This document contains sample Java code for implementing an asynchronous task object for use in an Android project. The code defines an AsyncTaskSample class that extends the AsyncTask class and overrides the doInBackground and onPostExecute methods to perform background tasks and update the UI respectively. The code is provided under a MIT license and may be distributed by LinkedIn on the author's profile with other distribution requiring approval.

1. /*********************************************************************************************
*
* AsyncTaskSample.java
*
* Sample Java Code
*
* This file shows an implementation of an Asynchronous Task Object for use in an
* Android project. It does not perform any specific tasks.
*
* This sample code is Copyright by Matt Kutschera, 2017
*
* It may viewed by anyone, and may be distributed by LinkedIn only on my personal
* LinkedIn profile. Any other method of distribution is available only by approval on
* a case by case basis.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**********************************************************************************************/
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import android.widget.TextView;
import java.util.LinkedList;
public class AsyncTaskSample extends AsyncTask<String, Void, Integer> {
protected LinkedList<String> strings;
private TextView outputTextView;
/**
* AsyncTaskSample()
*
* Initializes the strings LinkedList
*
* @param textView textView object to write results to
*/
public AsyncTaskSample(@NonNull TextView textView)
{
strings = new LinkedList<String>();
outputTextView = textView;
}
/**
* doInBackground()
*
* Performs some time-consuming task in the background. As this is simply a sample,
* it artificially takes up some time using the wait() function.
*
* @param params at least one string to write to the textView object
* @return number of strings to write to textView
*/
@Override
protected Integer doInBackground(String... params)
{
int i;
for (i = 0; i < params.length; i++)
{
strings.add(params[i]);
try
{
wait(100);
} catch (InterruptedException e) {

2. e.printStackTrace();
}
}
return params.length;
}
/**
*
* onPostExecute()
*
* Writes the result of the task to the TextView object.
*
* @param result number of strings to write to textView
*/
@Override
protected void onPostExecute(Integer result)
{
super.onPostExecute(result);
String header = result.toString() + " strings.n";
outputTextView.setText(header);
for (String string: strings)
{
outputTextView.append(string + "n");
}
}
}