How to make slide to unlock button in android

First of all I'd like to thank @matthias for his answer. I have used the following seek bar with some customization:

 <SeekBar
        android:id="@+id/myseek"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:clickable="false"
        android:max="100"
        android:progressDrawable="@android:color/transparent"
        android:thumb="@drawable/ic_launcher" />

and in java code

sb.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

            if (seekBar.getProgress() > 95) {

            } else {

                seekBar.setThumb(getResources().getDrawable(R.drawable.ic_launcher));
            }

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {


        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            if(progress>95){
                seekBar.setThumb(getResources().getDrawable(R.drawable.load_img1));
            }

        }
    });

I started out with the example that Jignesh Ansodariya posted, but as Aerrow points out, the user can click anywhere on the SeekBar to unlock. That makes it quite unusable, since the point with having a slide button is that accidental clicks should be ignored. My solution was to create a subclass of SeekBar, like this:

public class SlideButton extends SeekBar {

    private Drawable thumb;
    private SlideButtonListener listener;

    public SlideButton(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setThumb(Drawable thumb) {
        super.setThumb(thumb);
        this.thumb = thumb;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            if (thumb.getBounds().contains((int) event.getX(), (int) event.getY())) {
                super.onTouchEvent(event);
            } else
                return false;
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            if (getProgress() > 70)
                handleSlide();

            setProgress(0);
        } else
            super.onTouchEvent(event);

        return true;
    }

    private void handleSlide() {
        listener.handleSlide();
    }

    public void setSlideButtonListener(SlideButtonListener listener) {
        this.listener = listener;
    }   
}

public interface SlideButtonListener {
    public void handleSlide();
}

XML:

        <package.SlideButton
            android:id="@+id/unlockButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clickable="false"
            android:max="100"
            android:progressDrawable="@android:color/transparent"
            android:thumb="@drawable/button_lock" >
        </package.SlideButton>

And finally the code inside my Activity:

    ((SlideButton) findViewById(R.id.unlockButton)).setSlideButtonListener(new SlideButtonListener() {  
        @Override
        public void handleSlide() {
            unlockScreen();
        }
    });