1 import android.content.Context; 2 import android.graphics.Canvas; 3 import android.graphics.Color; 4 import android.graphics.Paint; 5 import android.graphics.PaintFlagsDrawFilter; 6 import android.util.AttributeSet; 7 import android.widget.TextView; 8  9 public class CircleView extends TextView {
      11     private Paint mBgPaint = new Paint();13     PaintFlagsDrawFilter pfd = new PaintFlagsDrawFilter(0,14             Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);15 16     public CircleView(Context context, AttributeSet attrs, int defStyle) {17         super(context, attrs, defStyle);19     }20 21     public CircleView(Context context, AttributeSet attrs) {22         super(context, attrs);23         // TODO Auto-generated constructor stub24         mBgPaint.setColor(Color.WHITE);25         mBgPaint.setAntiAlias(true);26     }27 28     public CircleView(Context context) {29         super(context);30         // TODO Auto-generated constructor stub31         mBgPaint.setColor(Color.WHITE);32         mBgPaint.setAntiAlias(true);33     }34 35     @Override36     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {37         // TODO Auto-generated method stub38         super.onMeasure(widthMeasureSpec, heightMeasureSpec);39         int measuredWidth = getMeasuredWidth();40         int measuredHeight = getMeasuredHeight();41         int max = Math.max(measuredWidth, measuredHeight);42         setMeasuredDimension(max, max);43     }44 45     @Override46     public void setBackgroundColor(int color) {47         // TODO Auto-generated method stub48         mBgPaint.setColor(color);49     }50 51     /**52      * 设置通知个数显示53      * @param text54      */55     public void setNotifiText(int text) {56         setText(text + "");57     }58 59     @Override60     public void draw(Canvas canvas) {61         // TODO Auto-generated method stub62         canvas.setDrawFilter(pfd);63         canvas.drawCircle(getWidth() / 2, getHeight() / 2,64                 Math.max(getWidth(), getHeight()) / 2, mBgPaint);65         super.draw(canvas);66     }67 }70 71 =============================74 75 private CircleView circleTextview;76 circleTextview = (CircleView) findViewById(R.id.circleTextview);77         circleTextview.setBackgroundColor(Color.RED);