本文共 4173 字，大约阅读时间需要 13 分钟。

package com.domain.zjl.androidhero;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.os.Handler;import android.util.AttributeSet;import android.util.Log;import android.view.View;import java.util.Calendar;/** * Created by xiaoji94shen on 2016/9/1. */public class MyClockView extends View {    private Handler mHandler;    private Runnable mRunnable;    private Paint mPaint;    public MyClockView(Context context) {        super(context);        init();    }    public MyClockView(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    private void init() {        mHandler = new Handler();        initPaint();        mRunnable = new Runnable() {            @Override            public void run() {                postInvalidate();                mHandler.postDelayed(this, 1000);            }        };        mHandler.postDelayed(mRunnable, 1000);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        drawBigCircle(canvas);        drawLinesAndNumbers(canvas);        drawPoint(canvas);        drawLines(canvas);    }    private void initPaint() {        mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setColor(Color.BLACK);    }    private void drawLines(Canvas canvas) {        Calendar calendar = Calendar.getInstance();        float hour = calendar.get(Calendar.HOUR);        float min = calendar.get(Calendar.MINUTE);        float secode = calendar.get(Calendar.SECOND);        mPaint.setStyle(Paint.Style.FILL);        float startX = getWidth() / 2;        float endX = startX;        float startY = getHeight() / 2;        float endY = startY - 80;        canvas.save();        float hourDegree = (hour + min / 60) * (360 / 12);        canvas.rotate(hourDegree, getWidth() / 2, getHeight() / 2);        canvas.drawLine(startX, startY, endX, endY, mPaint);        canvas.restore();        canvas.save();        float minDegree = (min + secode / 60) * 360 / 60;        canvas.rotate(minDegree, getWidth() / 2, getHeight() / 2);        canvas.drawLine(startX, startY, endX, endY - 20, mPaint);        canvas.restore();        canvas.save();        float secondeDegree = secode * 360 / 60;        canvas.rotate(secondeDegree, getWidth() / 2, getHeight() / 2);        canvas.drawLine(startX, startY, endX, endY - 40, mPaint);        canvas.restore();    }    private void drawPoint(Canvas canvas) {        mPaint.setStyle(Paint.Style.FILL);        canvas.drawCircle(getWidth() / 2, getHeight() / 2, 6, mPaint);    }    private void drawBigCircle(Canvas canvas) {        mPaint.setStyle(Paint.Style.STROKE);        canvas.drawCircle(getWidth() / 2, getHeight() / 2, getWidth() / 2 - 4, mPaint);    }    private void drawLinesAndNumbers(Canvas canvas) {        canvas.save();        int logHeight = 16;        int shortHeight = 8;        int startX = getWidth() / 2;        int stopX = startX;        int radius = getWidth() / 2 - 4;        int startY = getHeight() / 2 - radius;        int stopY = 0;        int degree = 360 / 60;        mPaint.setStyle(Paint.Style.FILL);        mPaint.setTextSize(25);        String[] numbers = new String[]{"12", "1", "2", "3", "4", "5",                "6", "7", "8", "9", "10", "11"};        int j = 0;        for (int i = 0; i < 60; i++) {            if (i % 5 == 0) {                stopY = startY + logHeight;                j++;            } else {                stopY = startY + shortHeight;            }            canvas.drawLine(startX, startY, stopX, stopY, mPaint);            if (i % 5 == 0) {                String num = numbers[j - 1];                Rect textBounds = new Rect();                mPaint.getTextBounds(num, 0, num.length(), textBounds);                int textStartX = (int) (startX - mPaint.measureText(num) / 2);                int textStartY = (int) (stopY + textBounds.height()) + 2;                canvas.drawText(numbers[j - 1], textStartX, textStartY, mPaint);            }            canvas.rotate(degree, getWidth() / 2, getHeight() / 2);        }        canvas.restore();    }}

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