AnalogClock

  针对Android底层View的直接构造很多网友没有实战经验，本次Android开发网结合目前平台开源代码一起通过AnalogClock类来理解View的直接继承。AnalogClock就是Home Screen上的那个带有两根指针的表盘类。它的实现我们直接从开源代码可以了解到:   public class AnalogClock extends View {    private Time mCalendar;     private Drawable mHourHand; //时针    private Drawable mMinuteHand; //分针    private Drawable mDial; //表盘背景     private int mDialWidth; //表盘宽度    private int mDialHeight; //表盘高度     private boolean mAttached; //附着状态     private final Handler mHandler = new Handler(); //定一个Handler类实现更新时间    private float mMinutes;    private float mHour;    private boolean mChanged; […]