Ten przewodnik pokazuje, jak wdrożyć animację powiększania przez dotknięcie. Powiększanie przez dotknięcie pozwala aplikacjom takim jak galerii zdjęć, animuj widok z miniatury, aby wypełnił ekran.
Tak wygląda animacja kliknięcia przez dotknięcie po rozwinięciu miniatury w celu wypełnienia ekran:
Pełny przykład działania znajdziesz w klasie UIAnimation
z
WearSpeakerSample
projektu na GitHubie.
Tworzenie widoków
Utwórz plik układu zawierający małą i dużą wersję treści, którą chcesz powiększyć.
Ten przykład pozwala utworzyć
ImageButton
– element, który można kliknąć
i miniaturę obrazu
ImageView
, w której wyświetla się
powiększony obraz:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="16dp">
<ImageButton
android:id="@+id/thumb_button_1"
android:layout_width="100dp"
android:layout_height="75dp"
android:layout_marginRight="1dp"
android:src="@drawable/thumb1"
android:scaleType="centerCrop"
android:contentDescription="@string/description_image_1" />
</LinearLayout>
<!-- This initially hidden ImageView
holds the zoomed version of
the preceding images. Without transformations applied, it fills the entire
screen. To achieve the zoom animation, this view's bounds are animated
from the bounds of the preceding thumbnail button to its final laid-out
bounds.
-->
<ImageView
android:id="@+id/expanded_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="invisible"
android:contentDescription="@string/description_zoom_touch_close" />
</FrameLayout>
Skonfiguruj animację powiększenia
Po zastosowaniu układu skonfiguruj moduły obsługi zdarzeń, które będą uruchamiać animację powiększenia.
poniższy przykład dodaje atrybut
View.OnClickListener
do
ImageButton
uruchamiający animację powiększenia, gdy użytkownik kliknie przycisk obrazu:
Kotlin
class ZoomActivity : FragmentActivity() { // Hold a reference to the current animator so that it can be canceled // midway. private var currentAnimator: Animator? = null // The system "short" animation time duration in milliseconds. This duration // is ideal for subtle animations or animations that occur frequently. private var shortAnimationDuration: Int = 0 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_zoom) // Hook up taps on the thumbnail views. binding.thumbButton1.setOnClickListener { zoomImageFromThumb(thumb1View, R.drawable.image1) } // Retrieve and cache the system's default "short" animation time. shortAnimationDuration = resources.getInteger(android.R.integer.config_shortAnimTime) } ... }
Java
public class ZoomActivity extends FragmentActivity { // Hold a reference to the current animator so that it can be canceled // mid-way. private Animator currentAnimator; // The system "short" animation time duration in milliseconds. This duration // is ideal for subtle animations or animations that occur frequently. private int shortAnimationDuration; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_zoom); // Hook up taps on the thumbnail views. binding.thumbButton1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { zoomImageFromThumb(thumb1View, R.drawable.image1); } }); // Retrieve and cache the system's default "short" animation time. shortAnimationDuration = getResources().getInteger( android.R.integer.config_shortAnimTime); } ... }
Powiększ widok
W razie potrzeby przełączaj się z widoku o normalnej wielkości na widok powiększony. Ogólnie rzecz biorąc,
są animowane od granic widoku normalnego do granic większego widoku.
poniższych metod pokazują, jak wdrożyć animację powiększenia, która powoduje, że miniatura zostaje powiększona
widok. Aby to zrobić, przypisz obraz w wysokiej rozdzielczości do ukrytego „powiększonego obrazu” (powiększony)
ImageView
Dla uproszczenia przykład poniżej wczytuje duży zasób graficzny w wątku UI. Wczytaj ją w
oddzielny wątek, aby zapobiec blokowaniu w wątku UI, a następnie ustawić bitmapę w wątku UI.
Rozmiar bitmapy nie może być większy niż rozmiar ekranu. Następnie oblicz początkową i końcową wartość
końcowe granice dla szablonu ImageView
.
Kotlin
private fun zoomImageFromThumb(thumbView: View, imageResId: Int) { // If there's an animation in progress, cancel it immediately and // proceed with this one. currentAnimator?.cancel() // Load the high-resolution "zoomed-in" image. binding.expandedImage.setImageResource(imageResId) // Calculate the starting and ending bounds for the zoomed-in image. val startBoundsInt = Rect() val finalBoundsInt = Rect() val globalOffset = Point() // The start bounds are the global visible rectangle of the thumbnail, // and the final bounds are the global visible rectangle of the // container view. Set the container view's offset as the origin for the // bounds, since that's the origin for the positioning animation // properties (X, Y). thumbView.getGlobalVisibleRect(startBoundsInt) binding.container.getGlobalVisibleRect(finalBoundsInt, globalOffset) startBoundsInt.offset(-globalOffset.x, -globalOffset.y) finalBoundsInt.offset(-globalOffset.x, -globalOffset.y) val startBounds = RectF(startBoundsInt) val finalBounds = RectF(finalBoundsInt) // Using the "center crop" technique, adjust the start bounds to be the // same aspect ratio as the final bounds. This prevents unwanted // stretching during the animation. Calculate the start scaling factor. // The end scaling factor is always 1.0. val startScale: Float if ((finalBounds.width() / finalBounds.height() > startBounds.width() / startBounds.height())) { // Extend start bounds horizontally. startScale = startBounds.height() / finalBounds.height() val startWidth: Float = startScale * finalBounds.width() val deltaWidth: Float = (startWidth - startBounds.width()) / 2 startBounds.left -= deltaWidth.toInt() startBounds.right += deltaWidth.toInt() } else { // Extend start bounds vertically. startScale = startBounds.width() / finalBounds.width() val startHeight: Float = startScale * finalBounds.height() val deltaHeight: Float = (startHeight - startBounds.height()) / 2f startBounds.top -= deltaHeight.toInt() startBounds.bottom += deltaHeight.toInt() } // Hide the thumbnail and show the zoomed-in view. When the animation // begins, it positions the zoomed-in view in the place of the // thumbnail. thumbView.alpha = 0f animateZoomToLargeImage(startBounds, finalBounds, startScale) setDismissLargeImageAnimation(thumbView, startBounds, startScale) }
Java
private void zoomImageFromThumb(final View thumbView, int imageResId) { // If there's an animation in progress, cancel it immediately and // proceed with this one. if (currentAnimator != null) { currentAnimator.cancel(); } // Load the high-resolution "zoomed-in" image. binding.expandedImage.setImageResource(imageResId); // Calculate the starting and ending bounds for the zoomed-in image. final Rect startBounds = new Rect(); final Rect finalBounds = new Rect(); final Point globalOffset = new Point(); // The start bounds are the global visible rectangle of the thumbnail, // and the final bounds are the global visible rectangle of the // container view. Set the container view's offset as the origin for the // bounds, since that's the origin for the positioning animation // properties (X, Y). thumbView.getGlobalVisibleRect(startBounds); findViewById(R.id.container) .getGlobalVisibleRect(finalBounds, globalOffset); startBounds.offset(-globalOffset.x, -globalOffset.y); finalBounds.offset(-globalOffset.x, -globalOffset.y); // Using the "center crop" technique, adjust the start bounds to be the // same aspect ratio as the final bounds. This prevents unwanted // stretching during the animation. Calculate the start scaling factor. // The end scaling factor is always 1.0. float startScale; if ((float) finalBounds.width() / finalBounds.height() > (float) startBounds.width() / startBounds.height()) { // Extend start bounds horizontally. startScale = (float) startBounds.height() / finalBounds.height(); float startWidth = startScale * finalBounds.width(); float deltaWidth = (startWidth - startBounds.width()) / 2; startBounds.left -= deltaWidth; startBounds.right += deltaWidth; } else { // Extend start bounds vertically. startScale = (float) startBounds.width() / finalBounds.width(); float startHeight = startScale * finalBounds.height(); float deltaHeight = (startHeight - startBounds.height()) / 2; startBounds.top -= deltaHeight; startBounds.bottom += deltaHeight; } // Hide the thumbnail and show the zoomed-in view. When the animation // begins, it positions the zoomed-in view in the place of the // thumbnail. thumbView.setAlpha(0f); animateZoomToLargeImage(startBounds, finalBounds, startScale); setDismissLargeImageAnimation(thumbView, startBounds, startScale); }
Trzeba animować 4 pozycjonowanie i rozmiar
właściwości – X
,
Y
,
SCALE_X
,
oraz
SCALE_Y
– jednocześnie
od granic początkowych do końcowych. Dodaj te cztery animacje do elementu
AnimatorSet
aby zaczynały od tego samego czasu.
Kotlin
private fun animateZoomToLargeImage(startBounds: RectF, finalBounds: RectF, startScale: Float) { binding.expandedImage.visibility = View.VISIBLE // Set the pivot point for SCALE_X and SCALE_Y transformations to the // top-left corner of the zoomed-in view. The default is the center of // the view. binding.expandedImage.pivotX = 0f binding.expandedImage.pivotY = 0f // Construct and run the parallel animation of the four translation and // scale properties: X, Y, SCALE_X, and SCALE_Y. currentAnimator = AnimatorSet().apply { play( ObjectAnimator.ofFloat( binding.expandedImage, View.X, startBounds.left, finalBounds.left) ).apply { with(ObjectAnimator.ofFloat(binding.expandedImage, View.Y, startBounds.top, finalBounds.top)) with(ObjectAnimator.ofFloat(binding.expandedImage, View.SCALE_X, startScale, 1f)) with(ObjectAnimator.ofFloat(binding.expandedImage, View.SCALE_Y, startScale, 1f)) } duration = shortAnimationDuration.toLong() interpolator = DecelerateInterpolator() addListener(object : AnimatorListenerAdapter() { override fun onAnimationEnd(animation: Animator) { currentAnimator = null } override fun onAnimationCancel(animation: Animator) { currentAnimator = null } }) start() } }
Java
private void animateZoomToLargeImage(Rect startBounds, Rect finalBounds, Float startScale) { binding.expandedImage.setVisibility(View.VISIBLE); // Set the pivot point for SCALE_X and SCALE_Y transformations to the // top-left corner of the zoomed-in view. The default is the center of // the view. binding.expandedImage.setPivotX(0f); binding.expandedImage.setPivotY(0f); // Construct and run the parallel animation of the four translation and // scale properties: X, Y, SCALE_X, and SCALE_Y. AnimatorSet set = new AnimatorSet(); set .play(ObjectAnimator.ofFloat(binding.expandedImage, View.X, startBounds.left, finalBounds.left)) .with(ObjectAnimator.ofFloat(binding.expandedImage, View.Y, startBounds.top, finalBounds.top)) .with(ObjectAnimator.ofFloat(binding.expandedImage, View.SCALE_X, startScale, 1f)) .with(ObjectAnimator.ofFloat(binding.expandedImage, View.SCALE_Y, startScale, 1f)); set.setDuration(shortAnimationDuration); set.setInterpolator(new DecelerateInterpolator()); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { currentAnimator = null; } @Override public void onAnimationCancel(Animator animation) { currentAnimator = null; } }); set.start(); currentAnimator = set; }
Pomniejsz obraz, uruchamiając podobną animację odwrotnie, gdy użytkownik kliknie ekran.
został powiększony. Dodaj View.OnClickListener
do ImageView
. Po kliknięciu
ImageView
minimalizuje rozmiar miniatury obrazu i ustawia jego widoczność na
GONE
, aby go ukryć.
Kotlin
private fun setDismissLargeImageAnimation(thumbView: View, startBounds: RectF, startScale: Float) { // When the zoomed-in image is tapped, it zooms down to the original // bounds and shows the thumbnail instead of the expanded image. binding.expandedImage.setOnClickListener { currentAnimator?.cancel() // Animate the four positioning and sizing properties in parallel, // back to their original values. currentAnimator = AnimatorSet().apply { play(ObjectAnimator.ofFloat(binding.expandedImage, View.X, startBounds.left)).apply { with(ObjectAnimator.ofFloat(binding.expandedImage, View.Y, startBounds.top)) with(ObjectAnimator.ofFloat(binding.expandedImage, View.SCALE_X, startScale)) with(ObjectAnimator.ofFloat(binding.expandedImage, View.SCALE_Y, startScale)) } duration = shortAnimationDuration.toLong() interpolator = DecelerateInterpolator() addListener(object : AnimatorListenerAdapter() { override fun onAnimationEnd(animation: Animator) { thumbView.alpha = 1f binding.expandedImage.visibility = View.GONE currentAnimator = null } override fun onAnimationCancel(animation: Animator) { thumbView.alpha = 1f binding.expandedImage.visibility = View.GONE currentAnimator = null } }) start() } } }
Java
private void setDismissLargeImageAnimation(View thumbView, Rect startBounds, Float startScale) { // When the zoomed-in image is tapped, it zooms down to the original // bounds and shows the thumbnail instead of the expanded image. final float startScaleFinal = startScale; binding.expandedImage.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (currentAnimator != null) { currentAnimator.cancel(); } // Animate the four positioning and sizing properties in // parallel, back to their original values. AnimatorSet set = new AnimatorSet(); set.play(ObjectAnimator .ofFloat(binding.expandedImage, View.X, startBounds.left)) .with(ObjectAnimator .ofFloat(binding.expandedImage, View.Y,startBounds.top)) .with(ObjectAnimator .ofFloat(binding.expandedImage, View.SCALE_X, startScaleFinal)) .with(ObjectAnimator .ofFloat(binding.expandedImage, View.SCALE_Y, startScaleFinal)); set.setDuration(shortAnimationDuration); set.setInterpolator(new DecelerateInterpolator()); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { thumbView.setAlpha(1f); binding.expandedImage.setVisibility(View.GONE); currentAnimator = null; } @Override public void onAnimationCancel(Animator animation) { thumbView.setAlpha(1f); binding.expandedImage.setVisibility(View.GONE); currentAnimator = null; } }); set.start(); currentAnimator = set; } }); }