Android Open Source - Android-Wizard-Framework Validation Async Task

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License

The source code is released under:

MIT License

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Java Source Code

package com.hps.wizard;
/* w w w . j  av a  2 s .  c  o  m*/
import android.os.AsyncTask;

/**
 * <p>
 * A task which allows a {@link StateFragment} to run validation in the background. For the most part it simply pushes events up to the {@link TaskCallback},
 * which must be set by {@link #setCallback(TaskCallback)} to avoid null pointer exceptions.
 * </p>
 * <p>
 * <h2>Usage</h2>
 * 
 * <pre>
 * public class BackgroundValidation extends StateFragment {
 *   private class BackgroundTask extends ValidationAsyncTask {
 *     &#064;Override
 *     protected Boolean doInBackground(Object... params) {
 *       // params will always be null
 * 
 *       // do anything you'd normally do in an AsyncTask, including calls to
 *       publishProgress(&quot;progress string&quot;);
 * 
 *       return trueIfValidated;
 *     }
 *   }
 * 
 *   &#064;Override
 *   public boolean shouldValidateInBackground() {
 *     return true;
 *   }
 * 
 *   &#064;Override
 *   public ValidationAsyncTask getValidatorTask() {
 *     // make sure we're no longer allowed to go forward
 *     letUsGoForward = false;
 * 
 *     // create the task to be run
 *     int start = durationSlider.getProgress();
 *     boolean shouldPass = passCheckBox.isChecked();
 *     ValidationAsyncTask validator = new BackgroundTask(start, shouldPass);
 * 
 *     return validator;
 *   }
 * }
 * </pre>
 */
public abstract class ValidationAsyncTask extends AsyncTask<Object, String, Boolean> {

  /**
   * The callback to push events to. This must be set via {@link #setCallback(TaskCallback)} to avoid null pointer exceptions.
   */
  private TaskCallback callback;

  /**
   * Set the callback which will receive task events.
   * 
   * @param callback
   *            The callback. Cannot be null.
   */
  public void setCallback(TaskCallback callback) {
    this.callback = callback;
  }

  @Override
  protected void onPostExecute(Boolean result) {
    callback.onPostExecute(result);
  }

  @Override
  protected void onProgressUpdate(String... values) {
    callback.onProgressUpdate(values);
  }

  @Override
  protected void onCancelled() {
    callback.onCancelled();
  }

  @Override
  protected void onPreExecute() {
    callback.onPreExecute();
  }

}

Java Source Code List