自定义圆环随机数

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main布局(自定义view控件)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <com.example.a_zidingiyiview_demo.RingView        android:layout_width="match_parent"        android:layout_height="match_parent"></com.example.a_zidingiyiview_demo.RingView></LinearLayout>

自定义view代码

public class RingView extends View {    private final Paint paint;    private final Context context;    private int i=1234;    public RingView(Context context) {        this(context,null);    }    public RingView(Context context, AttributeSet attrs) {        super(context, attrs);        this.context = context;        this.paint = new Paint();        this.paint.setAntiAlias(true); //消除锯齿        this.paint.setStyle(Paint.Style.STROKE); //绘制空心圆    }    @Override    protected void onDraw(Canvas canvas) {        // TODO Auto-generated method stub        int center = getWidth()/2;        int innerCircle = dip2px(context, 40); //设置内圆半径        int ringWidth = dip2px(context, 5); //设置圆环宽度        //绘制内圆        this.paint.setARGB(155, 167, 190, 206);        this.paint.setStrokeWidth(30);        this.paint.setColor(Color.YELLOW);        canvas.drawCircle(center,center, innerCircle, this.paint);        //绘制文字        Paint  textPaint = new Paint();        textPaint.setColor(Color.BLACK);        textPaint.setStyle(Paint.Style.FILL);        textPaint.setTextSize(25);        canvas.drawText(String.valueOf(i),330,370,textPaint);        //绘制圆环     /*   this.paint.setARGB(255, 212 ,225, 233);       this.paint.setStrokeWidth(2);        this.paint.setColor(Color.BLUE);        canvas.drawCircle(center,center, innerCircle+1+ringWidth/2, this.paint);        //绘制外圆       /* this.paint.setARGB(155, 167, 190, 206);        this.paint.setStrokeWidth(10);        this.paint.setColor(Color.RED);        canvas.drawCircle(center,center, innerCircle+ringWidth, this.paint);*/        super.onDraw(canvas);    }    /**     * 根据手机的分辨率从 dp 的单位 转成为 px(像素)     */    public static int dip2px(Context context, float dpValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (dpValue * scale + 0.5f);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                //随机数的工具                Random random = new Random();                //做计算                i=1001+(int)(Math.random()*1000);//                count++;                invalidate();                break;        }        return super.onTouchEvent(event);    }}
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