Well, I think I have found the final solution for you. Due to AppCompat and friends, the popped code is sometimes inflated in different forms, so getResources().getBitmap(R.drawable.my_awesome_drawable) not enough.
So, to get an approximate instance of the same type and form as the view, you can do the following:
public static Drawable drawableFrom(View view, @DrawableRes int drawableId) { Context context = view.getContext(); try { View dummyView = view.getClass().getConstructor(Context.class).newInstance(context); dummyView.setBackgroundResource(drawableId); return dummyView.getBackground(); } catch (Exception e) { return ResourcesCompat.getDrawable(context.getResources(), drawableId, null); } }
This is useful when running tests. However, I would not recommend doing this in production. If you need additional caching, it would be advisable to avoid too much reflection.
For express tests, you can use this pretty well:
onView(withDrawable(R.drawable.awesome_drawable)) .check(matches(isDisplayed()));
or
onView(withId(R.id.view_id)) .check(matches(withDrawable(R.drawable.awesome_drawable)));
Before you have to declare this helper class:
public class CustomMatchers { public static Matcher<View> withDrawable(@DrawableRes final int drawableId) { return new DrawableViewMatcher(drawableId); } private static class DrawableViewMatcher extends TypeSafeMatcher<View> { private final int expectedId; private String resourceName; private enum DrawableExtractionPolicy { IMAGE_VIEW { @Override Drawable findDrawable(View view) { return view instanceof ImageView ? ((ImageView) view).getDrawable() : null; } }, TEXT_VIEW_COMPOUND { @Override Drawable findDrawable(View view) { return view instanceof TextView ? findFirstCompoundDrawable((TextView) view) : null; } }, BACKGROUND { @Override Drawable findDrawable(View view) { return view.getBackground(); } }; @Nullable private static Drawable findFirstCompoundDrawable(TextView view) { for (Drawable drawable : view.getCompoundDrawables()) { if (drawable != null) { return drawable; } } return null; } abstract Drawable findDrawable(View view); } private DrawableViewMatcher(@DrawableRes int expectedId) { this.expectedId = expectedId; } @Override protected boolean matchesSafely(View view) { resourceName = resources(view).getResourceName(expectedId); return haveSameState(actualDrawable(view), expectedDrawable(view)); } private boolean haveSameState(Drawable actual, Drawable expected) { return actual != null && expected != null && areEqual(expected.getConstantState(), actual.getConstantState()); } private Drawable actualDrawable(View view) { for (DrawableExtractionPolicy policy : DrawableExtractionPolicy.values()) { Drawable drawable = policy.findDrawable(view); if (drawable != null) { return drawable; } } return null; } private boolean areEqual(Object first, Object second) { return first == null ? second == null : first.equals(second); } private Drawable expectedDrawable(View view) { return drawableFrom(view, expectedId); } private static Drawable drawableFrom(View view, @DrawableRes int drawableId) { Context context = view.getContext(); try { View dummyView = view.getClass().getConstructor(Context.class).newInstance(context); dummyView.setBackgroundResource(drawableId); return dummyView.getBackground(); } catch (Exception e) { return ResourcesCompat.getDrawable(context.getResources(), drawableId, null); } } @NonNull private Resources resources(View view) { return view.getContext().getResources(); } @Override public void describeTo(Description description) { description.appendText("with drawable from resource id: "); description.appendValue(expectedId); if (resourceName != null) { description.appendValueList("[", "", "]", resourceName); } } } }