自定义view(自定义view的时候，三个构造函数各自的作用)

package com.timeshare.tmband.Utils;
 
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.util.Log;
import android.view.View;
 
import com.timeshare.tmband.R;
 
/**
 * 仿iphone带进度的进度条，线程安全的View，可直接在线程中更新进度
 *
 * @author ailin
 *
 */
public class RoundProgressBar 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
     */
    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;
 
    private int hour=0;
    private int min=0;
    private String tear=null;
 
    /**
     * 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 RoundProgressBar(Context context) {
        this(context, null);     //在java代码创建视图的时候被调用，如果是从xml填充的视图，就不会调用这个
    }
 
    public RoundProgressBar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
　　　　　//这个是在xml创建但是没有指定style的时候被调用
    }

 
    public RoundProgressBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
 
        paint = new Paint();
 
        TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
                R.styleable.RoundProgressBar);
 
        // 获取自定义属性和默认值
        roundColor = mTypedArray.getColor(
                R.styleable.RoundProgressBar_roundColor, Color.RED);
        roundProgressColor = mTypedArray.getColor(
                R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
        textColor = mTypedArray.getColor(
                R.styleable.RoundProgressBar_textColor, Color.GREEN);
        textSize = mTypedArray.getDimension(
                R.styleable.RoundProgressBar_textSize, 15);
        roundWidth = mTypedArray.getDimension(
                R.styleable.RoundProgressBar_roundWidth, 5);
        max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100);
        textIsDisplayable = mTypedArray.getBoolean(
                R.styleable.RoundProgressBar_textIsDisplayable, true);
        style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0);
 
        mTypedArray.recycle();
    }
 
    @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
 
        Log.e("log", centre + "");
 
        /**
         * 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  && style == STROKE) {
            canvas.drawText(percent + "", centre - textWidth / 2, centre
                    + textSize / 2, paint); // 画出进度百分比
 
            Paint paint1 = new Paint();
            paint1.setStrokeWidth(0);
            paint1.setColor(textColor);
            paint1.setTextSize(14);
            paint1.setTypeface(Typeface.DEFAULT_BOLD); // 设置字体
            canvas.drawText("%", centre + textWidth / 2, centre + textSize / 2,
                    paint1); // 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, 0, 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, 0, 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，由于考虑多线的问题，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;
    }
 
}