Android如何实现水波纹效果

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效果图

attrs.xml

自定义属性

RippleAnimationView.java

管理水波纹属性以及动画状态

public class RippleAnimationView extends RelativeLayout {    private Paint paint;    private int radius;    private int strokeWidth;    private int rippleColor;    private AnimatorSet animatorSet;    public RippleAnimationView(Context context) {        this(context, null);    }    public RippleAnimationView(Context context, @Nullable AttributeSet attrs) {        this(context, attrs, 0);    }    public RippleAnimationView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context, attrs);    }    private void init(Context context, AttributeSet attrs) {        paint = new Paint();        paint.setAntiAlias(true);        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.RippleAnimationView);        // 水波纹填充类型        int rippleType = array.getInt(R.styleable.RippleAnimationView_ripple_anim_type, 0);        radius = array.getInteger(R.styleable.RippleAnimationView_radius, 54);        strokeWidth = array.getInteger(R.styleable.RippleAnimationView_stroeWidth, 2);        rippleColor = array.getColor(R.styleable.RippleAnimationView_ripple_anim_color, ContextCompat.getColor(context,                R.color.colorAccent));        array.recycle();        // 设置画笔线宽        paint.setStrokeWidth(UIUtils.getInstance().getWidth(strokeWidth));        if (rippleType == 0) {            paint.setStyle(Paint.Style.FILL);        } else {            paint.setStyle(Paint.Style.STROKE);        }        paint.setColor(rippleColor);        LayoutParams params = new LayoutParams(                UIUtils.getInstance().getWidth(radius + strokeWidth),                UIUtils.getInstance().getWidth(radius + strokeWidth));        params.addRule(CENTER_IN_PARENT, TRUE);        // 缩放系数        float maxScale =   UIUtils.getInstance().displayMetricsWidth / (2 * UIUtils.getInstance().getWidth(                radius + strokeWidth        ));        // 延迟时间        int rippleDuration = 3500;        int singleDelay = rippleDuration / 4; // 时间间隔        // 动画集合        List animatorList = new ArrayList<>();        // 实例化水波纹view        for (int i = 0;i<4;i++){            RippleCircleView rippleCircleView = new RippleCircleView(this);            addView(rippleCircleView,params);            // 添加水波纹到集合            viewList.add(rippleCircleView);            // 初始化属性动画            // x            ObjectAnimator scaleXAnimator = ObjectAnimator.ofFloat(rippleCircleView,"ScaleX",                    1.0f,maxScale);            scaleXAnimator.setRepeatCount(ObjectAnimator.INFINITE);// 无限循环            scaleXAnimator.setRepeatMode(ObjectAnimator.RESTART);            scaleXAnimator.setStartDelay(i*singleDelay);            scaleXAnimator.setDuration(rippleDuration);            animatorList.add(scaleXAnimator);            // y            ObjectAnimator scaleYAnimator = ObjectAnimator.ofFloat(rippleCircleView,"ScaleY",                    1.0f,maxScale);            scaleYAnimator.setRepeatCount(ObjectAnimator.INFINITE);// 无限循环            scaleYAnimator.setRepeatMode(ObjectAnimator.RESTART);            scaleYAnimator.setStartDelay(i*singleDelay);            scaleYAnimator.setDuration(rippleDuration);            animatorList.add(scaleYAnimator);            // alpha            ObjectAnimator alphaAnimator = ObjectAnimator.ofFloat(rippleCircleView,"Alpha",                    1.0f,0f);            alphaAnimator.setRepeatCount(ObjectAnimator.INFINITE);// 无限循环            alphaAnimator.setRepeatMode(ObjectAnimator.RESTART);            alphaAnimator.setStartDelay(i*singleDelay);            alphaAnimator.setDuration(rippleDuration);            animatorList.add(alphaAnimator);        }        animatorSet = new AnimatorSet();        animatorSet.setInterpolator(new AccelerateDecelerateInterpolator()); // 差值器:先加速，后减速        animatorSet.playTogether(animatorList);    }    private boolean animationRunning;    private List viewList = new ArrayList<>();    /**     * 开启动画     */    public void startRippleAnimation(){        if (!animationRunning){            for (RippleCircleView  rippleCircleView: viewList) {                rippleCircleView.setVisibility(VISIBLE);            }            animatorSet.start();            animationRunning = true;        }    }    /**     *  结束动画     */    public void stopRippleAnimation(){        if (animationRunning){            // 逆序播放（从外向内播放动画）            Collections.reverse(viewList);            for (RippleCircleView  rippleCircleView: viewList) {                rippleCircleView.setVisibility(INVISIBLE);            }            animatorSet.end();            animationRunning = false;        }    }    public int getStrokeWidth() {        return strokeWidth;    }    public Paint getPaint() {        return paint;    }    public boolean isAnimationRunning() {        return animationRunning;    }}

RippleCircleView.java

绘制水波纹

public class RippleCircleView extends View {    private RippleAnimationView rippleAnimationView;    public RippleCircleView(RippleAnimationView rippleAnimationView) {        this(rippleAnimationView.getContext(),null);        this.rippleAnimationView = rippleAnimationView;        // 一开始隐藏        this.setVisibility(INVISIBLE);    }    public RippleCircleView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    public RippleCircleView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onDraw(Canvas canvas) {        int radius = Math.min(getWidth(),getHeight()) / 2;        // 画圆        canvas.drawCircle(radius,radius,radius - rippleAnimationView.getStrokeWidth(),                rippleAnimationView.getPaint());    }}

使用水波纹动画

 RippleAnimationView rippleAnimationView = findViewById(R.id.ripple_view);        findViewById(R.id.iv_play)                .setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        if (rippleAnimationView.isAnimationRunning()) {                            rippleAnimationView.stopRippleAnimation();                        } else {                            rippleAnimationView.startRippleAnimation();                        }                    }                });

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