http://droidyue.com/blog/2020/02/09/play-audio-or-video-background-in-webview-app-android/java
問題
- 咱們使用WebView播放音樂或視頻（好比油管視頻）
- 前臺播放一直很正常，可是比較費電
- 進入後臺後就會暫停播放
- 因此需求就是咱們想要App在後臺時一樣播放音視頻
解決方法
- 重寫onWindowVisibilityChanged方法，讓網頁任然感受像是在前臺執行。
關鍵代碼
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override fun onWindowVisibilityChanged(visibility: Int) { super.onWindowVisibilityChanged(View.VISIBLE) Log.i("BackgroundMediaWebView", "onWindowVisibilityChanged " + "visibility=${toReadableVisibility(visibility)}") } |
- 當App 進入後臺（按Home鍵），visibility會變成Gone
- 咱們強制調用
super.onWindowVisibilityChanged(View.VISIBLE)會保持WebView繼續播放音視頻
完整代碼
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package com.example.webviewvisibilitychangedsample import android.content.Context import android.util.AttributeSet import android.util.Log import android.view.View import android.webkit.WebView class BackgroundMediaWebView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : WebView(context, attrs, defStyleAttr) { override fun onWindowVisibilityChanged(visibility: Int) { super.onWindowVisibilityChanged(View.VISIBLE) Log.i("BackgroundMediaWebView", "onWindowVisibilityChanged " + "visibility=${toReadableVisibility(visibility)}") } private fun toReadableVisibility(visibility: Int): String { return when(visibility) { View.VISIBLE -> "Visible" View.INVISIBLE -> "Invisible" View.GONE -> "Gone" else -> "Unknown" } } } |
完整示例項目