Android自定义分段式进度条

package com.djt.aienglish.widget;

import Android.content.Context;
import android.content.res.TypedArray;
import android.graphics.canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Build;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

import androidx.annotation.Nullable;
import androidx.annotation.Requiresapi;

import com.djt.aienglish.R;


public class SegmentProgressBar extends View {
    
    private static final int DEFAULT_HEIGHT_PROGRESS_BAR = 10;
    
    private static final float mRadius = 60;
    
    private int defaultBackgroundColor = Color.parseColor("#DDE4F4");
    
    private int defaultProgressBarColor = Color.parseColor("#3D7EFE");

    
    protected Paint mPaint = new Paint();
    
    protected float mOffset = 0;
    protected float mDefaultOffset = 10;

    
    protected int mProgressBarHeight = dp2px(DEFAULT_HEIGHT_PROGRESS_BAR);

    
    protected float mRealWidth;
    
    private int mMax = 100;
    
    private int mProgress = 0;
    
    private float progressWith = 0;


    public SegmentProgressBar(Context context) {
        this(context, null);
    }

    public SegmentProgressBar(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SegmentProgressBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initDefaultValues(context, attrs, defStyleAttr);
        init();
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public SegmentProgressBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        initDefaultValues(context, attrs, defStyleAttr);
        init();
    }

    
    private void initDefaultValues(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        TypedArray arr =
                context.obtainStyledAttributes(attrs, R.styleable.ProgressBar, defStyleAttr, defStyleAttr);
        if (arr != null) {
            mProgress = arr.getInt(R.styleable.ProgressBar_progress, 0);
            mMax = arr.getInt(R.styleable.ProgressBar_max, 0);
            defaultBackgroundColor = arr.getColor(R.styleable.ProgressBar_progressBackground, Color.parseColor("#DDE4F4"));
            defaultProgressBarColor = arr.getColor(R.styleable.ProgressBar_progressBarColor, Color.parseColor("#3D7EFE"));
        }
        arr.recycle();
    }


    
    private void init() {
    }


    
    public void setMax(int max) {
        this.mMax = max;
        if (max > 0) {
            mOffset = mRealWidth / mMax / 8;
            if (mOffset > mDefaultOffset) {
                mOffset = mDefaultOffset;
            }
            progressWith = (mRealWidth - (mMax - 1) * mOffset) / mMax;
        }
        invalidate();
    }

    
    public void setProgress(int progress) {
        this.mProgress = progress;
        invalidate();
    }

    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int width = MeasureSpec.getSize(widthMeasureSpec);
        //高度
        int height = measureHeight(heightMeasureSpec);
        //必须调用该方法来存储View经过测量的到的宽度和高度
        setMeasuredDimension(width, height);
        //真正的宽度值是减去左右padding
        mRealWidth = getMeasuredWidth() - getPaddingRight() - getPaddingLeft();
        //使用画笔在画布上绘制进度
        if (mMax > 0) {
            mOffset = mRealWidth / mMax / 8;
            if (mOffset > mDefaultOffset) {
                mOffset = mDefaultOffset;
            }
            progressWith = (mRealWidth - (mMax - 1) * mOffset) / mMax;
        }
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        //真正的宽度值是减去左右padding
        mRealWidth = w - getPaddingRight() - getPaddingLeft();
        //使用画笔在画布上绘制进度
        if (mMax > 0) {
            mOffset = mRealWidth / mMax / 8;
            if (mOffset > mDefaultOffset) {
                mOffset = mDefaultOffset;
            }
            progressWith = (mRealWidth - (mMax - 1) * mOffset) / mMax;
        }
        invalidate();
    }

    
    private int measureHeight(int measureSpec) {
        int result = 0;
        //父布局告诉我们控件的类型
        int specMode = MeasureSpec.getMode(measureSpec);
        //父布局传过来的视图大小
        int specSize = MeasureSpec.getSize(measureSpec);
        if (specMode == MeasureSpec.EXACTLY) {
            result = specSize;
        } else {
            result = (int) (getPaddingTop() + getPaddingBottom() + mProgressBarHeight);
            if (specMode == MeasureSpec.AT_MOST) {
                result = Math.min(result, specSize);
            }
        }
        return result;
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected synchronized void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        mPaint.setColor(defaultBackgroundColor);
        //设置画笔类型
        mPaint.setStyle(Paint.Style.FILL);
        //去除锯齿
        mPaint.setAntiAlias(true);
        //使用画笔在画布上绘制背景
        canvas.drawRoundRect(0, 0, mRealWidth, getHeight(), mRadius, mRadius, mPaint);
        //绘制进度条
        mPaint.setColor(defaultProgressBarColor);
        for (int i = 0; i < mProgress; i++) {
            canvas.drawRoundRect(i * (progressWith + mOffset), 0, progressWith + i * (progressWith + mOffset), getHeight(), mRadius, mRadius, mPaint);
        }
    }

    
    protected int dp2px(int dpVal) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dpVal, getResources().getDisplayMetrics());
    }
}

<!--分段式进度条-->
    <declare-styleable name="ProgressBar">
        <attr name="progress" fORMat="integer" />
     <attr name="max" format="integer" />
        <attr name="progressBarColor" format="color" />
        <attr name="progressBackground" format="color" />
</declare-styleable>

<com.djt.aienglish.widget.SegmentProgressBar
                    android:id="@+id/spb"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    app:max="10"
                    app:progress="1" />