android自定义TextView实现绘制圆圈

public class CircleTextView extends TextView {
private Paint mPaint;

public CircleTextView(Context context) {
super(context);
}

public CircleTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public CircleTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
mPaint = new Paint();
//创建一个RectF，用来限定绘制圆弧的范围
RectF rectf = new RectF();
//设置画笔的颜色
mPaint.setColor(Color.GRAY);
//设置画笔的样式
mPaint.setStyle(Paint.Style.STROKE);
//设置抗锯齿
mPaint.setAntiAlias(true);
//设置画得一个半径，然后比较长和宽，以最大的值来确定长方形的长宽，确定半径
int r = getMeasuredWidth() > getMeasuredHeight() ? getMeasuredWidth() : getMeasuredHeight();
rectf.set(getPaddingLeft(), getPaddingTop(), r - getPaddingRight(), r - getPaddingBottom());
String testString ="CircleTextView";
Rect bounds = new Rect();
Paint paint=new Paint();
paint.setColor(Color.BLUE);
paint.setStyle(Paint.Style.FILL);
paint.getTextBounds(testString, 0, testString.length(), bounds);
//绘制文字
canvas.drawText(testString, getMeasuredWidth() / 2 - bounds.width() / 2, getMeasuredHeight() / 2 + bounds.height() / 2, paint);
//绘制圆弧
canvas.drawArc(rectf, 0, 360, false, mPaint);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}