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/**
 * Sample patch Worker using {@link ProviderInstaller}.
 */
class PatchWorker(appContext: Context, workerParams: WorkerParameters): Worker(appContext, workerParams) {

  override fun doWork(): Result {
        try {
            ProviderInstaller.installIfNeeded(context)
        } catch (e: GooglePlayServicesRepairableException) {

            // Indicates that Google Play services is out of date, disabled, etc.

            // Prompt the user to install/update/enable Google Play services.
            GoogleApiAvailability.getInstance()
                    .showErrorNotification(context, e.connectionStatusCode)

            // Notify the WorkManager that a soft error occurred.
            return Result.failure()

        } catch (e: GooglePlayServicesNotAvailableException) {
            // Indicates a non-recoverable error; the ProviderInstaller can't
            // install an up-to-date Provider.

            // Notify the WorkManager that a hard error occurred.
            return Result.failure()
        }


        // If this is reached, you know that the provider was already up to date
        // or was successfully updated.
        return Result.success()
    }
}

/**
 * Sample patch Worker using {@link ProviderInstaller}.
 */
public class PatchWorker extends Worker {

  ...

  @Override
  public Result doWork() {
    try {
      ProviderInstaller.installIfNeeded(getContext());
    } catch (GooglePlayServicesRepairableException e) {

      // Indicates that Google Play services is out of date, disabled, etc.

      // Prompt the user to install/update/enable Google Play services.
      GoogleApiAvailability.getInstance()
              .showErrorNotification(context, e.connectionStatusCode)

      // Notify the WorkManager that a soft error occurred.
      return Result.failure();

    } catch (GooglePlayServicesNotAvailableException e) {
      // Indicates a non-recoverable error; the ProviderInstaller can't
      // install an up-to-date Provider.

      // Notify the WorkManager that a hard error occurred.
      return Result.failure();
    }

    // If this is reached, you know that the provider was already up to date
    // or was successfully updated.
    return Result.success();
  }
}

private const val ERROR_DIALOG_REQUEST_CODE = 1

/**
 * Sample activity using {@link ProviderInstaller}.
 */
class MainActivity : Activity(), ProviderInstaller.ProviderInstallListener {

    private var retryProviderInstall: Boolean = false

    // Update the security provider when the activity is created.
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        ProviderInstaller.installIfNeededAsync(this, this)
    }

    /**
     * This method is only called if the provider is successfully updated
     * (or is already up to date).
     */
    override fun onProviderInstalled() {
        // Provider is up to date; app can make secure network calls.
    }

    /**
     * This method is called if updating fails. The error code indicates
     * whether the error is recoverable.
     */
    override fun onProviderInstallFailed(errorCode: Int, recoveryIntent: Intent) {
        GoogleApiAvailability.getInstance().apply {
            if (isUserResolvableError(errorCode)) {
                // Recoverable error. Show a dialog prompting the user to
                // install/update/enable Google Play services.
                showErrorDialogFragment(this@MainActivity, errorCode, ERROR_DIALOG_REQUEST_CODE) {
                    // The user chose not to take the recovery action.
                    onProviderInstallerNotAvailable()
                }
            } else {
                onProviderInstallerNotAvailable()
            }
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int,
                                  data: Intent) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == ERROR_DIALOG_REQUEST_CODE) {
            // Adding a fragment via GoogleApiAvailability.showErrorDialogFragment
            // before the instance state is restored throws an error. So instead,
            // set a flag here, which causes the fragment to delay until
            // onPostResume.
            retryProviderInstall = true
        }
    }

    /**
     * On resume, check whether a flag indicates that the provider needs to be
     * reinstalled.
     */
    override fun onPostResume() {
        super.onPostResume()
        if (retryProviderInstall) {
            // It's safe to retry installation.
            ProviderInstaller.installIfNeededAsync(this, this)
        }
        retryProviderInstall = false
    }

    private fun onProviderInstallerNotAvailable() {
        // This is reached if the provider can't be updated for some reason.
        // App should consider all HTTP communication to be vulnerable and take
        // appropriate action.
    }
}

/**
 * Sample activity using {@link ProviderInstaller}.
 */
public class MainActivity extends Activity
    implements ProviderInstaller.ProviderInstallListener {

  private static final int ERROR_DIALOG_REQUEST_CODE = 1;

  private boolean retryProviderInstall;

  // Update the security provider when the activity is created.
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ProviderInstaller.installIfNeededAsync(this, this);
  }

  /**
   * This method is only called if the provider is successfully updated
   * (or is already up to date).
   */
  @Override
  protected void onProviderInstalled() {
    // Provider is up to date; app can make secure network calls.
  }

  /**
   * This method is called if updating fails. The error code indicates
   * whether the error is recoverable.
   */
  @Override
  protected void onProviderInstallFailed(int errorCode, Intent recoveryIntent) {
    GoogleApiAvailability availability = GoogleApiAvailability.getInstance();
    if (availability.isUserRecoverableError(errorCode)) {
      // Recoverable error. Show a dialog prompting the user to
      // install/update/enable Google Play services.
      availability.showErrorDialogFragment(
          this,
          errorCode,
          ERROR_DIALOG_REQUEST_CODE,
          new DialogInterface.OnCancelListener() {
            @Override
            public void onCancel(DialogInterface dialog) {
              // The user chose not to take the recovery action.
              onProviderInstallerNotAvailable();
            }
          });
    } else {
      // Google Play services isn't available.
      onProviderInstallerNotAvailable();
    }
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode,
      Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == ERROR_DIALOG_REQUEST_CODE) {
      // Adding a fragment via GoogleApiAvailability.showErrorDialogFragment
      // before the instance state is restored throws an error. So instead,
      // set a flag here, which causes the fragment to delay until
      // onPostResume.
      retryProviderInstall = true;
    }
  }

  /**
  * On resume, check whether a flag indicates that the provider needs to be
  * reinstalled.
  */
  @Override
  protected void onPostResume() {
    super.onPostResume();
    if (retryProviderInstall) {
      // It's safe to retry installation.
      ProviderInstaller.installIfNeededAsync(this, this);
    }
    retryProviderInstall = false;
  }

  private void onProviderInstallerNotAvailable() {
    // This is reached if the provider can't be updated for some reason.
    // App should consider all HTTP communication to be vulnerable and take
    // appropriate action.
  }
}