ProgressTask.java

/**
 ** Copyright (c) 2010 Ushahidi Inc
 ** All rights reserved
 ** Contact: team@ushahidi.com
 ** Website: http://www.ushahidi.com
 **
 ** GNU Lesser General Public License Usage
 ** This file may be used under the terms of the GNU Lesser
 ** General Public License version 3 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file. Please review the following information to
 ** ensure the GNU Lesser General Public License version 3 requirements
 ** will be met: http://www.gnu.org/licenses/lgpl.html.
 **
 **
 ** If you have questions regarding the use of this file, please contact
 ** Ushahidi developers at team@ushahidi.com.
 **
 **/

package com.ushahidi.android.app.tasks;

import android.app.Activity;
import android.app.ProgressDialog;

import com.ushahidi.android.app.R;

/**
 * ProgressTask Parent class for all AsyncTasks that need to show ProgressDialog
 * while executing
 */
public abstract class ProgressTask extends Task<String, String, Boolean> {

	protected final ProgressDialog dialog;

	protected ProgressCallback callback;

	protected ProgressTask(Activity activity) {
		this(activity, R.string.loading_);
	}

	protected ProgressTask(Activity activity, int message) {
		super(activity);
		this.dialog = new ProgressDialog(activity);
		this.dialog.setCancelable(true);
		this.dialog.setIndeterminate(true);
		this.dialog.setMessage(activity.getString(message));
	}
	
	public void register(ProgressCallback callback) {
		this.callback = callback;
	}

	@Override
	protected void onPreExecute() {
		super.onPreExecute();
		dialog.show();
	}

	@Override
	protected void onProgressUpdate(String... values) {
		super.onProgressUpdate(values);
		if (values != null && values.length > 0) {
			dialog.setMessage(values[0]);
		}
		if (!dialog.isShowing()) {
			dialog.show();
		}
	}

	@Override
	protected void onPostExecute(Boolean success) {
		super.onPostExecute(success);
		dialog.dismiss();
		if (callback != null) {
			callback.execute();
		}
	}
}