gistfile1.java

public class ReferrerReceiver extends BroadcastReceiver {
	
    private static final String INSTALL_REFERRER_ACTION = "com.android.vending.INSTALL_REFERRER";
    private static final String PREF_REFERRER = "referrer";
    private static final String PREF_RAW_REFERRER = "raw_referrer";
	
    private static final String ENCODING = "UTF-8";
	
    public ReferrerReceiver() {
        super();
    }
 
    @Override 
    public void onReceive(Context context, Intent intent) {
        try {
            if (intent != null 
                    && intent.getAction().equals(INSTALL_REFERRER_ACTION)) {            	
                String rawReferrer = intent.getStringExtra(PREF_REFERRER);
                if (rawReferrer != null) {
                    String referrer = URLDecoder.decode(rawReferrer, ENCODING);
                    ReferrerReceiver.setReferrer(context, referrer);
                    Uri referrerUri = Uri.parse("localhost?" + referrer);
                    if (referrerUri != null) {
                        String value = referrerUri.getQueryParameter("[KEY]");
                    }
                }
            }
        }
        catch (Exception e) {
        }        
    }
    
    public static void setReferrer(Context context, String referrer) {
        SharedPreferences pref = context.getSharedPreferences(
            PREF_REFERRER, Context.MODE_PRIVATE);
        Editor editor = pref.edit();		
        editor.putString(PREF_RAW_REFERRER, referrer);
        editor.commit();  
    }
	
    public static String getReferrer(Context context) {
	    SharedPreferences pref = context.getSharedPreferences(
            PREF_REFERRER, Context.MODE_PRIVATE);    	
        return pref.getString(PREF_RAW_REFERRER, null);
    }	
}