我在我的应用程序中使用 sharedElementTransition 并且我使用了 sharedElementCallback 的自定义类来在运行时更新视图。它有时会导致 OutOfMemory 错误，因此我对其进行了搜索，并从该解决方案中使用了 LeakFreeSupportSharedElementCallback 代码来避免崩溃，但我仍然经常收到以下崩溃日志。
Fatal Exception: java.lang.OutOfMemoryError: Failed to allocate a 8357052 byte allocation with 953048 free bytes and 930KB until OOM
at dalvik.system.VMRuntime.newNonMovableArray(VMRuntime.java)
at android.graphics.Bitmap.nativeCopy(Bitmap.java)
at android.graphics.Bitmap.copy(Bitmap.java:684)
at com.fayvo.ui.main.home.post.PostDetailSharedElementCallback.onCreateSnapshotView(PostDetailSharedElementCallback.java:279)
at android.support.v4.app.ActivityCompat$SharedElementCallback21Impl.onCreateSnapshotView(ActivityCompat.java:609)
at android.app.ActivityTransitionCoordinator.createSnapshots(ActivityTransitionCoordinator.java:666)
at android.app.EnterTransitionCoordinator.startSharedElementTransition(EnterTransitionCoordinator.java:400)
at android.app.EnterTransitionCoordinator.-wrap4(EnterTransitionCoordinator.java)
at android.app.EnterTransitionCoordinator$5$1$1.run(EnterTransitionCoordinator.java:475)
at android.app.ActivityTransitionCoordinator.startTransition(ActivityTransitionCoordinator.java:836)
at android.app.EnterTransitionCoordinator$5$1.onPreDraw(EnterTransitionCoordinator.java:472)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:1013)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2513)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1522)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7098)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:927)
at android.view.Choreographer.doCallbacks(Choreographer.java:702)
at android.view.Choreographer.doFrame(Choreographer.java:638)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:913)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
自定义回调类：
public class CustomSharedElementCallback extends SharedElementCallback {
static final String BUNDLE_SNAPSHOT_BITMAP = "BUNDLE_SNAPSHOT_BITMAP";
static final String BUNDLE_SNAPSHOT_IMAGE_SCALETYPE = "BUNDLE_SNAPSHOT_IMAGE_SCALETYPE";
static final String BUNDLE_SNAPSHOT_IMAGE_MATRIX = "BUNDLE_SNAPSHOT_IMAGE_MATRIX";
static final String BUNDLE_SNAPSHOT_TYPE = "BUNDLE_SNAPSHOT_TYPE";
static final String BUNDLE_SNAPSHOT_TYPE_IMAGE_VIEW = "BUNDLE_SNAPSHOT_TYPE";
private static int MAX_IMAGE_SIZE = (1024 * 1024);
private List<View> mSharedElements;
private int currentPosition = 0;
private boolean enableChangeImageTransform;
private SparseArray<Matrix> tempMatrixes;
public PostDetailSharedElementCallback() {
mSharedElements = new ArrayList<>();
tempMatrixes = new SparseArray<>();
}
@Override
public void onSharedElementStart(List<String> sharedElementNames,
List<View> sharedElements,
List<View> sharedElementSnapshots) {
/*AppLogger.d("usm_shared_callback_0.1", "onSharedElementStart: " + sharedElementNames.get(0)
+ " ,enableChangeImageTransform= " + enableChangeImageTransform
);*/
boolean allowTransform = enableChangeImageTransform && sharedElements != null && sharedElements.size() > 0;
if (allowTransform && sharedElements.get(0) instanceof CustomPhotoView) {
((CustomPhotoView) sharedElements.get(0)).setScaleType(ImageView.ScaleType.CENTER_CROP);
} else if (allowTransform && sharedElements.get(0) instanceof ImageView) {
((ImageView) sharedElements.get(0)).setScaleType(ImageView.ScaleType.FIT_CENTER);
}
}
@Override
public void onSharedElementEnd(List<String> sharedElementNames, List<View> sharedElements, List<View> sharedElementSnapshots) {
/*AppLogger.d("usm_shared_callback_0.2", "onSharedElementEnd: " + sharedElementNames.get(0)
+ " ,enableChangeImageTransform= " + enableChangeImageTransform
);*/
boolean allowTransform = enableChangeImageTransform && sharedElements != null && sharedElements.size() > 0;
if (allowTransform && sharedElements.get(0) instanceof CustomPhotoView) {
((CustomPhotoView) sharedElements.get(0)).setScaleType(ImageView.ScaleType.FIT_CENTER);
// updateCloudChipBoxTagsView(sharedElementNames, sharedElements);
updateBoxIconView(sharedElementNames, sharedElements);
updateUserNameView(sharedElementNames, sharedElements);
} else if (allowTransform && sharedElements.get(0) instanceof ImageView) {
((ImageView) sharedElements.get(0)).setScaleType(ImageView.ScaleType.CENTER_CROP);
}
}
private void updateCloudChipBoxTagsView(List<String> sharedElementNames, List<View> sharedElements) {
int i = 0;
for (String sharedName : sharedElementNames) {
if (sharedName.contains(PostTags.TRANSITION_NAME_TAGS)) {
if (sharedElements.get(i) instanceof ChipCloud) {
ChipCloud chipCloud = ((ChipCloud) sharedElements.get(i));
int textColor = ContextCompat.getColor(chipCloud.getContext(), R.color.fayvo_color);
// adding modifyChips method to make animation transition experience a bit better
chipCloud.modifyChips(chipCloud.getContext().getResources().getDimension(R.dimen.hint_text_size), textColor);
break;
}
}
i++;
}
}
private void updateBoxIconView(List<String> sharedElementNames, List<View> sharedElements) {
int i = 0;
for (String sharedName : sharedElementNames) {
if (sharedName.contains(PostTags.TRANSITION_NAME_BOX_ICON)) {
if (sharedElements.get(i) instanceof ImageView) {
ImageView ivBoxIcon = (ImageView) sharedElements.get(i);
int color = ContextCompat.getColor(ivBoxIcon.getContext(), R.color.fayvo_color);
ivBoxIcon.setColorFilter(color);
break;
}
}
i++;
}
}
private void updateUserNameView(List<String> sharedElementNames, List<View> sharedElements) {
int i = 0;
for (String sharedName : sharedElementNames) {
if (sharedName.contains(PostTags.TRANSITION_NAME_USERNAME)) {
if (sharedElements.get(i) instanceof TextView) {
TextView textView = (TextView) sharedElements.get(i);
int color = ContextCompat.getColor(textView.getContext(), R.color.black);
float textSizePx = textView.getContext().getResources().getDimension(R.dimen.et_text_size);
textView.setTextColor(color);
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSizePx);
break;
}
}
i++;
}
}
@Override
public void onMapSharedElements(List<String> names, Map<String, View> sharedElements) {
removeObsoleteElements(names, sharedElements, mapObsoleteElements(names));
// update transition names
setTransitionNames();
for (int i = 0; i < mSharedElements.size(); i++)
mapSharedElement(names, sharedElements, mSharedElements.get(i));
}
public int getCurrentPosition() {
return currentPosition;
}
public void setCurrentPosition(int position) {
// AppLogger.d("usm_shared_callback_1", "currentPosition= " + position);
this.currentPosition = position;
}
public void setEnableChangeImageTransform(boolean enableTransform) {
this.enableChangeImageTransform = enableTransform;
}
/**
* This method is used to set Transition name of shared views.
* Note: Keep the sequence exactly same in which the views are
* passed for transition.
*/
public void setTransitionNames() {
// AppLogger.d("usm_shared_callback_2", "Setting transition names: " + currentPosition);
if (mSharedElements.size() > 0)
ViewCompat.setTransitionName(mSharedElements.get(0), PostTags.TRANSITION_NAME_POST_BODY + currentPosition);
if (mSharedElements.size() > 1)
ViewCompat.setTransitionName(mSharedElements.get(1), PostTags.TRANSITION_NAME_USER_PIC + currentPosition);
if (mSharedElements.size() > 2)
ViewCompat.setTransitionName(mSharedElements.get(2), PostTags.TRANSITION_NAME_USERNAME + currentPosition);
if (mSharedElements.size() > 3)
ViewCompat.setTransitionName(mSharedElements.get(3), PostTags.TRANSITION_NAME_TAGS + currentPosition);
if (mSharedElements.size() > 4)
ViewCompat.setTransitionName(mSharedElements.get(4), PostTags.TRANSITION_NAME_BOX_ICON + currentPosition);
}
public List<View> getSharedViews() {
// AppLogger.d("usm_shared_callback_4", "setSharedViews is called");
if (mSharedElements != null)
return mSharedElements;
return null;
}
public void setSharedViews(@NonNull View... sharedViews) {
// AppLogger.d("usm_shared_callback_4", "setSharedViews is called");
clearSharedViews();
for (View view : sharedViews) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
mSharedElements.add(view);
}
}
}
public void clearSharedViews() {
mSharedElements.clear();
tempMatrixes.clear();
}
/**
* Maps all views that don't start with "android" namespace.
*
* @param names All shared element names.
* @return The obsolete shared element names.
*/
@NonNull
private List<String> mapObsoleteElements(List<String> names) {
List<String> elementsToRemove = new ArrayList<>(names.size());
for (String name : names) {
if (name.startsWith("android")) continue;
elementsToRemove.add(name);
}
return elementsToRemove;
}
/**
* Removes obsolete elements from names and shared elements.
*
* @param names Shared element names.
* @param sharedElements Shared elements.
* @param elementsToRemove The elements that should be removed.
*/
private void removeObsoleteElements(List<String> names,
Map<String, View> sharedElements,
List<String> elementsToRemove) {
if (elementsToRemove.size() > 0) {
names.removeAll(elementsToRemove);
for (String elementToRemove : elementsToRemove) {
sharedElements.remove(elementToRemove);
}
}
}
/**
* Puts a shared element to transitions and names.
*
* @param names The names for this transition.
* @param sharedElements The elements for this transition.
* @param view The view to add.
*/
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void mapSharedElement(List<String> names, Map<String, View> sharedElements, View view) {
String transitionName = view.getTransitionName();
names.add(transitionName);
sharedElements.put(transitionName, view);
}
/**
* This method is overridden to avoid memory leaks
* @param context
* @param snapshot
* @return
*/
@Override
public View onCreateSnapshotView(Context context, Parcelable snapshot) {
// AppLogger.d("usm_shared_element_call_back", "onCreateSnapshotView: mSharedElements= " + mSharedElements.size());
View view = null;
if (snapshot instanceof Bundle) {
Bundle bundle = (Bundle) snapshot;
Bitmap bitmap = bundle.getParcelable(BUNDLE_SNAPSHOT_BITMAP);
if (bitmap == null) {
bundle.clear();
return null;
}
// Curiously, this is required to have the bitmap be GCed almost immediately after transition ends
// otherwise, garbage-collectable mem will still build up quickly
bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, false);
if (bitmap == null) {
return null;
}
if (BUNDLE_SNAPSHOT_TYPE_IMAGE_VIEW.equals(((Bundle) snapshot).getString(BUNDLE_SNAPSHOT_TYPE))) {
ImageView imageView = new ImageView(context);
view = imageView;
imageView.setImageBitmap(bitmap);
imageView.setScaleType(
ImageView.ScaleType.valueOf(bundle.getString(BUNDLE_SNAPSHOT_IMAGE_SCALETYPE)));
if (imageView.getScaleType() == ImageView.ScaleType.MATRIX) {
float[] values = bundle.getFloatArray(BUNDLE_SNAPSHOT_IMAGE_MATRIX);
Matrix matrix = new Matrix();
matrix.setValues(values);
imageView.setImageMatrix(matrix);
}
} else {
view = new View(context);
Resources resources = context.getResources();
view.setBackground(new BitmapDrawable(resources, bitmap));
}
bundle.clear();
}
return view;
// return super.onCreateSnapshotView(context, snapshot);
}
/**
* This method is overridden to avoid memory leaks
* @param sharedElement
* @param viewToGlobalMatrix
* @param screenBounds
* @return
*/
@Override
public Parcelable onCaptureSharedElementSnapshot(View sharedElement, Matrix viewToGlobalMatrix, RectF screenBounds) {
//AppLogger.d("usm_shared_element_call_back", "onCaptureSharedElementSnapshot: mSharedElements= " + mSharedElements.size()
// + " ,sharedElement name= " + sharedElement.getTransitionName() + " ,id= " + sharedElement.getId());
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);
if (bitmap != null) {
Bundle bundle = new Bundle();
bundle.putParcelable(BUNDLE_SNAPSHOT_BITMAP, bitmap);
bundle.putString(BUNDLE_SNAPSHOT_IMAGE_SCALETYPE,
imageView.getScaleType().toString());
if (imageView.getScaleType() == ImageView.ScaleType.MATRIX) {
Matrix matrix = imageView.getImageMatrix();
float[] values = new float[9];
matrix.getValues(values);
bundle.putFloatArray(BUNDLE_SNAPSHOT_IMAGE_MATRIX, values);
}
bundle.putString(BUNDLE_SNAPSHOT_TYPE, BUNDLE_SNAPSHOT_TYPE_IMAGE_VIEW);
return bundle;
}
}
}
if (tempMatrixes.get(sharedElement.getId(), null) == null) {
tempMatrixes.put(sharedElement.getId(), new Matrix(viewToGlobalMatrix));
} else {
tempMatrixes.get(sharedElement.getId()).set(viewToGlobalMatrix);
}
Bundle bundle = new Bundle();
Bitmap bitmap = TransitionUtils.createViewBitmap(sharedElement, tempMatrixes.get(sharedElement.getId()), screenBounds);
bundle.putParcelable(BUNDLE_SNAPSHOT_BITMAP, bitmap);
return bundle;
// return super.onCaptureSharedElementSnapshot(sharedElement, viewToGlobalMatrix, screenBounds);
}
}