Xamarin Android中CrossMediaManager全屏切换功能实现求助

1. 确认基础依赖配置 #

• 先确保使用最新版的CrossMediaManager及其依赖的ExoPlayer，避免旧版本功能缺失。在Module级别的build.gradle中检查并更新依赖：

  implementation 'com.google.android.exoplayer:exoplayer:2.X.X' // 版本需与CrossMediaManager匹配
  implementation 'com.martinbonnin.crossmediamanager:crossmediamanager:X.X.X'
  

2. 自定义播放布局，添加全屏按钮 #

CrossMediaManager默认Android控件无全屏按钮，需自定义布局：

• 在res/layout下创建custom_player_layout.xml，整合ExoPlayer控件和全屏按钮：

  <?xml version="1.0" encoding="utf-8"?>
  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent">
  
      <com.google.android.exoplayer2.ui.PlayerView
          android:id="@+id/player_view"
          android:layout_width="match_parent"
          android:layout_height="match_parent" />
  
      <ImageButton
          android:id="@+id/fullscreen_btn"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_alignParentEnd="true"
          android:layout_alignParentBottom="true"
          android:layout_margin="16dp"
          android:src="@drawable/ic_fullscreen" />
  </RelativeLayout>
  

• 在Activity/Fragment中初始化控件并绑定CrossMediaManager：

  val playerView = findViewById<PlayerView>(R.id.player_view)
  val fullscreenBtn = findViewById<ImageButton>(R.id.fullscreen_btn)
  CrossMediaManager.instance.setPlayerView(playerView)
  
  // 绑定全屏按钮点击事件
  fullscreenBtn.setOnClickListener {
      toggleFullscreen()
  }
  

3. 实现全屏切换逻辑 #

• 编写toggleFullscreen()方法，处理屏幕方向、状态栏和ActionBar的切换：

  private fun toggleFullscreen() {
      val isLandscape = resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE
      if (isLandscape) {
          // 退出全屏：切回竖屏，显示状态栏和ActionBar
          requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
          supportActionBar?.show()
          window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN)
          showSystemUI()
      } else {
          // 进入全屏：切横屏，隐藏状态栏和ActionBar
          requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
          supportActionBar?.hide()
          window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN)
          hideSystemUI()
      }
  }
  

• 在AndroidManifest.xml中给目标Activity添加旋转权限配置：

  <activity
      android:name=".YourVideoActivity"
      android:configChanges="orientation|screenSize|smallestScreenSize"
      android:screenOrientation="portrait">
  </activity>
  

4. 处理生命周期与状态恢复 #

• 屏幕旋转时保存播放进度，避免重新加载：

  override fun onSaveInstanceState(outState: Bundle) {
      super.onSaveInstanceState(outState)
      val currentPos = CrossMediaManager.instance.player?.currentPosition ?: 0
      outState.putLong("PLAY_PROGRESS", currentPos)
  }
  
  override fun onRestoreInstanceState(savedInstanceState: Bundle) {
      super.onRestoreInstanceState(savedInstanceState)
      val savedPos = savedInstanceState.getLong("PLAY_PROGRESS", 0)
      CrossMediaManager.instance.player?.seekTo(savedPos)
  }
  

• 在页面销毁时释放播放资源：

  override fun onDestroy() {
      super.onDestroy()
      CrossMediaManager.instance.release()
  }
  

5. 优化全屏体验：隐藏导航栏 #

• 添加系统UI控制方法，全屏时隐藏导航栏：

  private fun hideSystemUI() {
      window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
              or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
              or View.SYSTEM_UI_FLAG_FULLSCREEN)
  }
  
  private fun showSystemUI() {
      window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_VISIBLE
  }
  

内容的提问来源于stack exchange，提问作者Echo