先看效果图（图片是gif，比较卡顿）：

通过调用postInvalidateDelayed()延时绘制的方法，可以实现以上图片中的延时效果，下面来看具体代码：

1、自定义View类：

public class MyProgressView extends View {    private Paint circlePaint;  //圆环的画笔    private Paint bgPaint;      //环背景的画笔    private RectF circleRectF;  //圆环依据的矩阵    private int ringRadius=50;     //环的半径    private int drawNums=60;   //绘制的次数，用来实现动画效果    private int totalAngle=360; //总共的角度    private int drawedAngle=0;  //已经绘制的角度    private float percentDraw=0;    //需要绘制的百分比    public MyProgressView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        init();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if(percentDraw==0)return;        //画圆环的背景色        canvas.drawArc(circleRectF,0,360,false,bgPaint);        if(drawedAngle

public class MainActivity extends AppCompatActivity {    private MyProgressView myProgressView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView(){        myProgressView=findViewById(R.id.progress);        myProgressView.setStyles(200,100,0.65f);        //myProgressView.setStyles(200,100, Color.BLUE,Color.parseColor("#E1FFFF"),0.65f);    }}

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