匹配listview行Espresso的背景色 [英] Match background color of listview row Espresso
问题描述
我有一个ListView,其中包含通过自定义适配器创建的不同颜色的行,例如:
I have a ListView with rows of different colors created through a custom adapter like:
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
convertView = mInflater.inflate(R.layout.row_unit, parent, false);
// ...
if( /* some condition */ ) {
convertView.setBackgroundColor(Color.LTGRAY);
} else {
convertView.setBackgroundColor(Color.WHITE);
}
return convertView;
}
在一个测试中,我想检查列表中的某个元素是否具有Color LTGRAY.我创建了一个自定义匹配器:
In a test, I would like to check whether a certain element in the list has Color LTGRAY. I created a custom matcher:
public static Matcher<Object> backgroundShouldHaveColor(int expectedColor) {
return viewShouldHaveBackgroundColor(equalTo(expectedColor));
}
private static Matcher<Object> viewShouldHaveBackgroundColor(final Matcher<Integer> expectedObject) {
final int[] color = new int[1];
return new BoundedMatcher<Object, View>( View.class) {
@Override
public boolean matchesSafely(View view) {
color[0] =((ColorDrawable) view.getBackground()).getColor();
if( expectedObject.matches(color[0])) {
return true;
} else {
return false;
}
}
@Override
public void describeTo(final Description description) {
// Should be improved!
description.appendText("Color did not match " + color[0]);
}
};
}
尝试进行测试
onView(withText("itemtext")).check(matches(backgroundShouldHaveColor(Color.LTGRAY)));
我得到一个空指针异常.
I get a null pointer exception.
推荐答案
以下内容似乎对我有用:
The following seems to work for me:
onView(withChild(withText("itemtext"))) // this matches the LinearLayout or row/convertview
.check(matches(withBgColor(Color.LTGRAY)));
自定义匹配项位于:
public static Matcher<View> withBgColor(final int color) {
Checks.checkNotNull(color);
return new BoundedMatcher<View, LinearLayout>(LinearLayout.class) {
@Override
public boolean matchesSafely(LinearLayout row) {
return color == ((ColorDrawable) row.getBackground()).getColor();
}
@Override
public void describeTo(Description description) {
description.appendText("with text color: ");
}
};
}
这是一个三列列表视图,其中每行包含一个带有3个子TextViews的LinearLayout. "withText(" itemtext)"与第一列中的元素/TextView匹配.此列中的元素是唯一的.
This is for a three column listview where each row consists of a LinearLayout with 3 child TextViews. "withText("itemtext")" matches an element/TextView in the first column. Elements in this column are unique.
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