Android实现首页倒计时跳过的View

效果图

public class SplashJumpView extends View {
    private int mSplashDuration;
    private int mCircleRadius = 120;
    private int mRealWidth;
    Paint circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    Paint textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    Paint numberPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    Paint secondPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    public SplashJumpView(Context context) {
        this(context,null);
    }

    public SplashJumpView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init(){
        circlePaint.setColor(Color.GREEN);
        textPaint.setColor(Color.RED);
        textPaint.setTextSize(50);
        textPaint.setTextAlign(Paint.Align.CENTER);
        numberPaint.setColor(Color.BLUE);
        numberPaint.setTextSize(28);
        numberPaint.setTextAlign(Paint.Align.CENTER);
        secondPaint.setColor(Color.RED);
        secondPaint.setTextSize(20);
        secondPaint.setTextAlign(Paint.Align.CENTER);
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int expectSize = mCircleRadius*2 + getPaddingLeft() + getPaddingRight();
        int width = resolveSize(expectSize,widthMeasureSpec);
        int height = resolveSize(expectSize,heightMeasureSpec);
        //取宽和高中较小的一个值作为View的尺寸
        mRealWidth = Math.min(width,height);
        setMeasuredDimension(mRealWidth, mRealWidth);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawCircle(mRealWidth/2,mRealWidth/2,mCircleRadius,circlePaint);
        String tvContent = "跳过";
        canvas.drawText(tvContent,mRealWidth/2,mRealWidth/2,textPaint);
        float width = numberPaint.measureText(mSplashDuration+"");
        canvas.save();
        canvas.translate(-width,40);
        canvas.drawText(mSplashDuration+"",mRealWidth/2,mRealWidth/2,numberPaint);
        canvas.restore();
        canvas.translate(0,40);
        canvas.drawText("s",mRealWidth/2,mRealWidth/2,secondPaint);
    }

    public void setText(int splashDuration){
        mSplashDuration = splashDuration;
        invalidate();
    }
}