图片的放大缩小
图片的放大缩小
点击图片,放大,再点击图片缩小。
import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.AnimatorSet; import android.animation.ObjectAnimator; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.Point; import android.graphics.Rect; import android.view.View; import android.view.animation.DecelerateInterpolator; import android.widget.ImageView; public class ZoomUtil { private Animator mCurrentAnimator; private int mShortAnimationDuration; private Activity mActivity ; public ZoomUtil(Activity activity){ mActivity = activity ; mShortAnimationDuration = activity.getResources().getInteger(android.R.integer.config_shortAnimTime); } public void zoomImageFromThumb(final View thumbView, int imageResId) { // If there's an animation in progress, cancel it immediately and proceed with this one. if (mCurrentAnimator != null) { mCurrentAnimator.cancel(); } // Load the high-resolution "zoomed-in" image. final ImageView expandedImageView = (ImageView) mActivity.findViewById(R.id.expanded_image); expandedImageView.setImageResource(imageResId); // Calculate the starting and ending bounds for the zoomed-in image. This step // involves lots of math. Yay, math. 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. Also // 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); mActivity.findViewById(R.id.container).getGlobalVisibleRect(finalBounds, globalOffset); startBounds.offset(-globalOffset.x, -globalOffset.y); finalBounds.offset(-globalOffset.x, -globalOffset.y); finalBounds.top = -(globalOffset.y*3) ; // Adjust the start bounds to be the same aspect ratio as the final bounds using the // "center crop" technique. This prevents undesirable stretching during the animation. // Also 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 will position the zoomed-in view in the place of the thumbnail. thumbView.setAlpha(0f); expandedImageView.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). expandedImageView.setPivotX(0f); expandedImageView.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(expandedImageView, View.X, startBounds.left,finalBounds.left)) .with(ObjectAnimator.ofFloat(expandedImageView, View.Y, startBounds.top,finalBounds.top)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_X, startScale, 1f)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_Y, startScale, 1.5f)); set.setDuration(mShortAnimationDuration); set.setInterpolator(new DecelerateInterpolator()); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mCurrentAnimator = null; } @Override public void onAnimationCancel(Animator animation) { mCurrentAnimator = null; } }); set.start(); mCurrentAnimator = set; // Upon clicking the zoomed-in image, it should zoom back down to the original bounds // and show the thumbnail instead of the expanded image. final float startScaleFinal = startScale; expandedImageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (mCurrentAnimator != null) { mCurrentAnimator.cancel(); } // Animate the four positioning/sizing properties in parallel, back to their // original values. AnimatorSet set = new AnimatorSet(); set .play(ObjectAnimator.ofFloat(expandedImageView, View.X, startBounds.left)) .with(ObjectAnimator.ofFloat(expandedImageView, View.Y, startBounds.top)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_X, startScaleFinal)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_Y, startScaleFinal)); set.setDuration(mShortAnimationDuration); set.setInterpolator(new DecelerateInterpolator()); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { thumbView.setAlpha(1f); expandedImageView.setVisibility(View.GONE); mCurrentAnimator = null; } @Override public void onAnimationCancel(Animator animation) { thumbView.setAlpha(1f); expandedImageView.setVisibility(View.GONE); mCurrentAnimator = null; } }); set.start(); mCurrentAnimator = set; } }); } public void zoomImageFromThumb(final View thumbView, Bitmap bitmap) { // If there's an animation in progress, cancel it immediately and proceed with this one. if (mCurrentAnimator != null) { mCurrentAnimator.cancel(); } // Load the high-resolution "zoomed-in" image. final ImageView expandedImageView = (ImageView) mActivity.findViewById(R.id.expanded_image); expandedImageView.setImageBitmap(bitmap); // Calculate the starting and ending bounds for the zoomed-in image. This step // involves lots of math. Yay, math. 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. Also // 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); mActivity.findViewById(R.id.container).getGlobalVisibleRect(finalBounds, globalOffset); startBounds.offset(-globalOffset.x, -globalOffset.y); finalBounds.offset(-globalOffset.x, globalOffset.y); finalBounds.top = -(globalOffset.y*3) ; // Adjust the start bounds to be the same aspect ratio as the final bounds using the // "center crop" technique. This prevents undesirable stretching during the animation. // Also 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 will position the zoomed-in view in the place of the thumbnail. thumbView.setAlpha(0f); expandedImageView.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). expandedImageView.setPivotX(0f); expandedImageView.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(expandedImageView, View.X, startBounds.left,finalBounds.left)) .with(ObjectAnimator.ofFloat(expandedImageView, View.Y, startBounds.top,finalBounds.top)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_X, startScale, 1f)) .with(ObjectAnimator.ofFloat(expandedImageView, View.SCALE_Y, startScale, 1.5f)); set.setDuration(mShortAnimationDuration); set.setInterpolator(new DecelerateInterpolator()); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mCurrentAnimator = null; } @Override public void onAnimationCancel(Animator animation) { mCurrentAnimator = null; } }); set.start(); mCurrentAnimator = set; // Upon clicking the zoomed-in image, it should zoom back down to the original bounds // and show the thumbnail instead of the expanded image. final float startScaleFinal = startScale; expandedImageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (mCurrentAnimator != null) { mCurrentAnimator.cancel(); } // Animate the four positioning/sizing properties in parallel, back to their // original values. AnimatorSet set = new AnimatorSet(); set .play(ObjectAnimator.ofFloat(expandedImageView, View.X, startBounds.left)) .with(ObjectAnimator.ofFloat(expandedImageView, View.Y, startBounds.top)) .with(ObjectAnimator .ofFloat(expandedImageView, View.SCALE_X, startScaleFinal)) .with(ObjectAnimator .ofFloat(expandedImageView, View.SCALE_Y, startScaleFinal)); set.setDuration(mShortAnimationDuration); set.setInterpolator(new DecelerateInterpolator()); set.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { thumbView.setAlpha(1f); expandedImageView.setVisibility(View.GONE); mCurrentAnimator = null; } @Override public void onAnimationCancel(Animator animation) { thumbView.setAlpha(1f); expandedImageView.setVisibility(View.GONE); mCurrentAnimator = null; } }); set.start(); mCurrentAnimator = set; } }); } }
R.id.container 是最顶层的layout 容器。
<ImageView android:id="@+id/expanded_image" android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="gone" android:contentDescription="@string/image_contentDescription" />