自定义圆形进度条控件，及圆形渐变颜色实现

圆形进度条的实现网上搜有很多，项目中需要用到就拿来主义了，然后进行了适当的改进。

1. 自定义控件实现

java类

package com.xxx.views;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.View;

import com.xxx.R;

public class RoundProgress extends View {
    /**
     * 画笔对象的引用
     */
    private Paint paint;

    /**
     * 圆环的颜色
     */
    private int roundColor;

    /**
     * 圆环进度的颜色
     */
    private int roundProgressColor;

    /**
     * 中间进度百分比的字符串的颜色
     */
    private int textColor;

    /**
     * 中间进度百分比的字符串的字体大小
     */
    private float textSize;

    /**
     * 圆环的宽度
     */
    private float roundWidth;

    /**
     * 最大进度
     */
    private int max;

    /**
     * 当前进度
     */
    private int progress;
    /**
     * 是否显示中间的进度
     */
    private boolean textIsDisplayable;

    /**
     * 进度的风格，实心或者空心
     */
    private int style;

    public static final int STROKE = 0;
    public static final int FILL = 1;


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

    public RoundProgress(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public RoundProgress(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        paint = new Paint();

        TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgress);

        //获取自定义属性和默认值
        roundColor = mTypedArray.getColor(R.styleable.RoundProgress_round_color, Color.GRAY);
        roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgress_round_progress_color, Color.RED);
        textColor = mTypedArray.getColor(R.styleable.RoundProgress_text_color, Color.RED);
        textSize = mTypedArray.getDimension(R.styleable.RoundProgress_text_size, 15);
        roundWidth = mTypedArray.getDimension(R.styleable.RoundProgress_round_width, 5);
        max = mTypedArray.getInteger(R.styleable.RoundProgress_max_, 100);
        textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgress_text_isDisplayable, false);
        style = mTypedArray.getInt(R.styleable.RoundProgress_style_, STROKE);

        mTypedArray.recycle();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        //测量控件应占的宽高大小，此处非必需，只是为了确保布局中设置的宽高不一致时仍显示完整的圆
        int measureWidth = MeasureSpec.getSize(widthMeasureSpec);
        int measureHeight = MeasureSpec.getSize(heightMeasureSpec);
        setMeasuredDimension(Math.min(measureWidth, measureHeight), Math.min(measureWidth, measureHeight));
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        /**
         * 画最外层的大圆环
         */
        int centre = getWidth() / 2; //获取圆心的x坐标
        int radius = (int) (centre - roundWidth / 2); //圆环的半径
        paint.setColor(roundColor); //设置圆环的颜色
        paint.setStyle(Paint.Style.STROKE); //设置空心
        paint.setStrokeWidth(roundWidth); //设置圆环的宽度
        paint.setAntiAlias(true);  //消除锯齿
        canvas.drawCircle(centre, centre, radius, paint); //画出圆环

        /**
         * 画进度百分比
         */
        paint.setStrokeWidth(0);
        paint.setColor(textColor);
        paint.setTextSize(textSize);
        paint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体
        int percent = (int) (((float) progress / (float) max) * 100);  //中间的进度百分比，先转换成float在进行除法运算，不然都为0
        float textWidth = paint.measureText(percent + "%");   //测量字体宽度，我们需要根据字体的宽度设置在圆环中间

        if (textIsDisplayable && percent != 0 && style == STROKE) {
            canvas.drawText(percent + "%", centre - textWidth / 2, centre + textSize / 2, paint); //画出进度百分比
        }


        /**
         * 画圆弧 ，画圆环的进度
         */

        //设置进度是实心还是空心
        paint.setStrokeWidth(roundWidth); //设置圆环的宽度
        paint.setColor(roundProgressColor);  //设置进度的颜色
        RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius);  //用于定义的圆弧的形状和大小的界限

        switch (style) {
            case STROKE: {
                paint.setStyle(Paint.Style.STROKE);
                canvas.drawArc(oval, -90, 360 * progress / max, false, paint);  //根据进度画圆弧
                break;
            }
            case FILL: {
                paint.setStyle(Paint.Style.FILL_AND_STROKE);
                if (progress != 0)
                    canvas.drawArc(oval, -90, 360 * progress / max, true, paint);  //根据进度画圆弧
                break;
            }
        }
    }

    public synchronized int getMax() {
        return max;
    }

    /**
     * 设置进度的最大值
     * @param max
     */
    public synchronized void setMax(int max) {
        if(max < 0){
            throw new IllegalArgumentException("max not less than 0");
        }
        this.max = max;
    }

    /**
     * 获取进度.需要同步
     * @return
     */
    public synchronized int getProgress() {
        return progress;
    }

    /**
     * 设置进度，此为线程安全控件，由于考虑多线程问题，需要同步
     * 刷新界面调用postInvalidate()能在非UI线程刷新
     * @param progress
     */
    public synchronized void setProgress(int progress) {
        if(progress < 0){
            throw new IllegalArgumentException("progress not less than 0");
        }
        if(progress > max){
            progress = max;
        }
        if(progress <= max){
            this.progress = progress;
            postInvalidate();
        }

    }

    public int getCricleColor() {
        return roundColor;
    }

    public void setCricleColor(int cricleColor) {
        this.roundColor = cricleColor;
    }

    public int getCricleProgressColor() {
        return roundProgressColor;
    }

    public void setCricleProgressColor(int cricleProgressColor) {
        this.roundProgressColor = cricleProgressColor;
    }

    public int getTextColor() {
        return textColor;
    }

    public void setTextColor(int textColor) {
        this.textColor = textColor;
    }

    public float getTextSize() {
        return textSize;
    }

    public void setTextSize(float textSize) {
        this.textSize = textSize;
    }

    public float getRoundWidth() {
        return roundWidth;
    }

    public void setRoundWidth(float roundWidth) {
        this.roundWidth = roundWidth;
    }

}

attr.xml文件

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="RoundProgress">
        <attr name="round_color" format="color" />
        <attr name="round_progress_color" format="color" />
        <attr name="round_width" format="dimension"/>
        <attr name="text_color" format="color" />
        <attr name="text_size" format="dimension" />
        <attr name="max_" format="integer"/>
        <attr name="text_isDisplayable" format="boolean"/>
        <attr name="style_">
            <enum name="STROKE" value="0"/>
            <enum name="FILL" value="1"/>
        </attr>
    </declare-styleable>
</resources>

注意：在自定义控件属性时，若在android工程中已经定义了一个控件的属性名称与此控件属性名称相同，则在编译是会报错。

如：在工程中已经存在一个控件属性定义，而我们定义的控件属性中有与之相同的属性时

则编译会报错：

原本以为 declare-styleable的name与 attr name一起才构成一个属性 RoundProgress_roundColor，但实际有点坑啊！

在layout中使用

<com.xxx.views.RoundProgress
    android:id="@+id/roundProgress"
    android:layout_width="120dp"
    android:layout_height="120dp"
    app:round_color="#ff8569"
    app:round_progress_color="#ffecd5"
    app:round_width="6dp"
    app:text_isDisplayable="true"
    app:text_size="16sp"/>

2.圆形渐变颜色实现：

    @Override

    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        /**
         * 画最外层的大圆环
         */
        int centre = getWidth() / 2; //获取圆心的x坐标
        int radius = (int) (centre - roundWidth / 2); //圆环的半径
//        paint.setColor(roundColor); //设置圆环的颜色
        paint.setStyle(Paint.Style.STROKE); //设置空心
        paint.setStrokeWidth(roundWidth); //设置圆环的宽度
        paint.setAntiAlias(true);  //消除锯齿

        SweepGradient sweepGradient = new SweepGradient(radius, radius, new int[]{Color.parseColor("#ff0000"), Color.parseColor("#00ff00")}, null);
        paint.setShader(sweepGradient); //设置渐变颜色
        canvas.rotate(-90, centre, centre); //SweepGradient默认是从3点钟位置开始渐变的，为了让它从12点钟位置开始渐变所以将画布旋转-90°

        canvas.drawCircle(centre, centre, radius, paint); //画出圆环

        ...
    }

自定义圆形进度条控件，及圆形渐变颜色实现

猜你喜欢