TakeScreenshotCallable.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.runner.screenshot;
import android.graphics.Bitmap;
import android.support.annotation.VisibleForTesting;
import android.util.Log;
import android.view.View;
import java.lang.ref.WeakReference;
import java.util.concurrent.Callable;
/**
* Captures a {@link Bitmap} of the {@link View} hierarchy.
*
* <p>Note: This method of taking screenshots will only capture the content of the {@link View} and
* will not necessarily represent everything that is on the currently on the screen. Unfortunately,
* this is the best method to view the content of the screen for API 17 and below. For API 18 and
* above use {@link Screenshot#capture}
*/
final class TakeScreenshotCallable implements Callable<Bitmap> {
private static final String TAG = "TakeScreenshotCallable";
private WeakReference<View> viewRef;
/** Factory class to create a {@link TakeScreenshotCallable} object. */
@VisibleForTesting
static class Factory {
Callable<Bitmap> create(View view) {
return new TakeScreenshotCallable(view);
}
}
private TakeScreenshotCallable(View view) {
this.viewRef = new WeakReference<View>(view);
}
@Override
public Bitmap call() {
Bitmap bitmap = null;
viewRef.get().setDrawingCacheEnabled(true);
try {
bitmap = Bitmap.createBitmap(viewRef.get().getDrawingCache());
} catch (OutOfMemoryError omm) {
Log.e(TAG, "Out of memory exception while trying to take a screenshot.", omm);
} finally {
viewRef.get().setDrawingCacheEnabled(false);
}
return bitmap;
}
}