圆形背景TextView

package com.example.circletextview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.util.AttributeSet;
import android.widget.TextView;

public class CircleView extends TextView {

private Paint mBgPaint = new Paint();

PaintFlagsDrawFilter pfd = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);

public CircleView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}

public CircleView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
mBgPaint.setColor(Color.WHITE);
mBgPaint.setAntiAlias(true);
}

public CircleView(Context context) {
super(context);
// TODO Auto-generated constructor stub
mBgPaint.setColor(Color.WHITE);
mBgPaint.setAntiAlias(true);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int measuredWidth = getMeasuredWidth();
int measuredHeight = getMeasuredHeight();
int max = Math.max(measuredWidth, measuredHeight);
setMeasuredDimension(max, max);
}

@Override
public void setBackgroundColor(int color) {
// TODO Auto-generated method stub
mBgPaint.setColor(color);
}

/**
* 设置通知个数显示
* @param text
*/
public void setNotifiText(int text){
//      if(text>99){
//          String string = 99+"+";
//          setText(string);
//          return;
//      }
setText(text+"");
}

@Override
public void draw(Canvas canvas) {
// TODO Auto-generated method stub
canvas.setDrawFilter(pfd);
canvas.drawCircle(getWidth()/2, getHeight()/2, Math.max(getWidth(), getHeight())/2, mBgPaint);
super.draw(canvas);
}
}

circleTextview = (CircleView) findViewById(R.id.circleTextview);
circleTextview.setBackgroundColor(Color.RED);