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用途

支持对任何视图进行包裹后3D翻转.

效果图

主要代码

class ThreeDLayout(context: Context?, attrs: AttributeSet? = null) : ViewGroup(context, attrs) {
       private val mCamera: Camera    private val mMatrix: Matrix    //this viewgroup's center    private var mCenterX = 0    private var mCenterY = 0    //rotateDegree    private var mCanvasRotateY = 0f    private var mCanvasRotateX = 0f    private var mCanvasMaxRotateDegree = 50f    private var mMode = MODE_BOTH_X_Y    private val mDensity: Float    private val mValues = FloatArray(9)    //the flag of touch    private var isCanTouch = false    //the degree of animation    private var mDegreeY = 0f    private var mDegreeX = 0f    //the flag of animate    private var isPlaying = false    //the degree of longer animate    private var mLoopAnimateY = 0    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
           check(childCount == 1) {
    "ThreeDLayout can only have one child" }        val child = getChildAt(0)        measureChild(child, widthMeasureSpec, heightMeasureSpec)        //only one child view,so give the same size        setMeasuredDimension(child.measuredWidth, child.measuredHeight)    }    override fun onLayout(        changed: Boolean,        l: Int,        t: Int,        r: Int,        b: Int    ) {
           val child = getChildAt(0)        child.layout(0, 0, child.measuredWidth, child.measuredHeight)    }    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
           super.onSizeChanged(w, h, oldw, oldh)        mCenterX = w / 2        mCenterY = h / 2    }    override fun onDraw(canvas: Canvas) {
           mMatrix.reset()        mCamera.save()        if (mMode == MODE_Y || mMode == MODE_BOTH_X_Y) {
               mCamera.rotateX(mCanvasRotateX)        }        if (mMode == MODE_X || mMode == MODE_BOTH_X_Y) {
               mCamera.rotateY(mCanvasRotateY)        }        mCamera.rotateY(mDegreeY)        mCamera.rotateX(mDegreeX)        if (isPlaying) {
               mCamera.rotateY(mLoopAnimateY++.toFloat())            if (mLoopAnimateY == 360) {
                   mLoopAnimateY = 0            }            invalidate()        }        mCamera.getMatrix(mMatrix)        // fix the Camera bug,        mMatrix.getValues(mValues)        mValues[6] = mValues[6] / mDensity        mValues[7] = mValues[7] / mDensity        mMatrix.setValues(mValues)        mCamera.restore()        mMatrix.preTranslate(-mCenterX.toFloat(), -mCenterY.toFloat())        mMatrix.postTranslate(mCenterX.toFloat(), mCenterY.toFloat())        canvas.concat(mMatrix)        super.onDraw(canvas)    }    override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {
           return if (isCanTouch) {
               true        } else {
               super.onInterceptTouchEvent(ev)        }    }    override fun onTouchEvent(event: MotionEvent): Boolean {
           return if (isCanTouch) {
               val x = event.x            val y = event.y            when (event.action) {
                   MotionEvent.ACTION_MOVE -> {
                       rotateCanvasWhenMove(x, y)                    invalidate()                    return true                }                MotionEvent.ACTION_UP -> {
                       mDegreeY = 0f                    rotateCanvasWhenMove(mCenterX.toFloat(), mCenterY.toFloat())                    invalidate()                    return true                }            }            true        } else {
               super.onTouchEvent(event)        }    }    /**     * get the value to rotate     */    private fun rotateCanvasWhenMove(x: Float, y: Float) {
           val dx = x - mCenterX        val dy = y - mCenterY        var percentX = dx / mCenterX        var percentY = dy / mCenterY        if (percentX > 1f) {
               percentX = 1f        } else if (percentX < -1f) {
               percentX = -1f        }        if (percentY > 1f) {
               percentY = 1f        } else if (percentY < -1f) {
               percentY = -1f        }        mCanvasRotateY = mCanvasMaxRotateDegree * percentX        mCanvasRotateX = -(mCanvasMaxRotateDegree * percentY)    }    fun setTouchable(canTouch: Boolean) {
           isCanTouch = canTouch    }    fun setTouchMode(mode: Int) {
           mMode = mode        isCanTouch = true    }    /**     * set the max rotate degree     */    fun setMaxRotateDegree(degree: Int) {
           mCanvasMaxRotateDegree = degree.toFloat()    }    /**     * start horizontal turn animate     */    fun startHorizontalAnimate(duration: Long) {
           val animator = ValueAnimator.ofFloat(-180f, 0f)        animator.addUpdateListener {
    animation ->            mDegreeY = animation.animatedValue as Float            invalidate()        }        animator.addListener(object : Animator.AnimatorListener {
               override fun onAnimationStart(animation: Animator) {
   }            override fun onAnimationEnd(animation: Animator) {
                   mDegreeY = 0f                animator.removeAllUpdateListeners()            }            override fun onAnimationCancel(animation: Animator) {
   }            override fun onAnimationRepeat(animation: Animator) {
   }        })        animator.duration = duration        animator.start()    }    /**     * start horizontal turn animate delayed     */    fun startHorizontalAnimateDelayed(delayed: Long, duration: Long) {
           Thread(Runnable {
               try {
                   Thread.sleep(delayed)            } catch (e: InterruptedException) {
                   e.printStackTrace()            }            post {
    startHorizontalAnimate(duration) }        }).start()    }    /**     * start vertical turn animate     */    fun startVerticalAnimate(duration: Long) {
           val animator = ValueAnimator.ofFloat(-180f, 0f)        animator.addUpdateListener {
    animation ->            mDegreeX = animation.animatedValue as Float            invalidate()        }        animator.addListener(object : Animator.AnimatorListener {
               override fun onAnimationStart(animation: Animator) {
   }            override fun onAnimationEnd(animation: Animator) {
                   mDegreeX = 0f                animator.removeAllUpdateListeners()            }            override fun onAnimationCancel(animation: Animator) {
   }            override fun onAnimationRepeat(animation: Animator) {
   }        })        animator.duration = duration        animator.start()    }    /**     * start vertical turn animate delayed     */    fun startVerticalAnimateDelayed(delayed: Long, duration: Long) {
           Thread(Runnable {
               try {
                   Thread.sleep(delayed)            } catch (e: InterruptedException) {
                   e.printStackTrace()            }            post {
    startVerticalAnimate(duration) }        }).start()    }    /**     * start loop animate     */    fun startHorizontalAnimate() {
           isPlaying = true        invalidate()    }    /**     * stop the loop animate     */    fun stopAnimate() {
           isPlaying = false        mLoopAnimateY = 0        invalidate()    }    companion object {
           //the touch mode        var MODE_X = 0        var MODE_Y = 1        var MODE_BOTH_X_Y = 2    }    init {
           //set a default background to make sure onDraw() dispatch        if (background == null) {
               setBackgroundColor(Color.parseColor("#ffffff"))        }        var dm = DisplayMetrics()        dm = resources.displayMetrics        mDensity = dm.density        mCamera = Camera()        mMatrix = Matrix()    }}

完整源代码

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