Android自定义漂亮的圆形进度条

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

<?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://xiazai.jb51.net/201701/yuanma/AndroidCompleted(jb51.net).rar

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我们。