Detect if an Android app was downloaded from Google Play vs Amazon vs Other

Question

I know this is probably a longshot, but is there any way to detect programatically whether an app was hosted on the Amazon apps store vs on Google Play? I would like to link to the app store the app was downloaded from, and I'd rather not have two different APKs with just this difference if it can be avoided.

Answer 1

As of just recently, the Amazon Appstore returns sane values for PackageManager.getInstallerPackageName()

PackageManager pm = context.getPackageManager();
String installerPackageName = pm.getInstallerPackageName(context.getPackageName());

if ("com.android.vending".equals(installerPackageName)) {
    //do google things
} else if ("com.amazon.venezia".equals(installerPackageName)) {
    //do amazon things
}

See here: https://forums.developer.amazon.com/forums/thread.jspa?threadID=680

Examples for rate this app links:

Google Play-

market://details?id=PACKAGANAME

Amazon Store

http://www.amazon.com/gp/mas/dl/android?p=PACKAGENAME

or

amzn://apps/android?p=com.amazon.mp3

Answer 2

The easiest way is to use different version codes or names between Amazon and Google Play. Then you can use PackageManager.getPackageInfo to retrieve those values and choose the app store link appropriately from there.

Example: suffix all of your Amazon version names with '.65' i.e., 1.0.65. Then use

public boolean isAmazon(Context context) {
    String versionName = "";
    try {
        versionName = context.getPackageManager().getPackageInfo(
            getPackageName(), 0).versionName;
    } catch (NameNotFoundException e) {
        // Can't find itself...
    }
    return versionName.endsWith(".65");
}