Google Play In-app BillingをAPI v3のサンプルを使って楽して導入する ref: http://qiita.com/items/39dff3374e2292a1daed

file0.txt

public abstract class BaseActivity extends SherlockFragmentActivity {

    private static final String SKU_PREMIUM = "Developer Consoleで設定したproduct id";
    private static final int REQUEST_CODE_PURCHASE_PREMIUM = よしなにリクエストコードを;
    private static final String BILLING_PUBLIC_KEY = "Developer Consoleで得られるBase64encodedな公開鍵（そのままコードに持たせず別の形からデコードなりして持ってくるのが推奨されている";

    private IabHelper mBillingHelper;
    private boolean mIsPremium = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ~~
        setupBilling();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        tearDownBilling();
    }

    private void setupBilling() {
        mBillingHelper = new IabHelper(this, BILLING_PUBLIC_KEY);
        mBillingHelper.enableDebugLogging(true); // Remove before release
        mBillingHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
            public void onIabSetupFinished(IabResult result) {
                Log.d("billing", "Setup finished.");
                if (result.isFailure()) return;
                Log.d("billing", "Setup successful. Querying inventory.");
                mBillingHelper.queryInventoryAsync(mGotInventoryListener);
            }
        });
    }

    private void tearDownBilling() {
        if (mBillingHelper != null) mBillingHelper.dispose();
        mBillingHelper = null;
    }

    private IabHelper.QueryInventoryFinishedListener mGotInventoryListener = new IabHelper.QueryInventoryFinishedListener() {
        public void onQueryInventoryFinished(IabResult result, Inventory inventory) {
            Log.d("billing", "Query inventory finished.");
            if (result.isFailure()) return;
            Log.d("billing", "Query inventory was successful.");
            mIsPremium = inventory.hasPurchase(SKU_PREMIUM);
            Log.d("billing", "User is " + (mIsPremium ? "PREMIUM" : "NOT PREMIUM"));
        }
    };

    private IabHelper.OnIabPurchaseFinishedListener mPurchaseFinishedListener = new IabHelper.OnIabPurchaseFinishedListener() {
        public void onIabPurchaseFinished(IabResult result, Purchase purchase) {
            Log.d("billing", "Purchase finished: " + result + ", purchase: " + purchase);
            if (result.isFailure()) return;
            Log.d("billing", "Purchase successful.");
            if (purchase.getSku().equals(SKU_PREMIUM)) {
                Log.d("billing", "Purchase is premium upgrade. Congratulating user.");
                mIsPremium = true;
            }
        }
    };

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (!mBillingHelper.handleActivityResult(requestCode, resultCode, data)) {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

    protected void requestBilling() {
        mBillingHelper.launchPurchaseFlow(this, SKU_PREMIUM, REQUEST_CODE_PURCHASE_PREMIUM, mPurchaseFinishedListener);
    }

    protected boolean isPremiumUser() {
        return this.mIsPremium;
    }
}