我想实现如下图所示的动画。 
我已经用过ThreePhaseBottomLibrary根据我的经验，当我向上滚动时，动画应该与上图平行!
下面是我的 fragment 类。除了按屏幕显示此图像并行动画外，它工作正常:
Myfragment.java
public class MyFragment extends BottomSheetFragment {
private BottomSheetLayout mBottomSheetLayout;
private ImageView mBottomSheetBackgroundImageView;
private int mBottomSheetHeight;
private ImageView movingIconImageView;
private AppBarLayout mAppBarLayout;
private int mMStartMarginBottom;
private int mMStartMarginLeft;
private Toolbar mToolbar;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_my, container, false);
mBottomSheetHeight = getResources().getDimensionPixelSize(R.dimen.header_height);
mAppBarLayout = (AppBarLayout) view.findViewById(R.id.appbar);
view.setMinimumHeight(getResources().getDisplayMetrics().heightPixels);
CollapsingToolbarLayout collapsingToolbar = (CollapsingToolbarLayout) view.findViewById(R.id.collapsing_toolbar);
//collapsingToolbar.setTitle("Title");
collapsingToolbar.setTitleEnabled(false);
mToolbar = (Toolbar) view.findViewById(R.id.toolbar);
//final AppCompatActivity activity = (AppCompatActivity) getActivity();
//activity.setSupportActionBar(toolbar);
//final ActionBar actionBar = activity.getSupportActionBar();
//actionBar.setDisplayHomeAsUpEnabled(true);
//actionBar.setTitle(null);
mToolbar.setNavigationIcon(R.drawable.abc_ic_ab_back_mtrl_am_alpha);
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mBottomSheetLayout.dismissSheet();
}
});
mToolbar.setAlpha(0);
mBottomSheetBackgroundImageView = (ImageView) view.findViewById(R.id.backdrop);
mBottomSheetBackgroundImageView.setAlpha(0.0f);
movingIconImageView = (ImageView) view.findViewById(R.id.movingIconImageView);
Glide.with(this).load(R.drawable.cheese_1).centerCrop().into(mBottomSheetBackgroundImageView);
if (mBottomSheetLayout != null)
mBottomSheetLayout.setAppBarLayout(mAppBarLayout);
final int actionBarHeight = getActionBarHeight(getActivity());
mMStartMarginBottom = getResources().getDimensionPixelSize(R.dimen.header_view_start_margin_bottom);
mMStartMarginLeft = getResources().getDimensionPixelSize(R.dimen.header_view_start_margin_left);
movingIconImageView.setPivotX(0);
final float actionBarIconPadding = getResources().getDimensionPixelSize(R.dimen.action_bar_icon_padding);
mAppBarLayout.addOnOffsetChangedListener(new OnOffsetChangedListener() {
float startY = 0;
float scaleDiff = 0;
@Override
public void onOffsetChanged(final AppBarLayout appBarLayout, final int verticalOffset) {
if (mBottomSheetLayout != null && mBottomSheetLayout.isSheetShowing() && mBottomSheetLayout.getState() == State.EXPANDED) {
float progress = (float) -verticalOffset / mAppBarLayout.getTotalScrollRange();
movingIconImageView.setX(mMStartMarginLeft + (progress * (actionBarHeight - mMStartMarginLeft)));
if (startY == 0)
startY = movingIconImageView.getY();
if (scaleDiff == 0) {
scaleDiff = 1 - (actionBarHeight - actionBarIconPadding) / movingIconImageView.getHeight();
movingIconImageView.setPivotY(movingIconImageView.getHeight());
}
movingIconImageView.setScaleX(1f - progress * scaleDiff);
movingIconImageView.setScaleY(1f - progress * scaleDiff);
movingIconImageView.setY(startY - progress * actionBarIconPadding / 2 + mMStartMarginBottom * progress);
}
}
});
return view;
}
/**
* returns the height of the action bar
*/
public static int getActionBarHeight(final Context context) {
// based on http://stackoverflow.com/questions/12301510/how-to-get-the-actionbar-height
final TypedValue tv = new TypedValue();
int actionBarHeight = 0;
if (context.getTheme().resolveAttribute(R.attr.actionBarSize, tv, true))
actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources()
.getDisplayMetrics());
return actionBarHeight;
}
public void setBottomSheetLayout(final BottomSheetLayout bottomSheetLayout) {
mBottomSheetLayout = bottomSheetLayout;
if (mBottomSheetLayout != null && mAppBarLayout != null)
mBottomSheetLayout.setAppBarLayout(mAppBarLayout);
mBottomSheetLayout.addOnSheetStateChangeListener(new OnSheetStateChangeListener() {
private ViewPropertyAnimator mToolbarAnimation;
State lastState;
@Override
public void onSheetStateChanged(final State state) {
if (lastState == state)
return;
lastState = state;
if (state != State.EXPANDED) {
if (mToolbarAnimation != null)
mToolbarAnimation.cancel();
mToolbarAnimation = null;
mToolbar.setAlpha(0);
mToolbar.setVisibility(View.INVISIBLE);
} else if (mToolbarAnimation == null) {
mToolbar.setVisibility(View.VISIBLE);
mToolbar.setTranslationY(-mToolbar.getHeight() / 3);
mToolbarAnimation = mToolbar.animate().setDuration(getResources().getInteger(android.R.integer.config_longAnimTime));
mToolbarAnimation.alpha(1).translationY(0).start();
}
}
});
}
@Override
public ViewTransformer getViewTransformer() {
return new BaseViewTransformer() {
private ViewPropertyAnimator mBottomSheetBackgroundImageViewFadeInAnimation, mBottomSheetBackgroundImageViewFadeOutAnimation;
private Float mOriginalContactPhotoXCoordinate = null;
private final float mOriginalBottomSheetBackgroundImageViewTranslationY = mBottomSheetBackgroundImageView.getTranslationY();
@Override
public void transformView(final float translation, final float maxTranslation, final float peekedTranslation, final BottomSheetLayout parent, final View view) {
if (mOriginalContactPhotoXCoordinate == null)
mOriginalContactPhotoXCoordinate = movingIconImageView.getX();
if (translation < mBottomSheetHeight)
return;
if (translation == mBottomSheetHeight) {
if (mBottomSheetBackgroundImageViewFadeInAnimation != null)
mBottomSheetBackgroundImageViewFadeInAnimation.cancel();
mBottomSheetBackgroundImageViewFadeInAnimation = null;
if (mBottomSheetBackgroundImageViewFadeOutAnimation == null)
mBottomSheetBackgroundImageViewFadeOutAnimation = mBottomSheetBackgroundImageView.animate().alpha(0);
} else {
if (mBottomSheetBackgroundImageViewFadeOutAnimation != null)
mBottomSheetBackgroundImageViewFadeOutAnimation.cancel();
mBottomSheetBackgroundImageViewFadeOutAnimation = null;
if (mBottomSheetBackgroundImageViewFadeInAnimation == null) {
mBottomSheetBackgroundImageViewFadeInAnimation = mBottomSheetBackgroundImageView.animate().alpha(1);
}
}
float progress = (translation - mBottomSheetHeight) / (maxTranslation - mBottomSheetHeight);
//Log.d("AppLog", "translation:" + translation + " maxTranslation:" + maxTranslation + " progress:" + progress);
//movingIconImageView.setY(progress * (mBottomSheetHeight - movingIconImageView.getHeight()));
movingIconImageView.setY(progress * (mBottomSheetHeight - movingIconImageView.getHeight() - mMStartMarginBottom));
movingIconImageView.setX(mOriginalContactPhotoXCoordinate - progress * (mOriginalContactPhotoXCoordinate - mMStartMarginLeft));
//mBottomSheetBackgroundImageView.setAlpha(progress);
mBottomSheetBackgroundImageView.setTranslationY(mOriginalBottomSheetBackgroundImageViewTranslationY - progress * mOriginalBottomSheetBackgroundImageViewTranslationY);
}
};
}
}
这是我的 xml:-
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:id="@+id/main_content"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="@dimen/header_height"
android:background="@null">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="168dp"
android:layout_marginTop="40dp"
android:background="#eee">
</FrameLayout>
<ImageView
android:id="@+id/backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:translationY="40dp"
app:layout_collapseMode="parallax"/>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:theme="@style/ToolbarColoredBackArrow"/>
<ImageView
android:id="@+id/movingIconImageView"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_gravity="center_horizontal" android:background="#f00"
android:src="@drawable/test"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/window_color"
android:orientation="vertical"
android:paddingTop="24dp">
<include layout="@layout/junk_cardview"/>
<include layout="@layout/junk_cardview"/>
<include layout="@layout/junk_cardview"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
<!--<android.support.design.widget.FloatingActionButton-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:layout_margin="@dimen/fab_margin"-->
<!--android:clickable="true"-->
<!--android:src="@android:drawable/ic_menu_send"-->
<!--app:layout_anchor="@id/appbar"-->
<!--app:layout_anchorGravity="bottom|right|end"/>-->
我希望我的 backdrop 图像向上滑动，它只会随着 slide 淡出!
注意:在库示例中，我得到 ImageView alpha 从 0 到 1，但我想滑动我的 imageUp 而不仅仅是像 alpha 动画那样动画!
最佳答案
您发布的图片最初来自关于 design of the Google I/O app in 2014 的帖子。 .相应的图像显示了该 Action 在实践中的实际样子[右侧]:
如文章所述，此应用的来源是 made public on GitHub .我建议您查看该代码以获得答案。虽然目前可用的来源是 2015 版应用，而不是文章中提到的 2014 版。
关于android - Imageview 中的并行动画，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34326968/