Android系统。浓咖啡：无法检查背景

时间：2018-06-11 14:30:19

标签： android-espresso

Windows 10（64位）， Android Studio 3.1.2， Gradle 4.4，Java 1.8。

这是我的布局xml 

<TextView
            android:id="@+id/loginTextView"
            android:layout_width="255dp"
            android:layout_height="60dp"
            android:layout_marginBottom="15dp"
            android:background="@drawable/sign_in_login_bg"
            android:gravity="center"                              
            app:layout_constraintBottom_toTopOf="@+id/registerTextView"
            app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />

此处 @ drawable / sign_in_login_bg 

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@color/color_primary" />
    <corners android:radius="@dimen/text_view_rounded_corner_radius" />
</shape>

我想写espresso测试，检查 loginTextView 是否有背景 @ drawable / sign_in_login_bg

所以我写自定义匹配器：

import org.hamcrest.Matcher;
      public static Matcher<View> withBackground(final int expectedResourceId) {

            return new BoundedMatcher<View, View>(View.class) {

                @Override
                public boolean matchesSafely(View view) {
                    return sameBitmap(view.getContext(), view.getBackground(), expectedResourceId);
                }

                @Override
                public void describeTo(Description description) {
                    description.appendText("has background resource " + expectedResourceId);
                }
            };
    }

此处方法 sameBitmap ：

private static boolean sameBitmap(Context context, Drawable drawable, int expectedId) {
        Drawable expectedDrawable = ContextCompat.getDrawable(context, expectedId);
        if (drawable == null || expectedDrawable == null) {
            return false;
        }
        if (drawable instanceof StateListDrawable && expectedDrawable instanceof StateListDrawable) {
            drawable = drawable.getCurrent();
            expectedDrawable = expectedDrawable.getCurrent();
        }
        if (drawable instanceof BitmapDrawable) {
            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
            Bitmap otherBitmap = ((BitmapDrawable) expectedDrawable).getBitmap();
            return bitmap.sameAs(otherBitmap);
        }
        return false;
    }

这是我的浓咖啡测试：

@Test
    public void loginTextViewBackground() {
        onView(withId(R.id.loginTextView)).check(matches(withBackground(R.drawable.sign_in_login_bg)));
}

但我得到错误：

android.support.test.espresso.base.DefaultFailureHandler$AssertionFailedWithCauseError: 'has background resource 2131230909' doesn't match the selected view.
Expected: has background resource 2131230909
Got: "AppCompatTextView{id=2131296429, res-name=loginTextView, visibility=VISIBLE, width=765, height=180, has-focus=false, has-focusable=false, has-window-focus=true, is-clickable=true, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, layout-params=android.support.constraint.ConstraintLayout$LayoutParams@bcce82, tag=null, root-is-layout-requested=false, has-input-connection=false, x=158.0, y=1283.0, text=Login, input-type=0, ime-target=false, has-links=false}"

at dalvik.system.VMStack.getThreadStackTrace(Native Method)
at java.lang.Thread.getStackTrace(Thread.java:580)
at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:90)
at android.support.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:52)
at android.support.test.espresso.ViewInteraction.waitForAndHandleInteractionResults(ViewInteraction.java:314)
at android.support.test.espresso.ViewInteraction.check(ViewInteraction.java:291)
at com.myproject.android.activity.SignInActivityTest.loginTextViewBackground(SignInActivityTest.java:158)

at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1879)
Caused by: junit.framework.AssertionFailedError: 'has background resource 2131230909' doesn't match the selected view.
Expected: has background resource 2131230909
Got: "AppCompatTextView{id=2131296429, res-name=loginTextView, visibility=VISIBLE, width=765, height=180, has-focus=false, has-focusable=false, has-window-focus=true, is-clickable=true, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, layout-params=android.support.constraint.ConstraintLayout$LayoutParams@bcce82, tag=null, root-is-layout-requested=false, has-input-connection=false, x=158.0, y=1283.0, text=Login, input-type=0, ime-target=false, has-links=false}"

at android.support.test.espresso.matcher.ViewMatchers.assertThat(ViewMatchers.java:526)

3 个答案:

答案 0 :(得分：1)

由于您的drawable是GradientDrawable，因此必须在Matcher中处理它。所以，你的匹配器可能如下所示：

private static boolean sameBitmap(Context context, Drawable drawable, int expectedId) {
    Drawable expectedDrawable = ContextCompat.getDrawable(context, expectedId);
    if (drawable == null || expectedDrawable == null) {
        return false;
    }

    if (drawable instanceof StateListDrawable && expectedDrawable instanceof StateListDrawable) {
        drawable = drawable.getCurrent();
        expectedDrawable = expectedDrawable.getCurrent();
    }
    if (drawable instanceof BitmapDrawable) {
        Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
        Bitmap otherBitmap = ((BitmapDrawable) expectedDrawable).getBitmap();
        return bitmap.sameAs(otherBitmap);
    }

    if (drawable instanceof VectorDrawable ||
            drawable instanceof VectorDrawableCompat ||
            drawable instanceof GradientDrawable) {
        Rect drawableRect = drawable.getBounds();
        Bitmap bitmap = Bitmap.createBitmap(drawableRect.width(), drawableRect.height(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);

        Bitmap otherBitmap = Bitmap.createBitmap(drawableRect.width(), drawableRect.height(), Bitmap.Config.ARGB_8888);
        Canvas otherCanvas = new Canvas(otherBitmap);
        expectedDrawable.setBounds(0, 0, otherCanvas.getWidth(), otherCanvas.getHeight());
        expectedDrawable.draw(otherCanvas);
        return bitmap.sameAs(otherBitmap);
    }
    return false;
}

答案 1 :(得分：1)

要改善Anatolii的答案，首先我们必须定义自定义匹配器：

fun withBackground(expectedResourceId: Int): Matcher<View?>? {
        return object : BoundedMatcher<View?, View>(View::class.java) {
            override fun matchesSafely(view: View): Boolean {
                return sameBitmap(view.context, view.background, expectedResourceId)
            }

            override fun describeTo(description: Description) {
                description.appendText("has background resource $expectedResourceId")
            }
        }
    }

第二，私有方法 sameBitmap 考虑所有不同的选择，并检查两个可绘制对象的类型：

private fun sameBitmap(context: Context, drawable: Drawable, resourceId: Int): Boolean {
        var drawable: Drawable? = drawable
        var expectedDrawable = ContextCompat.getDrawable(context, resourceId)
        if (drawable == null || expectedDrawable == null) {
            return false
        }

        if (drawable is StateListDrawable && expectedDrawable is StateListDrawable) {
            drawable = drawable.getCurrent()
            expectedDrawable = expectedDrawable.getCurrent()
        }
        if (drawable is BitmapDrawable) {
            val bitmap = drawable.bitmap
            val otherBitmap = (expectedDrawable as BitmapDrawable).bitmap
            return bitmap.sameAs(otherBitmap)
        }

        if ((drawable is VectorDrawable && expectedDrawable is VectorDrawable) || (drawable is VectorDrawableCompat && expectedDrawable is VectorDrawableCompat) || (drawable is GradientDrawable && expectedDrawable is GradientDrawable)) {
            return drawableToBitmap(drawable.current)!!.sameAs(drawableToBitmap(expectedDrawable.current))
        }
        return false
    }

最后是 drawableToBitmap 方法：

private fun drawableToBitmap(drawable: Drawable): Bitmap? {
        var bitmap: Bitmap? = null
        if (drawable is BitmapDrawable) {
            if (drawable.bitmap != null) {
                return drawable.bitmap
            }
        }
        bitmap = if (drawable.intrinsicWidth <= 0 || drawable.intrinsicHeight <= 0) {
            Bitmap.createBitmap(1,
                1,
                Bitmap.Config.ARGB_8888) // Single color bitmap will be created of 1x1 pixel
        } else {
            Bitmap.createBitmap(drawable.intrinsicWidth,
                drawable.intrinsicHeight,
                Bitmap.Config.ARGB_8888)
        }
        val canvas = Canvas(bitmap)
        drawable.setBounds(0, 0, canvas.width, canvas.height)
        drawable.draw(canvas)
        return bitmap
    }

这是使用它的方式：

onView(withId(R.id.on_boarding_initial_circle)).check(matches(withBackground(R.drawable.bg_gray_circle)))

答案 2 :(得分：0)

这对我有用：HasBackgroundMatcher 

onView(allOf(withId(R.id. loginTextView),
               hasBackground(R.drawable. sign_in_login_bg), isDisplayed()));
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