Android 點擊View炫酷動畫

package view;

import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.animation.OvershootInterpolator;
import android.widget.ImageView;

import androidx.annotation.Nullable;

public class MyImageView extends ImageView {
    public MyImageView(Context context) {
        super(context);
 //        必須設置setClickable(true), 要不然像ImageView 默認是點擊不了的，它就收不到Action_Up 事件
//        如果一個view 的onTouchEvent 的Action_Down 返回false ，那麼view的 Action_Up 是不會執行的
        this.setClickable(true);
    }

    public MyImageView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        this.setClickable(true);
    }

    public MyImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.setClickable(true);
    }

    /**
     * 頂點判斷【0：中間】【1：上】【2：右】【3：下】【4：左】
     **/
    private int pivot = 0;

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
//                getX() 和 getY() 獲取的是距離自身的座標位置
                startAnimDown(event.getX(), event.getY());
                break;
            case MotionEvent.ACTION_UP:
                System.out.println("onTouchEvent :" + MotionEvent.ACTION_UP);
                endAnimal();
                break;

        }
        boolean b = super.onTouchEvent(event);
        System.out.println("boolean :" + b);
        return b;
    }
    /**
     * 頂點判斷【0：中間】【1：上】【2：右】【3：下】【4：左】
     **/
    public OvershootInterpolator interpolator = new OvershootInterpolator(3f);
    public void startAnimDown(float touchX, float touchY) {
//        獲取的是自身的相對座標位置
        System.out.println("touchX :" + touchX + " touchY :" + touchY);
        if (width / 5 * 2 < touchX && touchX < width / 5 * 3 && height / 5 * 2 < touchY && touchY < height / 5 * 3) {
//            代表中心位置
            pivot = 0;
        } else if (touchX < width / 2 && touchY < height / 2) {
            if (touchX > touchY) {
                pivot = 1;// 代表用戶點擊的上面
            }else {
                pivot = 4; // 代表用戶點擊的左邊
            }
        }else if (touchX < width / 2 && touchY > height / 2) {
            if (touchX < (height - touchY)) {//
                pivot = 4;// 代表用戶點擊左邊
            }else {
                pivot = 3; // 代表用戶點擊下面
            }
        }else if (touchX > width / 2 && touchY < height / 2){
            if (width - touchX < touchY) {//點擊右邊
                pivot = 2;// 點擊右邊
            }else {
                pivot = 1; // 代表用戶點擊上面
            }
        }else if (touchX > width / 2 && touchY > height / 2){
            if (width - touchX > height - touchY) {//點擊下面
                pivot = 3;//點擊下面
            }else {
                pivot = 2; // 代表用戶點擊右邊
            }
        }
//        上面這種算法只適合正方形的圖片
        String anim = "";
        System.out.println("pivot :" + pivot);
        switch (pivot){
            case 0:
                startCenterSmallAnimal();
                return;
            case 1:
            case 3:
                anim = "rotationX";
                break;
            case 2:
            case 4:
                anim="rotationY";
                break;
        }
//        設置動畫的基準點
        this.setPivotX(width/2);
        this.setPivotY(height/2);
//        【0：中間】【1：上】【2：右】【3：下】【4：左】
        if (pivot == 4 ){
            endRotationValue = -7f;
        }else if (pivot == 2){
            endRotationValue = 7f;
        }else if (pivot == 1){
            endRotationValue = 7f;
        }else if (pivot == 3){
            endRotationValue = -7f;
        }
        ObjectAnimator animObject = ObjectAnimator.ofFloat(this, anim, 0, endRotationValue)
                .setDuration(300);
        animObject.setInterpolator(interpolator);
        animObject.start();
    }

    private void startCenterSmallAnimal() {
        int tzStart = (int) this.getTranslationZ();
        this.setTag(tzStart);

        PropertyValuesHolder tz = PropertyValuesHolder.ofFloat("translationZ", tzStart, 0);
        PropertyValuesHolder tX = PropertyValuesHolder.ofFloat("scaleX", this.getScaleX(), 0.95f);
        PropertyValuesHolder tY = PropertyValuesHolder.ofFloat("scaleY", this.getScaleY(), 0.95f);
        ObjectAnimator objectAnimator = ObjectAnimator.ofPropertyValuesHolder(this,tz,tX,tY).setDuration(300);
        objectAnimator.setInterpolator(interpolator);
        objectAnimator.start();
    }
    private void startCenterBigAnimal() {
        int tzValue = (int) this.getTag();
        PropertyValuesHolder tz = PropertyValuesHolder.ofFloat("translationZ", 0, tzValue);
        PropertyValuesHolder tX = PropertyValuesHolder.ofFloat("scaleX", this.getScaleX(), 1f);
        PropertyValuesHolder tY = PropertyValuesHolder.ofFloat("scaleY", this.getScaleY(), 1f);
        ObjectAnimator objectAnimator = ObjectAnimator.ofPropertyValuesHolder(this,tz,tX,tY).setDuration(300);
        objectAnimator.setInterpolator(interpolator);
        objectAnimator.start();
    }

    //    結束動畫
    public void endAnimal(){
        String anim = "";
        switch (pivot){
            case 0:
                startCenterBigAnimal();
                return;
//            【0：中間】【1：上】【2：右】【3：下】【4：左】
            case 1:
            case 3:
                anim = "rotationX";
                break;
            case 2:
            case 4:
                anim = "rotationY";
                break;
        }
        System.out.println("pivotUp :" + pivot);
        if (pivot == 2 || pivot == 4){
            startRotationValue = (int) this.getRotationY();
        }else {
            startRotationValue = (int) this.getRotationX();
        }
        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(this,anim,startRotationValue,0);
        objectAnimator.setDuration(300);
        objectAnimator.setInterpolator(interpolator);
        objectAnimator.start();
    }
    float endRotationValue = 0;
    int startRotationValue = 0;

    //    當寬高發生變化時進行的回調
    int height;
    int width;

    //    System.out: touchX :552.0touchY :492.0
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        System.out.println("width :" + w + " oldWidth :" + oldw);
        System.out.println("height :" + h + " oldHeight :" + oldh);
        width = w;
        height = h;
    }
}

下面是座標位置
// 【0：中間】【1：上】【2：右】【3：下】【4：左】的算法和參考的算法不一樣
參考：https://blog.csdn.net/bamboy_/article/details/54342079