第一种使用背景表盘

主要代码：

package com.zjs.zidingyiview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;import java.util.Calendar;public class MyClock extends View {private Paint mPaint;private Calendar mCalendar;private int DEFAULT = 400;private int mSecond;private int mMinute;private int mHour;private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);mCalendar = Calendar.getInstance();mHour = mCalendar.get(Calendar.HOUR);mMinute = mCalendar.get(Calendar.MINUTE);mSecond = mCalendar.get(Calendar.SECOND);
//            获取时间后，重新绘制invalidate();mHandler.sendEmptyMessageDelayed(1234, 1000);}};private void init() {mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setColor(Color.BLACK);mPaint.setStyle(Paint.Style.STROKE);mHandler.sendEmptyMessageDelayed(123, 1000);}public MyClock(Context context) {super(context);init();}public MyClock(Context context, @Nullable AttributeSet attrs) {super(context, attrs);init();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int widthSize = MeasureSpec.getSize(widthMeasureSpec);int heightSize = MeasureSpec.getSize(heightMeasureSpec);int widthMode = MeasureSpec.getMode(widthMeasureSpec);int heightMode = MeasureSpec.getMode(heightMeasureSpec);switch (widthMode) {case MeasureSpec.AT_MOST:widthSize = DEFAULT;break;case MeasureSpec.EXACTLY:heightSize = widthSize;break;}switch (heightMode) {case MeasureSpec.AT_MOST:heightSize = DEFAULT;break;case MeasureSpec.EXACTLY:heightSize = widthSize;break;}setMeasuredDimension(widthSize, heightSize);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);
//        圆心mPaint.setStyle(Paint.Style.FILL);canvas.drawCircle(getWidth() / 2, getWidth() / 2, 8, mPaint);mPaint.setStyle(Paint.Style.STROKE);
//        绘制时针mPaint.setStrokeWidth(10);canvas.save();canvas.rotate((float) (360 / 12 * mHour + (mMinute * 0.5)), getWidth() / 2, getWidth() / 2);canvas.drawLine(getWidth() / 2, getWidth() / 2, getWidth() / 2, getWidth() / 2 - getWidth() / 5, mPaint);canvas.restore();
//         绘制分针mPaint.setStrokeWidth(8);canvas.save();canvas.rotate(360 / 60 * mMinute, getWidth() / 2, getWidth() / 2);canvas.drawLine(getWidth() / 2, getWidth() / 2, getWidth() / 2, getWidth() / 2 - getWidth() / 4, mPaint);canvas.restore();
//         绘制秒针mPaint.setStrokeWidth(6);canvas.save();canvas.rotate(360 / 60 * mSecond, getWidth() / 2, getWidth() / 2);canvas.drawLine(getWidth() / 2, getWidth() / 2, getWidth() / 2, getWidth() / 2 - getWidth() / 3, mPaint);canvas.restore()}
}

效果

自定义画表盘

package com.zjs.zidingyiview;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;import java.util.Calendar;public class MyClock extends View {private Paint mPaint;private Calendar mCalendar;private int DEFAULT = 400;private int mSecond;private int mMinute;private int mHour;private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);mCalendar = Calendar.getInstance();mHour = mCalendar.get(Calendar.HOUR);mMinute = mCalendar.get(Calendar.MINUTE);mSecond = mCalendar.get(Calendar.SECOND);
//            获取时间后，重新绘制invalidate();mHandler.sendEmptyMessageDelayed(1234, 1000);}};private void init() {mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setColor(Color.BLACK);mPaint.setStyle(Paint.Style.STROKE);mHandler.sendEmptyMessageDelayed(123, 1000);}public MyClock(Context context) {super(context);init();}public MyClock(Context context, @Nullable AttributeSet attrs) {super(context, attrs);init();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int widthSize = MeasureSpec.getSize(widthMeasureSpec);int heightSize = MeasureSpec.getSize(heightMeasureSpec);int widthMode = MeasureSpec.getMode(widthMeasureSpec);int heightMode = MeasureSpec.getMode(heightMeasureSpec);switch (widthMode) {case MeasureSpec.AT_MOST:widthSize = DEFAULT;break;case MeasureSpec.EXACTLY:heightSize = widthSize;break;}switch (heightMode) {case MeasureSpec.AT_MOST:heightSize = DEFAULT;break;case MeasureSpec.EXACTLY:heightSize = widthSize;break;}setMeasuredDimension(widthSize, heightSize);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);mPaint.setStrokeWidth(8);
//        外圆canvas.drawCircle(getWidth() / 2, getWidth() / 2, getWidth() / 2 - 10, mPaint);mPaint.setStrokeWidth(8);
//        内圆canvas.drawCircle(getWidth() / 2, getWidth() / 2, (getWidth() / 2) - 30, mPaint);
//        圆心mPaint.setStyle(Paint.Style.FILL);canvas.drawCircle(getWidth() / 2, getWidth() / 2, 8, mPaint);
//        刻度
//        保留 画布中已经存在的位置信息canvas.save();for (int i = 0; i < 12; i++) {canvas.rotate(360 / 12, getWidth() / 2, getWidth() / 2);canvas.drawLine(getWidth() / 2, 20, getWidth() / 2, 40, mPaint);}
//        将画布恢复canvas.restore();mPaint.setStyle(Paint.Style.STROKE);
//        绘制时针mPaint.setStrokeWidth(10);canvas.save();canvas.rotate((float) (360 / 12 * mHour + (mMinute * 0.5)), getWidth() / 2, getWidth() / 2);canvas.drawLine(getWidth() / 2, getWidth() / 2, getWidth() / 2, getWidth() / 2 - getWidth() / 5, mPaint);canvas.restore();
//         绘制分针mPaint.setStrokeWidth(8);canvas.save();canvas.rotate(360 / 60 * mMinute, getWidth() / 2, getWidth() / 2);canvas.drawLine(getWidth() / 2, getWidth() / 2, getWidth() / 2, getWidth() / 2 - getWidth() / 4, mPaint);canvas.restore();
//         绘制秒针mPaint.setStrokeWidth(6);canvas.save();canvas.rotate(360 / 60 * mSecond, getWidth() / 2, getWidth() / 2);canvas.drawLine(getWidth() / 2, getWidth() / 2, getWidth() / 2, getWidth() / 2 - getWidth() / 3, mPaint);canvas.restore();}
}

效果

背景表盘图片：