Android实现点击缩略图放大效果

概述本文实例为大家分享了Android点击缩略图放大效果的具体代码，供大家参考，具体内容如下

本文实例为大家分享了AndroID点击缩略图放大效果的具体代码，供大家参考，具体内容如下

import androID.animation.Animator;import androID.animation.AnimatorListenerAdapter;import androID.animation.AnimatorSet;import androID.animation.ObjectAnimator;import androID.graphics.Point;import androID.graphics.Rect;import androID.os.Bundle;import androID.support.v7.app.AppCompatActivity;import androID.vIEw.VIEw;import androID.vIEw.animation.DecelerateInterpolator;import androID.Widget.ImageVIEw;public class MainActivity extends AppCompatActivity {  // 持有这个动画的引用，让他可以在动画执行中途取消  private Animator mCurrentAnimator;  private int mShortAnimationDuration;  private VIEw imageVIEw1;  private VIEw imageVIEw2;  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    initVIEw();    imageVIEw1.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        zoomImageFromThumb(imageVIEw1,R.mipmap.ic_launcher);      }    });    imageVIEw2.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        zoomImageFromThumb(imageVIEw2,R.mipmap.ic_launcher);      }    });    // 系统默认的短动画执行时间 200    mShortAnimationDuration = getResources().getInteger(        androID.R.integer.config_shortAnimTime);  }  private voID initVIEw() {    imageVIEw1 = (ImageVIEw) findVIEwByID(R.ID.imageVIEw1);    imageVIEw2 = (ImageVIEw) findVIEwByID(R.ID.imageVIEw2);  }  private voID zoomImageFromThumb(final VIEw thumbVIEw,int imageResID) {    // 如果有动画正在运行，取消这个动画    if (mCurrentAnimator != null) {      mCurrentAnimator.cancel();    }    // 加载显示大图的ImageVIEw    final ImageVIEw expandedImageVIEw = (ImageVIEw) findVIEwByID(        R.ID.expanded_image);    expandedImageVIEw.setimageResource(imageResID);    // 计算初始小图的边界位置和最终大图的边界位置。    final Rect startBounds = new Rect();    final Rect finalBounds = new Rect();    final Point globalOffset = new Point();    // 小图的边界就是小ImageVIEw的边界，大图的边界因为是铺满全屏的，所以就是整个布局的边界。    // 然后根据偏移量得到正确的坐标。    thumbVIEw.getGlobalVisibleRect(startBounds);    findVIEwByID(R.ID.imageVIEw1).getGlobalVisibleRect(finalBounds,globalOffset);    startBounds.offset(-globalOffset.x,-globalOffset.y);    finalBounds.offset(-globalOffset.x,-globalOffset.y);    // 计算初始的缩放比例。最终的缩放比例为1。并调整缩放方向，使看着协调。    float startScale=0;    if ((float) finalBounds.wIDth() / finalBounds.height()        > (float) startBounds.wIDth() / startBounds.height()) {      // 横向缩放      float startWIDth = startScale * finalBounds.wIDth();      float deltaWIDth = (startWIDth - startBounds.wIDth()) / 2;      startBounds.left -= deltaWIDth;      startBounds.right += deltaWIDth;    } else {      // 竖向缩放      float startHeight = startScale * finalBounds.height();      float deltaHeight = (startHeight - startBounds.height()) / 2;      startBounds.top -= deltaHeight;      startBounds.bottom += deltaHeight;    }    // 隐藏小图，并显示大图    thumbVIEw.setAlpha(0f);    expandedImageVIEw.setVisibility(VIEw.VISIBLE);    // 将大图的缩放中心点移到左上角。默认是从中心缩放    expandedImageVIEw.setPivotX(0f);    expandedImageVIEw.setPivotY(0f);    //对大图进行缩放动画    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,1f));    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;    // 点击大图时，反向缩放大图，然后隐藏大图，显示小图。    final float startScaleFinal = startScale;    expandedImageVIEw.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw vIEw) {        if (mCurrentAnimator != null) {          mCurrentAnimator.cancel();        }        AnimatorSet set = new AnimatorSet();        set.play(ObjectAnimator            .offloat(expandedImageVIEw,startBounds.left))            .with(ObjectAnimator                .offloat(expandedImageVIEw,startBounds.top))            .with(ObjectAnimator                .offloat(expandedImageVIEw,startScaleFinal))            .with(ObjectAnimator                .offloat(expandedImageVIEw,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;      }    });  }}

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