android studio 中的横向模式和视频视图

Question

我编写了一个程序，当我在手机上运行该程序时，就会开始播放视频。

现在，视频播放后，如果我将手机旋转到横向模式，我的应用程序也会旋转到横向模式，但视频从头开始播放，这对我来说是个问题。

package com.example.videoview

import android.net.Uri
import android.os.Bundle
import android.widget.MediaController
import androidx.appcompat.app.AppCompatActivity
import com.example.videoview.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    private var position = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        initVideoView()

    }

    private fun initVideoView() {

        val uri = Uri.parse("android.resource://$packageName/${R.raw.paris_video}")

        val controller = MediaController(this)

        binding.videoView.setMediaController(controller)

        binding.videoView.setVideoURI(uri)

        binding.videoView.start()

        binding.videoView.setOnPreparedListener {

            it.setOnVideoSizeChangedListener { _, _, _ ->

                controller.setAnchorView(binding.videoView)

            }

        }

    }

    override fun onSaveInstanceState(outState: Bundle) {

        super.onSaveInstanceState(outState)

        outState.putInt("position", binding.videoView.currentPosition)

    }

    override fun onRestoreInstanceState(savedInstanceState: Bundle) {

        super.onRestoreInstanceState(savedInstanceState)

        position = savedInstanceState.getInt("position")

        binding.videoView.seekTo(position)

    }

}

我编写了代码，当我将手机旋转到横向模式时，我的应用程序也旋转到横向模式，以便视频不会从一开始就播放，但我不知道为什么它不能正常工作。

    override fun onSaveInstanceState(outState: Bundle) {

        super.onSaveInstanceState(outState)

        outState.putInt("position", binding.videoView.currentPosition)

    }

    override fun onRestoreInstanceState(savedInstanceState: Bundle) {

        super.onRestoreInstanceState(savedInstanceState)

        position = savedInstanceState.getInt("position")

        binding.videoView.seekTo(position)

    }

Answer 1

您对 onSaveInstanceState 和 onRestoreInstanceState 的实现似乎是正确的。
但是，请检查方向改变后是否调用 onRestoreInstanceState。

    binding.videoView.setOnPreparedListener {
        it.setOnVideoSizeChangedListener { _, _, _ ->
            controller.setAnchorView(binding.videoView)
        }

        // Check if savedInstanceState is not null and contains position
        if (savedInstanceState != null && savedInstanceState.containsKey("position")) {
            position = savedInstanceState.getInt("position")
            binding.videoView.seekTo(position)
        }

        binding.videoView.start()
    }

将 binding.videoView.start() 移至 setOnPreparedListener 内。 检查是否savedInstanceState不为空并且包含该位置，然后在开始视频之前寻找保存的位置。