How to use

getDefaultDialerPackage

method

in

android.telecom.TelecomManager

private boolean isPackageDefaultDialer(String packageName) {
 TelecomManager telecomManager =
   (TelecomManager) context.getSystemService(Context.TELECOM_SERVICE);
 return packageName.equals(telecomManager.getDefaultDialerPackage());
}

@Test
@Config(minSdk = M)
public void setDefaultDialerPackage() {
 shadowOf(telecomService).setDefaultDialer("some.package");
 assertThat(telecomService.getDefaultDialerPackage()).isEqualTo("some.package");
}

private boolean isPackageDefaultDialer(String packageName) {
 TelecomManager telecomManager =
   (TelecomManager) context.getSystemService(Context.TELECOM_SERVICE);
 return packageName.equals(telecomManager.getDefaultDialerPackage());
}

/**
 * Used to determine the currently selected default dialer package.
 *
 * @param telecomManager the {@link TelecomManager} used for method calls, if possible.
 * @return package name for the default dialer package or null if no package has been
 *         selected as the default dialer.
 */
@Nullable
public static String getDefaultDialerPackage(@Nullable TelecomManager telecomManager) {
  if (telecomManager != null && CompatUtils.isDefaultDialerCompatible()) {
    return telecomManager.getDefaultDialerPackage();
  }
  return null;
}