HasBackgroundMatcher.java
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.test.espresso.matcher;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.Log;
import android.view.View;
import androidx.test.annotation.Beta;
import java.util.Arrays;
import org.hamcrest.Description;
import org.hamcrest.TypeSafeMatcher;
/**
* Matcher to match {@link android.view.View} based on its background resource.
*
* <p><b>This API is currently in beta.</b>
*/
@Beta
public final class HasBackgroundMatcher extends TypeSafeMatcher<View> {
private static final String TAG = "HasBackgroundMatcher";
private final int drawableId;
public HasBackgroundMatcher(int drawableId) {
this.drawableId = drawableId;
}
@Override
protected boolean matchesSafely(View view) {
return assertDrawable(view.getBackground(), drawableId, view);
}
@Override
public void describeTo(Description description) {
description.appendText("has background with drawable ID: " + drawableId);
}
static boolean compareBitmaps(Bitmap img1, Bitmap img2) {
if (img1.getWidth() == img2.getWidth() && img1.getHeight() == img2.getHeight()) {
int[] img1Pixels = new int[img1.getWidth() * img1.getHeight()];
int[] img2Pixels = new int[img2.getWidth() * img2.getHeight()];
img1.getPixels(img1Pixels, 0, img1.getWidth(), 0, 0, img1.getWidth(), img1.getHeight());
img2.getPixels(img2Pixels, 0, img2.getWidth(), 0, 0, img2.getWidth(), img2.getHeight());
return Arrays.equals(img1Pixels, img2Pixels);
}
return false;
}
private static boolean assertDrawable(Drawable actual, int expectedId, View v) {
if (null == actual || !(actual instanceof BitmapDrawable)) {
return false;
}
Bitmap expectedBitmap = null;
try {
expectedBitmap = BitmapFactory.decodeResource(v.getContext().getResources(), expectedId);
if (Build.VERSION.SDK_INT >= 12) {
return ((BitmapDrawable) actual).getBitmap().sameAs(expectedBitmap);
} else {
return compareBitmaps(((BitmapDrawable) actual).getBitmap(), expectedBitmap);
}
} catch (OutOfMemoryError error) {
Log.e(TAG, error.getMessage(), error.getCause());
return false;
} finally {
if (expectedBitmap != null) {
expectedBitmap.recycle();
expectedBitmap = null;
}
}
}
}