用 Espresso 单击 EditText 的可绘制右侧

如何才能单击 EditText 右侧可绘制对象（检查屏幕截图）？我尝试了多种方法，但总是陷入困境。

public static Matcher<View> withEditTextDrawable(final int resourceId) {
    return new BoundedMatcher<View, EditText>(EditText.class) {
        @Override
        protected boolean matchesSafely(final EditText editText) {
            // ????

            return false;
        }

        @Override
        public void describeTo(Description description) {
            description.appendText("with drawable from resource id: ");
            description.appendValue(resourceId);
        }
    };
}

Had to develop this custom action and matcher to test our discard drawables on the right of some text fields, this will click any drawable (left, top, right, bottom) of a TextView in an Espresso test.

Usage:

onView(withId(id)).perform(clickDrawables());

Method:

public static ViewAction clickDrawables()
{
    return new ViewAction()
    {
        @Override
        public Matcher<View> getConstraints()//must be a textview with drawables to do perform
        {
            return allOf(isAssignableFrom(TextView.class), new BoundedMatcher<View, TextView>(TextView.class)
            {
                @Override
                protected boolean matchesSafely(final TextView tv)
                {
                    if(tv.requestFocusFromTouch())//get fpocus so drawables become visible
                        for(Drawable d : tv.getCompoundDrawables())//if the textview has drawables then return a match
                            if(d != null)
                                return true;

                    return false;
                }

                @Override
                public void describeTo(Description description)
                {
                    description.appendText("has drawable");
                }
            });
        }

        @Override
        public String getDescription()
        {
            return "click drawables";
        }

        @Override
        public void perform(final UiController uiController, final View view)
        {
            TextView tv = (TextView)view;
            if(tv != null && tv.requestFocusFromTouch())//get focus so drawables are visible
            {
                Drawable[] drawables = tv.getCompoundDrawables();

                Rect tvLocation = new Rect();
                tv.getHitRect(tvLocation);

                Point[] tvBounds = new Point[4];//find textview bound locations
                tvBounds[0] = new Point(tvLocation.left, tvLocation.centerY());
                tvBounds[1] = new Point(tvLocation.centerX(), tvLocation.top);
                tvBounds[2] = new Point(tvLocation.right, tvLocation.centerY());
                tvBounds[3] = new Point(tvLocation.centerX(), tvLocation.bottom);

                for(int location = 0; location < 4; location++)
                    if(drawables[location] != null)
                    {
                        Rect bounds = drawables[location].getBounds();
                        tvBounds[location].offset(bounds.width() / 2, bounds.height() / 2);//get drawable click location for left, top, right, bottom
                        if(tv.dispatchTouchEvent(MotionEvent.obtain(android.os.SystemClock.uptimeMillis(), android.os.SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, tvBounds[location].x, tvBounds[location].y, 0)))
                            tv.dispatchTouchEvent(MotionEvent.obtain(android.os.SystemClock.uptimeMillis(), android.os.SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, tvBounds[location].x, tvBounds[location].y, 0));
                    }
            }
        }
    };
}

这是我为了选择要单击的特定绘图而进行的改进：

Usage:

onView(withId(id)).perform(new ClickDrawableAction(ClickDrawableAction.Right));

Method:

public static class ClickDrawableAction implements ViewAction
{
    public static final int Left = 0;
    public static final int Top = 1;
    public static final int Right = 2;
    public static final int Bottom = 3;

    @Location
    private final int drawableLocation;

    public ClickDrawableAction(@Location int drawableLocation)
    {
        this.drawableLocation = drawableLocation;
    }

    @Override
    public Matcher<View> getConstraints()
    {
        return allOf(isAssignableFrom(TextView.class), new BoundedMatcher<View, TextView>(TextView.class)
        {
            @Override
            protected boolean matchesSafely(final TextView tv)
            {
                //get focus so drawables are visible and if the textview has a drawable in the position then return a match
                return tv.requestFocusFromTouch() && tv.getCompoundDrawables()[drawableLocation] != null;

            }

            @Override
            public void describeTo(Description description)
            {
                description.appendText("has drawable");
            }
        });
    }

    @Override
    public String getDescription()
    {
        return "click drawable ";
    }

    @Override
    public void perform(final UiController uiController, final View view)
    {
        TextView tv = (TextView)view;//we matched
        if(tv != null && tv.requestFocusFromTouch())//get focus so drawables are visible
        {
            //get the bounds of the drawable image
            Rect drawableBounds = tv.getCompoundDrawables()[drawableLocation].getBounds();

            //calculate the drawable click location for left, top, right, bottom
            final Point[] clickPoint = new Point[4];
            clickPoint[Left] = new Point(tv.getLeft() + (drawableBounds.width() / 2), (int)(tv.getPivotY() + (drawableBounds.height() / 2)));
            clickPoint[Top] = new Point((int)(tv.getPivotX() + (drawableBounds.width() / 2)), tv.getTop() + (drawableBounds.height() / 2));
            clickPoint[Right] = new Point(tv.getRight() + (drawableBounds.width() / 2), (int)(tv.getPivotY() + (drawableBounds.height() / 2)));
            clickPoint[Bottom] = new Point((int)(tv.getPivotX() + (drawableBounds.width() / 2)), tv.getBottom() + (drawableBounds.height() / 2));

            if(tv.dispatchTouchEvent(MotionEvent.obtain(android.os.SystemClock.uptimeMillis(), android.os.SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, clickPoint[drawableLocation].x, clickPoint[drawableLocation].y, 0)))
                tv.dispatchTouchEvent(MotionEvent.obtain(android.os.SystemClock.uptimeMillis(), android.os.SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, clickPoint[drawableLocation].x, clickPoint[drawableLocation].y, 0));
        }
    }

    @IntDef({ Left, Top, Right, Bottom })
    @Retention(RetentionPolicy.SOURCE)
    public @interface Location{}
}