安卓Android自定義控件之自定義時鐘

源碼地址： https://github.com/senonwx/CustomClock.git

作出的效果

貼出核心代碼

1.繪製錶盤

private void drawCircle(Canvas canvas) {
    mPaint.setStyle(Paint.Style.STROKE);
    canvas.drawCircle(width/2,height/2,width/2-padding,mPaint);
}

2.繪製刻度

private void drawScale(Canvas canvas){
        mPaint.setStyle(Paint.Style.FILL);
        for (int i = 0; i < 12; i++) {
            if(i % 3 == 0)
                canvas.drawLine(width/2,padding,height/2,padding+4+20,mPaint);
            else
                canvas.drawLine(width/2,padding,height/2,padding+4+10,mPaint);
            canvas.rotate(30,width/2,height/2);
        }
    }

3.繪製指針

private void drawPointer(Canvas canvas){
        mCalendar = Calendar.getInstance();
        mHour = mCalendar.get(Calendar.HOUR);
        mMinute = mCalendar.get(Calendar.MINUTE);
        mSecond = mCalendar.get(Calendar.SECOND);
        //時針
        mDegrees = mHour * 30 + mMinute / 2;
        mPaint.setColor(Color.BLACK);
        mPaint.setStrokeWidth(6);
        canvas.save();
        canvas.rotate(mDegrees,width/2,height/2);
        canvas.drawLine(width/2,height/2,width/2,height/2-mHourLine,mPaint);
        canvas.restore();
        //分針
        mPaint.setColor(Color.GRAY);
        mPaint.setStrokeWidth(4);
        mDegrees = mMinute * 6 + mSecond / 10;
        canvas.save();
        canvas.rotate(mDegrees,width/2,height/2);
        canvas.drawLine(width/2,height/2,width/2,height/2-mMinuateLine,mPaint);
        canvas.restore();
        //秒針
        mPaint.setStrokeWidth(2);
        mPaint.setColor(Color.GREEN);
        mDegrees = mSecond * 6;
        canvas.save();
        canvas.rotate(mDegrees,width/2,width/2);
        canvas.drawLine(width/2,height/2,width/2,height/2-mSecondLine,mPaint);
        canvas.restore();
        mPaint.setColor(Color.BLACK);
    }

4.繪製文字

private void drawStr(Canvas canvas){
        mPaint.setTextSize(40);
        StringBuffer sb = new StringBuffer();
        if(mHour<10){
            sb.append("0").append(String.valueOf(mHour)).append(":");
        }else{
            sb.append(String.valueOf(mHour)).append(":");
        }
        if(mMinute<10){
            sb.append("0").append(String.valueOf(mMinute)).append(":");
        }else{
            sb.append(String.valueOf(mMinute)).append(":");
        }
        if(mSecond<10){
            sb.append("0").append(String.valueOf(mSecond));
        }else{
            sb.append(String.valueOf(mSecond));
        }
        String time = sb.toString();
        int strW = (int) mPaint.measureText(time);
        canvas.drawText(time,width/2-strW/2,height/2+60,mPaint);
    }

5.實現指針轉動

private Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            invalidate();
        }
    };

    @Override
    protected void onDraw(Canvas canvas) {
        drawCircle(canvas);
        drawScale(canvas);
        drawPointer(canvas);
        drawStr(canvas);
        mHandler.sendEmptyMessage(0);
    }

源碼地址在最上方哦！！！