CircleProgressBar.java
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package com.megvii.idcardlib.view;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.SweepGradient;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.View;
/**
*画倒计时圆通过传递 Progress和max来画
*/
public class CircleProgressBar extends View {
private static final int STD_WIDTH = 20;
private static final int STD_RADIUS = 75;
private final TextPaint textPaint;
SweepGradient sweepGradient = null;
private int progress = 100;
private int max = 100;
private Paint paint;
private RectF oval;
private int mWidth = STD_WIDTH;
private int mRadius = STD_RADIUS;
private Bitmap bit;
public CircleProgressBar(Context context, AttributeSet attrs) {
super(context, attrs);
paint = new Paint();
oval = new RectF();
textPaint = new TextPaint();
// bit = BitmapFactory.decodeResource(getResources(), R.drawable.mg_liveness_circle);
sweepGradient = new SweepGradient(getWidth() / 2, getHeight() / 2, new int[]{0xfffe9a8e, 0xff3fd1e4
, 0xffdc968e}, null);
}
public int getMax() {
return max;
}
public void setMax(int max) {
this.max = max;
}
public int getProgress() {
return progress;
}
public void setProgress(int progress) {
this.progress = progress;
invalidate();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
int use = width > height ? height : width;
int sum = STD_WIDTH + STD_RADIUS;
try {
mWidth = (STD_WIDTH * use) / (2 * sum);
mRadius = (STD_RADIUS * use) / (2 * sum);
} catch (Exception e) {
mWidth = 1;
mRadius = 1;
}
setMeasuredDimension(use, use);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
paint.setAntiAlias(true);
paint.setFlags(Paint.ANTI_ALIAS_FLAG);
paint.setColor(0xff000000);
paint.setStrokeWidth(mWidth);// 设置画笔宽度
paint.setStyle(Paint.Style.STROKE);// 设置中空的样式
canvas.drawCircle(mWidth + mRadius, mWidth + mRadius, mRadius, paint);// 在中心为（100,100）的地方画个半径为55的圆，宽度为setStrokeWidth：10，也就是灰色的底边
paint.setColor(0xff3fd1e4);// 设置画笔为绿色
oval.set(mWidth, mWidth, mRadius * 2 + mWidth, (mRadius * 2 + mWidth));// 设置类似于左上角坐标（45,45），右下角坐标（155,155），这样也就保证了半径为55
canvas.drawArc(oval, -90, ((float) progress / max) * 360, false, paint);// 画圆弧，第二个参数为：起始角度，第三个为跨的角度，第四个为true的时候是实心，false的时候为空心
paint.reset();
}
}