Android progress/status long duration toast with catchable async task loader

ProgressToast.java

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.CountDownTimer;
import android.widget.Toast;

@SuppressLint({ "ViewConstructor", "ShowToast" })
public class ProgressToast {

	public ProgressToast (Activity context, String text) {
		this.context = context;
		this.text = text;
	}
	
	public void show () {
		if (null != this.timer) {
			this.timer.cancel ();
		}
		
		context.runOnUiThread (new Runnable () {
			@Override
			public void run () {
				toast = Toast.makeText (context, text, Toast.LENGTH_LONG);
				
				timer = new CountDownTimer (30000, 1000) { // 30 seconds max
					@Override
					public void onTick (long millisUntilFinished) {
						toast.show ();
					}
					
					@Override
					public void onFinish () {
						toast.cancel ();
					}
				};

				toast.show ();
				timer.start ();
			}
		});
	}
	
	public void cancel () {
		context.runOnUiThread (new Runnable () {
			@Override
			public void run () {
				if (null != timer) {
					timer.cancel ();
					timer = null;
				}
				toast.cancel ();
			}
		});
	}
	
	public void setText (final String text) {
		context.runOnUiThread (new Runnable () {
			@Override
			public void run () {
				toast.setText (text);
			}
		});
	}
	
	private Activity context;
	private Toast toast;
	private String text;
	private CountDownTimer timer;
}

ToastProgressCatchableAsyncTaskLoader.java

import android.app.Activity;

public abstract class ToastProgressCatchableAsyncTaskLoader<D, T extends Throwable> extends CatchableAsyncTaskLoader<D, T> {

	public ToastProgressCatchableAsyncTaskLoader (Activity context, String loadingText) {
		super (context);
		this.activity = context;
		this.toast = new ProgressToast (activity, loadingText);
	}
	
	@Override
	public Catchable<D, T> loadInBackground () {
		try
		{
			toast.show ();
			return super.loadInBackground ();
		} finally {
			toast.cancel ();
		}
	}
	
	public void setToastText (String text) {
		toast.setText (text);
	}
	
	private Activity activity;
	private ProgressToast toast;
}