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, startScale, 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, 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;
}
}
);
}
}