Android转盘抽奖的简单实现

public class ZhuanPan2 extends View implements View.OnClickListener{    private Paint mPaint;    private int mwidth;    private int mpidding;    private boolean isstart=false;    private RotateAnimation mRotateAnimation;    private RectF mRectF;    private String[] waitext=new String[]{"苹果","橘子","香蕉","荔枝","榴莲","葡萄"};    private int[] colors=new int[]{Color.parseColor("#8EE5EE"),Color.parseColor("#FFD700"),Color.parseColor("#8EE5EE"),Color.parseColor("#FFD700"),Color.parseColor("#8EE5EE"),Color.parseColor("#FFD700")};    private String neitext="start";    public ZhuanPan2(Context context) {        super(context);    }    public ZhuanPan2(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        mypiant();        myRotateAnimation();        setOnClickListener(this);    }    public ZhuanPan2(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    private void mypiant() {        mPaint=new Paint();        mPaint.setStrokeWidth(3);        mPaint.setAntiAlias(true);        mPaint.setColor(Color.WHITE);        mPaint.setStyle(Paint.Style.STROKE);    }    private void myRotateAnimation() {        mRotateAnimation=new RotateAnimation(0,360, Animation.RELATIVE_TO_SELF,0.5f, Animation.RELATIVE_TO_SELF,0.5f);        mRotateAnimation.setFillAfter(true);        mRotateAnimation.setRepeatCount(-1);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        setMeasuredDimension(300,300);        mwidth = getMeasuredWidth();        mpidding=5;        mRectF=new RectF(0,0,mwidth,mwidth);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawCircle(mwidth/2,mwidth/2,mwidth/2-mpidding,mPaint);        mPaint.setStyle(Paint.Style.FILL);        inityuan(canvas);        mPaint.setColor(Color.RED);        mPaint.setStyle(Paint.Style.FILL);        canvas.drawCircle(mwidth/2,mwidth/2,50,mPaint);        mPaint.setColor(Color.WHITE);        mPaint.setTextSize(24);        Rect rect=new Rect();        mPaint.getTextBounds(neitext,0,neitext.length(),rect);        int width = rect.width();        int height = rect.height();        canvas.drawText(neitext,mwidth/2-25+25-width/2,mwidth/2+height/2,mPaint);    }    private void inityuan(Canvas canvas) {        for (int i=0;i<6;i++){            mPaint.setColor(colors[i]);            canvas.drawArc(mRectF,(i-1)*60+60,60,true,mPaint);        }        for (int i=0;i<6;i++){            mPaint.setColor(Color.BLACK);            Path path=new Path();            path.addArc(mRectF,(i-1)*60+60,60);            canvas.drawTextOnPath(waitext[i],path,60,60,mPaint);        }    }    @Override    public void onClick(View v) {        if (!isstart){            isstart=true;            mRotateAnimation.setDuration(1000);            mRotateAnimation.setInterpolator(new LinearInterpolator());            startAnimation(mRotateAnimation);        }else {            isstart=false;            clearAnimation();        }    }}

然后写好这个类之后只需在布局文件中设置就行,把宽高设置成自适应否则会出现转盘控件围绕布局公转

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