DelayedProgressDialog.java

DelayedProgressDialog.java

/**
 * 
 */
package com.appiarium.example;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.Handler;

/**
 * @author Hans Dulimarta
 *
 * hans.dulimarta@gmail.com, dulimarh@cis.gvsu.edu
 *
 */
public class DelayedProgressDialog extends ProgressDialog {
    private static Handler dialogHandler;
    private Runnable runner;
	
    static {
        dialogHandler = new Handler();
    }
	
    public DelayedProgressDialog(Context context) {
        super(context);
    }

    public static ProgressDialog show (Context c, CharSequence title, CharSequence msg, long afterDelayMilliSec)
    {
        final DelayedProgressDialog pd = new DelayedProgressDialog(c);
        pd.setTitle(title);
        pd.setMessage(msg);
        pd.setCancelable(true);
        pd.runner = new Runnable() {
			
            public void run() {
                try {
                    pd.show();
                }
                catch (Exception e) {
                    /* do nothing */
                }
            }
        };
        dialogHandler.postDelayed(pd.runner, afterDelayMilliSec);
        return pd;
    }

    @Override
    public void cancel() {
        dialogHandler.removeCallbacks(runner);
        super.cancel();
    }
}

SampleTask.java

package com.appiarium.example;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.widget.Toast;

/**
 * Created by Hans Dulimarta 
 * hans.dulimarta@gmail.com, dulimarh@cis.gvsu.edu
 */
public class SampleTask extends AsyncTask<Long,Void,Void> {

    private long dialogDelay;
    private ProgressDialog progress;
    private Context myContext;

    public SampleTask(Context c, long d)
    {
        myContext = c;
        dialogDelay = d;
    }

    @Override
    protected void onPreExecute() {
        progress = DelayedProgressDialog.show(myContext, "Sample", "Hello", dialogDelay);

        // Compare that to the following:
        // progress = ProgressDialog.show(myContext, "Sample", "Hello");
    }

    @Override
    protected Void doInBackground(Long... params) {
        /* The actual work will replace the following try-catch */
        try {
            Thread.sleep(params[0]);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        if (progress.isShowing())
            progress.dismiss();
        progress.cancel();  /* important to invoke cancel() */
        Toast.makeText(myContext, "Task completed", Toast.LENGTH_SHORT).show();
    }
}