自定义view随机数点击事件

public class MyView extends View implements View.OnClickListener{

int[] colors = new int[]{
Color.RED,Color.YELLOW,Color.GREEN
};
int[] colores = new int[]{
Color.BLUE,Color.BLACK,Color.WHITE
};
//背景色
private int bgColor;
//文字色
private int textColor;
//文字大小
private int textSize;

private Paint paint;

private Rect r;

private String str = "4232";

public MyView(Context context) {
this(context,null);
}

public MyView(Context context, AttributeSet attrs) {
this(context, attrs,0);
}

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

TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.MyViewAttrs,defStyleAttr,0);
bgColor = ta.getColor(R.styleable.MyViewAttrs_bgColor, Color.BLACK);
textColor = ta.getColor(R.styleable.MyViewAttrs_textColor,Color.WHITE);
textSize = ta.getDimensionPixelSize(R.styleable.MyViewAttrs_textSize,(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
30,getResources().getDisplayMetrics()));
ta.recycle();
setOnClickListener(this);

paint = new Paint();
r = new Rect();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);        if(widthMode == MeasureSpec.EXACTLY){        }else{            widthSize = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,200,getResources().getDisplayMetrics());        }        if(heightMode == MeasureSpec.EXACTLY){        }else{            heightSize = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,100,getResources().getDisplayMetrics());        }        setMeasuredDimension(widthSize,heightSize);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //绘制矩形区域        paint.setColor(bgColor);        paint.setStrokeWidth(3);        paint.setAntiAlias(true);        canvas.drawRect(0,0,getMeasuredWidth(),getMeasuredHeight(),paint);        //获取文字宽高，绘制文字        paint.setTextSize(textSize);        paint.setColor(textColor);        paint.getTextBounds(str,0,str.length(),r);        canvas.drawText(str,getWidth()/2-r.width()/2,getHeight()/2+r.height()/2,paint);    }    //生成随机字符串    private String changeText(){        Random random = new Random();        String num = "";        for(int i = 0;i < 4;i++){            num = num + random.nextInt(10);        }        return num;    }    @Override    public void onClick(View view) {        str = changeText();        Random random = new Random();        int index = random.nextInt(3-1);        bgColor = colors[index];        textColor=colores[index];        invalidate();    }

//自定义属性
<declare-styleable name="MyViewAttrs">
<attr name="bgColor" format="color">#dddddd</attr>
<attr name="textColor" format="color">#ff0000</attr>
<attr name="textSize" format="dimension">30</attr>
</declare-styleable>