Sample_of_IapDelegateActivity.java

public class IapDelegateActivity extends AppCompatActivity {
    /**
     * The IAP task is successful.
     */
    public static final String ACTION_IAP_OK = "my.intent.action.IAP_OK";
    /**
     * The IAP task is failed.
     */
    public static final String ACTION_IAP_CANCELED = "my.intent.action.IAP_CANCELED";

    public static final String PARAMS_SKU = "PARAMS_SKU";
    public static final String PARAMS_SKU_PRICE = "PARAMS_SKU_PRICE";

    String mSku;
    float mSkuPrice;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final Intent intent = getIntent();
        mSku = intent.getStringExtra(PARAMS_SKU);
        mSkuPrice = intent.getFloatExtra(PARAMS_SKU_PRICE, 0f);
    }
    
    @Override
    protected void onStart() {
        super.onStart();

        // TODO: Handle the IAP task.
    }

    @Override
    protected void onStop() {
        super.onStop();

        // TODO: Interrupt the IAP task if necessary.
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        // TODO: Save the SKU and SKU price in case the "Don't Keep Activity"
        // TODO: is enabled.
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedState) {
        super.onRestoreInstanceState(savedState);

        // TODO: Restore the SKU and SKU price.
    }

    @Override
    protected void onActivityResult(int requestCode,
                                    int resultCode,
                                    Intent data) {
        if (resultCode == RESULT_OK) {
            // Notify the subscribers.
            sendBroadcast(
                new Intent(ACTION_IAP_OK)
                    .putExtra(PARAMS_SKU, mSku)
                    .putExtra(PARAMS_SKU_PRICE, mSkuPrice));
        } else {
            // Notify the subscribers.
            sendBroadcast(
                new Intent(ACTION_IAP_CANCELED)
                    .putExtra(PARAMS_SKU, mSku)
                    .putExtra(PARAMS_SKU_PRICE, mSkuPrice));
        }

        setResult(resultCode);
        finish();
    }
}