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;
}

}