但是当我第一次这样做的时候。

你的mService第一次可能没有绑定，但它是第二次调用。当你绑定一个服务时，它需要一些时间来建立，这可能是你第二次访问它时你的mService有一个值，isPremium也是如此。

如果查看 this link(Extending the Binder class)，该示例使用布尔值mBound来查看服务是否绑定如下

在服务端

public class IInAppBillingService extends Service {
    // Binder given to clients
    private final IBinder mBinder = new LocalBinder();


    public class LocalBinder extends Binder {
        IInAppBillingService getService() {
        // Return this instance of IInAppBillingService so clients can call public methods
        return IInAppBillingService.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    /** method for clients */
    public Bundle getPurchases(...) {
      //...
    }
}

在活动方面

public class BindingActivity extends Activity {
    IInAppBillingService mService;
    boolean mBound = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    @Override
    protected void onStart() {
        super.onStart();
        // Bind to IInAppBillingService
        Intent intent = new Intent(this, IInAppBillingService.class);
        bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onStop() {
        super.onStop();
        // Unbind from the service
        if (mBound) {
            unbindService(mConnection);
            mBound = false;
        }
    }


    public void doStuff(View v) {
        if (mBound) {
            if(isPremium()){
                 //...
            }
        }
    }

    /** Defines callbacks for service binding, passed to bindService() */
    private ServiceConnection mConnection = new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName className,
             IBinder service) {
            // We've bound to IInAppBillingService, cast the IBinder and get IInAppBillingServiceinstance
            //The connection has been established
            LocalBinder binder = (LocalBinder) service;
            mService = binder.getService();
            //You can use a boolean or you can call to isPremium if you are going to use it once, depends of your scenario
            mBound = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {
            mBound = false;
        }
    };
}

您只发布了isPremium函数，但没有发布初始化mService的方式。如果你没有在上面的链接上扩展binder类，你可以找到不同的方法，一个应该与你使用的相同。

mService第一次变为null。在app bill android

1 个答案: