AccountUtils.java

package org.michenux.drodrolib.accounts;

import android.text.TextUtils;

public class AccountUtils {

    public static String buildAccountType(String flavor, String accountName, boolean debug) {
        StringBuilder authority = new StringBuilder();
        if ( !TextUtils.isEmpty(flavor)) {
            authority.append(flavor);
            authority.append('.');
        }
        authority.append(accountName);
        if (debug) {
            authority.append(".debug");
        }
        return authority.toString();
    }
}

ContentProviderUtils.java

package org.michenux.drodrolib.content;

import android.text.TextUtils;

public class ContentProviderUtils {

    public static String buildAuthority( String packageName, String flavor, String name) {
        StringBuilder authority = new StringBuilder(packageName);
        if ( !TextUtils.isEmpty(flavor)) {
            authority.append('.');
            authority.append(flavor);
        }
        authority.append('.');
        authority.append(name);
        return authority.toString();
    }
}

Example of use

private static final String AUTHORITY = ContentProviderUtils.buildAuthority(
            BuildConfig.PACKAGE_NAME, BuildConfig.FLAVOR, "friends");

public static final String ACCOUNT_TYPE = AccountUtils.buildAccountType(
	BuildConfig.FLAVOR, "michenux.net", BuildConfig.DEBUG);