自定义漂亮的圆形进度条

对Android中实现画圆弧及圆弧效果中所实现的效果进行了修改，改为进度圆心进度条，效果如图所示




 




TasksCompletedView.java 代码如下

package com.snailws.taskscompleted.activity;


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


import com.snailws.taskscompleted.R;


/**
 * @author naiyu(http://snailws.com)
 * @version 1.0
 */
public class TasksCompletedView extends View {


	// 画实心圆的画笔
	private Paint mCirclePaint;
	// 画圆环的画笔
	private Paint mRingPaint;
	// 画字体的画笔
	private Paint mTextPaint;
	// 圆形颜色
	private int mCircleColor;
	// 圆环颜色
	private int mRingColor;
	// 半径
	private float mRadius;
	// 圆环半径
	private float mRingRadius;
	// 圆环宽度
	private float mStrokeWidth;
	// 圆心x坐标
	private int mXCenter;
	// 圆心y坐标
	private int mYCenter;
	// 字的长度
	private float mTxtWidth;
	// 字的高度
	private float mTxtHeight;
	// 总进度
	private int mTotalProgress = 100;
	// 当前进度
	private int mProgress;


	public TasksCompletedView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// 获取自定义的属性
		initAttrs(context, attrs);
		initVariable();
		Log.v("xulongheng*TasksCompletedView*","*******");
	}


	private void initAttrs(Context context, AttributeSet attrs) {
		TypedArray typeArray = context.getTheme().obtainStyledAttributes(attrs,
				R.styleable.TasksCompletedView, 0, 0);
		mRadius = typeArray.getDimension(R.styleable.TasksCompletedView_radius, 80);
		mStrokeWidth = typeArray.getDimension(R.styleable.TasksCompletedView_strokeWidth, 10);
		mCircleColor = typeArray.getColor(R.styleable.TasksCompletedView_circleColor, 0xFFFFFFFF);
		mRingColor = typeArray.getColor(R.styleable.TasksCompletedView_ringColor, 0xFFFFFFFF);
		
		mRingRadius = mRadius + mStrokeWidth / 2;
		
		Log.v("xulongheng*TasksCompletedView*initAttrs",mRadius+"/"+mStrokeWidth+"/"+mCircleColor+"/"+mRingColor);
	}


	private void initVariable() {
		mCirclePaint = new Paint();
		mCirclePaint.setAntiAlias(true);
		mCirclePaint.setColor(mCircleColor);
		mCirclePaint.setStyle(Paint.Style.FILL);
		
		mRingPaint = new Paint();
		mRingPaint.setAntiAlias(true);
		mRingPaint.setColor(mRingColor);
		mRingPaint.setStyle(Paint.Style.STROKE);
		mRingPaint.setStrokeWidth(mStrokeWidth);
		
		mTextPaint = new Paint();
		mTextPaint.setAntiAlias(true);
		mTextPaint.setStyle(Paint.Style.FILL);
		mTextPaint.setARGB(255, 255, 255, 255);
		mTextPaint.setTextSize(mRadius / 2);
		
		FontMetrics fm = mTextPaint.getFontMetrics();
		mTxtHeight = (int) Math.ceil(fm.descent - fm.ascent);
		
	}


/***	canvas.drawArc(new RectF(0, 0, 128, 128), 0, 360, true, new Paint(
			Paint.ANTI_ALIAS_FLAG));
			参数1：圆的范围大小
			参数2：起始角度
			参数3：圆心角角度，360为圆，180为半圆
			参数4：中心搜索
			参数5：画笔Paint，可以设置画线or填充，设置颜色，设置线的粗细等等***/
			
	@Override
	protected void onDraw(Canvas canvas) {


		Log.v("xulongheng*TasksCompletedView*onDraw",":"+mProgress);
		mXCenter = getWidth() / 2;
		mYCenter = getHeight() / 2;
		
		canvas.drawCircle(mXCenter, mYCenter, mRadius, mCirclePaint);
		
		if (mProgress > 0 ) {
			RectF oval = new RectF();
			oval.left = (mXCenter - mRingRadius);
			oval.top = (mYCenter - mRingRadius);
			oval.right = mRingRadius * 2 + (mXCenter - mRingRadius);
			oval.bottom = mRingRadius * 2 + (mYCenter - mRingRadius);
			canvas.drawArc(oval, -90, ((float)mProgress / mTotalProgress) * 360, false, mRingPaint); //
//			canvas.drawCircle(mXCenter, mYCenter, mRadius + mStrokeWidth / 2, mRingPaint);
			String txt = mProgress + "%";
			mTxtWidth = mTextPaint.measureText(txt, 0, txt.length());
			canvas.drawText(txt, mXCenter - mTxtWidth / 2, mYCenter + mTxtHeight / 4, mTextPaint);
		}
	}
	
	public void setProgress(int progress) {
		mProgress = progress;
		Log.v("xulongheng*TasksCompletedView*setProgress",":"+mProgress);
//		invalidate();
		postInvalidate();
	}


}

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
     
    <declare-styleable name="TasksCompletedView">
        <attr name="radius" format="dimension"/>
        <attr name="strokeWidth" format="dimension"/>
        <attr name="circleColor" format="color"/>
        <attr name="ringColor" format="color"/>
    </declare-styleable>
     
</resources>

源码下载 ： http://download.csdn.net/detail/heng615975867/6649281