Stop the AsyncTask

<?xml version="1.0" encoding="utf-8"?>
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="hello" />

<Button
    android:id="@+id/btnStartCounter"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Start"
    android:onClick="startCounter" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="TextView" />

</LinearLayout>

package com.java2s.myapplication4.app;
/* ww w.j  a v  a 2 s. c  o  m*/
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {
    static TextView txtView1;

    DoCountingTask task;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        txtView1 = (TextView) findViewById(R.id.textView1);
    }

    public void startCounter(View view) {
        task = (DoCountingTask) new DoCountingTask().execute();
    }

    public void stopCounter(View view) {
        task.cancel(true);
    }

    private class DoCountingTask extends AsyncTask<Void, Integer, Void> {
        protected Void doInBackground(Void... params) {
            for (int i = 0; i < 1000; i++) {
                publishProgress(i);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    Log.d ("Threading", e.getLocalizedMessage());
                }
                if (isCancelled()) break;
            }
            return null;
        }

        protected void onProgressUpdate(Integer... progress) {
            txtView1.setText(progress[0].toString());
            Log.d ("Threading", "updating...");
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        stopCounter(txtView1);
    }


}