Espresso extra view matchers

gistfile1.txt

public class ExtraViewMatchers {


    public static Matcher<? super View> hasSelectedTab(final String tabName) {
        return new BoundedMatcher<View, TabLayout>(TabLayout.class) {
            public void describeTo(Description description) {
                description.appendText("has selected tab " + tabName);
            }

            public boolean matchesSafely(TabLayout tabLayout) {
                TabLayout.Tab tab = tabLayout.getTabAt(tabLayout.getSelectedTabPosition());
                return tabName.equals(tab.getText().toString());
            }
        };
    }

    public static Matcher<View> hasTabAtIndex(final int index, final String tabName) {
        return new BoundedMatcher<View, TabLayout>(TabLayout.class) {
            public void describeTo(Description description) {
                description.appendText("has tab " + tabName + " at index " + index);
            }

            public boolean matchesSafely(TabLayout tabLayout) {
                TabLayout.Tab tab = tabLayout.getTabAt(index);
                return tabName.equals(tab.getText().toString());
            }
        };
    }

    public static Matcher<View> withImage(@DrawableRes final int imageResource) {
        return new BoundedMatcher<View, ImageView>(ImageView.class) {
            public void describeTo(Description description) {
                description.appendText("with image: " + imageResource);
            }

            public boolean matchesSafely(ImageView imageView) {
                Bitmap expectedBitmap = BitmapFactory
                        .decodeResource(InstrumentationRegistry.getContext().getResources(), imageResource);
                if (expectedBitmap == null) {
                    expectedBitmap = BitmapFactory
                            .decodeResource(InstrumentationRegistry.getTargetContext().getResources(), imageResource);
                }
                Bitmap actualBitmap = ((BitmapDrawable) imageView.getDrawable().getCurrent()).getBitmap();
                //essentially compare the middle pixel
                int expectedPixel = expectedBitmap.getPixel(expectedBitmap.getWidth() / 2, expectedBitmap.getHeight() / 2);
                int actualPixel = actualBitmap.getPixel(actualBitmap.getWidth() / 2, actualBitmap.getHeight() / 2);
                return expectedPixel == actualPixel;
            }
        };
    }

    public static Matcher<View> hasScrollbar() {
        return new BoundedMatcher<View, AbsListView>(AbsListView.class) {
            public void describeTo(Description description) {
                description.appendText("with scrollbar");
            }

            public boolean matchesSafely(AbsListView listView) {
                return listView.getScrollBarSize() > 0;
            }
        };
    }

    public static Matcher<View> isEllipsized() {
        return new BoundedMatcher<View, TextView>(TextView.class) {
            public void describeTo(Description description) {
                description.appendText("with ellipsize");
            }

            public boolean matchesSafely(TextView textView) {
                Layout l = textView.getLayout();
                if (l != null) {
                    int lines = l.getLineCount();
                    if (lines > 0) {
                        if (l.getEllipsisCount(lines - 1) > 0) {
                            return true;
                        }
                    }
                }
                return false;
            }
        };
    }

    /***
     * The snackbar will try and wrap lines to make them look pretty, for example, if you have the text: "I like Monkeys. I also like cats."
     * and it works out the text is too long to fit on a single line, it will produce: "I like Monkeys.\nI also like cats." which means
     * when using withText() as a matcher, it won't actually match
     *
     * @param message the text without linebreaks you want to match on a snackbar message
     */
    public static Matcher<View> hasSnackbarMessage(final String message) {
        return new BoundedMatcher<View, AppCompatTextView>(AppCompatTextView.class) {

            @Override
            public void describeTo(final Description description) {
                description.appendText("with snackbar");
            }

            @Override
            protected boolean matchesSafely(final AppCompatTextView item) {
                String value = item.getText().toString();
                value = value.replaceAll("\n", " ");
                return value.equals(message);
            }
        };
    }

}