Question

我正在由VideoView和Slider组成的Android应用程序上设置一个Activity。我尝试根据视频的进度在下面滚动文本。

我的解决方案之所以奏效，是因为有一个Thread根据视频的进度更改了所选幻灯片。

我想添加一项改进，以根据用户选择的幻灯片更改视频的进度。

几乎可以使用。在用户滑动文本的那一刻，视频可以很好地前进直到所需的时间。但是线程并行运行出现问题，它会立即替换文本和视频进度。

这是我的代码的一部分（还是草稿）：

abstract class VideoStepActivity : AppCompatActivity() {

    companion object {
        const val PAUSE_TIME_BETWEEN_ACQUISITIONS: Long = 300
    }

    private lateinit var mViewPager: CustomViewPager
    private var mIsRunning: Boolean = true
    private var mCurrentStepKey: Int = -1
    protected abstract val stepNumber: Int
    private lateinit var myVideoView: VideoView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        this.setContentView(R.layout.activity_video_step)
    }

    protected fun setUpStepResources(videoFileId: Int, stepStringArray: List<Step>) {

        val videoPath = "android.resource://${this.packageName}/" + videoFileId
        this.myVideoView = this.findViewById(R.id.myVideoView) as VideoView
        val mediaController = MediaController(this)
        val uri: Uri = Uri.parse(videoPath)
        this.myVideoView.setVideoURI(uri)
        this.myVideoView.setMediaController(mediaController)
        mediaController.setAnchorView(this.myVideoView)

        this.mViewPager = this.findViewById(R.id.pager)
        val pagerAdapter = this.ScreenSlidePagerAdapter(this.supportFragmentManager, stepStringArray)
        this.mViewPager.adapter = pagerAdapter

        this.setUpVideoStep(stepStringArray)
        stepChecker(0, stepStringArray)
    }



    private fun setUpVideoStep(stepStringArray: List<Step>) {

        this.myVideoView.setOnPreparedListener { mediaPlayer ->

            mediaPlayer.isLooping = true
            mediaPlayer.start()
            this.mIsRunning = true
            val duration = this.myVideoView.duration

            this.mViewPager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {

                override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {}

                override fun onPageSelected(position: Int) {
                    this@VideoStepActivity.mCurrentStepKey = position
                    this@VideoStepActivity.myVideoView.seekTo(stepStringArray[position].startTime)
                }

                override fun onPageScrollStateChanged(state: Int) {}

            })

            Thread(Runnable {

                do {
                    this.mViewPager.post {
                        val time = this.myVideoView.currentPosition / 1000
                        this.stepChecker(time, stepStringArray)
                    }
                    Thread.sleep(PAUSE_TIME_BETWEEN_ACQUISITIONS)
                } while (this.mIsRunning)
            }).start()
        }
    }

    private fun stepChecker(time: Int, stepStringArray: List<Step>) {
        for (step: Step in stepStringArray) {
            if (step.currentTimeIsInRange(time)) {
                if (this.mCurrentStepKey != step.stepKey) {
                    this.mViewPager.currentItem = step.stepKey
                    this.mCurrentStepKey = step.stepKey
                }
            }
        }
    }

    public override fun onDestroy() {
        this.mIsRunning = false
        super.onDestroy()
    }


    private inner class ScreenSlidePagerAdapter(fragmentManager: FragmentManager, private var stepStringArray: List<Step>) : FragmentStatePagerAdapter(fragmentManager) {

        override fun getCount(): Int = this@VideoStepActivity.stepNumber

        override fun getItem(position: Int): Fragment = ScreenSlidePageFragment(this.stepStringArray[position].stepString)
    }


    inner class Step(val stepString: String, val startTime: Int, private val endTime: Int, val stepKey: Int) {

        fun currentTimeIsInRange(time: Int): Boolean {
            return time in startTime..(endTime - 1)
        }

    }

}

我有一个与时间相关的文本列表。在其他线程中，每300毫秒，我检查一次视频范围是否可以更改滑块的选定元素。

我尝试使用以下选项根据滑块的选定元素来更改视频的进度：带有onPageSelected的ViewPager.OnPageChangeListener。

您对我的问题有任何解决方案或改进措施吗？

根据选定的滑块（以及相反的滑块）在videoView中定位

0 个答案: