| /* |
| * Copyright (C) 2014 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 android.app; |
| |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.graphics.Bitmap; |
| import android.graphics.ColorSpace; |
| import android.graphics.Matrix; |
| import android.graphics.RectF; |
| import android.graphics.drawable.BitmapDrawable; |
| import android.graphics.drawable.Drawable; |
| import android.hardware.HardwareBuffer; |
| import android.os.Bundle; |
| import android.os.Parcelable; |
| import android.transition.TransitionUtils; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.ImageView; |
| import android.widget.ImageView.ScaleType; |
| |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Listener provided in |
| * {@link Activity#setEnterSharedElementCallback(SharedElementCallback)} and |
| * {@link Activity#setExitSharedElementCallback(SharedElementCallback)} as well as |
| * {@link Fragment#setEnterSharedElementCallback(SharedElementCallback)} and |
| * {@link Fragment#setExitSharedElementCallback(SharedElementCallback)} |
| * to monitor the Shared element transitions. The events can be used to customize Activity |
| * and Fragment Transition behavior. |
| */ |
| public abstract class SharedElementCallback { |
| private Matrix mTempMatrix; |
| private static final String BUNDLE_SNAPSHOT_BITMAP = "sharedElement:snapshot:bitmap"; |
| private static final String BUNDLE_SNAPSHOT_HARDWARE_BUFFER = |
| "sharedElement:snapshot:hardwareBuffer"; |
| private static final String BUNDLE_SNAPSHOT_COLOR_SPACE = "sharedElement:snapshot:colorSpace"; |
| private static final String BUNDLE_SNAPSHOT_IMAGE_SCALETYPE = "sharedElement:snapshot:imageScaleType"; |
| private static final String BUNDLE_SNAPSHOT_IMAGE_MATRIX = "sharedElement:snapshot:imageMatrix"; |
| |
| static final SharedElementCallback NULL_CALLBACK = new SharedElementCallback() { |
| }; |
| |
| /** |
| * In Activity Transitions, onSharedElementStart is called immediately before |
| * capturing the start of the shared element state on enter and reenter transitions and |
| * immediately before capturing the end of the shared element state for exit and return |
| * transitions. |
| * <p> |
| * In Fragment Transitions, onSharedElementStart is called immediately before capturing the |
| * start state of all shared element transitions. |
| * <p> |
| * This call can be used to adjust the transition start state by modifying the shared |
| * element Views. Note that no layout step will be executed between onSharedElementStart |
| * and the transition state capture. |
| * <p> |
| * For Activity Transitions, any changes made in {@link #onSharedElementEnd(List, List, List)} |
| * that are not updated during by layout should be corrected in onSharedElementStart for exit and |
| * return transitions. For example, rotation or scale will not be affected by layout and |
| * if changed in {@link #onSharedElementEnd(List, List, List)}, it will also have to be reset |
| * in onSharedElementStart again to correct the end state. |
| * |
| * @param sharedElementNames The names of the shared elements that were accepted into |
| * the View hierarchy. |
| * @param sharedElements The shared elements that are part of the View hierarchy. |
| * @param sharedElementSnapshots The Views containing snap shots of the shared element |
| * from the launching Window. These elements will not |
| * be part of the scene, but will be positioned relative |
| * to the Window decor View. This list is null for Fragment |
| * Transitions. |
| */ |
| public void onSharedElementStart(List<String> sharedElementNames, |
| List<View> sharedElements, List<View> sharedElementSnapshots) {} |
| |
| /** |
| * In Activity Transitions, onSharedElementEnd is called immediately before |
| * capturing the end of the shared element state on enter and reenter transitions and |
| * immediately before capturing the start of the shared element state for exit and return |
| * transitions. |
| * <p> |
| * In Fragment Transitions, onSharedElementEnd is called immediately before capturing the |
| * end state of all shared element transitions. |
| * <p> |
| * This call can be used to adjust the transition end state by modifying the shared |
| * element Views. Note that no layout step will be executed between onSharedElementEnd |
| * and the transition state capture. |
| * <p> |
| * Any changes made in {@link #onSharedElementStart(List, List, List)} that are not updated |
| * during layout should be corrected in onSharedElementEnd. For example, rotation or scale |
| * will not be affected by layout and if changed in |
| * {@link #onSharedElementStart(List, List, List)}, it will also have to be reset in |
| * onSharedElementEnd again to correct the end state. |
| * |
| * @param sharedElementNames The names of the shared elements that were accepted into |
| * the View hierarchy. |
| * @param sharedElements The shared elements that are part of the View hierarchy. |
| * @param sharedElementSnapshots The Views containing snap shots of the shared element |
| * from the launching Window. These elements will not |
| * be part of the scene, but will be positioned relative |
| * to the Window decor View. This list will be null for |
| * Fragment Transitions. |
| */ |
| public void onSharedElementEnd(List<String> sharedElementNames, |
| List<View> sharedElements, List<View> sharedElementSnapshots) {} |
| |
| /** |
| * Called after {@link #onMapSharedElements(java.util.List, java.util.Map)} when |
| * transferring shared elements in. Any shared elements that have no mapping will be in |
| * <var>rejectedSharedElements</var>. The elements remaining in |
| * <var>rejectedSharedElements</var> will be transitioned out of the Scene. If a |
| * View is removed from <var>rejectedSharedElements</var>, it must be handled by the |
| * <code>SharedElementCallback</code>. |
| * <p> |
| * Views in rejectedSharedElements will have their position and size set to the |
| * position of the calling shared element, relative to the Window decor View and contain |
| * snapshots of the View from the calling Activity or Fragment. This |
| * view may be safely added to the decor View's overlay to remain in position. |
| * </p> |
| * <p>This method is not called for Fragment Transitions. All rejected shared elements |
| * will be handled by the exit transition.</p> |
| * |
| * @param rejectedSharedElements Views containing visual information of shared elements |
| * that are not part of the entering scene. These Views |
| * are positioned relative to the Window decor View. A |
| * View removed from this list will not be transitioned |
| * automatically. |
| */ |
| public void onRejectSharedElements(List<View> rejectedSharedElements) {} |
| |
| /** |
| * Lets the SharedElementCallback adjust the mapping of shared element names to |
| * Views. |
| * |
| * @param names The names of all shared elements transferred from the calling Activity |
| * or Fragment in the order they were provided. |
| * @param sharedElements The mapping of shared element names to Views. The best guess |
| * will be filled into sharedElements based on the transitionNames. |
| */ |
| public void onMapSharedElements(List<String> names, Map<String, View> sharedElements) {} |
| |
| /** |
| * Creates a snapshot of a shared element to be used by the remote Activity and reconstituted |
| * with {@link #onCreateSnapshotView(android.content.Context, android.os.Parcelable)}. A |
| * null return value will mean that the remote Activity will have a null snapshot View in |
| * {@link #onSharedElementStart(java.util.List, java.util.List, java.util.List)} and |
| * {@link #onSharedElementEnd(java.util.List, java.util.List, java.util.List)}. |
| * |
| * <p>This is not called for Fragment Transitions.</p> |
| * |
| * @param sharedElement The shared element View to create a snapshot for. |
| * @param viewToGlobalMatrix A matrix containing a transform from the view to the screen |
| * coordinates. |
| * @param screenBounds The bounds of shared element in screen coordinate space. This is |
| * the bounds of the view with the viewToGlobalMatrix applied. |
| * @return A snapshot to send to the remote Activity to be reconstituted with |
| * {@link #onCreateSnapshotView(android.content.Context, android.os.Parcelable)} and passed |
| * into {@link #onSharedElementStart(java.util.List, java.util.List, java.util.List)} and |
| * {@link #onSharedElementEnd(java.util.List, java.util.List, java.util.List)}. |
| */ |
| public Parcelable onCaptureSharedElementSnapshot(View sharedElement, Matrix viewToGlobalMatrix, |
| RectF screenBounds) { |
| if (sharedElement instanceof ImageView) { |
| ImageView imageView = ((ImageView) sharedElement); |
| Drawable d = imageView.getDrawable(); |
| Drawable bg = imageView.getBackground(); |
| if (d != null && (bg == null || bg.getAlpha() == 0)) { |
| Bitmap bitmap = TransitionUtils.createDrawableBitmap(d, imageView); |
| if (bitmap != null) { |
| Bundle bundle = new Bundle(); |
| if (bitmap.getConfig() != Bitmap.Config.HARDWARE) { |
| bundle.putParcelable(BUNDLE_SNAPSHOT_BITMAP, bitmap); |
| } else { |
| HardwareBuffer hardwareBuffer = bitmap.getHardwareBuffer(); |
| bundle.putParcelable(BUNDLE_SNAPSHOT_HARDWARE_BUFFER, hardwareBuffer); |
| ColorSpace cs = bitmap.getColorSpace(); |
| if (cs != null) { |
| bundle.putInt(BUNDLE_SNAPSHOT_COLOR_SPACE, cs.getId()); |
| } |
| } |
| bundle.putString(BUNDLE_SNAPSHOT_IMAGE_SCALETYPE, |
| imageView.getScaleType().toString()); |
| if (imageView.getScaleType() == ScaleType.MATRIX) { |
| Matrix matrix = imageView.getImageMatrix(); |
| float[] values = new float[9]; |
| matrix.getValues(values); |
| bundle.putFloatArray(BUNDLE_SNAPSHOT_IMAGE_MATRIX, values); |
| } |
| return bundle; |
| } |
| } |
| } |
| if (mTempMatrix == null) { |
| mTempMatrix = new Matrix(viewToGlobalMatrix); |
| } else { |
| mTempMatrix.set(viewToGlobalMatrix); |
| } |
| ViewGroup parent = (ViewGroup) sharedElement.getParent(); |
| return TransitionUtils.createViewBitmap(sharedElement, mTempMatrix, screenBounds, parent); |
| } |
| |
| /** |
| * Reconstitutes a snapshot View from a Parcelable returned in |
| * {@link #onCaptureSharedElementSnapshot(android.view.View, android.graphics.Matrix, |
| * android.graphics.RectF)} to be used in {@link #onSharedElementStart(java.util.List, |
| * java.util.List, java.util.List)} and {@link #onSharedElementEnd(java.util.List, |
| * java.util.List, java.util.List)}. The returned View will be sized and positioned after |
| * this call so that it is ready to be added to the decor View's overlay. |
| * |
| * <p>This is not called for Fragment Transitions.</p> |
| * |
| * @param context The Context used to create the snapshot View. |
| * @param snapshot The Parcelable returned by {@link #onCaptureSharedElementSnapshot( |
| * android.view.View, android.graphics.Matrix, android.graphics.RectF)}. |
| * @return A View to be sent in {@link #onSharedElementStart(java.util.List, java.util.List, |
| * java.util.List)} and {@link #onSharedElementEnd(java.util.List, java.util.List, |
| * java.util.List)}. A null value will produce a null snapshot value for those two methods. |
| */ |
| public View onCreateSnapshotView(Context context, Parcelable snapshot) { |
| View view = null; |
| if (snapshot instanceof Bundle) { |
| Bundle bundle = (Bundle) snapshot; |
| HardwareBuffer buffer = bundle.getParcelable(BUNDLE_SNAPSHOT_HARDWARE_BUFFER, android.hardware.HardwareBuffer.class); |
| Bitmap bitmap = bundle.getParcelable(BUNDLE_SNAPSHOT_BITMAP, android.graphics.Bitmap.class); |
| if (buffer == null && bitmap == null) { |
| return null; |
| } |
| if (bitmap == null) { |
| ColorSpace colorSpace = null; |
| int colorSpaceId = bundle.getInt(BUNDLE_SNAPSHOT_COLOR_SPACE, 0); |
| if (colorSpaceId >= 0 && colorSpaceId < ColorSpace.Named.values().length) { |
| colorSpace = ColorSpace.get(ColorSpace.Named.values()[colorSpaceId]); |
| } |
| bitmap = Bitmap.wrapHardwareBuffer(buffer, colorSpace); |
| } |
| ImageView imageView = new ImageView(context); |
| view = imageView; |
| imageView.setImageBitmap(bitmap); |
| imageView.setScaleType( |
| ScaleType.valueOf(bundle.getString(BUNDLE_SNAPSHOT_IMAGE_SCALETYPE))); |
| if (imageView.getScaleType() == ScaleType.MATRIX) { |
| float[] values = bundle.getFloatArray(BUNDLE_SNAPSHOT_IMAGE_MATRIX); |
| Matrix matrix = new Matrix(); |
| matrix.setValues(values); |
| imageView.setImageMatrix(matrix); |
| } |
| } else if (snapshot instanceof Bitmap) { |
| Bitmap bitmap = (Bitmap) snapshot; |
| view = new View(context); |
| Resources resources = context.getResources(); |
| view.setBackground(new BitmapDrawable(resources, bitmap)); |
| } |
| return view; |
| } |
| |
| /** |
| * Called during an Activity Transition when the shared elements have arrived at the |
| * final location and are ready to be transferred. This method is called for both the |
| * source and destination Activities. |
| * <p> |
| * When the shared elements are ready to be transferred, |
| * {@link OnSharedElementsReadyListener#onSharedElementsReady()} |
| * must be called to trigger the transfer. |
| * <p> |
| * The default behavior is to trigger the transfer immediately. |
| * |
| * @param sharedElementNames The names of the shared elements that are being transferred.. |
| * @param sharedElements The shared elements that are part of the View hierarchy. |
| * @param listener The listener to call when the shared elements are ready to be hidden |
| * in the source Activity or shown in the destination Activity. |
| */ |
| public void onSharedElementsArrived(List<String> sharedElementNames, |
| List<View> sharedElements, OnSharedElementsReadyListener listener) { |
| listener.onSharedElementsReady(); |
| } |
| |
| /** |
| * Listener to be called after {@link |
| * SharedElementCallback#onSharedElementsArrived(List, List, OnSharedElementsReadyListener)} |
| * when the shared elements are ready to be hidden in the source Activity and shown in the |
| * destination Activity. |
| */ |
| public interface OnSharedElementsReadyListener { |
| |
| /** |
| * Call this method during or after the OnSharedElementsReadyListener has been received |
| * in {@link SharedElementCallback#onSharedElementsArrived(List, List, |
| * OnSharedElementsReadyListener)} to indicate that the shared elements are ready to be |
| * hidden in the source and shown in the destination Activity. |
| */ |
| void onSharedElementsReady(); |
| } |
| } |
