代码实现

自定义控件的代码：

public class ClockView extends View{ private Paint circlePaint,dialPaint,numberPaint; //view 的宽高 private float mWidth,mHeight; //圆的半径 private float circleRadius; //圆心X,Y坐标 private float circleX,circleY; private int second,minute; private double hour; private Handler handler = new Handler(Looper.getMainLooper()){  @Override  public void handleMessage(Message msg) {   super.handleMessage(msg);   if(msg.what==0){    invalidate();   }  } }; public ClockView(Context context, AttributeSet attrs) {  super(context, attrs);  initPaint(); } private void initPaint(){  //刻盘圆，小时刻度，时针和分针的画笔  circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);  circlePaint.setColor(Color.BLACK);  circlePaint.setStyle(Paint.Style.STROKE);  circlePaint.setStrokeWidth(10);  //分钟刻度的画笔  dialPaint = new Paint(Paint.ANTI_ALIAS_FLAG);  dialPaint.setColor(Color.BLACK);  dialPaint.setStrokeWidth(5);  //数字的画笔  numberPaint = new Paint(Paint.ANTI_ALIAS_FLAG);  numberPaint.setColor(Color.BLACK);  numberPaint.setStrokeWidth(5);  numberPaint.setTextSize(30); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  super.onMeasure(widthMeasureSpec, heightMeasureSpec);  mWidth = getMeasuredWidth();  mHeight = getMeasuredHeight();  if(mWidth

public class Point { private float x; private float y;

public Point(float x, float y) { this.x = x; this.y = y;}public float getX() { return x;}public void setX(float x) { this.x = x;}public float getY() { return y;}public void setY(float y) { this.y = y;}

Acitivity：

public class ClockActivity extends Activity{  private ClockView clockView;  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.clock_layout);   clockView = (ClockView) findViewById(R.id.clock);  }  @Override  protected void onResume() {   super.onResume();   clockView.startClock();  }  @Override  protected void onStop() {   super.onStop();   clockView.stopClock();  } }

xml布局：