import org.solovyev.android.checkout.Billing; //导入依赖的package包/类
@Override
protected void function() {
    final Adapter adapter = new Adapter();
    mInventoryCallback = new InventoryCallback(adapter);
    String ateKey = Helper.getATEKey(this);
    int colorAccent = Config.accentColor(this, ateKey);
    rv.setPopupBgColor(colorAccent);
    rv.setItemAnimator(new DefaultItemAnimator());
    CustomLayoutManager customLayoutManager = new CustomLayoutManager(this);
    customLayoutManager.setSmoothScrollbarEnabled(true);
    rv.setLayoutManager(customLayoutManager);
    rv.addItemDecoration(new DividerItemDecoration(this, 75, false));
    rv.setHasFixedSize(true);
    rv.setAdapter(adapter);
    final Billing billing = MusicXApplication.get(this).getmBilling();
    mCheckout = Checkout.forActivity(this, billing);
    mCheckout.start();
    reloadInventory();
}
 

import org.solovyev.android.checkout.Billing; //导入依赖的package包/类
@Nonnull
public Billing getmBilling() {
    return mBilling;
}
 

import org.solovyev.android.checkout.Billing; //导入依赖的package包/类
public CheckoutInternal(@NonNull Context context, @NonNull Products products) {
    mBilling = new Billing(context, new Configuration());
    mCheckout = Checkout.forApplication(mBilling, products);
}
 

import org.solovyev.android.checkout.Billing; //导入依赖的package包/类
@NonNull
public Billing getBilling() {
    return mBilling;
}
 

import org.solovyev.android.checkout.Billing; //导入依赖的package包/类
public Billing getBilling() {
    return billing;
}
 

import org.solovyev.android.checkout.Billing; //导入依赖的package包/类
@Override
public Cache getCache() {
    return Billing.newCache();
}