问题
I would like to distribute my app for free, and then sell extra features that can be added-on later. Is it possible to do this?
回答1:
If you're talking about in-app payment, you should take a look at PayPal, which offers In-App-Payment for Android:
http://www.x.com
https://www.x.com/community/ppx/sdks
If you want to distribute your app via Android Market, you would need to offer each add-on as an invididual app. Probably not a convenient way.
回答2:
Yes you can do it. There are addons all over the market for the better keyboard app.
回答3:
You have different ways you can do this, here are two ways I already tried.
1) You could implement all the features in the app and a key app that unlocks this features. Here is a simple and insecure implementation, the key app and the main app need to be signed with the same key:
public boolean isPackageAvailable(String packageName) {
int sigMatch = getPackageManager().checkSignatures(getPackageName(), packageName);
return sigMatch == PackageManager.SIGNATURE_MATCH;
}
Check MarketEnabler on market-enabler.googlecode.com to see how I used it (not not a secure way but a starting point).
2) You include the plugin app as intent into a subview so it looks like just one app splitted to multiple apk's.
Check http://speakerproximity.googlecode.com where I used it to include the settings view inside the mainview:
....
public class SpeakerProximity extends ActivityGroup {
....
mainLayout.addView(getViewFromIntent("preferences", new Intent(
this, PreferenceScreen.class)));
....
public View getViewFromIntent(String tag, Intent intent) {
/** start an activity inside an ActivityGroup and get the window handler **/
final Window w = getLocalActivityManager().startActivity(tag, intent);
/** extract the view out of the window handler **/
final View wd = w != null ? w.getDecorView() : null;
return wd;
}
...
Note that I extend ActivityGroup and not Activity ;-)
来源：https://stackoverflow.com/questions/4083965/android-is-it-possible-to-sell-add-ons-for-apps-in-the-market