Android 自定义view 实现转盘抽奖

实现效果:

布局文件

新建一个class继承View:

public class ChoujiangView extends View implements View.OnClickListener{

    private int screenWidth;
    private int screenHight;
    private int centerX;
    private int centerY;
    private Paint paint;
    private int[] colors;
    private String[] desc = new String[]{"性感", "丰满", "知性", "聪明", "贤惠", "优秀"};
    private boolean isRote;//是否在旋转

    public ChoujiangView(Context context) {
        this(context, null);
    }

    public ChoujiangView(Context context, AttributeSet attrs) {
        this(context, attrs, -1);
    }

    public ChoujiangView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        //获取屏幕宽高信息
        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
        screenWidth = displayMetrics.widthPixels;
        screenHight = displayMetrics.heightPixels;

        //获取屏幕中心坐标
        centerX = screenWidth / 2;
        centerY = screenHight / 2;

        //初始化画笔
        initPaint();
        //颜色
        colors = new int[]{Color.RED, Color.GRAY, Color.YELLOW, Color.BLUE, Color.GREEN, Color.LTGRAY};

        this.setOnClickListener(this);
    }

    //测量
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        setMeasuredDimension(100, 100);
    }

    //绘图
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.translate(centerX, centerY);

        //绘制6个圆弧
        RectF rect = new RectF(-300, -300, 300, 300);
        float start = 60;
        for (int i = 0; i < 6; i++) {
            paint.setColor(colors[i]);
            canvas.drawArc(rect, start * i, 60, true, paint);
        }

        //绘制中心的圆
        paint.setColor(Color.RED);
        canvas.drawCircle(0, 0, 100, paint);

        paint.setColor(Color.WHITE);
        paint.setTextSize(40);

        //获取文字宽度和高度
        Rect rectText = new Rect();
        paint.getTextBounds("start", 0, 5, rectText);
        int width = rectText.width();
        int height = rectText.height();
        canvas.drawText("start", -width / 2, height / 2, paint);

        //绘制描述信息
        RectF rectF = new RectF(-200, -200, 200, 200);
        for (int i = 0; i < 6; i++) {
            paint.setColor(Color.WHITE);
            Path path = new Path();
            path.addArc(rectF, start * i+15 , 60);
            canvas.drawTextOnPath(desc[i], path, 0, 0, paint);
        }
    }

    //初始化画笔
    private void initPaint() {
        paint = new Paint();
        paint.setColor(Color.RED);
        paint.setStrokeWidth(20);
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.FILL);
    }

    @Override
    public void onClick(View v) {
        if (!isRote){
            startAnima();
        }
    }

    private void startAnima() {
        isRote = true;
        RotateAnimation rotateAnimation;
        double random = Math.random();
        rotateAnimation = new RotateAnimation(0, (float) (720*random),centerX,centerY);
        rotateAnimation.setDuration(800);
        rotateAnimation.setFillAfter(true);
        //设置重复的次数
        rotateAnimation.setInterpolator(new LinearInterpolator());
        //设置重复的模式
        rotateAnimation.setRepeatMode(Animation.RESTART);

        //给动画添加监听
        rotateAnimation.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {

            }

            @Override
            public void onAnimationEnd(Animation animation) {
                isRote = false;
            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }
        });

        startAnimation(rotateAnimation);

    }
    private void setRoundDom(){
        double random = Math.random();
        RotateAnimation rotateAnimation2 = new RotateAnimation(0, (float) (360*random),centerX,centerY);
        rotateAnimation2.setDuration(100);
        rotateAnimation2.setFillAfter(true);
        startAnimation(rotateAnimation2);

    }
}