这几天对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

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.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();

}

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;

}

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);

}

@Override

protected void onDraw(Canvas canvas) {

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;

// invalidate();

postInvalidate();

}

}

attrs.xml

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。