您可以通过多种方式为磁贴设置动画，包括以下几种
显示扫描过渡
要显示从一个值到另一个值的平滑扫描，您可以为元素启用补间动画，如下面的代码片段所示
Kotlin
private val defaultValue = 0f
private var startValue = 15f
private var endValue = 105f
private val animationDurationInMillis = 2000f // 2 seconds
override fun onTileRequest(requestParams: TileRequest) =
Futures.immediateFuture(
// Add timeline and layout containers. CircularProgressIndicator is an
// inner element of those containers.
CircularProgressIndicator.Builder()
.setProgress(
FloatProp.Builder(/* static value */ 0.25f)
.setDynamicValue(
// Or you can use some other dynamic object, for example
// from the platform and then at the end of expression
// add animate().
DynamicFloat.animate(startValue, endValue,
AnimationSpec.Builder()
.setAnimationParameters(
AnimationParameters.Builder()
.setDurationMillis(animationDurationInMillis)
.build()
).build()
)
).build()
).build()
// Finish building all elements that contain CircularProgressIndicator.
)
Java
private float defaultValue = 0f;
private float startValue = 15f;
private float endValue = 105f;
private float animationDurationInMillis = 2000f; // 2 seconds
@Override
protected ListenableFuture<Tile> onTileRequest(
@NonNull TileRequest requestParams
) {
return Futures.immediateFuture(
// Add timeline and layout containers. CircularProgressIndicator is an
// inner element of those containers.
new CircularProgressIndicator.Builder()
.setProgress(
new FloatProp.Builder(/* static value */ 0.25f)
.setDynamicValue(
// Or you can use some other dynamic object, for example
// from the platform and then at the end of expression
// add animate().
DynamicFloat.animate(startValue, endValue,
new AnimationSpec.Builder()
.setAnimationParameters(
new AnimationParameters.Builder()
.setDurationMillis(animationDurationInMillis)
.build()
).build()
)
).build()
).build()
// Finish building all elements that contain CircularProgressIndicator.
);
}
设置弧线方向
如果您的磁贴包含弧线，您可能不希望弧线或文本始终沿用户所选语言的默认文本方向增长。要指定弧线增长方向，请使用ArcDirection API
Kotlin
@OptIn(ProtoLayoutExperimental::class)
public override fun onTileRequest(
requestParams: RequestBuilders.TileRequest
): ListenableFuture<Tile> {
return Futures.immediateFuture(Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
EdgeContentLayout.Builder(deviceParameters)
.setEdgeContent(
Arc.Builder()
// Arc should always grow clockwise.
.setArcDirection(LayoutElementBuilders.ARC_DIRECTION_CLOCKWISE)
.addContent(
ArcLine.Builder()
// Set color, length, thickness, and more.
// Arc should always grow clockwise.
.setArcDirection(
LayoutElementBuilders.ARC_DIRECTION_CLOCKWISE)
.build()
).build()
).build())
).build()
)
}
Java
@OptIn(markerClass = ProtoLayoutExperimental.class)
@NonNull
@Override
protected ListenableFuture<Tile> onTileRequest(
@NonNull RequestBuilders.TileRequest requestParams
) {
return Futures.immediateFuture(new Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
new EdgeContentLayout.Builder(deviceParameters)
.setEdgeContent(
new Arc.Builder()
// Arc should always grow clockwise.
.setArcDirection(LayoutElementBuilders.ARC_DIRECTION_CLOCKWISE)
.addContent(
new ArcLine.Builder()
// Set color, length, thickness, and more.
// Arc should always grow clockwise.
.setArcDirection(
LayoutElementBuilders.ARC_DIRECTION_CLOCKWISE)
.build())
.build())
.build()))
.build()
);
}
显示平滑淡入淡出或滑动
为了更清楚地表明磁贴中的元素正在出现或消失，或者更巧妙地显示磁贴值的变化，请在磁贴动画中使用淡入淡出和滑动效果。
如果磁贴布局包含值发生变化的元素，则磁贴会显示该元素的退出动画，然后更新布局并显示该元素的进入动画。
淡入淡出过渡
以下代码片段演示了如何使用DefaultContentTransitions中的辅助方法执行淡入和淡出过渡。要定义自定义FadeInTransition和FadeOutTransition对象，请分别在过渡设置器方法中调用setFadeIn()和setFadeOut()。
Kotlin
@OptIn(ProtoLayoutExperimental::class)
public override fun onTileRequest(
requestParams: RequestBuilders.TileRequest
): ListenableFuture<Tile> {
// Assumes that you've defined a custom helper method called
// getTileTextToShow().
val tileText = getTileTextToShow()
return Futures.immediateFuture(Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
Text.Builder(this, tileText)
.setModifiers(
ModifiersBuilders.Modifiers.Builder()
.setContentUpdateAnimation(AnimatedVisibility.Builder()
.setEnterTransition(
DefaultContentTransitions.fadeIn())
.setExitTransition(
DefaultContentTransitions.fadeOut()
).build())
).build())
).build()
)
}
Java
@OptIn(markerClass = ProtoLayoutExperimental.class)
@NonNull
@Override
protected ListenableFuture<Tile> onTileRequest(
@NonNull RequestBuilders.TileRequest requestParams
) {
// Assumes that you've defined a custom helper method called
// getTileTextToShow().
String tileText = getTileTextToShow();
return Futures.immediateFuture(new Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
new Text.Builder(this, tileText)
.setModifiers(
new ModifiersBuilders.Modifiers.Builder()
.setContentUpdateAnimation(new AnimatedVisibility.Builder()
.setEnterTransition(
DefaultContentTransitions.fadeIn())
.setExitTransition(
DefaultContentTransitions.fadeOut())
.build())
.build()))
.build()
);
}
滑动过渡
此其他代码片段演示了如何使用DefaultContentTransitions中的辅助方法执行滑动进入和滑动退出过渡。您还可以通过分别在过渡设置器方法中调用setSlideIn()和setSlideOut()来定义自定义SlideInTransition和SlideOutTransition对象。
Kotlin
@OptIn(ProtoLayoutExperimental::class)
public override fun onTileRequest(
requestParams: RequestBuilders.TileRequest
): ListenableFuture<Tile> {
// Assumes that you've defined a custom helper method called
// getTileTextToShow().
val tileText = getTileTextToShow()
return Futures.immediateFuture(Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
Text.Builder(this, tileText)
.setModifiers(
Modifiers.Builder()
.setContentUpdateAnimation(AnimatedVisibility.Builder()
.setEnterTransition(
DefaultContentTransitions.slideIn(
SLIDE_DIRECTION_LEFT_TO_RIGHT)
).setExitTransition(
DefaultContentTransitions.slideOut(
SLIDE_DIRECTION_LEFT_TO_RIGHT)
).build()
).build()
).build()
)).build()
)
}
Java
@OptIn(markerClass = ProtoLayoutExperimental.class)
@NonNull
@Override
protected ListenableFuture<Tile> onTileRequest(
@NonNull RequestBuilders.TileRequest requestParams
) {
// Assumes that you've defined a custom helper method called
// getTileTextToShow().
String tileText = getTileTextToShow();
return Futures.immediateFuture(Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
new Text.Builder(this, tileText)
.setModifiers(
new Modifiers.Builder()
.setContentUpdateAnimation(
new AnimatedVisibility.Builder()
.setEnterTransition(
DefaultContentTransitions.slideIn(
SLIDE_DIRECTION_LEFT_TO_RIGHT))
.setExitTransition(
DefaultContentTransitions.slideOut(
SLIDE_DIRECTION_LEFT_TO_RIGHT))
.build())
.build())
.build()))
.build()
);
}
显示转换
要引起对磁贴中特定元素或区域的注意，您可以对其应用多种类型的转换，包括：旋转、缩放和平移。
许多与转换相关的浮点值都接受动态表达式，这些表达式允许您为这些转换设置动画。
旋转
要围绕可自定义的枢轴点执行顺时针旋转，请使用类似于以下的代码
Kotlin
// Last line in your onTileRequest() method implementation.
return Futures.immediateFuture(Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
Text.Builder(this, someTileText)
.setModifiers(
ModifiersBuilders.Transformation.Builder()
// Set the pivot point 50 dp from the left edge
// and 100 dp from the top edge of the screen.
.setPivotX(dp(50))
.setPivotY(dp(100))
// Rotate the element 45 degrees clockwise.
.setRotation(
degrees(45f)
).build()
).build())
).build()
)
Java
// Last line in your onTileRequest() method implementation.
return Futres.immediateFuture(new Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
new Text.Builder(this, someTileText)
.setModifiers(
new ModifiersBuilders.Transformation.Builder()
// Set the pivot point 50 dp from the left edge
// and 100 dp from the top edge of the screen.
.setPivotX(dp(50))
.setPivotY(dp(100))
// Rotate the element 45 degrees clockwise.
.setRotation(
degrees(45f))
.build())
.build()))
.build()
);
缩放
要通过水平和垂直缩放因子来放大或缩小元素，请使用类似以下的代码
Kotlin
// Last line in your onTileRequest() method implementation.
return Futures.immediateFuture(Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
Text.Builder(this, someTileText)
.setModifiers(
ModifiersBuilders.Transformation.Builder()
// Set the pivot point 50 dp from the left edge
// and 100 dp from the top edge of the screen.
.setPivotX(dp(50))
.setPivotY(dp(100))
// Shrink the element by a scale factor
// of 0.5 horizontally and 0.75 vertically.
.setScaleX(TypeBuilders.FloatProp.Builder(0.5f)
.build())
.setScaleY(TypeBuilders.FloatProp.Builder(0.75f)
.build()
).build()
).build())
).build()
)
Java
// Last line in your onTileRequest() method implementation.
return Futres.immediateFuture(new Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
new Text.Builder(this, someTileText)
.setModifiers(
new ModifiersBuilders.Transformation.Builder()
// Set the pivot point 50 dp from the left edge
// and 100 dp from the top edge of the screen.
.setPivotX(dp(50))
.setPivotY(dp(100))
// Shrink the element by a scale factor
// of 0.5 horizontally and 0.75 vertically.
.setScaleX(new TypeBuilders.FloatProp.Builder(0.5f)
.build())
.setScaleY(new TypeBuilders.FloatProp.Builder(0.75f)
.build())
.build())
.build()))
.build()
);
几何变换
要将元素在屏幕上水平或垂直移动特定数量的密度像素 (dp)，请使用类似以下的代码
Kotlin
// Last line in your onTileRequest() method implementation.
return Futures.immediateFuture(Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
Text.Builder(this, someTileText)
.setModifiers(
ModifiersBuilders.Transformation.Builder()
// Translate (move) the element 60 dp to the right
// and 80 dp down.
.setTranslationX(dp(60))
.setTranslationY(dp(80))
.build()
).build())
).build()
)
Java
// Last line in your onTileRequest() method implementation.
return Futres.immediateFuture(new Tile.Builder()
.setResourcesVersion(RESOURCES_VERSION)
.setTileTimeline(Timeline.fromLayoutElement(
new Text.Builder(this, someTileText)
.setModifiers(
new ModifiersBuilders.Transformation.Builder()
// Translate (move) the element 60 dp to the right
// and 80 dp down.
.setTranslationX(dp(60))
.setTranslationY(dp(80))
.build())
.build()))
.build()
);
不要在动画过程中显示重要信息
动画在几种情况下会被禁用
- 系统的图块渲染可能会禁用所有图块的动画。
- 一个图块一次只能动画化 4 个元素。如果您尝试同时动画化超过 4 个元素，则并非所有元素都会显示动画。
在动画被禁用的情况下，元素处于静态状态并显示动画的结束值。因此，不要依赖动画的行为（例如其持续时间）来显示重要信息。