AsyncTask base broilerplate NB! override OnDestroy in activity in order to avoid leaked window exceptions

Activity.java

@Override
protected void onDestroy() {

	if (mAsyncTask != null && mAsyncTask.getDialog() != null
		&& mAsyncTask.getDialog().isShowing())
		mAsyncTask.getDialog().dismiss();

	super.onDestroy();
}

BaseAsyncTask.java

package com.modera.taxofondriver.base;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.os.AsyncTask;

public abstract class BaseAsyncTask<T1, T2, T3> extends AsyncTask<T1, T2, T3> {

  private ProgressDialog mDialog;
	private String mDialogTitle;
	private String mDialogMessage;

	private Activity a;

	@Override
	protected void onPreExecute() {

		if (a == null)
			throw new RuntimeException("BaseAsynctask Activity is null");

		mDialog = ProgressDialog.show(a, mDialogTitle, mDialogMessage, true,
				true, new OnCancelListener() {

					@Override
					public void onCancel(DialogInterface dialog) {
						cancel(true);
					}
				});

	}

	protected void onPostExecute(T3 result) {
		if (a != null)
			mDialog.dismiss();
	}

	// getters and setters
	public void setDialogTitle(String mDialogTitle) {
		this.mDialogTitle = mDialogTitle;
	}

	public String getDialogTitle() {
		return mDialogTitle;
	}

	public void setDialogMessage(String mDialogMessage) {
		this.mDialogMessage = mDialogMessage;
	}

	public String getDialogMessage() {
		return mDialogMessage;
	}

	public void setActivity(Activity a) {
		this.a = a;
	}

	public Activity getActivity() {
		return a;
	}

	public ProgressDialog getDialog() {
		return mDialog;
	};

}