Android自定义View之圆环交替 等待效果

<?xml version="1.0" encoding="utf-8"?>
<resources>
    
    <attr name="firstColor" format="color"/>
    <attr name="secondColor" format="color"/>
    <attr name="circleWidth" format="dimension"/>
    <attr name="speed" format="integer"/>
    
    <declare-styleable name="CustomView">
        <attr name="firstColor" />
        <attr name="secondColor" />
        <attr name="circleWidth" />
        <attr name="speed" />
    </declare-styleable>
    
</resources>

public class MySelfCircleView extends View {
    
    /*
     * 第一圈颜色
     */
    int firstColor;
    /*
     * 第二圈颜色
     */
    int secondColor;
    /*
     * 圆的宽度
     */
    int circleWidth;
    /*
     * 速率
     */
    int speed;
    /*
     * 画笔
     */
    Paint mPaint;
    /*
     * 进度
     */
    int mProgress;
    /*
     * 是否切换标志
     */
    boolean isNext;
    
    public MySelfCircleView(Context context, AttributeSet attrs,
            int defStyleAttr) {
        super(context, attrs, defStyleAttr);  
        TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomView, defStyleAttr, 0);
        int n = typedArray.getIndexCount();
        for(int i=0; i<n; i++){
            int attr = typedArray.getIndex(i);
            switch (attr) {
                case R.styleable.CustomView_firstColor:
                    firstColor = typedArray.getColor(attr, Color.RED);
                    break;
                case R.styleable.CustomView_secondColor:
                    secondColor = typedArray.getColor(attr, Color.RED);
                    break;
                case R.styleable.CustomView_circleWidth:
                    circleWidth = typedArray.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(  
                            TypedValue.COMPLEX_UNIT_PX, 20, getResources().getDisplayMetrics())); 
                    break;
                case R.styleable.CustomView_speed:
                    speed = typedArray.getInt(attr, 20);
                    break;
            }
        }
        typedArray.recycle();
        
        mPaint = new Paint();
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    mProgress++;
                    if (mProgress == 360) {  
                        mProgress = 0;  
                        if (!isNext)  
                            isNext = true;  
                        else  
                            isNext = false;  
                    }  
                    postInvalidate();  
                    try {  
                        Thread.sleep(speed);  
                    } catch (InterruptedException e) {  
                        e.printStackTrace();  
                    }  
                }
            }
        }).start();
    }

    public MySelfCircleView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MySelfCircleView(Context context) {
        this(context, null);
    }
    
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int centre = getWidth() / 2; // 获取圆心的x坐标  
        int radius = centre - circleWidth / 2;// 半径  
        mPaint.setStrokeWidth(circleWidth); // 设置圆环的宽度  
        mPaint.setAntiAlias(true); // 消除锯齿  
        mPaint.setStyle(Paint.Style.STROKE); // 设置空心  
        RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius); // 用于定义的圆弧的形状和大小的界限  
        if (!isNext) {// 第一颜色的圈完整，第二颜色跑  
            mPaint.setColor(firstColor); // 设置圆环的颜色  
            canvas.drawCircle(centre, centre, radius, mPaint); // 画出圆环  
            mPaint.setColor(secondColor); // 设置圆环的颜色  
            canvas.drawArc(oval, -90, mProgress, false, mPaint); // 根据进度画圆弧  
        } else {  
            mPaint.setColor(secondColor); // 设置圆环的颜色  
            canvas.drawCircle(centre, centre, radius, mPaint); // 画出圆环  
            mPaint.setColor(firstColor); // 设置圆环的颜色  
            canvas.drawArc(oval, -90, mProgress, false, mPaint); // 根据进度画圆弧  
        }
    }
    
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:zhy="http://schemas.android.com/apk/res/com.example.myselfview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    
    <com.example.myselfview.view.MySelfCircleView 
        android:layout_width="120dp"
        android:layout_height="120dp"
        android:layout_marginTop="20dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        zhy:circleWidth="15dp"
        zhy:firstColor="#D4F668"
        zhy:secondColor="#2F9DD2"
        zhy:speed="10" /> 
  
    <com.example.myselfview.view.MySelfCircleView 
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        zhy:circleWidth="24dp"
        android:layout_marginBottom="40dp"
        zhy:firstColor="#16A3FA"
        zhy:secondColor="#D20F02"
        zhy:speed="5" />  
  
</RelativeLayout>