Android自定义View绘制闹钟

本文简单实现了一个闹钟，扩展View，Canvas绘制
效果如下：

代码如下：

package com.gaofeng.mobile.clock_demo;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;import java.util.Calendar;/*** Created by gaofeng on 15-8-29.*/
public class ClockView extends View {public ClockView(Context context) {super(context);ringHourBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.ring);ringMinBitmap  = BitmapFactory.decodeResource(getResources(),R.drawable.ring_min);syncTime();setSchedualTime(0);}public ClockView(Context context, AttributeSet attrs) {super(context, attrs);}public ClockView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}//半径和圆中心private static final float Radius = 200;private static final float CenterX = 250;private static final float CenterY = 250;private float secondsDegree = 0;private float minDegree = 0;private float hourDegree = 0;//定时private float setHourDegree;private float setMinDegree;private boolean setSchedual;private Bitmap ringHourBitmap;private Bitmap ringMinBitmap;private int bitmapWidth = 30,bitmapHeight = 30;@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);try {// 秒表进度Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}setBackgroundColor(Color.GREEN);drawCircle(canvas);drawClockPoint(canvas);drawIndicator(canvas);calc();drawSchedual(canvas);invalidate();}private void drawSchedual(Canvas canvas) {if (setSchedual) {Paint p = new Paint();//找到小时的坐标float rad = (float )Math.toRadians(setHourDegree);float x = (float) (Radius * Math.sin(rad)) ;float y = (float) (Radius * Math.cos(rad));float vx = CenterX + x;float vy = CenterY - y;//比较笨的方法解决 图片绘制在圆内。绘制都是从手机左上角开始的if (setHourDegree > 0 && setHourDegree <= 90) {vx = vx - bitmapWidth;}if (setHourDegree > 90 && setHourDegree < 180) {vx = vx - bitmapWidth;vy = vy - bitmapWidth;}if (setHourDegree > 180 && setHourDegree < 270) {vy = vy - bitmapWidth;}Log.d("","Range x:" + vx + " y:" + vy);canvas.drawBitmap(ringHourBitmap,vx ,vy ,p);//找到分钟的坐标rad = (float )Math.toRadians(setMinDegree);x = (float) (Radius * Math.sin(rad)) ;y = (float) (Radius * Math.cos(rad))  ;vx = CenterX + x;vy = CenterY - y;if (setMinDegree > 0 && setMinDegree <= 90) {vx = vx - bitmapWidth;}if (setMinDegree > 90 && setMinDegree < 180) {vx = vx - bitmapWidth;vy = vy - bitmapWidth;}if (setMinDegree > 180 && setMinDegree < 270) {vy = vy - bitmapWidth;}canvas.drawBitmap(ringMinBitmap,vx,vy ,p);p = null;}}private void calc() {secondsDegree = secondsDegree + 6;if (secondsDegree >=360) { //一圈为一分钟secondsDegree = 0;minDegree = minDegree + 6;}if (minDegree >= 360) { //一圈为一个小时minDegree = 0;hourDegree = hourDegree + 6;}if (hourDegree >= 360) { //一圈还是从0度开始hourDegree = 0;}}//画圆private void drawCircle(Canvas canvas) {Paint paint = new Paint();paint.setColor(Color.RED);paint.setStrokeWidth(2);canvas.drawCircle(CenterX,CenterY,Radius,paint);Paint paint2 = new Paint();paint2.setColor(Color.YELLOW);paint2.setStrokeWidth(15f);canvas.drawPoint(CenterX,CenterY,paint2);}private void drawClockPoint(Canvas canvas) {Paint paint = new Paint();paint.setColor(Color.YELLOW);paint.setStrokeWidth(10f);//画出闹钟上面的刻度值，一圈一共12个点, 360度for (float degree = 0; degree <= 330;degree = degree + 30) {//数学公式 找圆上面的点坐标float rad = (float )Math.toRadians(degree);//转换为度float x = (float) (Radius * Math.sin(rad));float y = (float) (Radius * Math.cos(rad));canvas.drawPoint(x + CenterX, CenterY - y,paint);}}//画指针,转的慢的指针越厚，默认都从0开始转private void drawIndicator(Canvas canvas) {Paint paint = new Paint();paint.setColor(Color.BLACK);paint.setStrokeWidth(3f);//秒针_drawLine(canvas,secondsDegree,paint);//分针paint.setColor(Color.DKGRAY);paint.setStrokeWidth(6f);_drawLine(canvas,minDegree,paint);//时针paint.setColor(Color.WHITE);paint.setStrokeWidth(12f);_drawLine(canvas,hourDegree,paint);}private void _drawLine(Canvas canvas,float degree,Paint paint) {float rad = (float )Math.toRadians(degree);//转换为度float x = (float) (Radius * Math.sin(rad));float y = (float) (Radius * Math.cos(rad));canvas.drawLine(CenterX, CenterY, x + CenterX, CenterY - y, paint);}public void setSchedualTime(long time) {Calendar cal = Calendar.getInstance();cal.setTimeInMillis(time);//演示一下int hour     = 14;int min      = 35;if (hour > 12) { //是24小时类型的hour = hour - 12;}//计算和前面一样setHourDegree = hour * 30;setMinDegree  = min * 6;setSchedual = true;}//和手机时间同步一下public void syncTime() {Calendar cal = Calendar.getInstance();int hour     = cal.get(Calendar.HOUR_OF_DAY);int min      = cal.get(Calendar.MINUTE);int second   = cal.get(Calendar.SECOND);Log.d("","Time Now Hour:" + hour + " Min:" + min + " second:" + second);if (hour > 12) { //是24小时类型的hour = hour - 12;}//计算弧度 每个步伐都是 60/360 = 6度,Hour 12/360 度hourDegree = hour * 30;minDegree  = min * 6;secondsDegree = second * 6;}}

总结
- 没有给钟表绘制数字，这个只是画文本比较简单
- 判断定时图片是否在圆内，做的比较简单没有花太多时间去找方法
- 如果要实现能拖分时指针的需要扩展ViewGroup

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Android自定义View绘制闹钟

Android自定义View绘制闹钟

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