Espresso - Set SeekBar

Issue

does anybody know, how to set a seekBar to a specific value or just a click on that view on Espresso UI Testing ?

I just get an exception: Error performing 'single click' on view with id...

onView(withId(R.id.FilterPriceMax)).perform(click());

Solution

I use a swipe-action to perform an actual swipe on the SeekBar. This makes sure the callback method (SeekBar.OnSeekBarChangeListener. onProgressChanged) is called with fromUser set to true. It is also more in the line of click testing.

public static ViewAction scrubSeekBarAction(int progress) {
    return actionWithAssertions(new GeneralSwipeAction(
            Swipe.SLOW,
            new SeekBarThumbCoordinatesProvider(0),
            new SeekBarThumbCoordinatesProvider(progress),
            Press.PINPOINT));
}

private static class SeekBarThumbCoordinatesProvider implements CoordinatesProvider {
    int mProgress;

    public SeekBarThumbCoordinatesProvider(int progress) {
        mProgress = progress;
    }

    private static float[] getVisibleLeftTop(View view) {
        final int[] xy = new int[2];
        view.getLocationOnScreen(xy);
        return new float[]{ (float) xy[0], (float) xy[1] };
    }

    @Override
    public float[] calculateCoordinates(View view) {
        if (!(view instanceof SeekBar)) {
            throw new PerformException.Builder()
                    .withViewDescription(HumanReadables.describe(view))
                    .withCause(new RuntimeException(String.format("SeekBar expected"))).build();
        }
        SeekBar seekBar = (SeekBar) view;
        int width = seekBar.getWidth() - seekBar.getPaddingLeft() - seekBar.getPaddingRight();
        double progress = mProgress == 0 ? seekBar.getProgress() : mProgress;
        int xPosition = (int) (seekBar.getPaddingLeft() + width * progress / seekBar.getMax());
        float[] xy = getVisibleLeftTop(seekBar);
        return new float[]{ xy[0] + xPosition, xy[1] + 10 };
    }
}

Answered By - Jakob C