(Android™) Wait for Async Method to Complete

Demonstrates using the Wait method to wait for an asynchronous method to complete. This example will do an SFTP upload (over SSH) and will use the Async version of each method. Obviously, waiting for the async method to complete is the same as making a synchronous call, but an application wouldn't typically do this. An application might, for example, do other things as a background task is running, and then later wait for the task to complete.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // All Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob = new CkGlobal();
    boolean success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        Log.i(TAG, chilkatGlob.lastErrorText());
        return;
        }

    CkSFtp sftp = new CkSFtp();

    // Set some timeouts, in milliseconds:
    sftp.put_ConnectTimeoutMs(15000);
    sftp.put_IdleTimeoutMs(15000);
    int waitMaxMs = 30000;

    // Connect to the SSH server.  
    // The standard SSH port = 22
    // The hostname may be a hostname or IP address.
    int port = 22;
    String hostname = "www.my-ssh-server.com";

    CkTask task = sftp.ConnectAsync(hostname,port);
    if (sftp.get_LastMethodSuccess() == false) {
        Log.i(TAG, sftp.lastErrorText());
        return;
        }

    // Start the background task.
    success = task.Run();
    if (!success) {
        Log.i(TAG, task.lastErrorText());
        }

    // Wait for the connect task to finish.
    // The true/false returned by Wait applies to the Wait method call, not the task.
    success = task.Wait(waitMaxMs);
    if (!success or (task.get_StatusInt() != 7) or (task.get_TaskSuccess() != true)) {
        if (!success) {
            // The task.LastErrorText applies to the Wait method call.
            Log.i(TAG, task.lastErrorText());
            }
        else {
            // The ResultErrorText applies to the underlying task method call (i.e. the Connect)
            Log.i(TAG, task.status());
            Log.i(TAG, task.resultErrorText());
            }

        return;
        }

    // Authenticate with the SSH server.  Chilkat SFTP supports
    // both password-based authenication as well as public-key
    // authentication.  This example uses password authenication.
    task = sftp.AuthenticatePwAsync("myLogin","myPassword");
    // To keep the example short, we'll skip handling failures.
    // The failures would be handled in the same way as shown above.

    success = task.Run();
    success = task.Wait(waitMaxMs);

    // After authenticating, the SFTP subsystem must be initialized:
    task = sftp.InitializeSftpAsync();
    success = task.Run();
    success = task.Wait(waitMaxMs);

    // Upload from the local file to the SSH server.
    // Important -- the remote filepath is the 1st argument,
    // the local filepath is the 2nd argument;
    String remoteFilePath = "hamlet.xml";
    String localFilePath = "c:/temp/hamlet.xml";

    task = sftp.UploadFileByNameAsync(remoteFilePath,localFilePath);
    if (sftp.get_LastMethodSuccess() == false) {
        Log.i(TAG, sftp.lastErrorText());
        return;
        }

    success = task.Run();
    success = task.Wait(waitMaxMs);
    if (!success or (task.get_StatusInt() != 7) or (task.get_TaskSuccess() != true)) {
        if (!success) {
            // The task.LastErrorText applies to the Wait method call.
            Log.i(TAG, task.lastErrorText());
            }
        else {
            // The ResultErrorText applies to the underlying task method call (i.e. the Connect)
            Log.i(TAG, task.status());
            Log.i(TAG, task.resultErrorText());
            }

        return;
        }

    Log.i(TAG, "File uploaded.");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}