自定义view随机数点击事件

Posted 2020-10-10

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>