Android 实现自定义圆环

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);//内圆的画笔颜色，默认 #ffffff mRvRingView.setRingStrokeWidth(40);//圆环的环宽，默认20 // mRvRingView.showViewWithAnimation(1000);//自定义动画时长展示圆环 // mRvRingView.showViewWithoutAnimation();//展示圆环不带动画 mRvRingView.showViewWithAnimation();//动画展示圆环，默认2s } }

3.自定义view的源码

public class RingView extends View {    
    private static final int CIRCLE_ANGLE = 360;//圆环的角度    
    private static final int RING_STROKE_WIDTH = 20;//默认圆环的宽度为20dp    
    private Paint mNoAssetsPaint, mInnerCirclePaint;    
    private ArrayList<Paint> mPaints;    
    private int mRingStrokeWidth;//圆环的宽度    
    private int mCanvasWidth, mCanvasHeight;    
    private RectF mRingRect, mInnerRect;    
    private int mDensity;//手机屏幕密度    
    private int mNoDataPaintColor = Color.parseColor("#cccccc");//没有数据的paint的颜色    
    private int mInnerCirclePaintColor = Color.parseColor("#ffffff");//内圆的paint的颜色    
    private ArrayList<Integer> mAngles;//传入的数据    
    private boolean mHasData = false;    
    private ArrayList<Integer> mLevelStartAngles;//每段圆弧的起始角度值    
    private int mMoveAngle;//圆弧移动的角度    
    private int mRingStartAngle = -90;//圆环的起始角度    
    private RingAnimation mRingAnim;    

    public RingView(Context context) {
        super(context);
        init(context);
    }

    public RingView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public RingView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    private void init(Context ctx) {
        mDensity = (int) ctx.getResources().getDisplayMetrics().density;
        mRingStrokeWidth = RING_STROKE_WIDTH * mDensity;
        mPaints = new ArrayList<Paint>();
        mAngles = new ArrayList<Integer>();
        mLevelStartAngles = new ArrayList<Integer>();
        mNoAssetsPaint = new Paint();
        mNoAssetsPaint.setAntiAlias(true);
        mNoAssetsPaint.setStyle(Paint.Style.FILL);
        mNoAssetsPaint.setColor(mNoDataPaintColor);
        mInnerCirclePaint = new Paint();
        mInnerCirclePaint.setAntiAlias(true);
        mInnerCirclePaint.setStyle(Paint.Style.FILL);
        mInnerCirclePaint.setColor(mInnerCirclePaintColor);
        mRingAnim = new RingAnimation();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (mCanvasWidth == 0) {
            initRect(); 
       } 
       if (!mHasData) {//没有数据
            mMoveAngle = CIRCLE_ANGLE; 
           drawRingView(canvas, mRingStartAngle, mMoveAngle, mNoAssetsPaint); 
       } else {
            int _level = 0;//圆弧的段数
            for

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