Android: Get the app installer package name

installer_package.java

private static final String UNKNOWN_VALUE = "unknown";
/**
 * Get Installer Id for the app
 *
 * @param context An instance of the application {@link Context}
 * @return The installer Id of the installer for the app
 */
public static String getInstallSource(Context context) {
  try {
    PackageManager pm = context.getPackageManager();
    String installerId = pm.getInstallerPackageName(context.getPackageName());
    return TextUtils.isEmpty(installerId) ? UNKNOWN_VALUE : installerId;
  } catch (Throwable e) {
    //intentionally kept empty
  }
  return UNKNOWN_VALUE;
}