| /* |
| * 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.Canvas; |
| import android.graphics.Matrix; |
| import android.graphics.RectF; |
| import android.graphics.drawable.BitmapDrawable; |
| import android.os.Parcelable; |
| import android.transition.TransitionUtils; |
| import android.view.View; |
| |
| 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; |
| |
| static final SharedElementCallback NULL_CALLBACK = new SharedElementCallback() { |
| }; |
| |
| /** |
| * Called immediately after the start state is set for the shared element. |
| * The shared element will start at the size and position of the shared element |
| * in the launching Activity or Fragment. |
| * |
| * @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) {} |
| |
| /** |
| * Called after the end state is set for the shared element, but before the end state |
| * is captured by the shared element transition. |
| * <p> |
| * Any customization done in |
| * {@link #onSharedElementStart(java.util.List, java.util.List, java.util.List)} |
| * may need to be modified to the final state of the shared element if it is not |
| * automatically corrected by layout. For example, rotation or scale will not |
| * be affected by layout and if changed in {@link #onSharedElementStart(java.util.List, |
| * java.util.List, java.util.List)}, it will also have to be set here again to correct |
| * the end state. |
| * </p> |
| * |
| * @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 (mTempMatrix == null) { |
| mTempMatrix = new Matrix(viewToGlobalMatrix); |
| } else { |
| mTempMatrix.set(viewToGlobalMatrix); |
| } |
| return TransitionUtils.createViewBitmap(sharedElement, mTempMatrix, screenBounds); |
| } |
| |
| /** |
| * 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 Bitmap) { |
| Bitmap bitmap = (Bitmap) snapshot; |
| view = new View(context); |
| Resources resources = context.getResources(); |
| view.setBackground(new BitmapDrawable(resources, bitmap)); |
| } |
| return view; |
| } |
| } |