/*
* Copyright (C) 2010 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.widget;
import android.animation.AnimatorInflater;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.os.Handler;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.RemoteViews.OnClickHandler;
import java.util.ArrayList;
import java.util.HashMap;
/**
* Base class for a {@link AdapterView} that will perform animations
* when switching between its views.
*
* @attr ref android.R.styleable#AdapterViewAnimator_inAnimation
* @attr ref android.R.styleable#AdapterViewAnimator_outAnimation
* @attr ref android.R.styleable#AdapterViewAnimator_animateFirstView
* @attr ref android.R.styleable#AdapterViewAnimator_loopViews
*/
public abstract class AdapterViewAnimator extends AdapterView<Adapter>
implements RemoteViewsAdapter.RemoteAdapterConnectionCallback, Advanceable {
private static final String TAG = "RemoteViewAnimator";
/**
* The index of the current child, which appears anywhere from the beginning
* to the end of the current set of children, as specified by {@link #mActiveOffset}
*/
int mWhichChild = 0;
/**
* The index of the child to restore after the asynchronous connection from the
* RemoteViewsAdapter has been.
*/
private int mRestoreWhichChild = -1;
/**
* Whether or not the first view(s) should be animated in
*/
boolean mAnimateFirstTime = true;
/**
* Represents where the in the current window of
* views the current <code>mDisplayedChild</code> sits
*/
int mActiveOffset = 0;
/**
* The number of views that the {@link AdapterViewAnimator} keeps as children at any
* given time (not counting views that are pending removal, see {@link #mPreviousViews}).
*/
int mMaxNumActiveViews = 1;
/**
* Map of the children of the {@link AdapterViewAnimator}.
*/
HashMap<Integer, ViewAndMetaData> mViewsMap = new HashMap<Integer, ViewAndMetaData>();
/**
* List of views pending removal from the {@link AdapterViewAnimator}
*/
ArrayList<Integer> mPreviousViews;
/**
* The index, relative to the adapter, of the beginning of the window of views
*/
int mCurrentWindowStart = 0;
/**
* The index, relative to the adapter, of the end of the window of views
*/
int mCurrentWindowEnd = -1;
/**
* The same as {@link #mCurrentWindowStart}, except when the we have bounded
* {@link #mCurrentWindowStart} to be non-negative
*/
int mCurrentWindowStartUnbounded = 0;
/**
* Listens for data changes from the adapter
*/
AdapterDataSetObserver mDataSetObserver;
/**
* The {@link Adapter} for this {@link AdapterViewAnimator}
*/
Adapter mAdapter;
/**
* The {@link RemoteViewsAdapter} for this {@link AdapterViewAnimator}
*/
RemoteViewsAdapter mRemoteViewsAdapter;
/**
* The remote adapter containing the data to be displayed by this view to be set
*/
boolean mDeferNotifyDataSetChanged = false;
/**
* Specifies whether this is the first time the animator is showing views
*/
boolean mFirstTime = true;
/**
* Specifies if the animator should wrap from 0 to the end and vice versa
* or have hard boundaries at the beginning and end
*/
boolean mLoopViews = true;
/**
* The width and height of some child, used as a size reference in-case our
* dimensions are unspecified by the parent.
*/
int mReferenceChildWidth = -1;
int mReferenceChildHeight = -1;
/**
* In and out animations.
*/
ObjectAnimator mInAnimation;
ObjectAnimator mOutAnimation;
/**
* Current touch state.
*/
private int mTouchMode = TOUCH_MODE_NONE;
/**
* Private touch states.
*/
static final int TOUCH_MODE_NONE = 0;
static final int TOUCH_MODE_DOWN_IN_CURRENT_VIEW = 1;
static final int TOUCH_MODE_HANDLED = 2;
private Runnable mPendingCheckForTap;
private static final int DEFAULT_ANIMATION_DURATION = 200;
public AdapterViewAnimator(Context context) {
this(context, null);
}
public AdapterViewAnimator(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public AdapterViewAnimator(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public AdapterViewAnimator(
Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
final TypedArray a = context.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.AdapterViewAnimator, defStyleAttr, defStyleRes);
int resource = a.getResourceId(
com.android.internal.R.styleable.AdapterViewAnimator_inAnimation, 0);
if (resource > 0) {
setInAnimation(context, resource);
} else {
setInAnimation(getDefaultInAnimation());
}
resource = a.getResourceId(com.android.internal.R.styleable.AdapterViewAnimator_outAnimation, 0);
if (resource > 0) {
setOutAnimation(context, resource);
} else {
setOutAnimation(getDefaultOutAnimation());
}
boolean flag = a.getBoolean(
com.android.internal.R.styleable.AdapterViewAnimator_animateFirstView, true);
setAnimateFirstView(flag);
mLoopViews = a.getBoolean(
com.android.internal.R.styleable.AdapterViewAnimator_loopViews, false);
a.recycle();
initViewAnimator();
}
/**
* Initialize this {@link AdapterViewAnimator}
*/
private void initViewAnimator() {
mPreviousViews = new ArrayList<Integer>();
}
class ViewAndMetaData {
View view;
int relativeIndex;
int adapterPosition;
long itemId;
ViewAndMetaData(View view, int relativeIndex, int adapterPosition, long itemId) {
this.view = view;
this.relativeIndex = relativeIndex;
this.adapterPosition = adapterPosition;
this.itemId = itemId;
}
}
/**
* This method is used by subclasses to configure the animator to display the
* desired number of views, and specify the offset
*
* @param numVisibleViews The number of views the animator keeps in the {@link ViewGroup}
* @param activeOffset This parameter specifies where the current index ({@link #mWhichChild})
* sits within the window. For example if activeOffset is 1, and numVisibleViews is 3,
* and {@link #setDisplayedChild(int)} is called with 10, then the effective window will
* be the indexes 9, 10, and 11. In the same example, if activeOffset were 0, then the
* window would instead contain indexes 10, 11 and 12.
* @param shouldLoop If the animator is show view 0, and setPrevious() is called, do we
* we loop back to the end, or do we do nothing
*/
void configureViewAnimator(int numVisibleViews, int activeOffset) {
if (activeOffset > numVisibleViews - 1) {
// Throw an exception here.
}
mMaxNumActiveViews = numVisibleViews;
mActiveOffset = activeOffset;
mPreviousViews.clear();
mViewsMap.clear();
removeAllViewsInLayout();
mCurrentWindowStart = 0;
mCurrentWindowEnd = -1;
}
/**
* This class should be overridden by subclasses to customize view transitions within
* the set of visible views
*
* @param fromIndex The relative index within the window that the view was in, -1 if it wasn't
* in the window
* @param toIndex The relative index within the window that the view is going to, -1 if it is
* being removed
* @param view The view that is being animated
*/
void transformViewForTransition(int fromIndex, int toIndex, View view, boolean animate) {
if (fromIndex == -1) {
mInAnimation.setTarget(view);
mInAnimation.start();
} else if (toIndex == -1) {
mOutAnimation.setTarget(view);
mOutAnimation.start();
}
}
ObjectAnimator getDefaultInAnimation() {
ObjectAnimator anim = ObjectAnimator.ofFloat(null, "alpha", 0.0f, 1.0f);
anim.setDuration(DEFAULT_ANIMATION_DURATION);
return anim;
}
ObjectAnimator getDefaultOutAnimation() {
ObjectAnimator anim = ObjectAnimator.ofFloat(null, "alpha", 1.0f, 0.0f);
anim.setDuration(DEFAULT_ANIMATION_DURATION);
return anim;
}
/**
* Sets which child view will be displayed.
*
* @param whichChild the index of the child view to display
*/
@android.view.RemotableViewMethod
public void setDisplayedChild(int whichChild) {
setDisplayedChild(whichChild, true);
}
private void setDisplayedChild(int whichChild, boolean animate) {
if (mAdapter != null) {
mWhichChild = whichChild;
if (whichChild >= getWindowSize()) {
mWhichChild = mLoopViews ? 0 : getWindowSize() - 1;
} else if (whichChild < 0) {
mWhichChild = mLoopViews ? getWindowSize() - 1 : 0;
}
boolean hasFocus = getFocusedChild() != null;
// This will clear old focus if we had it
showOnly(mWhichChild, animate);
if (hasFocus) {
// Try to retake focus if we had it
requestFocus(FOCUS_FORWARD);
}
}
}
/**
* To be overridden by subclasses. This method applies a view / index specific
* transform to the child view.
*
* @param child
* @param relativeIndex
*/
void applyTransformForChildAtIndex(View child, int relativeIndex) {
}
/**
* Returns the index of the currently displayed child view.
*/
public int getDisplayedChild() {
return mWhichChild;
}
/**
* Manually shows the next child.
*/
public void showNext() {
setDisplayedChild(mWhichChild + 1);
}
/**
* Manually shows the previous child.
*/
public void showPrevious() {
setDisplayedChild(mWhichChild - 1);
}
int modulo(int pos, int size) {
if (size > 0) {
return (size + (pos % size)) % size;
} else {
return 0;
}
}
/**
* Get the view at this index relative to the current window's start
*
* @param relativeIndex Position relative to the current window's start
* @return View at this index, null if the index is outside the bounds
*/
View getViewAtRelativeIndex(int relativeIndex) {
if (relativeIndex >= 0 && relativeIndex <= getNumActiveViews() - 1 && mAdapter != null) {
int i = modulo(mCurrentWindowStartUnbounded + relativeIndex, getWindowSize());
if (mViewsMap.get(i) != null) {
return mViewsMap.get(i).view;
}
}
return null;
}
int getNumActiveViews() {
if (mAdapter != null) {
return Math.min(getCount() + 1, mMaxNumActiveViews);
} else {
return mMaxNumActiveViews;
}
}
int getWindowSize() {
if (mAdapter != null) {
int adapterCount = getCount();
if (adapterCount <= getNumActiveViews() && mLoopViews) {
return adapterCount*mMaxNumActiveViews;
} else {
return adapterCount;
}
} else {
return 0;
}
}
private ViewAndMetaData getMetaDataForChild(View child) {
for (ViewAndMetaData vm: mViewsMap.values()) {
if (vm.view == child) {
return vm;
}
}
return null;
}
LayoutParams createOrReuseLayoutParams(View v) {
final ViewGroup.LayoutParams currentLp = v.getLayoutParams();
if (currentLp instanceof ViewGroup.LayoutParams) {
LayoutParams lp = (LayoutParams) currentLp;
return lp;
}
return new ViewGroup.LayoutParams(0, 0);
}
void refreshChildren() {
if (mAdapter == null) return;
for (int i = mCurrentWindowStart; i <= mCurrentWindowEnd; i++) {
int index = modulo(i, getWindowSize());
int adapterCount = getCount();
// get the fresh child from the adapter
final View updatedChild = mAdapter.getView(modulo(i, adapterCount), null, this);
if (updatedChild.getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
updatedChild.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
}
if (mViewsMap.containsKey(index)) {
final FrameLayout fl = (FrameLayout) mViewsMap.get(index).view;
// add the new child to the frame, if it exists
if (updatedChild != null) {
// flush out the old child
fl.removeAllViewsInLayout();
fl.addView(updatedChild);
}
}
}
}
/**
* This method can be overridden so that subclasses can provide a custom frame in which their
* children can live. For example, StackView adds padding to its childrens' frames so as to
* accomodate for the highlight effect.
*
* @return The FrameLayout into which children can be placed.
*/
FrameLayout getFrameForChild() {
return new FrameLayout(mContext);
}
/**
* Shows only the specified child. The other displays Views exit the screen,
* optionally with the with the {@link #getOutAnimation() out animation} and
* the specified child enters the screen, optionally with the
* {@link #getInAnimation() in animation}.
*
* @param childIndex The index of the child to be shown.
* @param animate Whether or not to use the in and out animations, defaults
* to true.
*/
void showOnly(int childIndex, boolean animate) {
if (mAdapter == null) return;
final int adapterCount = getCount();
if (adapterCount == 0) return;
for (int i = 0; i < mPreviousViews.size(); i++) {
View viewToRemove = mViewsMap.get(mPreviousViews.get(i)).view;
mViewsMap.remove(mPreviousViews.get(i));
viewToRemove.clearAnimation();
if (viewToRemove instanceof ViewGroup) {
ViewGroup vg = (ViewGroup) viewToRemove;
vg.removeAllViewsInLayout();
}
// applyTransformForChildAtIndex here just allows for any cleanup
// associated with this view that may need to be done by a subclass
applyTransformForChildAtIndex(viewToRemove, -1);
removeViewInLayout(viewToRemove);
}
mPreviousViews.clear();
int newWindowStartUnbounded = childIndex - mActiveOffset;
int newWindowEndUnbounded = newWindowStartUnbounded + getNumActiveViews() - 1;
int newWindowStart = Math.max(0, newWindowStartUnbounded);
int newWindowEnd = Math.min(adapterCount - 1, newWindowEndUnbounded);
if (mLoopViews) {
newWindowStart = newWindowStartUnbounded;
newWindowEnd = newWindowEndUnbounded;
}
int rangeStart = modulo(newWindowStart, getWindowSize());
int rangeEnd = modulo(newWindowEnd, getWindowSize());
boolean wrap = false;
if (rangeStart > rangeEnd) {
wrap = true;
}
// This section clears out any items that are in our active views list
// but are outside the effective bounds of our window (this is becomes an issue
// at the extremities of the list, eg. where newWindowStartUnbounded < 0 or
// newWindowEndUnbounded > adapterCount - 1
for (Integer index : mViewsMap.keySet()) {
boolean remove = false;
if (!wrap && (index < rangeStart || index > rangeEnd)) {
remove = true;
} else if (wrap && (index > rangeEnd && index < rangeStart)) {
remove = true;
}
if (remove) {
View previousView = mViewsMap.get(index).view;
int oldRelativeIndex = mViewsMap.get(index).relativeIndex;
mPreviousViews.add(index);
transformViewForTransition(oldRelativeIndex, -1, previousView, animate);
}
}
// If the window has changed
if (!(newWindowStart == mCurrentWindowStart && newWindowEnd == mCurrentWindowEnd &&
newWindowStartUnbounded == mCurrentWindowStartUnbounded)) {
// Run through the indices in the new range
for (int i = newWindowStart; i <= newWindowEnd; i++) {
int index = modulo(i, getWindowSize());
int oldRelativeIndex;
if (mViewsMap.containsKey(index)) {
oldRelativeIndex = mViewsMap.get(index).relativeIndex;
} else {
oldRelativeIndex = -1;
}
int newRelativeIndex = i - newWindowStartUnbounded;
// If this item is in the current window, great, we just need to apply
// the transform for it's new relative position in the window, and animate
// between it's current and new relative positions
boolean inOldRange = mViewsMap.containsKey(index) && !mPreviousViews.contains(index);
if (inOldRange) {
View view = mViewsMap.get(index).view;
mViewsMap.get(index).relativeIndex = newRelativeIndex;
applyTransformForChildAtIndex(view, newRelativeIndex);
transformViewForTransition(oldRelativeIndex, newRelativeIndex, view, animate);
// Otherwise this view is new to the window
} else {
// Get the new view from the adapter, add it and apply any transform / animation
final int adapterPosition = modulo(i, adapterCount);
View newView = mAdapter.getView(adapterPosition, null, this);
long itemId = mAdapter.getItemId(adapterPosition);
// We wrap the new view in a FrameLayout so as to respect the contract
// with the adapter, that is, that we don't modify this view directly
FrameLayout fl = getFrameForChild();
// If the view from the adapter is null, we still keep an empty frame in place
if (newView != null) {
fl.addView(newView);
}
mViewsMap.put(index, new ViewAndMetaData(fl, newRelativeIndex,
adapterPosition, itemId));
addChild(fl);
applyTransformForChildAtIndex(fl, newRelativeIndex);
transformViewForTransition(-1, newRelativeIndex, fl, animate);
}
mViewsMap.get(index).view.bringToFront();
}
mCurrentWindowStart = newWindowStart;
mCurrentWindowEnd = newWindowEnd;
mCurrentWindowStartUnbounded = newWindowStartUnbounded;
if (mRemoteViewsAdapter != null) {
int adapterStart = modulo(mCurrentWindowStart, adapterCount);
int adapterEnd = modulo(mCurrentWindowEnd, adapterCount);
mRemoteViewsAdapter.setVisibleRangeHint(adapterStart, adapterEnd);
}
}
requestLayout();
invalidate();
}
private void addChild(View child) {
addViewInLayout(child, -1, createOrReuseLayoutParams(child));
// This code is used to obtain a reference width and height of a child in case we need
// to decide our own size. TODO: Do we want to update the size of the child that we're
// using for reference size? If so, when?
if (mReferenceChildWidth == -1 || mReferenceChildHeight == -1) {
int measureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
child.measure(measureSpec, measureSpec);
mReferenceChildWidth = child.getMeasuredWidth();
mReferenceChildHeight = child.getMeasuredHeight();
}
}
void showTapFeedback(View v) {
v.setPressed(true);
}
void hideTapFeedback(View v) {
v.setPressed(false);
}
void cancelHandleClick() {
View v = getCurrentView();
if (v != null) {
hideTapFeedback(v);
}
mTouchMode = TOUCH_MODE_NONE;
}
final class CheckForTap implements Runnable {
public void run() {
if (mTouchMode == TOUCH_MODE_DOWN_IN_CURRENT_VIEW) {
View v = getCurrentView();
showTapFeedback(v);
}
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
int action = ev.getAction();
boolean handled = false;
switch (action) {
case MotionEvent.ACTION_DOWN: {
View v = getCurrentView();
if (v != null) {
if (isTransformedTouchPointInView(ev.getX(), ev.getY(), v, null)) {
if (mPendingCheckForTap == null) {
mPendingCheckForTap = new CheckForTap();
}
mTouchMode = TOUCH_MODE_DOWN_IN_CURRENT_VIEW;
postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
}
}
break;
}
case MotionEvent.ACTION_MOVE: break;
case MotionEvent.ACTION_POINTER_UP: break;
case MotionEvent.ACTION_UP: {
if (mTouchMode == TOUCH_MODE_DOWN_IN_CURRENT_VIEW) {
final View v = getCurrentView();
final ViewAndMetaData viewData = getMetaDataForChild(v);
if (v != null) {
if (isTransformedTouchPointInView(ev.getX(), ev.getY(), v, null)) {
final Handler handler = getHandler();
if (handler != null) {
handler.removeCallbacks(mPendingCheckForTap);
}
showTapFeedback(v);
postDelayed(new Runnable() {
public void run() {
hideTapFeedback(v);
post(new Runnable() {
public void run() {
if (viewData != null) {
performItemClick(v, viewData.adapterPosition,
viewData.itemId);
} else {
performItemClick(v, 0, 0);
}
}
});
}
}, ViewConfiguration.getPressedStateDuration());
handled = true;
}
}
}
mTouchMode = TOUCH_MODE_NONE;
break;
}
case MotionEvent.ACTION_CANCEL: {
View v = getCurrentView();
if (v != null) {
hideTapFeedback(v);
}
mTouchMode = TOUCH_MODE_NONE;
}
}
return handled;
}
private void measureChildren() {
final int count = getChildCount();
final int childWidth = getMeasuredWidth() - mPaddingLeft - mPaddingRight;
final int childHeight = getMeasuredHeight() - mPaddingTop - mPaddingBottom;
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
child.measure(MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY));
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
final int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
final int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
boolean haveChildRefSize = (mReferenceChildWidth != -1 && mReferenceChildHeight != -1);
// We need to deal with the case where our parent hasn't told us how
// big we should be. In this case we try to use the desired size of the first
// child added.
if (heightSpecMode == MeasureSpec.UNSPECIFIED) {
heightSpecSize = haveChildRefSize ? mReferenceChildHeight + mPaddingTop +
mPaddingBottom : 0;
} else if (heightSpecMode == MeasureSpec.AT_MOST) {
if (haveChildRefSize) {
int height = mReferenceChildHeight + mPaddingTop + mPaddingBottom;
if (height > heightSpecSize) {
heightSpecSize |= MEASURED_STATE_TOO_SMALL;
} else {
heightSpecSize = height;
}
}
}
if (widthSpecMode == MeasureSpec.UNSPECIFIED) {
widthSpecSize = haveChildRefSize ? mReferenceChildWidth + mPaddingLeft +
mPaddingRight : 0;
} else if (heightSpecMode == MeasureSpec.AT_MOST) {
if (haveChildRefSize) {
int width = mReferenceChildWidth + mPaddingLeft + mPaddingRight;
if (width > widthSpecSize) {
widthSpecSize |= MEASURED_STATE_TOO_SMALL;
} else {
widthSpecSize = width;
}
}
}
setMeasuredDimension(widthSpecSize, heightSpecSize);
measureChildren();
}
void checkForAndHandleDataChanged() {
boolean dataChanged = mDataChanged;
if (dataChanged) {
post(new Runnable() {
public void run() {
handleDataChanged();
// if the data changes, mWhichChild might be out of the bounds of the adapter
// in this case, we reset mWhichChild to the beginning
if (mWhichChild >= getWindowSize()) {
mWhichChild = 0;
showOnly(mWhichChild, false);
} else if (mOldItemCount != getCount()) {
showOnly(mWhichChild, false);
}
refreshChildren();
requestLayout();
}
});
}
mDataChanged = false;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
checkForAndHandleDataChanged();
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
int childRight = mPaddingLeft + child.getMeasuredWidth();
int childBottom = mPaddingTop + child.getMeasuredHeight();
child.layout(mPaddingLeft, mPaddingTop, childRight, childBottom);
}
}
static class SavedState extends BaseSavedState {
int whichChild;
/**
* Constructor called from {@link AdapterViewAnimator#onSaveInstanceState()}
*/
SavedState(Parcelable superState, int whichChild) {
super(superState);
this.whichChild = whichChild;
}
/**
* Constructor called from {@link #CREATOR}
*/
private SavedState(Parcel in) {
super(in);
this.whichChild = in.readInt();
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(this.whichChild);
}
@Override
public String toString() {
return "AdapterViewAnimator.SavedState{ whichChild = " + this.whichChild + " }";
}
public static final Parcelable.Creator<SavedState> CREATOR
= new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
@Override
public Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
if (mRemoteViewsAdapter != null) {
mRemoteViewsAdapter.saveRemoteViewsCache();
}
return new SavedState(superState, mWhichChild);
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
// Here we set mWhichChild in addition to setDisplayedChild
// We do the former in case mAdapter is null, and hence setDisplayedChild won't
// set mWhichChild
mWhichChild = ss.whichChild;
// When using RemoteAdapters, the async connection process can lead to
// onRestoreInstanceState to be called before setAdapter(), so we need to save the previous
// values to restore the list position after we connect, and can skip setting the displayed
// child until then.
if (mRemoteViewsAdapter != null && mAdapter == null) {
mRestoreWhichChild = mWhichChild;
} else {
setDisplayedChild(mWhichChild, false);
}
}
/**
* Returns the View corresponding to the currently displayed child.
*
* @return The View currently displayed.
*
* @see #getDisplayedChild()
*/
public View getCurrentView() {
return getViewAtRelativeIndex(mActiveOffset);
}
/**
* Returns the current animation used to animate a View that enters the screen.
*
* @return An Animation or null if none is set.
*
* @see #setInAnimation(android.animation.ObjectAnimator)
* @see #setInAnimation(android.content.Context, int)
*/
public ObjectAnimator getInAnimation() {
return mInAnimation;
}
/**
* Specifies the animation used to animate a View that enters the screen.
*
* @param inAnimation The animation started when a View enters the screen.
*
* @see #getInAnimation()
* @see #setInAnimation(android.content.Context, int)
*/
public void setInAnimation(ObjectAnimator inAnimation) {
mInAnimation = inAnimation;
}
/**
* Returns the current animation used to animate a View that exits the screen.
*
* @return An Animation or null if none is set.
*
* @see #setOutAnimation(android.animation.ObjectAnimator)
* @see #setOutAnimation(android.content.Context, int)
*/
public ObjectAnimator getOutAnimation() {
return mOutAnimation;
}
/**
* Specifies the animation used to animate a View that exit the screen.
*
* @param outAnimation The animation started when a View exit the screen.
*
* @see #getOutAnimation()
* @see #setOutAnimation(android.content.Context, int)
*/
public void setOutAnimation(ObjectAnimator outAnimation) {
mOutAnimation = outAnimation;
}
/**
* Specifies the animation used to animate a View that enters the screen.
*
* @param context The application's environment.
* @param resourceID The resource id of the animation.
*
* @see #getInAnimation()
* @see #setInAnimation(android.animation.ObjectAnimator)
*/
public void setInAnimation(Context context, int resourceID) {
setInAnimation((ObjectAnimator) AnimatorInflater.loadAnimator(context, resourceID));
}
/**
* Specifies the animation used to animate a View that exit the screen.
*
* @param context The application's environment.
* @param resourceID The resource id of the animation.
*
* @see #getOutAnimation()
* @see #setOutAnimation(android.animation.ObjectAnimator)
*/
public void setOutAnimation(Context context, int resourceID) {
setOutAnimation((ObjectAnimator) AnimatorInflater.loadAnimator(context, resourceID));
}
/**
* Indicates whether the current View should be animated the first time
* the ViewAnimation is displayed.
*
* @param animate True to animate the current View the first time it is displayed,
* false otherwise.
*/
public void setAnimateFirstView(boolean animate) {
mAnimateFirstTime = animate;
}
@Override
public int getBaseline() {
return (getCurrentView() != null) ? getCurrentView().getBaseline() : super.getBaseline();
}
@Override
public Adapter getAdapter() {
return mAdapter;
}
@Override
public void setAdapter(Adapter adapter) {
if (mAdapter != null && mDataSetObserver != null) {
mAdapter.unregisterDataSetObserver(mDataSetObserver);
}
mAdapter = adapter;
checkFocus();
if (mAdapter != null) {
mDataSetObserver = new AdapterDataSetObserver();
mAdapter.registerDataSetObserver(mDataSetObserver);
mItemCount = mAdapter.getCount();
}
setFocusable(true);
mWhichChild = 0;
showOnly(mWhichChild, false);
}
/**
* Sets up this AdapterViewAnimator to use a remote views adapter which connects to a
* RemoteViewsService through the specified intent.
*
* @param intent the intent used to identify the RemoteViewsService for the adapter to
* connect to.
*/
@android.view.RemotableViewMethod
public void setRemoteViewsAdapter(Intent intent) {
// Ensure that we don't already have a RemoteViewsAdapter that is bound to an existing
// service handling the specified intent.
if (mRemoteViewsAdapter != null) {
Intent.FilterComparison fcNew = new Intent.FilterComparison(intent);
Intent.FilterComparison fcOld = new Intent.FilterComparison(
mRemoteViewsAdapter.getRemoteViewsServiceIntent());
if (fcNew.equals(fcOld)) {
return;
}
}
mDeferNotifyDataSetChanged = false;
// Otherwise, create a new RemoteViewsAdapter for binding
mRemoteViewsAdapter = new RemoteViewsAdapter(getContext(), intent, this);
if (mRemoteViewsAdapter.isDataReady()) {
setAdapter(mRemoteViewsAdapter);
}
}
/**
* Sets up the onClickHandler to be used by the RemoteViewsAdapter when inflating RemoteViews
*
* @param handler The OnClickHandler to use when inflating RemoteViews.
*
* @hide
*/
public void setRemoteViewsOnClickHandler(OnClickHandler handler) {
// Ensure that we don't already have a RemoteViewsAdapter that is bound to an existing
// service handling the specified intent.
if (mRemoteViewsAdapter != null) {
mRemoteViewsAdapter.setRemoteViewsOnClickHandler(handler);
}
}
@Override
public void setSelection(int position) {
setDisplayedChild(position);
}
@Override
public View getSelectedView() {
return getViewAtRelativeIndex(mActiveOffset);
}
/**
* This defers a notifyDataSetChanged on the pending RemoteViewsAdapter if it has not
* connected yet.
*/
public void deferNotifyDataSetChanged() {
mDeferNotifyDataSetChanged = true;
}
/**
* Called back when the adapter connects to the RemoteViewsService.
*/
public boolean onRemoteAdapterConnected() {
if (mRemoteViewsAdapter != mAdapter) {
setAdapter(mRemoteViewsAdapter);
if (mDeferNotifyDataSetChanged) {
mRemoteViewsAdapter.notifyDataSetChanged();
mDeferNotifyDataSetChanged = false;
}
// Restore the previous position (see onRestoreInstanceState)
if (mRestoreWhichChild > -1) {
setDisplayedChild(mRestoreWhichChild, false);
mRestoreWhichChild = -1;
}
return false;
} else if (mRemoteViewsAdapter != null) {
mRemoteViewsAdapter.superNotifyDataSetChanged();
return true;
}
return false;
}
/**
* Called back when the adapter disconnects from the RemoteViewsService.
*/
public void onRemoteAdapterDisconnected() {
// If the remote adapter disconnects, we keep it around
// since the currently displayed items are still cached.
// Further, we want the service to eventually reconnect
// when necessary, as triggered by this view requesting
// items from the Adapter.
}
/**
* Called by an {@link android.appwidget.AppWidgetHost} in order to advance the current view when
* it is being used within an app widget.
*/
public void advance() {
showNext();
}
/**
* Called by an {@link android.appwidget.AppWidgetHost} to indicate that it will be
* automatically advancing the views of this {@link AdapterViewAnimator} by calling
* {@link AdapterViewAnimator#advance()} at some point in the future. This allows subclasses to
* perform any required setup, for example, to stop automatically advancing their children.
*/
public void fyiWillBeAdvancedByHostKThx() {
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
event.setClassName(AdapterViewAnimator.class.getName());
}
@Override
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
info.setClassName(AdapterViewAnimator.class.getName());
}
}
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