发现Boss直聘app做的还是，比较不错的吧。。先看效果，致谢 Image-Zoomer
GIF.gif
怎么用？
<pre>
@Override
public void onClick(View v) {
super.onClick(v);
if (R.id.tv == v.getId()) {
startActivity(ZoomActivity.class);
} else if (R.id.iv == v.getId()) {
new BossZoomHelper(this, imageView, 400);
}
}
</pre>
原理很简单，
<pre>
package org.alex.bosszoomanim;
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.support.v7.widget.ContentFrameLayout;
import android.view.View;
import android.view.animation.DecelerateInterpolator;
import android.widget.FrameLayout;
import android.widget.ImageView;
import org.alex.util.LogUtil;
/**
* 作者：Alex
* 时间：2016/10/8 12:48
* 简述：
*/
public class BossZoomHelper {
private Animator animator;
private ImageView copyImageView;
public BossZoomHelper(final Activity activity, final View originalView) {
this(activity, originalView, 400);
}
public BossZoomHelper(final Activity activity, final View originalView, final long duration) {
if (animator != null) {
animator.cancel();
}
final ContentFrameLayout container = (ContentFrameLayout) activity.findViewById(android.R.id.content);
copyImageView = new ImageView(activity);
int matchParent = FrameLayout.LayoutParams.MATCH_PARENT;
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(matchParent, matchParent);
copyImageView.setLayoutParams(params);
if (originalView instanceof ImageView) {
copyImageView.setImageDrawable(((ImageView) originalView).getDrawable());
} else {
Bitmap bm = view2Bitmap(originalView);
if (bm != null) {
copyImageView.setImageBitmap(bm);
}
}
copyImageView.setVisibility(View.GONE);
container.addView(copyImageView);
final Rect startRect = new Rect();
final Rect endRect = new Rect();
Point offsetPoint = new Point();
originalView.getGlobalVisibleRect(startRect);
/\*\*
\* r 是 绝对（global）坐标参数，包含状态栏、ActionBar、底部虚拟键
\* globalOffset 用于将global坐标转换成local坐标，这里的local坐标，是相对于内容区的坐标，也就是除了状态栏和action bar和虚拟按键的区域。
\* \*/
container.getGlobalVisibleRect(endRect, offsetPoint);
startRect.offset(-offsetPoint.x, -offsetPoint.y);
endRect.offset(-offsetPoint.x, -offsetPoint.y);
final float startScale;
float scaleSize;
float startScaleFinal;
LogUtil.e("-offsetPoint.x = " + (-offsetPoint.x) + " -offsetPoint.y = " + (-offsetPoint.y));
LogUtil.e("startRect.width() = " + startRect.width() + " startRect.height() = " + startRect.height());
LogUtil.e("endRect.width() = " + endRect.width() + " endRect.height() = " + endRect.height());
if ((float) endRect.width() / (float) endRect.height() > (float) startRect.width() / (float) startRect.height()) {
startScale = (float) startRect.height() / (float) endRect.height();
scaleSize = startScale \* (float) endRect.width();
startScaleFinal = (scaleSize - (float) startRect.width()) / 2.0F;
startRect.left = (int) ((float) startRect.left - startScaleFinal);
startRect.right = (int) ((float) startRect.right + startScaleFinal);
} else {
startScale = (float) startRect.width() / (float) endRect.width();
scaleSize = startScale \* (float) endRect.height();
startScaleFinal = (scaleSize - (float) startRect.height()) / 2.0F;
startRect.top = (int) ((float) startRect.top - startScaleFinal);
startRect.bottom = (int) ((float) startRect.bottom + startScaleFinal);
}
copyImageView.setPivotX(0.0F);
copyImageView.setPivotY(0.0F);
AnimatorSet showAnimatorSet = new AnimatorSet();
showAnimatorSet.setDuration(duration);
showAnimatorSet.play(ObjectAnimator.ofFloat(copyImageView, View.X, new float[]{(float) startRect.left, (float) endRect.left}))
.with(ObjectAnimator.ofFloat(copyImageView, View.Y, new float[]{(float) startRect.top, (float) endRect.top}))
.with(ObjectAnimator.ofFloat(copyImageView, View.SCALE_X, new float[]{startScale, 1.0F}))
.with(ObjectAnimator.ofFloat(copyImageView, View.SCALE_Y, new float[]{startScale, 1.0F}));
showAnimatorSet.setInterpolator(new DecelerateInterpolator());
showAnimatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
copyImageView.setVisibility(View.VISIBLE);
}
public void onAnimationEnd(Animator animation) {
animator = null;
}
public void onAnimationCancel(Animator animation) {
destroy(originalView, container);
}
});
showAnimatorSet.start();
animator = showAnimatorSet;
copyImageView.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
if (animator != null) {
animator.cancel();
}
copyImageView.setBackgroundColor(0);
AnimatorSet hiddenAnimatorSet = new AnimatorSet();
hiddenAnimatorSet.play(ObjectAnimator.ofFloat(copyImageView, View.X, new float[]{(float) startRect.left}))
.with(ObjectAnimator.ofFloat(copyImageView, View.Y, new float[]{(float) startRect.top}))
.with(ObjectAnimator.ofFloat(copyImageView, View.SCALE_X, new float[]{startScale}))
.with(ObjectAnimator.ofFloat(copyImageView, View.SCALE_Y, new float[]{startScale}));
hiddenAnimatorSet.setInterpolator(new DecelerateInterpolator());
hiddenAnimatorSet.setDuration(duration);
hiddenAnimatorSet.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
}
public void onAnimationEnd(Animator animation) {
if (animator != null) {
animator.cancel();
}
destroy(originalView, container);
}
public void onAnimationCancel(Animator animation) {
destroy(originalView, container);
}
});
hiddenAnimatorSet.start();
animator = hiddenAnimatorSet;
}
});
}
private void destroy(View originalView, ContentFrameLayout container) {
originalView.setAlpha(1.0F);
copyImageView.setVisibility(View.GONE);
container.removeView(copyImageView);
animator = null;
}
private Bitmap view2Bitmap(View view) {
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
Bitmap bmp = view.getDrawingCache();
if (bmp == null) {
return null;
}
Bitmap bp;
bp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight());
view.destroyDrawingCache();
return bp;
}
}
</pre>
