自定义控件 ------ 画圆+背景色

 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 stub
24         mBgPaint.setColor(Color.WHITE);
25         mBgPaint.setAntiAlias(true);
26     }
27 
28     public CircleView(Context context) {
29         super(context);
30         // TODO Auto-generated constructor stub
31         mBgPaint.setColor(Color.WHITE);
32         mBgPaint.setAntiAlias(true);
33     }
34 
35     @Override
36     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
37         // TODO Auto-generated method stub
38         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     @Override
46     public void setBackgroundColor(int color) {
47         // TODO Auto-generated method stub
48         mBgPaint.setColor(color);
49     }
50 
51     /**
52      * 设置通知个数显示
53      * @param text
54      */
55     public void setNotifiText(int text) {
56         setText(text + "");
57     }
58 
59     @Override
60     public void draw(Canvas canvas) {
61         // TODO Auto-generated method stub
62         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);