我正在尝试编写一个测试来检查我的ViewGroup是否具有正确的背景。我正在使用Espresso和Hamcrest进行测试。
这是我用于ViewGroup（RelativeLayout）背景的xml文件。
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape android:shape="rectangle">
<corners android:radius="4dp" />
<solid android:color="@color/gray" />
</shape>
</item>
<item>
<shape android:shape="rectangle">
<corners android:radius="4dp" />
<solid android:color="@color/white" />
<stroke
android:width="1dp"
android:color="@color/colorPrimaryDark" />
</shape>
</item>
</selector>
尝试1
我跟踪了programcreek.com中的代码，并在GradientDrawable和getCurrent上调用expectedDrawable后得到actualDrawable。由于示例中未涵盖GradientDrawable，因此我尝试添加一些代码，希望它可以正常工作。
public static Matcher<View> withBgDrawable(final int expectedResourceId) {
return new TypeSafeMatcher<View>() {
@Override
public boolean matchesSafely(View view) {
Drawable actualDrawable = view.getBackground();
if (expectedResourceId < 0) return actualDrawable == null;
Drawable expectedDrawable = ContextCompat.getDrawable(view.getContext(), expectedResourceId);
if (expectedDrawable == null) return false;
if (actualDrawable instanceof StateListDrawable) {
actualDrawable = actualDrawable.getCurrent();
}
if (expectedDrawable instanceof StateListDrawable) {
expectedDrawable = expectedDrawable.getCurrent();
}
if (expectedDrawable instanceof GradientDrawable) {
return actualDrawable instanceof GradientDrawable && gradientToBitmap((GradientDrawable) expectedDrawable)
.sameAs(gradientToBitmap((GradientDrawable) actualDrawable));
}
throw new IllegalArgumentException("Unsupported drawable: " + actualDrawable);
}
@Override
public void describeTo(Description description) {
description.appendText("with drawable ");
}
};
}
private static Bitmap gradientToBitmap(GradientDrawable gradientDrawable) {
Bitmap bitmap = Bitmap.createBitmap(gradientDrawable.getIntrinsicWidth(), gradientDrawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
gradientDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
gradientDrawable.draw(canvas);
return bitmap;
}
这是我得到的错误。
java.lang.IllegalArgumentException：width和height必须是＆gt; 0
所以，我记录了gradientDrawable.getIntrinsicWidth()的值，看看发生了什么，发现它是-1。
尝试2
然后，我尝试将StateListDrawable（s）直接更改为Bitmap（s）。我得到了与尝试1相同的错误。
public static Matcher<View> withBgDrawable(final int expectedResourceId) {
return new TypeSafeMatcher<View>() {
@Override
public boolean matchesSafely(View view) {
Drawable actualDrawable = view.getBackground();
if (expectedResourceId < 0) return actualDrawable == null;
Drawable expectedDrawable = ContextCompat.getDrawable(view.getContext(), expectedResourceId);
if (expectedDrawable == null) return false;
if (expectedDrawable instanceof StateListDrawable) {
return actualDrawable instanceof StateListDrawable && stateListToBitmap((StateListDrawable) expectedDrawable)
.sameAs(stateListToBitmap((StateListDrawable) actualDrawable));
}
throw new IllegalArgumentException("Unsupported drawable: " + actualDrawable);
}
@Override
public void describeTo(Description description) {
description.appendText("with drawable ");
}
};
}
private static Bitmap stateListToBitmap(StateListDrawable stateListDrawable) {
Bitmap bitmap = Bitmap.createBitmap(stateListDrawable.getIntrinsicWidth(), stateListDrawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
stateListDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
stateListDrawable.draw(canvas);
return bitmap;
}
尝试3
如果我在equals或==上使用StateListDrawable或GradientDrawable，则同一xml文件中的drawable不匹配。
android.support.test.espresso.base.DefaultFailureHandler $ AssertionFailedWithCauseError： ＆＃39; with drawable＆＃39;与所选视图不匹配。