Android 自定义控件按钮滚动选择

深碍√TFBOYSˉ_ 2022-06-01 01:42 358阅读 0赞

# 效果图 #

![这里写图片描述][SouthEast]

# 代码实现 #

package com.demo.ui.view;
    
    import android.annotation.TargetApi;
    import android.content.Context;
    import android.os.Build;
    import android.os.Handler;
    import android.support.v4.content.ContextCompat;
    import android.view.Gravity;
    import android.view.MotionEvent;
    import android.view.View;
    import android.widget.ImageView;
    import android.widget.LinearLayout;
    import android.widget.RelativeLayout;
    import android.widget.TextView;
    
    import com.demo.R;
    import com.demo.factory.Axis;
    import com.demo.utils.LogUtils;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class AirTemperatureView extends RelativeLayout{
    
        private Context context;
        private TextView tv;
        private TextView tv_middle;
       // private TextView tv_middle_small;
        private  RelativeLayout Auto_layout;
        private StringScrollPicker stringScrollPicker;
        private List<CharSequence> newList;
        private ImageView img;
        private ImageView img_left;
        private ImageView img_right;
    
        private int mPosition;
        private Handler handler = new Handler();
        /** * 延迟线程，看是否还有下一个字符输入 */
        private Runnable delayRun = new Runnable() {
            @Override
            public void run() {
                stringScrollPicker.setVisibility(INVISIBLE);
                img.setBackgroundResource(R.drawable.air_temp_bg);
                tv_middle.setText(newList.get(mPosition));
                //tv.setText("电池剩余"+newList.get(mPosition)+"%提醒你");
                tv_middle.setVisibility(VISIBLE);
                img_right.setVisibility(VISIBLE);
                img_left.setVisibility(VISIBLE);
    
                if(mListener != null) {
                    mListener.setAirTemper(mPosition+18);
                }
                LogUtils.e("空调刷新===","温度");
    
            }
        };
    
        public AirTemperatureView(Context context){
            super(context);
            this.context = context;
            init();
        }
    
        @TargetApi(Build.VERSION_CODES.M)
        public void init(){
            super.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, Axis.scaleX(230)));
            LinearLayout parent = new LinearLayout(context);
            parent.setOrientation(LinearLayout.VERTICAL);
            LayoutParams parent_Params = new LayoutParams(LayoutParams.MATCH_PARENT, Axis.scaleX(230));
            super.addView(parent,parent_Params);
    
            RelativeLayout tv_layout = new RelativeLayout(context);
            LinearLayout.LayoutParams tv_layout_Params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, Axis.scaleX(50));
            parent.addView(tv_layout,tv_layout_Params);
            tv = new TextView(context);
            tv.setText("温度");
            tv.setTextSize(Axis.scaleTextSize(36));
            tv.setTextColor(ContextCompat.getColor(context, R.color.white_70_color));//
            LayoutParams tv_Params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            tv_Params.addRule(RelativeLayout.CENTER_IN_PARENT);
            tv_layout.addView(tv,tv_Params);
    
    
            /** * 滑动选择器 */
            Auto_layout = new RelativeLayout(context);
            LinearLayout.LayoutParams Auto_layout_Params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, Axis.scaleX(150));
            Auto_layout_Params.setMargins(0,Axis.scaleX(30),0,0);
            parent.addView(Auto_layout,Auto_layout_Params);
    
    
            img = new ImageView(context);
            img.setId(R.id.EleRemindImage);
            img.setBackgroundResource(R.drawable.air_temp_bg);
            LayoutParams img_Params = new LayoutParams(Axis.scaleX(150), Axis.scaleX(150));
            img_Params.addRule(RelativeLayout.CENTER_IN_PARENT);
            Auto_layout.addView(img,img_Params);
    
    
            img_left = new ImageView(context);
            img_left.setBackgroundResource(R.drawable.battery_point);
            LayoutParams img_left_Params = new LayoutParams(Axis.scaleX(14), Axis.scaleX(14));
            img_left_Params.addRule(RelativeLayout.CENTER_VERTICAL);
            img_left_Params.addRule(RelativeLayout.LEFT_OF,R.id.EleRemindImage);
            img_left_Params.setMargins(0,0,Axis.scaleX(134),0);
            Auto_layout.addView(img_left,img_left_Params);
    
    
            img_right = new ImageView(context);
            img_right.setBackgroundResource(R.drawable.battery_point);
            LayoutParams img_right_Params = new LayoutParams(Axis.scaleX(14), Axis.scaleX(14));
            img_right_Params.addRule(RelativeLayout.CENTER_VERTICAL);
            img_right_Params.addRule(RelativeLayout.RIGHT_OF,R.id.EleRemindImage);
            img_right_Params.setMargins(Axis.scaleX(134),0,0,0);
            Auto_layout.addView(img_right,img_right_Params);
    
    
    
            tv_middle = new TextView(context);
            tv_middle.setTextSize(Axis.scaleTextSize(64));
            tv_middle.setGravity(Gravity.CENTER);
            tv_middle.setTextColor(0xFFFFFFFF);
            LayoutParams tv_middle_Params = new LayoutParams(Axis.scaleX(150), Axis.scaleX(150));
            tv_middle_Params.addRule(RelativeLayout.CENTER_IN_PARENT);
            Auto_layout.addView(tv_middle,tv_middle_Params);
    
    
            newList = new ArrayList<>();
            newList.add("18");
            newList.add("19");
            newList.add("20");
            newList.add("21");
            newList.add("22");
            newList.add("23");
            newList.add("24");
            newList.add("25");
            newList.add("26");
            newList.add("27");
            newList.add("28");
            newList.add("29");
            newList.add("30");
            newList.add("31");
            newList.add("32");
    
    
            tv_middle.setText(newList.get(0));
    
            stringScrollPicker = new StringScrollPicker(context);
            stringScrollPicker.setHorizontal(true);
            stringScrollPicker.setVisibleItemCount(5);//可见5个 第3个 （3-1）个位中间
            stringScrollPicker.setCenterPosition(2);
            stringScrollPicker.setIsCirculation(true);
            stringScrollPicker.setCanTap(true);
            stringScrollPicker.setDisallowInterceptTouch(true);
            LayoutParams stringScrollPicker_Params = new LayoutParams(LayoutParams.MATCH_PARENT,Axis.scaleX(150));
            Auto_layout.addView(stringScrollPicker,stringScrollPicker_Params);
            stringScrollPicker.setData(newList);
            stringScrollPicker.setOnSelectedListener(new ScrollPickerView.OnSelectedListener() {
                @Override
                public void onSelected(ScrollPickerView scrollPickerView, final int position) {
                    mPosition = position;
                    handler.postDelayed(delayRun, 1500);
    
                }
            });
    
    
            stringScrollPicker.setOnSelectedListener(new StringScrollPicker.OnDataSelectedListener() {
                @Override
                public void DataSelected(CharSequence data) {
                    //tv.setText("电池剩余"+data+"%提醒你");
                }
            });
    
            stringScrollPicker.setSelectedPosition(0,false);//中间Item位置
    
            stringScrollPicker.setVisibility(INVISIBLE);
    
            stringScrollPicker.setOnTouchListener(new OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    switch (event.getAction()){
                        case MotionEvent.ACTION_DOWN:
                            img.setBackgroundResource(R.drawable.battery_btn_p);
                            if(delayRun!=null){
                                handler.removeCallbacks(delayRun);
                            }
                            break;
                    }
                    return false;
                }
            });
    
            img.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    stringScrollPicker.setVisibility(VISIBLE);
                    tv_middle.setVisibility(INVISIBLE);
                    img_right.setVisibility(INVISIBLE);
                    img_left.setVisibility(INVISIBLE);
                    img.setBackgroundResource(R.drawable.battery_btn_p);
    
                }
            });
        }
        /** * 风速设置 * @param mPosition */
        public  void  setAirTemperature(int mPosition){
            /** * 在设置的时候不刷新 */
            if(stringScrollPicker.getVisibility() == INVISIBLE){
                if(mPosition > 32){
                    mPosition = 32;
                }
                stringScrollPicker.setSelectedPosition(mPosition-18,false);
                tv_middle.setText(newList.get(mPosition-18));
            }
        }
    
        public TemperatureListener mListener;
        public void setOnTemperatureListener (TemperatureListener listener) {
            mListener = listener;
        }
        public interface TemperatureListener {
            void setAirTemper(int temperature);
        }
    
    }

StringScrollPicker 类

package com.demo.ui.view;
    
    import android.annotation.TargetApi;
    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.os.Build;
    import android.support.annotation.RequiresApi;
    import android.text.Layout;
    import android.text.StaticLayout;
    import android.text.TextPaint;
    import android.util.AttributeSet;
    import android.util.Log;
    
    import com.demo.factory.Axis;
    import com.demo.utils.ColorUtil;
    
    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.List;
    
    public class StringScrollPicker extends ScrollPickerView<CharSequence> {
    
    
        private int mMeasureWidth;
        private int mMeasureHeight;
    
        private TextPaint mPaint; //
        private int mMinTextSize = Axis.scaleX(64); // 最小的字体
        private int mMaxTextSize = Axis.scaleX(64); // 最大的字体
        // 字体渐变颜色
        private int mStartColor = Color.WHITE; // 中间选中ｉｔｅｍ的颜色
        private int mEndColor = Color.GRAY; // 上下两边的颜色
    
        private int mMaxLineWidth = -1; // 最大的行宽,默认为itemWidth.超过后文字自动换行
        private Layout.Alignment mAlignment = Layout.Alignment.ALIGN_CENTER; // 对齐方式,默认居中
    
        @TargetApi(Build.VERSION_CODES.CUPCAKE)
        public StringScrollPicker(Context context) {
            this(context, null);
        }
    
        @RequiresApi(api = Build.VERSION_CODES.CUPCAKE)
        public StringScrollPicker(Context context, AttributeSet attrs) {
            this(context, attrs, 0);
        }
    
        @RequiresApi(api = Build.VERSION_CODES.CUPCAKE)
        public StringScrollPicker(Context context, AttributeSet attrs,
                                  int defStyleAttr) {
            super(context, attrs, defStyleAttr);
    
            mPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
            mPaint.setStyle(Paint.Style.FILL);
            mPaint.setColor(Color.BLACK);
    
            setData(new ArrayList<CharSequence>(Arrays.asList(new String[]{
                    "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve"
            })));
    
        }
    
    
    
    
        /** * @param startColor 正中间的颜色 * @param endColor 上下两边的颜色 */
        public void setColor(int startColor, int endColor) {
            mStartColor = startColor;
            mEndColor = endColor;
            invalidate();
        }
    
        /** * item文字大小 * * @param minText 沒有被选中时的最小文字 * @param maxText 被选中时的最大文字 */
        public void setTextSize(int minText, int maxText) {
            mMinTextSize = minText;
            mMaxTextSize = maxText;
            invalidate();
        }
    
        public int getStartColor() {
            return mStartColor;
        }
    
        public int getEndColor() {
            return mEndColor;
        }
    
        public int getMinTextSize() {
            return mMinTextSize;
        }
    
        public int getMaxTextSize() {
            return mMaxTextSize;
        }
    
    
        public int getMaxLineWidth() {
            return mMaxLineWidth;
        }
    
        /** * 最大的行宽,默认为itemWidth.超过后文字自动换行 * @param maxLineWidth */
        public void setMaxLineWidth(int maxLineWidth) {
            mMaxLineWidth = maxLineWidth;
        }
    
        /** * 最大的行宽,默认为itemWidth.超过后文字自动换行 * @return */
        public Layout.Alignment getAlignment() {
            return mAlignment;
        }
    
        public void setAlignment(Layout.Alignment alignment) {
            mAlignment = alignment;
        }
    
        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w, h, oldw, oldh);
            mMeasureWidth = getMeasuredWidth();
            mMeasureHeight = getMeasuredHeight();
            if (mMaxLineWidth < 0) {
                mMaxLineWidth = getItemWidth();
            }
        }
    
        @Override
        public void drawItem(Canvas canvas, List<CharSequence> data, int position, int relative, float moveLength, float top) {
            CharSequence text = data.get(position);
            int itemSize = getItemSize();
    
            // 设置文字大小
            if (relative == -1) { // 上一个
                if (moveLength < 0) { // 向上滑动
                    mPaint.setTextSize(mMinTextSize);
                } else { // 向下滑动
                    mPaint.setTextSize(mMinTextSize + (mMaxTextSize - mMinTextSize)
                            * moveLength / itemSize);
                }
            } else if (relative == 0) { // 中间item,当前选中
                mPaint.setTextSize(mMinTextSize + (mMaxTextSize - mMinTextSize)
                        * (itemSize - Math.abs(moveLength)) / itemSize);
            } else if (relative == 1) { // 下一个
                if (moveLength > 0) { // 向下滑动
                    mPaint.setTextSize(mMinTextSize);
                } else { // 向上滑动
                    mPaint.setTextSize(mMinTextSize + (mMaxTextSize - mMinTextSize)
                            * -moveLength / itemSize);
                }
            } else { // 其他
                mPaint.setTextSize(mMinTextSize);
            }
    
            StaticLayout layout = new StaticLayout(text, 0, text.length(), mPaint, mMaxLineWidth, mAlignment, 1.0F, 0.0F, true, null, 0);
            float x = 0;
            float y = 0;
            float lineWidth = layout.getWidth();
    
            if (isHorizontal()) { // 水平滚动
                x = top + (getItemWidth() - lineWidth) / 2;
                y = (getItemHeight() - layout.getHeight()) / 2;
            } else { // 垂直滚动
                x = (getItemWidth() - lineWidth) / 2;
                y = top + (getItemHeight() - layout.getHeight()) / 2;
            }
            // 计算渐变颜色
            computeColor(relative, itemSize, moveLength,text);
    // canvas.drawText(text, x, y, mPaint);
    
            canvas.save();
            canvas.translate(x, y);
            layout.draw(canvas);
            canvas.restore();
        }
    
        /** * 计算字体颜色，渐变 * * @param relative 　相对中间item的位置 */
        private String lastString;
        private String nowSring;
        private void computeColor(int relative, int itemSize, float moveLength, CharSequence text) {
    
            int color = mEndColor; // 　其他默认为ｍEndColor
    
            if (relative == -1 || relative == 1) { // 上一个或下一个
                // 处理上一个item且向上滑动　或者　处理下一个item且向下滑动　，颜色为mEndColor
                if ((relative == -1 && moveLength < 0)
                        || (relative == 1 && moveLength > 0)) {
                    color = mEndColor;
                } else { // 计算渐变的颜色
                    float rate = (itemSize - Math.abs(moveLength))
                            / itemSize;
                    color = ColorUtil.computeGradientColor(mStartColor, mEndColor, rate);
                }
            } else if (relative == 0) { // 中间item
                float rate = Math.abs(moveLength) / itemSize;
                color = ColorUtil.computeGradientColor(mStartColor, mEndColor, rate);
    
                nowSring = text.toString();
                if(nowSring != lastString){
                    Log.e("text=====",text+"");
                    if(mListener != null){
                        mListener.DataSelected(text);
                    }
                }
                lastString = nowSring;
    
    
            }
    
            mPaint.setColor(color);
        }
    
        public interface OnDataSelectedListener {
            void DataSelected(CharSequence data);
        }
    
        public void setOnSelectedListener(OnDataSelectedListener listener) {
            mListener = listener;
        }
    
        public  OnDataSelectedListener mListener;
    
    }

ScrollPickerView 类

package com.demo.ui.view;
    
    
    import android.animation.Animator;
    import android.animation.AnimatorListenerAdapter;
    import android.animation.ValueAnimator;
    import android.annotation.TargetApi;
    import android.content.Context;
    import android.content.res.TypedArray;
    import android.graphics.Canvas;
    import android.graphics.Paint;
    import android.graphics.drawable.ColorDrawable;
    import android.graphics.drawable.Drawable;
    import android.os.Build;
    import android.support.annotation.RequiresApi;
    import android.util.AttributeSet;
    import android.util.DisplayMetrics;
    import android.view.GestureDetector;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.ViewParent;
    import android.view.animation.Interpolator;
    import android.widget.Scroller;
    
    import com.demo.R;
    import com.demo.utils.LogUtils;
    
    import java.util.ArrayList;
    import java.util.List;
    
    /** * 滚动选择器,带惯性滑动 */
    public abstract class ScrollPickerView<T> extends View {
    
    
        private int mVisibleItemCount = 3; // 可见的item数量
    
        private boolean mIsInertiaScroll = true; // 快速滑动时是否惯性滚动一段距离，默认开启
        private boolean mIsCirculation = true; // 是否循环滚动，默认开启
    
        /* 不允许父组件拦截触摸事件，设置为true为不允许拦截，此时该设置才生效 当嵌入到ScrollView等滚动组件中，为了使该自定义滚动选择器可以正常工作，请设置为true */
        private boolean mDisallowInterceptTouch = false;
    
        private int mSelected; // 当前选中的item下标
        private int mLastSelected; // 当前选中的item下标
    
        private List<T> mData;
        private int mItemHeight = 0; // 每个条目的高度,当垂直滚动时，高度=mMeasureHeight／mVisibleItemCount
        private int mItemWidth = 0; // 每个条目的宽度，当水平滚动时，宽度=mMeasureWidth／mVisibleItemCount
        private int mItemSize; // 当垂直滚动时，mItemSize = mItemHeight;水平滚动时，mItemSize = mItemWidth
        private int mCenterPosition = -1; // 中间item的位置，0<=mCenterPosition＜mVisibleItemCount，默认为 mVisibleItemCount / 2
        private int mCenterY; // 中间item的起始坐标y(不考虑偏移),当垂直滚动时，y= mCenterPosition*mItemHeight
        private int mCenterX; // 中间item的起始坐标x(不考虑偏移),当垂直滚动时，x = mCenterPosition*mItemWidth
        private int mCenterPoint; // 当垂直滚动时，mCenterPoint = mCenterY;水平滚动时，mCenterPoint = mCenterX
        private float mLastMoveY; // 触摸的坐标y
        private float mLastMoveX; // 触摸的坐标X
    
        private float mMoveLength = 0; // item移动长度，负数表示向上移动，正数表示向下移动
    
        private GestureDetector mGestureDetector;
        private OnSelectedListener mListener;
    
        private Scroller mScroller;
        private boolean mIsFling; // 是否正在惯性滑动
        private boolean mIsMovingCenter; // 是否正在滑向中间
        // 可以把scroller看做模拟的触屏滑动操作，mLastScrollY为上次触屏滑动的坐标
        private int mLastScrollY = 0; // Scroller的坐标y
        private int mLastScrollX = 0; // Scroller的坐标x
    
        private boolean mDisallowTouch = false; // 不允许触摸
    
        private Paint mPaint; //
        private Drawable mCenterItemBackground = null; // 中间选中item的背景色
    
        private boolean mCanTap = true; // 单击切换选项或触发点击监听器
    
        private boolean mIsHorizontal = false; // 是否水平滚动
    
        private boolean mDrawAllItem = false; // 是否绘制每个item(包括在边界外的item)
    
        @RequiresApi(api = Build.VERSION_CODES.CUPCAKE)
        public ScrollPickerView(Context context, AttributeSet attrs) {
            this(context, attrs, 0);
        }
    
        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        @RequiresApi(api = Build.VERSION_CODES.CUPCAKE)
        public ScrollPickerView(Context context, AttributeSet attrs,
                                int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            mGestureDetector = new GestureDetector(getContext(),
                    new FlingOnGestureListener());
            mScroller = new Scroller(getContext());
            mAutoScrollAnimator = ValueAnimator.ofInt(0, 0);
    
            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mPaint.setStyle(Paint.Style.FILL);
    
            init(attrs);
    
        }
    
        private void init(AttributeSet attrs) {
            if (attrs != null) {
                TypedArray typedArray = getContext().obtainStyledAttributes(attrs,
                        R.styleable.ScrollPickerView);
    
                if (typedArray.hasValue(R.styleable.ScrollPickerView_spv_center_item_background)) {
                    setCenterItemBackground(typedArray.getDrawable(R.styleable.ScrollPickerView_spv_center_item_background));
                }
                setVisibleItemCount(typedArray.getInt(
                        R.styleable.ScrollPickerView_spv_visible_item_count,
                        getVisibleItemCount()));
                setCenterPosition(typedArray.getInt(
                        R.styleable.ScrollPickerView_spv_center_item_position,
                        getCenterPosition()));
                setIsCirculation(typedArray.getBoolean(R.styleable.ScrollPickerView_spv_is_circulation, isIsCirculation()));
                setDisallowInterceptTouch(typedArray.getBoolean(R.styleable.ScrollPickerView_spv_disallow_intercept_touch, isDisallowInterceptTouch()));
                setHorizontal(typedArray.getInt(R.styleable.ScrollPickerView_spv_orientation, mIsHorizontal ? 1 : 2) == 1);
                typedArray.recycle();
            }
        }
    
    
        @Override
        protected void onDraw(Canvas canvas) {
    
            if (mData == null || mData.size() <= 0) {
                return;
            }
    
            // 选中item的背景色
            if (mCenterItemBackground != null) {
                mCenterItemBackground.draw(canvas);
            }
    
            // 只绘制可见的item
            int length = Math.max(mCenterPosition + 1, mVisibleItemCount - mCenterPosition);
            int position;
            int start = Math.min(length, mData.size());
            if (mDrawAllItem) {
                start = mData.size();
            }
            // 上下两边
            for (int i = start; i >= 1; i--) { // 先从远离中间位置的item绘制，当item内容偏大时，较近的item覆盖在较远的上面
    
                if (mDrawAllItem || i <= mCenterPosition + 1) {  // 上面的items,相对位置为 -i
                    position = mSelected - i < 0 ? mData.size() + mSelected - i
                            : mSelected - i;
                    // 传入位置信息，绘制item
                    if (mIsCirculation) {
                        drawItem(canvas, mData, position, -i, mMoveLength, mCenterPoint + mMoveLength - i * mItemSize);
                    } else if (mSelected - i >= 0) { // 非循环滚动
                        drawItem(canvas, mData, position, -i, mMoveLength, mCenterPoint + mMoveLength - i * mItemSize);
                    }
                }
                if (mDrawAllItem || i <= mVisibleItemCount - mCenterPosition) {  // 下面的items,相对位置为 i
                    position = mSelected + i >= mData.size() ? mSelected + i
                            - mData.size() : mSelected + i;
                    // 传入位置信息，绘制item
                    if (mIsCirculation) {
                        drawItem(canvas, mData, position, i, mMoveLength, mCenterPoint + mMoveLength + i * mItemSize);
                    } else if (mSelected + i < mData.size()) { // 非循环滚动
                        drawItem(canvas, mData, position, i, mMoveLength, mCenterPoint + mMoveLength + i * mItemSize);
                    }
                }
            }
            // 选中的item
            drawItem(canvas, mData, mSelected, 0, mMoveLength, mCenterPoint + mMoveLength);
        }
    
        /** * 绘制item * * @param canvas * @param data 　数据集 * @param position 在data数据集中的位置 * @param relative 相对中间item的位置,relative==0表示中间item,relative<0表示上（左）边的item,relative>0表示下(右)边的item * @param moveLength 中间item滚动的距离，moveLength<0则表示向上（右）滚动的距离，moveLength＞0则表示向下（左）滚动的距离 * @param top 当前绘制item的坐标,当垂直滚动时为顶部y的坐标；当水平滚动时为item最左边x的坐标 */
        public abstract void drawItem(Canvas canvas, List<T> data, int position, int relative, float moveLength, float top);
    
        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    
        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w, h, oldw, oldh);
            reset();
        }
    
        private void reset() {
            if (mCenterPosition < 0) {
                mCenterPosition = mVisibleItemCount / 2;
            }
    
            if (mIsHorizontal) {
                mItemHeight = getMeasuredHeight();
                mItemWidth = getMeasuredWidth() / mVisibleItemCount;
    
                mCenterY = 0;
                mCenterX = mCenterPosition * mItemWidth;
    
                mItemSize = mItemWidth;
                mCenterPoint = mCenterX;
            } else {
                mItemHeight = getMeasuredHeight() / mVisibleItemCount;
                mItemWidth = getMeasuredWidth();
    
                mCenterY = mCenterPosition * mItemHeight;
                mCenterX = 0;
    
                mItemSize = mItemHeight;
                mCenterPoint = mCenterY;
            }
    
            if (mCenterItemBackground != null) {
                mCenterItemBackground.setBounds(mCenterX, mCenterY, mCenterX + mItemWidth, mCenterY + mItemHeight);
            }
    
        }
    
        @RequiresApi(api = Build.VERSION_CODES.FROYO)
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            if (mDisallowTouch) { // 不允许触摸
                return true;
            }
    
            if (mGestureDetector.onTouchEvent(event)) {
                return true;
            }
    
            switch (event.getActionMasked()) {
                case MotionEvent.ACTION_MOVE:
    
                    if (mIsHorizontal) {
                        if (Math.abs(event.getX() - mLastMoveX) < 0.1f) {
                            return true;
                        }
                        mMoveLength += event.getX() - mLastMoveX;
                    } else {
                        if (Math.abs(event.getY() - mLastMoveY) < 0.1f) {
                            return true;
                        }
                        mMoveLength += event.getY() - mLastMoveY;
                    }
                    mLastMoveY = event.getY();
                    mLastMoveX = event.getX();
                    checkCirculation();
                    invalidate();
                    break;
                case MotionEvent.ACTION_UP:
                    mLastMoveY = event.getY();
                    mLastMoveX = event.getX();
                    moveToCenter();
                    break;
            }
            return true;
        }
    
    
        /** * @param curr * @param end */
        private void computeScroll(int curr, int end, float rate) {
            if (rate < 1) { // 正在滚动
                if (mIsHorizontal) {
                    // 可以把scroller看做模拟的触屏滑动操作，mLastScrollX为上次滑动的坐标
                    mMoveLength = mMoveLength + curr - mLastScrollX;
                    mLastScrollX = curr;
                } else {
                    // 可以把scroller看做模拟的触屏滑动操作，mLastScrollY为上次滑动的坐标
                    mMoveLength = mMoveLength + curr - mLastScrollY;
                    mLastScrollY = curr;
                }
                checkCirculation();
                invalidate();
            } else { // 滚动完毕
                mIsMovingCenter = false;
                mLastScrollY = 0;
                mLastScrollX = 0;
    
                // 直接居中，不通过动画
                if (mMoveLength > 0) { //// 向下滑动
                    if (mMoveLength < mItemSize / 2) {
                        mMoveLength = 0;
                    } else {
                        mMoveLength = mItemSize;
                    }
                } else {
                    if (-mMoveLength < mItemSize / 2) {
                        mMoveLength = 0;
                    } else {
                        mMoveLength = -mItemSize;
                    }
                }
                checkCirculation();
                mMoveLength = 0;
                mLastScrollY = 0;
                mLastScrollX = 0;
                notifySelected(true);
                invalidate();
            }
    
        }
    
        @Override
        public void computeScroll() {
            if (mScroller.computeScrollOffset()) { // 正在滚动
                if (mIsHorizontal) {
                    // 可以把scroller看做模拟的触屏滑动操作，mLastScrollX为上次滑动的坐标
                    mMoveLength = mMoveLength + mScroller.getCurrX() - mLastScrollX;
                } else {
                    // 可以把scroller看做模拟的触屏滑动操作，mLastScrollY为上次滑动的坐标
                    mMoveLength = mMoveLength + mScroller.getCurrY() - mLastScrollY;
                }
                mLastScrollY = mScroller.getCurrY();
                mLastScrollX = mScroller.getCurrX();
                checkCirculation(); //　检测当前选中的item
                invalidate();
            } else { // 滚动完毕
                if (mIsFling) {
                    mIsFling = false;
                    moveToCenter(); // 滚动到中间位置
                } else if (mIsMovingCenter) { // 选择完成，回调给监听器
                    mMoveLength = 0;
                    mIsMovingCenter = false;
                    mLastScrollY = 0;
                    mLastScrollX = 0;
                    notifySelected(true);
                }
            }
        }
    
        public void cancelScroll() {
            mLastScrollY = 0;
            mLastScrollX = 0;
            mIsFling = mIsMovingCenter = false;
            mScroller.abortAnimation();
            stopAutoScroll();
        }
    
        // 检测当前选择的item位置
        private void checkCirculation() {
            if (mMoveLength >= mItemSize) { // 向下滑动
                // 该次滚动距离中越过的item数量
                int span = (int) (mMoveLength / mItemSize);
                mSelected -= span;
                if (mSelected < 0) {  // 滚动顶部，判断是否循环滚动
                    if (mIsCirculation) {
                        do {
                            mSelected = mData.size() + mSelected;
                        } while (mSelected < 0); // 当越过的item数量超过一圈时
                        mMoveLength = (mMoveLength - mItemSize) % mItemSize;
                    } else { // 非循环滚动
                        mSelected = 0;
                        mMoveLength = mItemSize;
                        if (mIsFling) { // 停止惯性滑动，根据computeScroll()中的逻辑，下一步将调用moveToCenter()
                            mScroller.forceFinished(true);
                        }
                        if (mIsMovingCenter) { // 移回中间位置
                            scroll(mMoveLength, 0);
                        }
                    }
                } else {
                    mMoveLength = (mMoveLength - mItemSize) % mItemSize;
                }
    
            } else if (mMoveLength <= -mItemSize) { // 向上滑动
                // 该次滚动距离中越过的item数量
                int span = (int) (-mMoveLength / mItemSize);
                mSelected += span;
                if (mSelected >= mData.size()) { // 滚动末尾，判断是否循环滚动
                    if (mIsCirculation) {
                        do {
                            mSelected = mSelected - mData.size();
                        } while (mSelected >= mData.size()); // 当越过的item数量超过一圈时
                        mMoveLength = (mMoveLength + mItemSize) % mItemSize;
                    } else { // 非循环滚动
                        mSelected = mData.size() - 1;
                        mMoveLength = -mItemSize;
                        if (mIsFling) { // 停止惯性滑动，根据computeScroll()中的逻辑，下一步将调用moveToCenter()
                            mScroller.forceFinished(true);
                        }
                        if (mIsMovingCenter) { // 移回中间位置
                            scroll(mMoveLength, 0);
                        }
                    }
                } else {
                    mMoveLength = (mMoveLength + mItemSize) % mItemSize;
                }
            }
        }
    
        // 移动到中间位置
        private void moveToCenter() {
    
            if (!mScroller.isFinished() || mIsFling || mMoveLength == 0) {
                return;
            }
            cancelScroll();
    
            // 向下滑动
            if (mMoveLength > 0) {
                if (mIsHorizontal) {
                    if (mMoveLength < mItemWidth / 2) {
                        scroll(mMoveLength, 0);
                    } else {
                        scroll(mMoveLength, mItemWidth);
                    }
                } else {
                    if (mMoveLength < mItemHeight / 2) {
                        scroll(mMoveLength, 0);
                    } else {
                        scroll(mMoveLength, mItemHeight);
                    }
                }
            } else {
                if (mIsHorizontal) {
                    if (-mMoveLength < mItemWidth / 2) {
                        scroll(mMoveLength, 0);
                    } else {
                        scroll(mMoveLength, -mItemWidth);
                    }
                } else {
                    if (-mMoveLength < mItemHeight / 2) {
                        scroll(mMoveLength, 0);
                    } else {
                        scroll(mMoveLength, -mItemHeight);
                    }
                }
            }
        }
    
        // 平滑滚动
        private void scroll(float from, int to) {
            if (mIsHorizontal) {
                mLastScrollX = (int) from;
                mIsMovingCenter = true;
                mScroller.startScroll((int) from, 0, 0, 0);
                mScroller.setFinalX(to);
            } else {
                mLastScrollY = (int) from;
                mIsMovingCenter = true;
                mScroller.startScroll(0, (int) from, 0, 0);
                mScroller.setFinalY(to);
            }
            invalidate();
        }
    
        // 惯性滑动，
        private void fling(float from, float vel) {
            if (mIsHorizontal) {
                mLastScrollX = (int) from;
                mIsFling = true;
                // 最多可以惯性滑动10个item
                mScroller.fling((int) from, 0, (int) vel, 0, -10 * mItemWidth,
                        10 * mItemWidth, 0, 0);
            } else {
                mLastScrollY = (int) from;
                mIsFling = true;
                // 最多可以惯性滑动10个item
                mScroller.fling(0, (int) from, 0, (int) vel, 0, 0, -10 * mItemHeight,
                        10 * mItemHeight);
            }
            invalidate();
        }
    
        private void notifySelected(final boolean trigger) {
            if (mListener != null) {
                // 告诉监听器选择完毕
                post(new Runnable() {
                    @Override
                    public void run() {
                        if(mLastSelected != mSelected){
                            if(trigger){
                                mListener.onSelected(ScrollPickerView.this, mSelected);
                            }
    
                        }
                        mLastSelected = mSelected;
                    }
                });
            }
        }
    
        private boolean mIsAutoScrolling = false;
        private ValueAnimator mAutoScrollAnimator;
        private final static SlotInterpolator sAutoScrollInterpolator = new SlotInterpolator();
    
        /** * 自动滚动(必须设置为可循环滚动) * * @param position * @param duration * @param speed 每毫秒移动的像素点 */
        @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB)
        public void autoScrollFast(final int position, long duration, float speed, final Interpolator interpolator) {
            if (mIsAutoScrolling || !mIsCirculation) {
                return;
            }
            cancelScroll();
            mIsAutoScrolling = true;
    
    
            int length = (int) (speed * duration);
            int circle = (int) (length * 1f / (mData.size() * mItemSize) + 0.5f); // 圈数
            circle = circle <= 0 ? 1 : circle;
    
            int aPlan = circle * (mData.size()) * mItemSize + (mSelected - position) * mItemSize;
            int bPlan = aPlan + (mData.size()) * mItemSize; // 多一圈
            // 让其尽量接近length
            final int end = Math.abs(length - aPlan) < Math.abs(length - bPlan) ? aPlan : bPlan;
    
            mAutoScrollAnimator.cancel();
            mAutoScrollAnimator.setIntValues(0, end);
            mAutoScrollAnimator.setInterpolator(interpolator);
            mAutoScrollAnimator.setDuration(duration);
            mAutoScrollAnimator.removeAllUpdateListeners();
            if (end != 0) { // itemHeight为0导致endy=0
                mAutoScrollAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                    @Override
                    public void onAnimationUpdate(ValueAnimator animation) {
                        float rate = 0;
                        rate = animation.getCurrentPlayTime() * 1f / animation.getDuration();
                        computeScroll((int) animation.getAnimatedValue(), end, rate);
                    }
                });
                mAutoScrollAnimator.removeAllListeners();
                mAutoScrollAnimator.addListener(new AnimatorListenerAdapter() {
                    @Override
                    public void onAnimationEnd(Animator animation) {
                        super.onAnimationEnd(animation);
                        mIsAutoScrolling = false;
                    }
                });
                mAutoScrollAnimator.start();
            } else {
                computeScroll(end, end, 1);
                mIsAutoScrolling = false;
            }
        }
    
        /** * 自动滚动，默认速度为 0.6dp/ms * * @see ScrollPickerView#autoScrollFast(int, long, float, Interpolator) */
        @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB)
        public void autoScrollFast(final int position, long duration) {
            float speed = dip2px(0.6f);
            autoScrollFast(position, duration, speed, sAutoScrollInterpolator);
        }
    
        /** * 自动滚动 * * @see ScrollPickerView#autoScrollFast(int, long, float, Interpolator) */
        @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB)
        public void autoScrollFast(final int position, long duration, float speed) {
            autoScrollFast(position, duration, speed, sAutoScrollInterpolator);
        }
    
        /** * 滚动到指定位置 * * @param toPosition 　需要滚动到的位置 * @param duration 　滚动时间 * @param interpolator */
        @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB)
        public void autoScrollToPosition(int toPosition, long duration, final Interpolator interpolator) {
            toPosition = toPosition % mData.size();
            final int endY = (mSelected - toPosition) * mItemHeight;
            autoScrollTo(endY, duration, interpolator, false);
        }
    
        /** * @param endY 　需要滚动到的位置 * @param duration 　滚动时间 * @param interpolator * @param canIntercept 能否终止滚动，比如触摸屏幕终止滚动 */
        @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB)
        public void autoScrollTo(final int endY, long duration, final Interpolator interpolator, boolean canIntercept) {
            if (mIsAutoScrolling) {
                return;
            }
            final boolean temp = mDisallowTouch;
            mDisallowTouch = !canIntercept;
            mIsAutoScrolling = true;
            mAutoScrollAnimator.cancel();
            mAutoScrollAnimator.setIntValues(0, endY);
            mAutoScrollAnimator.setInterpolator(interpolator);
            mAutoScrollAnimator.setDuration(duration);
            mAutoScrollAnimator.removeAllUpdateListeners();
            mAutoScrollAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    float rate = 0;
                    rate = animation.getCurrentPlayTime() * 1f / animation.getDuration();
                    computeScroll((int) animation.getAnimatedValue(), endY, rate);
                }
            });
            mAutoScrollAnimator.removeAllListeners();
            mAutoScrollAnimator.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    super.onAnimationEnd(animation);
                    mIsAutoScrolling = false;
                    mDisallowTouch = temp;
                }
            });
            mAutoScrollAnimator.start();
        }
    
    
        /** * 停止自动滚动 */
        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        public void stopAutoScroll() {
            mIsAutoScrolling = false;
            mAutoScrollAnimator.cancel();
        }
    
        private static class SlotInterpolator implements Interpolator {
            @Override
            public float getInterpolation(float input) {
                return (float) (Math.cos((input + 1) * Math.PI) / 2.0f) + 0.5f;
            }
        }
    
    
        /** * 快速滑动时，惯性滑动一段距离 * * @author huangziwei */
        private class FlingOnGestureListener extends GestureDetector.SimpleOnGestureListener {
    
            private boolean mIsScrollingLastTime = false;
    
            public boolean onDown(MotionEvent e) {
                if (mDisallowInterceptTouch) {  // 不允许父组件拦截事件
                    ViewParent parent = getParent();
                    if (parent != null) {
                        parent.requestDisallowInterceptTouchEvent(true);
                    }
                }
                mIsScrollingLastTime = isScrolling(); // 记录是否从滚动状态终止
                // 点击时取消所有滚动效果
                cancelScroll();
                mLastMoveY = e.getY();
                mLastMoveX = e.getX();
                return true;
            }
    
            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                                   final float velocityY) {
                // 惯性滑动
                if (mIsInertiaScroll) {
                    cancelScroll();
                    if (mIsHorizontal) {
                        fling(mMoveLength, velocityX);
                    } else {
                        fling(mMoveLength, velocityY);
                    }
                }
                return true;
            }
    
            @RequiresApi(api = Build.VERSION_CODES.HONEYCOMB)
            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                mLastMoveY = e.getY();
                mLastMoveX = e.getX();
                float lastMove = 0;
    
                if (isHorizontal()) {
                    mCenterPoint = mCenterX;
                    lastMove = mLastMoveX;
                    LogUtils.e("lastMove===",lastMove+"");
                    LogUtils.e("mCenterPoint===",mCenterPoint+"");
    
                } else {
                    mCenterPoint = mCenterY;
                    lastMove = mLastMoveY;
                }
                if (mCanTap && !isScrolling() && !mIsScrollingLastTime) {
                    if (lastMove >= mCenterPoint && lastMove <= mCenterPoint + mItemSize) {
                        //performClick();
                    } else if (lastMove < mCenterPoint) {
                        int bs = (int)((mCenterPoint+mItemSize) - lastMove)/mItemSize;
                        int move = bs*mItemSize;
                        autoScrollTo(move, 150, sAutoScrollInterpolator, false);
                    } else if (lastMove > mCenterPoint + mItemSize) {
                        int bs = (int)((lastMove -mCenterPoint)/mItemWidth);
                        int move = -bs*mItemSize;
                        autoScrollTo(move, 150, sAutoScrollInterpolator, false);
                    } else {
                        moveToCenter();
                    }
                } else {
                    moveToCenter();
                }
                return true;
            }
        }
    
        public List<T> getData() {
            return mData;
        }
    
        public void setData(List<T> data) {
            if (data == null) {
                mData = new ArrayList<T>();
            } else {
                this.mData = data;
            }
            mSelected = mData.size() / 2;
            invalidate();
        }
    
    
        public T getSelectedItem() {
            return mData.get(mSelected);
        }
    
        public int getSelectedPosition() {
            return mSelected;
        }
    
        public void setSelectedPosition(int position,boolean trigger) {
            if (position < 0 || position > mData.size() - 1
                    || position == mSelected) {
                return;
            }
            mSelected = position;
            invalidate();
            if (mListener != null) {
                notifySelected(trigger);
            }
        }
    
        public void setOnSelectedListener(OnSelectedListener listener) {
            mListener = listener;
        }
    
        public OnSelectedListener getListener() {
            return mListener;
        }
    
        public boolean isInertiaScroll() {
            return mIsInertiaScroll;
        }
    
        public void setInertiaScroll(boolean inertiaScroll) {
            this.mIsInertiaScroll = inertiaScroll;
        }
    
        public boolean isIsCirculation() {
            return mIsCirculation;
        }
    
        public void setIsCirculation(boolean isCirculation) {
            this.mIsCirculation = false;
        }
    
        public boolean isDisallowInterceptTouch() {
            return mDisallowInterceptTouch;
        }
    
        public int getVisibleItemCount() {
            return mVisibleItemCount;
        }
    
        public void setVisibleItemCount(int visibleItemCount) {
            mVisibleItemCount = visibleItemCount;
            reset();
            invalidate();
        }
    
        /** * 是否允许父元素拦截事件，设置true后可以保证在ScrollView下正常滚动 */
        public void setDisallowInterceptTouch(boolean disallowInterceptTouch) {
            mDisallowInterceptTouch = disallowInterceptTouch;
        }
    
        public int getItemHeight() {
            return mItemHeight;
        }
    
        public int getItemWidth() {
            return mItemWidth;
        }
    
        /** * @return 当垂直滚动时，mItemSize = mItemHeight;水平滚动时，mItemSize = mItemWidth */
        public int getItemSize() {
            return mItemSize;
        }
    
        /** * @return 中间item的起始坐标x(不考虑偏移), 当垂直滚动时，x = mCenterPosition*mItemWidth */
        public int getCenterX() {
            return mCenterX;
        }
    
        /** * @return 中间item的起始坐标y(不考虑偏移), 当垂直滚动时，y= mCenterPosition*mItemHeight */
        public int getCenterY() {
            return mCenterY;
        }
    
        /** * @return 当垂直滚动时，mCenterPoint = mCenterY;水平滚动时，mCenterPoint = mCenterX */
        public int getCenterPoint() {
            return mCenterPoint;
        }
    
        public boolean isDisallowTouch() {
            return mDisallowTouch;
        }
    
        /** * 设置是否允许手动触摸滚动 * * @param disallowTouch */
        public void setDisallowTouch(boolean disallowTouch) {
            mDisallowTouch = disallowTouch;
        }
    
        /** * 中间item的位置，0 <= centerPosition <= mVisibleItemCount * * @param centerPosition */
        public void setCenterPosition(int centerPosition) {
            if (centerPosition < 0) {
                mCenterPosition = 0;
            } else if (centerPosition >= mVisibleItemCount) {
                mCenterPosition = mVisibleItemCount - 1;
            } else {
                mCenterPosition = centerPosition;
            }
            mCenterY = mCenterPosition * mItemHeight;
            invalidate();
        }
    
        /** * 中间item的位置,默认为 mVisibleItemCount / 2 * * @return */
        public int getCenterPosition() {
            return mCenterPosition;
        }
    
        public void setCenterItemBackground(Drawable centerItemBackground) {
            mCenterItemBackground = centerItemBackground;
            mCenterItemBackground.setBounds(mCenterX, mCenterY, mCenterX + mItemWidth, mCenterY + mItemHeight);
            invalidate();
        }
    
        public void setCenterItemBackground(int centerItemBackgroundColor) {
            mCenterItemBackground = new ColorDrawable(centerItemBackgroundColor);
            mCenterItemBackground.setBounds(mCenterX, mCenterY, mCenterX + mItemWidth, mCenterY + mItemHeight);
            invalidate();
        }
    
        public Drawable getCenterItemBackground() {
            return mCenterItemBackground;
        }
    
        public boolean isScrolling() {
            return mIsFling || mIsMovingCenter || mIsAutoScrolling;
        }
    
        public boolean isFling() {
            return mIsFling;
        }
    
        public boolean isMovingCenter() {
            return mIsMovingCenter;
        }
    
        public boolean isAutoScrolling() {
            return mIsAutoScrolling;
        }
    
        public boolean isCanTap() {
            return mCanTap;
        }
    
        /** * 设置 单击切换选项或触发点击监听器 * * @param canTap */
        public void setCanTap(boolean canTap) {
            mCanTap = canTap;
        }
    
        public boolean isHorizontal() {
            return mIsHorizontal;
        }
    
        public boolean isVertical() {
            return !mIsHorizontal;
        }
    
        public void setHorizontal(boolean horizontal) {
            if (mIsHorizontal == horizontal) {
                return;
            }
            mIsHorizontal = horizontal;
            reset();
            if (mIsHorizontal) {
                mItemSize = mItemWidth;
            } else {
                mItemSize = mItemHeight;
            }
            invalidate();
        }
    
        public void setVertical(boolean vertical) {
            if (mIsHorizontal == !vertical) {
                return;
            }
            mIsHorizontal = !vertical;
            reset();
            if (mIsHorizontal) {
                mItemSize = mItemWidth;
            } else {
                mItemSize = mItemHeight;
            }
            invalidate();
        }
    
        public boolean isDrawAllItem() {
            return mDrawAllItem;
        }
    
        public void setDrawAllItem(boolean drawAllItem) {
            mDrawAllItem = drawAllItem;
        }
    
        /** * @author huangziwei */
        public interface OnSelectedListener {
            void onSelected(ScrollPickerView scrollPickerView, int position);
        }
    
        public int dip2px(float dipVlue) {
            DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
            float sDensity = metrics.density;
            return (int) (dipVlue * sDensity + 0.5F);
        }
    
        @Override
        public void setVisibility(int visibility) {
            super.setVisibility(visibility);
            if (visibility == VISIBLE) {
                moveToCenter();
            }
        }
    }

ColorUtil 类

package com.demo.utils;
    
    import android.graphics.Color;
    
    /** * 颜色工具栏 */
    public class ColorUtil { 
    
        /** * 计算渐变后的颜色 * * @param startColor 开始颜色 * @param endColor 结束颜色 * @param rate 渐变率（0,1） * @return 渐变后的颜色，当rate=0时，返回startColor，当rate=1时返回endColor */
        public static int computeGradientColor(int startColor, int endColor, float rate) {
            if (rate < 0) {
                rate = 0;
            }
            if (rate > 1) {
                rate = 1;
            }
    
            int alpha = Color.alpha(endColor) - Color.alpha(startColor);
            int red = Color.red(endColor) - Color.red(startColor);
            int green = Color.green(endColor) - Color.green(startColor);
            int blue = Color.blue(endColor) - Color.blue(startColor);
    
            return Color.argb(
                    Math.round(Color.alpha(startColor) + alpha * rate),
                    Math.round(Color.red(startColor) + red * rate),
                    Math.round(Color.green(startColor) + green * rate),
                    Math.round(Color.blue(startColor) + blue * rate));
        }
    }

调用

/** * 温度 */
            airTemperatureView = new AirTemperatureView(context);
            LinearLayout.LayoutParams airTemperatureView_Params = new LinearLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,Axis.scaleX(230));
            airTemperatureView_Params.setMargins(0,Axis.scaleX(100),0,0);
            bodyLayout.addView(airTemperatureView,airTemperatureView_Params);//父布局 addView()
            airTemperatureView.setOnTemperatureListener(new AirTemperatureView.TemperatureListener() {
                @Override
                public void setAirTemper(int temperature) {
                    LogUtils.e("空调温度===",temperature+"");
                    setTemperature(temperature);//网络请求方法
                }
            });

[SouthEast]: /images/20220601/989ed885de0d4244b60a6887b2ab7fd1.png