Android 自定义View圆形进度条

1.创建自定义属性文件：在values下面创建attrs.xml属性文件：

2. 实现自定义View类：

package com.xc.xcskin.view;

import com.xc.xcskin.R;
import com.xc.xcskin.R.styleable;

import android.R.integer;
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;

/**
 * 带进度百分比显示的进度条，线程安全的View，可直接在线程中更新进度
 * @author zhaozhiwei
 *
 */
public class XCRoundProgressBar extends View{

    
    
    private Paint paint;//画笔对象的引用
    private int roundColor;//圆环的颜色
    private int roundProgressColor;//圆环进度的颜色
    private int innerRoundColor;//圆环内部圆颜色
    private float roundWidth;//圆环的宽度
    private int textColor;//中间进度百分比字符串的颜色
    private float textSize ;//中间进度百分比字符串的字体
    private int max;//最大进度
    private int progress;//当前进度
    private boolean isDisplayText;//是否显示中间百分比进度字符串
    private int style;//进度条的风格：空心圆环或者实心圆环
    private static final int STROKE = 0;//空心
    private static final int FILL = 1;//实心
    
    public XCRoundProgressBar(Context context){
        this(context, null);
    }
    public XCRoundProgressBar(Context context,AttributeSet attrs){
        this(context,attrs,0);
    }
    public XCRoundProgressBar(Context context, AttributeSet attrs,
            int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        // TODO Auto-generated constructor stub
        
        paint  =  new Paint();
        //从attrs.xml中获取自定义属性和默认值
        TypedArray typedArray  = context.obtainStyledAttributes(attrs, R.styleable.XCRoundProgressBar);
        roundColor = typedArray.getColor(R.styleable.XCRoundProgressBar_roundColor, Color.GREEN);
        roundProgressColor = typedArray.getColor(R.styleable.XCRoundProgressBar_roundProgressColor, Color.RED);
        innerRoundColor = typedArray.getColor(R.styleable.XCRoundProgressBar_innerRoundColor, Color.GRAY);
        roundWidth = typedArray.getDimension(R.styleable.XCRoundProgressBar_roundWidth, 5);
        textColor  =typedArray.getColor(R.styleable.XCRoundProgressBar_textColor, Color.RED);
        textSize = typedArray.getDimension(R.styleable.XCRoundProgressBar_textSize, 15);
        max = typedArray.getInteger(R.styleable.XCRoundProgressBar_max, 100);
        style = typedArray.getInt(R.styleable.XCRoundProgressBar_style, STROKE);
        isDisplayText  =typedArray.getBoolean(R.styleable.XCRoundProgressBar_textIsDisplayable, true);
        typedArray.recycle();
        
    }
    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        
        //画最外层大圆环
        int centerX = getWidth()/2;//获取中心点X坐标
        int certerY = getHeight()/2;//获取中心点Y坐标
        int radius =(int)(centerX - roundWidth/2);//圆环的半径
        paint.setColor(roundColor);
        paint.setStyle(Paint.Style.STROKE);//设置空心
        paint.setStrokeWidth(roundWidth);//设置圆环宽度
        paint.setAntiAlias(true);//消除锯齿
        canvas.drawCircle(centerX,certerY, radius, paint);//绘制圆环
        
        //绘制圆环内部圆
        paint.setColor(innerRoundColor);
        paint.setStyle(Paint.Style.FILL);
        paint.setAntiAlias(true);
        canvas.drawCircle(centerX, certerY, radius-roundWidth/2, paint);
        
        
        
        //画进度
        paint.setStrokeWidth(roundWidth);//设置圆环宽度
        paint.setColor(roundProgressColor);//设置进度颜色
        RectF oval = new RectF(centerX - radius, centerX - radius, centerX 
                + radius, centerX + 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, 0, 360 * progress / max, false, paint); // 根据进度画圆弧
            break;
        }
        case FILL: {
            paint.setStyle(Paint.Style.FILL);
            if (progress != 0)
                canvas.drawArc(oval, 0, 360 * progress / max, true, paint); // 根据进度画圆弧
            break;
        }
        }
        //画中间进度百分比字符串
        paint.setStrokeWidth(0);
        paint.setColor(textColor);
        paint.setTextSize(textSize);
        paint.setTypeface(Typeface.DEFAULT_BOLD);
        int percent = (int)(((float)progress / (float)max) * 100);//计算百分比 
        float textWidth = paint.measureText(percent +"%");//测量字体宽度，需要居中显示
        
        if(isDisplayText && style == STROKE && percent != 0){
            canvas.drawText(percent+"%", centerX-textWidth/2, centerX + textSize/2, paint);
        }
        
        
    }
    public Paint getPaint() {
        return paint;
    }
    public void setPaint(Paint paint) {
        this.paint = paint;
    }
    public int getRoundColor() {
        return roundColor;
    }
    public void setRoundColor(int roundColor) {
        this.roundColor = roundColor;
    }
    public int getRoundProgressColor() {
        return roundProgressColor;
    }
    public void setRoundProgressColor(int roundProgressColor) {
        this.roundProgressColor = roundProgressColor;
    }
    public float getRoundWidth() {
        return roundWidth;
    }
    public void setRoundWidth(float roundWidth) {
        this.roundWidth = roundWidth;
    }
    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 synchronized int getMax() {
        return max;
    }
    public synchronized void setMax(int max) {
        if(max < 0){
            throw new IllegalArgumentException("max must more than 0");
        }
        this.max = max;
    }
    public synchronized int getProgress() {
        return progress;
    }
    /**
     * 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步
     * 刷新界面调用postInvalidate()能在非UI线程刷新
     * @author caizhiming
     */ 
    public synchronized void setProgress(int progress) {
        if(progress < 0){
            throw new IllegalArgumentException("progress must more than 0");
        }
        if(progress > max){
            this.progress = progress;
        }
        if(progress <= max){
            this.progress = progress;
            postInvalidate();
        }
    }
    public boolean isDisplayText() {
        return isDisplayText;
    }
    public void setDisplayText(boolean isDisplayText) {
        this.isDisplayText = isDisplayText;
    }
    public int getStyle() {
        return style;
    }
    public void setStyle(int style) {
        this.style = style;
    }

    
}

3.使用//我这里抽基了Activity，你们测试时候记得在布局中使用，必须设置宽高，找到ID 设置属性。不然没效果哦

public class MainActivity extends BaseActivity{


    private  int num =0;
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 1:
                    num++;
                    Log.i("AAAA", "handleMessage: "+num);
                    if (num!=100){
                        Message message = handler.obtainMessage(1);
                        handler.sendMessageDelayed(message,200);
                        Progress.setProgress(num+1);//设置已进度
                    }else if (num==100){
                        num = 0;
                        Message message = handler.obtainMessage(1);
                        handler.sendMessageDelayed(message,200);
                    }
            }
            super.handleMessage(msg);
        }
    };


    @Override
    protected void initData() {

        Message message = handler.obtainMessage(1);
        handler.sendMessageDelayed(message,200);


            Progress.setMax(100);//最大值
            Progress.setTextSize(50);//中间数字大小
            Progress.setRoundWidth(40);//画笔宽度
            Progress.setDisplayText(true);//是否显示中间进度百分比
  
    }

原博客自定义进度条