Android自定义View实现箭头沿圆转动实例代码

//MyCircleView类
public class MyCircleView extends View{
 //当前画笔画圆的颜色
 private int CurrenCircleBoundColor;
 private Paint paint;
 ////从xml中获取的颜色
 private int circleBundColor;
 private float circleBoundWidth;
 private float pivotX;
 private float pivotY;
 private float radius=130;
 private float currentDegree=0;
 private int currentSpeed=1;
 private boolean isPause=false;
 public MyCircleView(Context context) {
  super(context);
  initView(context);
 }
 public MyCircleView(Context context, @Nullable AttributeSet attrs) {
  super(context, attrs);
  initView(context);
  TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyCircleView);
  for (int i = 0; i =10){
   currentSpeed=10;
   Toast.makeText(getContext(),"我比闪电还快",Toast.LENGTH_SHORT).show();
  }
 }
 public void slowDown(){
  --currentSpeed;
  if (currentSpeed<=1){
   currentSpeed=1;
  }
 }
 public void pauseOrStart(){
  //如果是开始状态的话去重新绘制
  if (isPause){
   isPause=!isPause;
   invalidate();
  }else {
   isPause=!isPause;
  }
 }
}
//主页面
public class MainActivity extends AppCompatActivity {
 //全局变量
 private MyCircleView my_view;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  //找控件
  my_view = (MyCircleView) findViewById(R.id.my_view);
 }
 public void onClick(View view){
  my_view.setColor(Color.BLUE);
 }
 public void add(View view){
  my_view.speed();
 }
 public void slow(View view){
  my_view.slowDown();
 }
 public void pauseOrStart(View view){
  my_view.pauseOrStart();
 }
}
主页面布局

 
 
 
 
  

//在values建一个attrs.xml