BirdsProject/app/src/main/java/com/juhabi/birds/custom/CustomRefreshHeader.java

package com.juhabi.birds.custom;

import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.LinearInterpolator;
import android.widget.ImageView;
import android.widget.RelativeLayout;

import androidx.annotation.ColorInt;
import androidx.annotation.NonNull;

import com.juhabi.birds.R;
import com.scwang.smart.refresh.layout.api.RefreshHeader;
import com.scwang.smart.refresh.layout.api.RefreshKernel;
import com.scwang.smart.refresh.layout.api.RefreshLayout;
import com.scwang.smart.refresh.layout.constant.RefreshState;
import com.scwang.smart.refresh.layout.constant.SpinnerStyle;

/**
 * @author fengxiaoyang
 * @date 2025/7/11
 * @description TODO: 描述该类的作用
 */

public class CustomRefreshHeader extends RelativeLayout implements RefreshHeader {

    private ImageView ivRefresh;
    private ObjectAnimator rotateAnimator;
    // 用于 onMoving 中的动态效果
    private float mLastPercent = 0f;
    // 记录当前缩放值，避免重复设置
    private float mCurrentScale = 1f;

    public CustomRefreshHeader(Context context) {
        super(context);
        init(context);
    }

    public CustomRefreshHeader(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    private void init(Context context) {
        LayoutInflater.from(context).inflate(R.layout.view_refresh_header, this);
        ivRefresh = findViewById(R.id.ivRefresh);

        // 开启硬件加速，提升动画性能
        setLayerType(LAYER_TYPE_HARDWARE, null);

        // 初始化 ObjectAnimator
        rotateAnimator = ObjectAnimator.ofFloat(ivRefresh, "rotation", 0f, 360f);
        rotateAnimator.setDuration(1500);
        rotateAnimator.setRepeatCount(ValueAnimator.INFINITE);
        rotateAnimator.setInterpolator(new LinearInterpolator());
    }

    @NonNull
    @Override
    public View getView() {
        return this;
    }

    @SuppressLint("RestrictedApi")
    @Override
    public void onStartAnimator(@NonNull RefreshLayout layout, int height, int maxDragHeight) {
        if (rotateAnimator != null && !rotateAnimator.isRunning()) {
            rotateAnimator.start();
        }
    }

    @SuppressLint("RestrictedApi")
    @Override
    public int onFinish(@NonNull RefreshLayout layout, boolean success) {
        if (rotateAnimator != null && rotateAnimator.isRunning()) {
            rotateAnimator.setInterpolator(new DecelerateInterpolator());
            postDelayed(() -> {
                if (rotateAnimator != null) {
                    rotateAnimator.cancel();
                    rotateAnimator.setInterpolator(new LinearInterpolator());
                }
            }, 300);
        }
        // 动画过渡回正常大小
        animateToNormalScale();
        return 500;
    }

    /**
     * 平滑动画过渡回正常大小
     */
    private void animateToNormalScale() {
        if (ivRefresh == null) return;

        float startScale = mCurrentScale;
        ValueAnimator scaleAnimator = ValueAnimator.ofFloat(startScale, 1f);
        scaleAnimator.setDuration(300);
        scaleAnimator.setInterpolator(new DecelerateInterpolator());
        scaleAnimator.addUpdateListener(animation -> {
            float value = (float) animation.getAnimatedValue();
            ivRefresh.setScaleX(value);
            ivRefresh.setScaleY(value);
            mCurrentScale = value;
        });
        scaleAnimator.start();
    }

    // --- 必须实现的方法 ---

    @NonNull
    @Override
    public SpinnerStyle getSpinnerStyle() {
        return SpinnerStyle.Translate; // Header 跟随内容滑动
    }

    @Override
    public boolean isSupportHorizontalDrag() {
        return false;
    }

    @SuppressLint("RestrictedApi")
    @Override
    public void setPrimaryColors(@ColorInt int... colors) {}

    @SuppressLint("RestrictedApi")
    @Override
    public void onInitialized(@NonNull RefreshKernel kernel, int height, int maxDragHeight) {}

    @SuppressLint("RestrictedApi")
    @Override
    public void onMoving(boolean isDragging, float percent, int offset, int height, int maxDragHeight) {
        // 只在拖动过程中处理，避免过度计算
        if (percent != mLastPercent) {
            mLastPercent = percent;

            // 1. 动态缩放效果：从 0.5 放大到 1.2
            // 使用 clamp 限制范围：percent 0~1 -> scale 0.5~1.2
            float targetScale = 0.5f + (0.7f * Math.min(percent, 1.0f));
            if (Math.abs(targetScale - mCurrentScale) > 0.01f) {
                mCurrentScale = targetScale;
                ivRefresh.setScaleX(targetScale);
                ivRefresh.setScaleY(targetScale);
            }

            // 2. 透明度渐变效果（可选）
            // ivRefresh.setAlpha(Math.min(percent * 1.5f, 1.0f));
        }
    }

    @SuppressLint("RestrictedApi")
    @Override
    public void onReleased(@NonNull RefreshLayout layout, int height, int maxDragHeight) {}

    @SuppressLint("RestrictedApi")
    @Override
    public void onHorizontalDrag(float percentX, int offsetX, int offsetMax) {}

    @Override
    public boolean autoOpen(int duration, float dragRate, boolean animationOnly) {
        return false;
    }

    @SuppressLint("RestrictedApi")
    @Override
    public void onStateChanged(@NonNull RefreshLayout refreshLayout, @NonNull RefreshState oldState, @NonNull RefreshState newState) {
        // 状态切换时平滑恢复
        if (newState == RefreshState.PullDownCanceled) {
            // 用户取消下拉，恢复到初始状态
            animateToNormalScale();
        }
    }
}