如何将视频 Link 从 activity 传递到另一个 activity？

Question

我想将视频 link（字符串）从 activity 传递到 Android 中的另一个。我使用 button.setOnClickListener 并将字符串作为 intent.putextra 传递。在第二个 activity 中，我使用 intent.getStringExtra 获取字符串值并将其传递给 MediaItem，但应用程序不是运行。当我使用硬编码值时，代码工作正常，但我无法从之前的 activity.

中获取值

我的第一个 Activity :

class ButtonActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_button)
        val playbutton = findViewById<Button>(R.id.play_video)
        val videolink = "https://storage.googleapis.com/exoplayer-test-media-0/BigBuckBunny_320x180.mp4"

        playbutton.setOnClickListener {
            val intent = Intent(this,MainActivity::class.java)
            intent.putExtra("video",videolink)
            startActivity(intent)
        }
    }
}

我的第二个Activity:

class MainActivity : AppCompatActivity(){
    private var playerView: PlayerView? = null
    private var player: SimpleExoPlayer? = null
    private var playWhenReady = true
    private var currentWindow = 0
    private var playbackPosition: Long = 0
    private var flag :Boolean = false
    private val videolink = intent.getStringExtra("video")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        playerView = findViewById(R.id.video_view)
        val videolayout = findViewById<RelativeLayout>(R.id.video_layout)
        PlayerView.SHOW_BUFFERING_ALWAYS
        val btFullscreen = findViewById<ImageView>(R.id.bt_fullscreen)


        btFullscreen.setOnClickListener{
            if (flag){
                btFullscreen.setImageDrawable(resources.getDrawable(R.drawable.ic_fullscreen))
                requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
                videolayout.layoutParams.height = 300
                flag = false
            }
            else{
                btFullscreen.setImageDrawable(resources.getDrawable(R.drawable.ic_fullscreen_exit))
                requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
                flag = true
            }
        }
    }

    public override fun onStart() {
        super.onStart()
        if (Util.SDK_INT > 23) {
            initializePlayer()
        }
    }

    public override fun onResume() {
        super.onResume()
        hideSystemUi()
        if (Util.SDK_INT <= 23 || player == null) {
            initializePlayer()
        }
    }

    public override fun onPause() {
        super.onPause()
        if (Util.SDK_INT <= 23) {
            releasePlayer()
        }
    }

    public override fun onStop() {
        super.onStop()
        if (Util.SDK_INT > 23) {
            releasePlayer()
        }
    }

    private fun initializePlayer() {
        player = SimpleExoPlayer.Builder(this).build()
        playerView!!.player = player
        val mediaItem = MediaItem.fromUri(videolink!!)
        player!!.setMediaItem(mediaItem)
        player!!.playWhenReady = playWhenReady
        player!!.seekTo(currentWindow, playbackPosition)
        player!!.prepare()
        playerView!!.keepScreenOn = true
    }

    private fun releasePlayer() {
        if (player != null) {
            playbackPosition = player!!.currentPosition
            currentWindow = player!!.currentWindowIndex
            playWhenReady = player!!.playWhenReady
            player!!.release()
            player = null
        }
    }






    @SuppressLint("InlinedApi")
    private fun hideSystemUi() {
        playerView!!.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE
                // Set the content to appear under the system bars so that the
                // content doesn't resize when the system bars hide and show.
                or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                // Hide the nav bar and status bar
                or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                or View.SYSTEM_UI_FLAG_FULLSCREEN)
    }


}

Answer 1

尝试在您的 onCreate 方法中执行此操作

intent.getStringExtra("video")

Answer 2

试试这个：

class MainActivity : AppCompatActivity(){
    private var playerView: PlayerView? = null
    private var player: SimpleExoPlayer? = null
    private var playWhenReady = true
    private var currentWindow = 0
    private var playbackPosition: Long = 0
    private var flag :Boolean = false
    private var videolink = ""
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        videolink = intent.getStringExtra("video")

        playerView = findViewById(R.id.video_view)
        val videolayout = findViewById<RelativeLayout>(R.id.video_layout)
        PlayerView.SHOW_BUFFERING_ALWAYS
        val btFullscreen = findViewById<ImageView>(R.id.bt_fullscreen)


        btFullscreen.setOnClickListener{
            if (flag){
                btFullscreen.setImageDrawable(resources.getDrawable(R.drawable.ic_fullscreen))
                requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
                videolayout.layoutParams.height = 300
                flag = false
            }
            else{
                btFullscreen.setImageDrawable(resources.getDrawable(R.drawable.ic_fullscreen_exit))
                requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
                flag = true
            }
        }
    }

    public override fun onStart() {
        super.onStart()
        if (Util.SDK_INT > 23) {
            initializePlayer()
        }
    }

    public override fun onResume() {
        super.onResume()
        hideSystemUi()
        if (Util.SDK_INT <= 23 || player == null) {
            initializePlayer()
        }
    }

    public override fun onPause() {
        super.onPause()
        if (Util.SDK_INT <= 23) {
            releasePlayer()
        }
    }

    public override fun onStop() {
        super.onStop()
        if (Util.SDK_INT > 23) {
            releasePlayer()
        }
    }

    private fun initializePlayer() {
        player = SimpleExoPlayer.Builder(this).build()
        playerView!!.player = player
        val mediaItem = MediaItem.fromUri(videolink!!)
        player!!.setMediaItem(mediaItem)
        player!!.playWhenReady = playWhenReady
        player!!.seekTo(currentWindow, playbackPosition)
        player!!.prepare()
        playerView!!.keepScreenOn = true
    }

    private fun releasePlayer() {
        if (player != null) {
            playbackPosition = player!!.currentPosition
            currentWindow = player!!.currentWindowIndex
            playWhenReady = player!!.playWhenReady
            player!!.release()
            player = null
        }
    }






    @SuppressLint("InlinedApi")
    private fun hideSystemUi() {
        playerView!!.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE
                // Set the content to appear under the system bars so that the
                // content doesn't resize when the system bars hide and show.
                or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                // Hide the nav bar and status bar
                or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                or View.SYSTEM_UI_FLAG_FULLSCREEN)
    }


}

如何将视频 Link 从 activity 传递到另一个 activity？

How to pass Video Link from an activity to another activity?

android

kotlin

android-intent

exoplayer

exoplayer2.x