Espresso: How to do custom swipe e.g. swipeTop or swipeBottom

Question

So far we can do:

• swipeLeft
• swipeRight
• swipeUp
• swipeDown

How can we swipeTop(all the way to the Top) or swipeBottom(all the way to the bottom) is expresso. Please give me an example if these methods already exists.

Answer 1

Have you tried a GeneralSwipeAction like that?

private static ViewAction swipeFromTopToBottom() {
    return new GeneralSwipeAction(Swipe.FAST, GeneralLocation.TOP_CENTER,
            GeneralLocation.BOTTOM_CENTER, Press.FINGER);
}

Maybe you have to provide a custom implementation for the second and/or third parameter, as Anna already mentioned:

new CoordinatesProvider() {
    @Override
    public float[] calculateCoordinates(View view) {
        float[] coordinates =  GeneralLocation.CENTER.calculateCoordinates(view);
        coordinates[1] = 0;
        return coordinates;
    }
}

Answer 2

For example if you use recyclerView in yours application, you can use something like this:

Espresso.onView(ViewMatchers.withId(R.id.recyclerView)).perform(ViewActions.swipeUp())

or

Espresso.onView(ViewMatchers.withId(R.id.recyclerView)).perform(ViewActions.swipeDown())

Answer 3

@testsingh i think there's no out-off-box method to do the "swipeTop" or "swipeBottom" following looping maybe the easiest way (dumbest) that worked for me XDDD

//swipeUp 100 times, vice versa for swipeDown

for(int i=0;i<=100;i++){
  onView(withText("label")).perform(swipeUp());
}

Answer 4

I know I am late to the party but after quite a bit of finagling I finally found something that can swipe top to bottom, left to right, etc. - without needing any resource id's.

The reason I needed it was for a dynamically populated view where everything was completely ambiguous. With the method below I can scroll all the way to the bottom and or even change the delay to scroll down just a single page.

static void swiper(int start, int end, int delay) {
    long downTime = SystemClock.uptimeMillis();
    long eventTime = SystemClock.uptimeMillis();
    Instrumentation inst = getInstrumentation();

    MotionEvent event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_DOWN, 500, start, 0);
    inst.sendPointerSync(event);
    eventTime = SystemClock.uptimeMillis() + delay;
    event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_MOVE, 500, end, 0);
    inst.sendPointerSync(event);
    event = MotionEvent.obtain(downTime, eventTime, MotionEvent.ACTION_UP, 500, end, 0);
    inst.sendPointerSync(event);
    SystemClock.sleep(2000); //The wait is important to scroll
}

I do not need left to right, etc. so I hardcoded the 500 in there (500 being the x axis).

and to call them I did it I did this -

 // This swipes all the way to the bottom of the screen
public static void swipeToBottom(){
    swiper(1000, 100, 0);
}

// This scrolls down one page at a time
public static void scrollSlowlyDown(){
    swiper(775, 100, 100);
}

// This swipes to the top
public static void swipeToTop(){
    swiper(100, 1000, 0);
}

// This scrolls up one page at a time
public static void scrollSlowlyUp(){
    swiper(100, 775, 100);
}

I hope this helps anyone that stumbles up this.

Answer 5

I think it could be done by writing complex ViewActions by performing swipe.

public static ViewAction swipeToTop() {
    return new MySwipeAction(Swipe.FAST,
        GeneralLocation.CENTER,
        new CoordinatesProvider() {
            @Override
            public float[] calculateCoordinates(View view) {
                float[] coordinates =  GeneralLocation.CENTER.calculateCoordinates(view);
                coordinates[1] = 0;
                return coordinates;
            }
    }, Press.FINGER);
}


public static ViewAction swipeToBottom() {
    return new MySwipeAction(Swipe.FAST,
        GeneralLocation.CENTER,
        new CoordinatesProvider() {
            @Override
            public float[] calculateCoordinates(View view) {
                float[] coordinates = GeneralLocation.CENTER.calculateCoordinates(view);
                coordinates[1] = view.getContext().getResources().getDisplayMetrics().heightPixels;
                return coordinates;
            }
    }, Press.FINGER);
}

where MySwipeAction could be something like this:

public class MySwipeAction implements ViewAction {
    public MySwipeAction(Swiper swiper, CoordinatesProvider startCoordProvide, CoordinatesProvider endCoordProvide, PrecisionDescriber precDesc) { 
           // store here in class variables to use in perform
           ...
    }

    @Override public Matcher<View> getConstraints() {...}

    @Override public String getDescription() {...}

    @Override
    public void perform(UiController uiController, View view) {
        ...
        float[] startCoord = startCoordProvide.calculateCoordinates(view);
        float[] finalCoord = endCoordProvide.calculateCoordinates(view);
        float[] precision =  precDesc.describePrecision();

        Swiper.Status status = Swiper.Status.FAILURE;

        // you could try this for several times until Swiper.Status is achieved or try count is reached
        try {
            status = m_swiper.sendSwipe(uiController, startCoord, finalCoord, precision);
        } catch (RuntimeException re) {
            ...
        }

        // ensures that the swipe has been run.
        uiController.loopMainThreadForAtLeast(ViewConfiguration.getPressedStateDuration());
    }
}

I hope this could help you.

Answer 6

// swipe up
for(int i=0;i<=3;i++){
    onView(allOf(withId(R.id.recycler_view),isDisplayed())).perform(actionOnItemAtPosition(4, swipeUp()));
}


// swipe Down  
for(int i=0;i<=3;i++){
     onView(allOf(withId(R.id.recycler_view),isDisplayed())).perform(actionOnItemAtPosition(7, swipeDown()));
}