Android实现无限循环滚动弹幕的代码示例

//为展示在屏幕上的弹幕数据 private val mDanMuList = LinkedList<BulletChatDetail>()
//屏幕中展示的弹幕数据 private val mVisibleDanMuList = LinkedList<BulletChatDetail>()
fun enqueueDanMuList(danMuList: List<BulletChatDetail>?) {
    danMuList?.forEach {         
	if (this.mDanMuList.contains(it).not()) {
            this.mDanMuList.add(it)
        }
    }    
	if (mWidth == 0) {
        viewTreeObserver.addOnGlobalLayoutListener(object :
                ViewTreeObserver.OnGlobalLayoutListener {
            override fun onGlobalLayout() {
                mWidth = measuredWidth                
				viewTreeObserver.removeOnGlobalLayoutListener(this)

                if (mIsRunning.get().not()) {
                    mDanMuList.poll()?.apply {                       
					//这里是用来处理布局的交替工作，前面分析有说明                         					                           mVisibleDanMuList.add(this)
                        createDanMuItemView(this)
                    }                
				}
            }
        })
    } else {
        if (mIsRunning.get().not()) {
            mDanMuList.poll()?.apply {                 
			//这里是用来处理布局的交替工作，前面分析有说明                 
			mVisibleDanMuList.add(this)
            createDanMuItemView(this)
            }        
			}
    }
}

class DanMuItemView @JvmOverloads constructor(
        context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : LinearLayoutCompat(context, attrs, defStyleAttr) {

    var danMu: BulletChatDetail? = null     
	private val mBinding: DanmuItemBinding      
	init {
        mBinding = DanmuItemBinding.inflate(
                LayoutInflater.from(context), this, true         )
    }

    fun setDanMuEntity(danmu: BulletChatDetail?) {
        this.danMu = danmu
        mBinding.tvDanMuItem.text = danmu?.bulletChat            	  	 mBinding.ivDanMuItem.setCircleImageUrl(danmu?.userLogo?.toCompleteImageUrl(3))
        measure(0, 0)
    }
}

private fun createDanMuItemView(DanMu: BulletChatDetail) {
    val danMuItemView = DanMuItemView(context).apply {         
	setDanMuEntity(DanMu)
    }     //这里将布局添加之后，默认便宜到屏幕右侧出屏幕，造成布局总是从右👉移动到👈左的效果。    
	val param = LayoutParams(danMuItemView.measuredWidth, danMuItemView.measuredHeight)
    param.gravity = Gravity.CENTER_VERTICAL    
	param.leftMargin = mWidth     
	startDanMuAnimate(danMuItemView)
    addView(danMuItemView, param)
}

val targetSpeedPxPerSecond = 120.0f // 你想要的目标速度，单位是像素每秒 
val totalTranslateX = ((mWidth + danMuItemView.measuredWidth)).toFloat()
val duration = (totalTranslateX / targetSpeedPxPerSecond * 1000).toLong() // 转换为毫秒
var isInit = false 
danMuItemView.animate()
       //注意这边设置的便宜量是容器布局的宽度+弹幕item布局的宽度，这样就确保滚动值刚好是从屏幕右侧外到屏幕左侧外         .translationXBy(-totalTranslateX)
        .setDuration(duration)
        .setInterpolator(LinearInterpolator())
        .setUpdateListener {              
		val danMuTranslateX =(mWidth + danMuItemView.measuredWidth) * (it.animatedValue as Float)
        //这里是关键，用来确保每个item布局的间距一致，判断如果滚动进入屏幕的距离刚好是自身+20dp，也就是刚好空出来了20dp之后，紧接着下一个弹幕布局开始添加并动起来。             
			if (danMuTranslateX >= danMuItemView.measuredWidth +
                    DensityUtils.dp2px(15f) && isInit.not()) {
                isInit = true                
				if (mDanMuList.size == 0) {
                    mHasStopRun = true                 
					}else{
                    mHasStopRun = false                    
					mDanMuList.poll()?.apply {                     
					mVisibleDanMuList.add(this)
                        createDanMuItemView(this)
                    }                
				}
            }
        }         
		.setListener(object : AnimatorListenerAdapter() {
            override fun onAnimationEnd(animation: Animator) {
                super.onAnimationEnd(animation)
                if (mIsRunning.get().not()) {
                    mIsRunning.set(true)
                }
                //很重要，在动画结束，也就是布局从屏幕移除之后，切记从布局中移除掉，                 
				//并且进行一波数据交替，方便实现无线循环                
				danMuItemView.danMu?.let {                    
				mVisibleDanMuList.remove(it)
                    mDanMuList.add(it)
                }                
				YzLog.e("mHasStopRun->>>>${mHasStopRun}")
                if (mHasStopRun) {
                    createDanMu()
                }else{
                    removeView(danMuItemView)
                }
            }
        }).start()